CESM2.1.4 CAM6.0 Namelist Definitions

Full pathname of time-variant boundary dataset for aerosol masses.
Default: set by build-namelist.

Add CAM3 prescribed aerosols to the physics buffer.
Default: FALSE

Indicates whether to use the unified chemistry tropopause method to set prescribed
stratospheric aerosols below the tropopause to zero.  This has a maximum altitude
level corresponding to 300 hPa for latitudes poleward of 50 degrees.
Default: set by build-namelist

Name of the CAM chemistry package.  N.B. this variable may not be set by
the user.  It is set by build-namelist via information in the configure
cache file to be consistent with how CAM was built.
Default: set by build-namelist

Name of the CAM physics package.  N.B. this variable may not be set by
the user.  It is set by build-namelist via information in the configure
cache file to be consistent with how CAM was built.
Default: set by build-namelist

Flag for simple physics package.  N.B. this variable may not be set by
the user.  It is set by build-namelist via information in the configure
cache file to be consistent with how CAM was built.
Default: set by build-namelist

This varible is only used internally by build-namelist to determine
appropriate defaults for climatological or transient forcing datasets.
Default: set by build-namelist.

List of aerosol species that undergo sediment (dry deposition).
Default: set by build-namelist.

Scavenging coefficient used in BULK aerosol wet removal
Default: set by build-namelist.

Below-cloud solubility factor used in BULK aerosol wet removal
Default: set by build-namelist.

In-cloud solubility factor used in BULK aerosol wet removal
Default: set by build-namelist.

List of aerosol species that undergo wet deposition.
Default: set by build-namelist.

The  cycle year of the prescribed aerosol flux data
if aerodep_flx_type  is 'CYCLICAL'.
Format: YYYY
Default: 0

Full pathname of the directory that contains the files specified in
aerodep_flx_filelist.
Default: set by build-namelist.

Filename of dataset for prescribed aerosols.
Default: set by build-namelist.

Filename of file that contains a sequence of filenames for prescribed
aerosols.  The filenames in this file are relative to the directory specified
by aerodep_flx_datapath.
Default: set by build-namelist.

The time of day (seconds) corresponding to ssaerodep_flx_fixed_ymd
at which the prescribed aerosol flux data is fixed
if saerodep_flx_type is 'FIXED'.
Default: 0 seconds

The date at which the prescribed aerosol flux data is fixed
if aerodep_flx_type is 'FIXED'.
Format: YYYYMMDD
Default: 0

Remove the file containing prescribed aerosol deposition fluxes from local disk when no longer needed.
Default: FALSE

Names of variables containing aerosol data in the prescribed aerosol datasets.
Default: none

Type of time interpolation for data in aerodep_flx files.
Can be set to 'CYCLICAL', 'SERIAL', 'INTERP_MISSING_MONTHS', or 'FIXED'.
Default: 'SERIAL'

Full pathname of the ac_CO2 file specified in the filelist in
aircraft_specifier.  This is only to
get this name into the cam.input_data_list for the CESM scripts.
Default: set by build-namelist.

Full pathname of the directory that contains the files specified in
aircraft_specifier.
Default: set by build-namelist.

Filename of file that contains aircraft input file lists. The filenames in the files are relative
to the directory specified by aircraft_datapath.
Default: set by build-namelist.

Type of time interpolation for data in aircraft aerosol files.
Default: 'CYCLICAL_LIST'

Full pathname of boundary dataset for airplane emissions.
Default: set by build-namelist.

Scavenging coefficient used in the wet removal of CB2
Default: set by build-namelist.

Below-cloud solubility factor used in CB2 wet removal
Default: set by build-namelist.

In-cloud solubility factor used in CB2 wet removal
Default: set by build-namelist.

Frequency in time steps at which the chemical equations are solved.
Default: 1

Flag to set rad_climate variable so that the chemical tracers are
radiatively passive.
Default: FALSE

Filename of dataset for linoz cholirine loading.
Default: none.

The time of day (seconds) corresponding to chlorine_loading_fixed_ymd
at which the chlorine loading data is fixed
if chlorine_loading_type is 'FIXED'.
Default: 0 seconds

The date at which the chlorine loading data is fixed
if chlorine_loading_type is 'FIXED'.
Format: YYYYMMDD
Default: 0

Type of time interpolation type for data in  chlorine_loading_file
Default: 'SERIAL'

Full pathname of dataset containing soil moisture fraction information used in 'xactive_atm'
method of calculating dry deposition of chemical tracers.
Default: set by build-namelist.

Full pathname of dataset which contains the prescribed deposition velocities used
in the 'table' method of calculating dry deposition  of chemical tracers.
Default: set by build-namelist.

Full pathname of dataset which contains land vegitation information used in 'xactive_atm'
method of calculating dry deposition of chemical tracers.
Default: set by build-namelist.

Dry deposition surface values interpolated to model grid, required for unstructured atmospheric grids
with modal chemistry.
Default: none

Scavenging coefficient used in the wet removal of DST01
Default: set by build-namelist.

Scavenging coefficient used in the wet removal of DST02
Default: set by build-namelist.

Scavenging coefficient used in the wet removal of DST03
Default: set by build-namelist.

Scavenging coefficient used in the wet removal of DST04
Default: set by build-namelist.

Tuning parameter for dust emissions.
Default: set by build-namelist.

Below-cloud solubility factor used in wet removal of BULK dust
Default: set by build-namelist.

In-cloud solubility factor used in wet removal of BULK dust
Default: set by build-namelist.

Full pathname of dataset of O2 and 03 column densities above the model for look-up-table photolysis
Default: set by build-namelist.

The  cycle year of the external forcings (3D emissions) data
if ext_frc_type  is 'CYCLICAL'.
Format: YYYY
Default: 0

The time of day (seconds) corresponding to ext_frc_fixed_ymd
at which the external forcings are fixed
if ext_frc_type is 'FIXED'.
Default: 0 seconds

Default: current model date
The date at which the external forcings are fixed
if ext_frc_type is 'FIXED'.
Format: YYYYMMDD
Default: 0

List of full pathnames of elevated emission (or external chemical forcings) datasets.

The chemistry package reads in elevated emission data from a set of netcdf files in
units of "molecules/cm3/s".  Each tracer species emissions is read from its
own file as directed by the namelist variable ext_frc_specifier.  The
ext_frc_specifier variable tells the model which species have elevated
emissions and the file path for the corresponding species.  That is, the
ext_frc_specifier variable is set something like:

 ext_frc_specifier = 'SO2 -> /path/vrt.emis.so2.nc',
                     'SO4 -> /path/vrt.emis.so4.nc', etc...

Each emission file can have more than one source.  When the emission are
read in the sources are summed to give a total emission field for the
corresponding species.  The emission can be read in as time series of data,
cycle over a given year, or be fixed to a given date.

The vertical coordinate in these emissions files should be 'altitude' (km) so that the
vertical redistribution to the model layers is done using a mass conserving method.
If the vertical coordinate is altitude then data needs to be ordered from the
surface to the top (increasing altitude).

Default: set by build-namelist.

Type of time interpolation for fixed lower boundary data.
Can be set to 'CYCLICAL', 'SERIAL', 'INTERP_MISSING_MONTHS', or 'FIXED'.
Default: 'CYCLICAL'

The cycle year of the fixed lower boundary data
if flbc_type  is 'CYCLICAL'.
Format: YYYY
Default: 0

Full pathname of dataset for fixed lower boundary conditions.
Default: set by build-namelist.

The time of day (seconds) corresponding to flbc_fixed_ymd
at which the fixed lower boundary data is fixed
if flbc_type is 'FIXED'.
Default: 0 seconds

The date at which the fixed lower boundary data is fixed
if flbc_type is 'FIXED'..
Format: YYYYMMDD
Default: 0

List of species that are fixed at the lower boundary.
Default: set by build-namelist.

Type of time interpolation for fixed lower boundary data.
Default: 'CYCLICAL'

Full pathname of dataset for chemical tracers constrained  in the stratosphere
Default: set by build-namelist.

List of species that are constrained in the stratosphere.
Default: set by build-namelist.

List of gas-phase species that undergo wet deposition via the wet deposition scheme.
Default: NONE

Wet deposition method used
  MOZ --> mozart scheme is used
  NEU --> J Neu's scheme is used
  OFF --> wet deposition is turned off
Default: NEU except for SPCAM runs

The  cycle year of the prescribed green house gas data
if gcr_ionization_type  is 'CYCLICAL'.
Format: YYYY
Default: 0

Full pathname of the directory that contains the files specified in
gcr_ionization_filelist.
Default: set by build-namelist.

Type of time interpolation for data in gcr_ionization files.
Can be set to 'CYCLICAL', 'SERIAL', 'INTERP_MISSING_MONTHS', or 'FIXED'.
Default: 'SERIAL'

Filename of file that contains a sequence of filenames for ionization
rates by galactic cosmic rays.  The filenames in this file are relative
to the directory specified by gcr_ionization_datapath.
Default: set by build-namelist.

Filename of dataset for ionization rates by galactic cosmic rays.
Default: set by build-namelist.

The time of day (seconds) corresponding to gcr_ionization_fixed_ymd
at which the prescribed green house gas data is fixed
if gcr_ionization_type is 'FIXED'.
Default: 0 seconds

The date at which the prescribed green house gas data  is fixed
if gcr_ionization_type is 'FIXED'.
Format: YYYYMMDD
Default: 0

Names of variables containing ionization rates (/cm3/sec) in the cosmic rays datasets.
Default: none

Flag to tell build-namelist to use time-dependent external forcing
files for the aircraft emissions.
Default: FALSE

Full pathname of dataset for land mask applied to the lighting NOx production
Default: set by build-namelist.

Multiplication factor  applied to the lighting NOx production
Default: 1.0.

The  cycle year of the LINOZ data
if linoz_data_type is 'CYCLICAL'.
Format: YYYY
Default: 0

Filename of dataset for LINOZ data.
Default: none.

Filename of file that contains a sequence of filenames of the linoz data.
The filenames in this file are relative to the directory specified
by linoz_data_datapath.
Default: set by build-namelist.

The time of day (seconds) corresponding to linoz_data_fixed_ymd
at which the LINOZ data is fixed
if linoz_data_type is 'FIXED'.
Default: 0 seconds

The date at which the LINOZ data  is fixed
if linoz_data_type is 'FIXED'.
Format: YYYYMMDD
Default: 0

Full pathname of the directory that contains the files specified in
linoz_data_filelist.
Default: none.

Remove the file containing LINOZ data from local disk when no longer needed.
Default: FALSE

Type of time interpolation for data in linoz_data files.
Can be set to 'CYCLICAL', 'SERIAL', 'INTERP_MISSING_MONTHS', or 'FIXED'.
Default: 'SERIAL'

Give the user the ability to specify species families (or groupings) diagnostics in mass mixing ratio.
These group names can be added to history fincl variables. The units are kg/kg.
A "+" character at the end of a string indicates that the summation will continue with the next string.
Example:
 mmr_sums =
    'soa_a1 = soa1_a1 + soa2_a1 + soa3_a1 + soa4_a1 + soa5_a1',
    'soa_a2 = soa1_a2 + soa2_a2 + soa3_a2 + soa4_a2 + soa5_a2'
 fincl1 = 'soa_a1','soa_a2', ...
Default: none

Turns on accumulation to coarse mode exchange appropriate for the stratosphere.
This also changes the default mode definitions (widths and edges) via default
aerosol property input files.
Default: FALSE

Turns on prognostic modal sulfate aerosols in the stratosphere.
Default: FALSE

Scavenging coefficient used in the wet removal of NH4
Default: set by build-namelist.

Below-cloud solubility factor used in NH4 wet removal
Default: set by build-namelist.

In-cloud solubility factor used in NH4 wet removal
Default: set by build-namelist.

Below-cloud solubility factor used in NH4NO3 wet removal
Default: set by build-namelist.

In-cloud solubility factor used in NH4NO3 wet removal
Default: set by build-namelist.

The cycle year of the NOy upper boundary data
if flbc_type  is 'CYCLICAL'.
Format: YYYY
Default: 0

Full pathname of the directory that contains the NOy upper boundary conditions files specified in
noy_ubc_filelist.
Default: set by build-namelist.

Type of time interpolation for NOy upper boundary conditions.
Default: 'SERIAL'

Filename of file that contains a sequence of filenames for prescribed NOy upper boundary conditions.
The filenames in this file are relative to the directory specified by noy_ubc_datapath.
Default: set by build-namelist.

File name of dataset for NOy upper boundary conditions.
Default: set by build-namelist.

The time of day (seconds) corresponding to noy_ubc_fixed_ymd
at which the NOy upper boundary data is fixed
if flbc_type is 'FIXED'.
Default: 0 seconds

The date at which the NOy upper boundary data is fixed
if flbc_type is 'FIXED'..
Format: YYYYMMDD
Default: 0

Full pathname of dataset of O2 cross sections for fast-tuv photolysis
Default: set by build-namelist.

Scavenging coefficient used in the wet removal of OC2
Default: set by build-namelist.

Below-cloud solubility factor used in OC2 wet removal
Default: set by build-namelist.

In-cloud solubility factor used in OC2 wet removal
Default: set by build-namelist.

The  cycle year of the prescribed aerosol data
if prescribed_aero_type  is 'CYCLICAL'.
Format: YYYY
Default: 0

Full pathname of the directory that contains the files specified in
prescribed_aero_filelist.
Default: set by build-namelist.

Filename of dataset for prescribed aerosols.
Default: set by build-namelist.

Filename of file that contains a sequence of filenames for prescribed
aerosols.  The filenames in this file are relative to the directory specified
by prescribed_aero_datapath.
Default: set by build-namelist.

The time of day (seconds) corresponding to prescribed_aero_fixed_ymd
at which the prescribed aerosol data is fixed
if prescribed_aero_type is 'FIXED'.
Default: 0 seconds

The date at which the prescribed aerosol data is fixed
if prescribed_aero_type is 'FIXED'.
Format: YYYYMMDD
Default: 0

Switch used to indicate which type of aerosols are prescribed -- bulk or modal.
This is used to set the default prescribed_aero_specifier and
aerodep_flx_specifier namelist variables.
Default: set by build-namelist

Remove the file containing prescribed aerosol concentrations from local disk when no longer needed.
Default: FALSE

A list of variable names of the concentration fields in the prescribed aerosol datasets
and corresponding names used in the physics buffer seperated by colons.  For example:

 prescribed_aero_specifier = 'pbuf_name1:ncdf_fld_name1','pbuf_name2:ncdf_fld_name2', ...

If there is no colon seperater then the specified name is used as both the pbuf_name and ncdf_fld_name,

Default: none

Type of time interpolation for data in prescribed_aero files.
Can be set to 'CYCLICAL', 'SERIAL', 'INTERP_MISSING_MONTHS', or 'FIXED'.
Default: 'SERIAL'

The  cycle year of the prescribed green house gas data
if prescribed_ghg_type  is 'CYCLICAL'.
Format: YYYY
Default: 0

Full pathname of the directory that contains the files specified in
prescribed_ghg_filelist.
Default: set by build-namelist.

Filename of dataset for prescribed GHGs.
Default: set by build-namelist.

Filename of file that contains a sequence of filenames for prescribed
GHGs.  The filenames in this file are relative to the directory specified
by prescribed_ghg_datapath.
Default: set by build-namelist.

The time of day (seconds) corresponding to prescribed_ghg_fixed_ymd
at which the prescribed green house gas data is fixed
if prescribed_ghg_type is 'FIXED'.
Default: 0 seconds

The date at which the prescribed green house gas data  is fixed
if prescribed_ghg_type is 'FIXED'.
Format: YYYYMMDD
Default: 0

Remove the file containing prescribed green house gas concentrations from local disk when no longer needed.
Default: FALSE

Names of variables containing GHG data in the prescribed GHG datasets.
Default: none

Type of time interpolation for data in prescribed_ghg files.
Can be set to 'CYCLICAL', 'SERIAL', 'INTERP_MISSING_MONTHS', or 'FIXED'.
Default: 'SERIAL'

The  cycle year of the prescribed ozone data
if prescribed_ozone_type  is 'CYCLICAL'.
Format: YYYY
Default: 0

Full pathname of the directory that contains the files specified in
prescribed_ozone_filelist.
Default: set by build-namelist.

Filename of dataset for prescribed ozone.
Default: set by build-namelist.

Filename of file that contains a sequence of filenames for prescribed
ozone.  The filenames in this file are relative to the directory specified
by prescribed_ozone_datapath.
Default: set by build-namelist.

The time of day (seconds) corresponding to prescribed_ozone_fixed_ymd
at which the prescribed ozone data is fixed
if prescribed_ozone_type is 'FIXED'.
Default: 0 seconds

The date at which the prescribed ozone data is fixed
if prescribed_ozone_type is 'FIXED'.
Format: YYYYMMDD
Default: 0

Name of variable containing ozone data in the prescribed ozone datasets.
Default: 'ozone'

Remove the file containing prescribed ozone concentrations from local disk when no longer needed.
Default: FALSE

Type of time interpolation for data in prescribed_ozone files.
Can be set to 'CYCLICAL', 'SERIAL', 'INTERP_MISSING_MONTHS', or 'FIXED'.
Default: 'SERIAL'

If true the prescribed stratospheric aerosols have three distribution modes.
Default: true for CAM6, otherwise false

The  cycle year of the prescribed volcanic aerosol data
if prescribed_strataero_type  is 'CYCLICAL'.
Format: YYYY
Default: 0

Full pathname of the directory that contains the files specified in
prescribed_strataero_filelist.
Default: set by build-namelist.

Switch to turn on climate feed backs due to prescribed stratospheric aerosols via
the rad_climate namelist variable.
Default: false

Filename of dataset for prescribed volcaero.
Default: set by build-namelist.

Filename of file that contains a sequence of filenames for prescribed
stratospheric aerosols.  The filenames in this file are relative to the directory specified
by prescribed_strataero_datapath.
Default: set by build-namelist.

The time of day (seconds) corresponding to prescribed_strataero_fixed_ymd
at which the prescribed volcanic aerosol data is fixed
if prescribed_strataero_type is 'FIXED'.
Default: 0 seconds

The date at which the prescribed volcanic aerosol data  is fixed
if prescribed_strataero_type is 'FIXED'.
Format: YYYYMMDD
Default: 0

Remove the file containing prescribed volcanic aerosol concentrations from local disk when no longer needed.
Default: FALSE

Name of variable containing prescribed stratospheric aerosol specifiers
Default: set by the CAM program

Type of time interpolation for data in prescribed_strataero files.
Can be set to 'CYCLICAL', 'SERIAL', 'INTERP_MISSING_MONTHS', or 'FIXED'.
Default: 'SERIAL'

The  cycle year of the prescribed volcanic aerosol data
if prescribed_volcaero_type  is 'CYCLICAL'.
Format: YYYY
Default: 0

Full pathname of the directory that contains the files specified in
prescribed_volcaero_filelist.
Default: set by build-namelist.

Filename of dataset for prescribed volcaero.
Default: set by build-namelist.

Filename of file that contains a sequence of filenames for prescribed
volcanic aerosols.  The filenames in this file are relative to the directory specified
by prescribed_volcaero_datapath.
Default: set by build-namelist.

The time of day (seconds) corresponding to prescribed_volcaero_fixed_ymd
at which the prescribed volcanic aerosol data is fixed
if prescribed_volcaero_type is 'FIXED'.
Default: 0 seconds

The date at which the prescribed volcanic aerosol data  is fixed
if prescribed_volcaero_type is 'FIXED'.
Format: YYYYMMDD
Default: 0

Name of variable containing volcaero data in the prescribed volcaero datasets.
Default: 'MMRVOLC'

Remove the file containing prescribed volcanic aerosol concentrations from local disk when no longer needed.
Default: FALSE

Type of time interpolation for data in prescribed_volcaero files.
Can be set to 'CYCLICAL', 'SERIAL', 'INTERP_MISSING_MONTHS', or 'FIXED'.
Default: 'SERIAL'

Full pathname of dataset for radiative source function used in look up table photloysis
Default: set by build-namelist.

Give the user the ability to specify rate families (or groupings) diagnostics based
on reaction tag names. These group names can be added to history fincl variables.
A "+" character at the end of a string indicates that the summation will continue with the next string.
Example:
 rate_sums =
   'OX_P = NO_HO2 + CH3O2_NO + 2*jo2_b ... ',
   'OX_L = NO2_O_M + HO2_O3 + CLO_O ...',
   'RO2_RO2_sum = CH3O2_CH3O2a + CH3O2_CH3O2b + C2H5O2_CH3O2 + C2H5O2_C2H5O2 + CH3CO3_CH3O2 +',
               'CH3CO3_CH3CO3 + CH3H7O2_CH3O2 + RO2_CH3O2 + MACRO2_CH3O2 ...',
 fincl1 = 'OX_P','OX_L', 'RO2_RO2_sum', ...
Default: none

Tuning for seasalt_emis
Default: set by build-namelist.

Full pathname of dataset which contains season information used in 'xactive_atm'
method of calculating dry deposition of chemical tracers.
Default: set by build-namelist.

Scavenging coefficient used in the wet removal of SO4
Default: set by build-namelist.

Below-cloud solubility factor used in SO4 wet removal
Default: set by build-namelist.

In-cloud solubility factor used in SO4 wet removal
Default: set by build-namelist.

Full pathname of boundary dataset for soil erodibility factors.
Default: set by build-namelist.

Tuning for below cloud scavenging of interstitial modal aerosols.
Default: set by build-namelist.

Tuning for in-cloud scavenging of cloud-borne modal aerosols.
Default: set by build-namelist.

Tuning for in-cloud scavenging of interstitial modal aerosols.
Default: set by build-namelist.

The  cycle year of the surface emissions data
if srf_emis_type  is 'CYCLICAL'.
Format: YYYY
Default: 0

The time of day (seconds) corresponding to srf_emis_fixed_ymd
at which the surface emissions are fixed
if srf_emis_type is 'FIXED'.
Default: 0 seconds

The date at which the surface emissions are fixed
if srf_emis_type is 'FIXED'.
Format: YYYYMMDD
Default: 0

List of full pathnames of surface emission datasets.

The chemistry package reads in emission data from a set of netcdf files in
units of "molecules/cm2/s".  Each tracer species emissions is read from its
own file as directed by the namelist variable srf_emis_specifier.  The
srf_emis_specifier variable tells the model which species have emissions
and the file path for the corresponding species.  That is, the
srf_emis_specifier variable is set something like:

 srf_emis_specifier = 'CH4 -> /path/emis.ch4.nc',
                      'CO  -> /path/emis.co.nc', etc...

Each emission file can have more than one source.  When the emission are
read in the sources are summed to give a total emission field for the
corresponding species.  The emission can be read in as time series of data,
cycle over a given year, or be fixed to a given date.

Default: set by build-namelist.

Type of time interpolation of emission datasets specified.
Can be set to 'CYCLICAL', 'SERIAL', 'INTERP_MISSING_MONTHS', or 'FIXED'.
by srf_emis_specifier.
Default: 'CYCLICAL'

Scavenging coefficient used in the wet removal of SSLT01
Default: set by build-namelist.

Scavenging coefficient used in the wet removal of SSLT02
Default: set by build-namelist.

Scavenging coefficient used in the wet removal of SSLT03
Default: set by build-namelist.

Scavenging coefficient used in the wet removal of SSLT04
Default: set by build-namelist.

Below-cloud solubility factor used in wet removal of BULK sea salt
Default: set by build-namelist.

In-cloud solubility factor used in wet removal of BULK sea salt
Default: set by build-namelist.

The  cycle year of the prescribed sulfate data
if sulf_type  is 'CYCLICAL'.
Format: YYYY
Default: 0

Full pathname of the directory that contains the files specified in
sulf_filelist.
Default: set by build-namelist.

Full pathname of dataset containing tropopheric sulfate aerosols
Default: set by build-namelist.

Filename of file that contains a sequence of filenames for prescribed
sulfate.  The filenames in this file are relative to the directory specified
by sulf_datapath.
Default: set by build-namelist.

The time of day (seconds) corresponding to sulf_fixed_ymd
at which the prescribed sulfate data is fixed
if sulf_type is 'FIXED'.
Default: 0 seconds

The date at which the prescribed sulfate data is fixed
if sulf_type is 'FIXED'.
Format: YYYYMMDD
Default: 0

Name of variable containing sulfate data in the prescribed sulfate datasets.
Default: 'SULFATE'

Remove the file containing prescribed sulfate concentrations from local disk when no longer needed.
Default: FALSE

Type of time interpolation for data in prescribed sulfate files.
Can be set to 'CYCLICAL', 'SERIAL', 'INTERP_MISSING_MONTHS', or 'FIXED'.
Default: 'CYCLICAL'

The  cycle year of the prescribed chemical constituents data
if tracer_cnst_type  is 'CYCLICAL'.
Format: YYYY
Default: 0

Full pathname of the directory that contains the files specified in
tracer_cnst_filelist.
Default: set by build-namelist.

Filename of dataset for the prescribed chemical constituents.
Default: set by build-namelist.

Filename of file that contains a sequence of filenames for the prescribed chemical constituents.
The filenames in this file are relative to the directory specified
by tracer_cnst_datapath.
Default: set by build-namelist.

The time of day (seconds) corresponding to tracer_cnst_fixed_ymd
at which the chemical constituents data is fixed
if tracer_cnst_type is 'FIXED'.
Default: 0 seconds

The date at which the chemical constituents data is fixed
if tracer_cnst_type is 'FIXED'.
Format: YYYYMMDD
Default: 0

Remove the file containing prescribed chemical constituents from local disk when no longer needed.
Default: FALSE

List of prescribed chemical constituents.
Default: set by build-namelist.

Type of time interpolation for data in tracer_cnst files.
Default: 'SERIAL'

The  cycle year of the prescribed chemical sources data
if tracer_srcs_type  is 'CYCLICAL'.
Format: YYYY
Default: 0

Full pathname of the directory that contains the files specified in
tracer_srcs_filelist.
Default: set by build-namelist.

Filename of dataset for the prescribed chemical sources.
Default: set by build-namelist.

Filename of file that contains a sequence of datasets for the prescribed chemical sources.
The filenames in this file are relative to the directory specified
by tracer_srcs_datapath.
Default: set by build-namelist.

The time of day (seconds) corresponding to tracer_srcs_fixed_ymd
at which the chemical sources data is fixed
if tracer_srcs_type is 'FIXED'.
Default: 0 seconds

The date at which the chemical sources data is fixed
if tracer_srcs_type is 'FIXED'.
Format: YYYYMMDD
Default: 0

Remove the file containing prescribed chemical sources from local disk when no longer needed.
Default: FALSE

List of prescribed chemical sources
Default: set by build-namelist.

Type of time interpolation for data in tracer_srcs files.
Default: 'SERIAL'

Full pathname of dataset for fast-tuv photolysis cross sections
Default: set by build-namelist.

Give the user the ability to specify species families (or groupings) diagnostics in volume mixing ratio.
These group names can be added to history fincl variables.  The units are mole/mole.
A "+" character at the end of a string indicates that the summation will continue with the next string.
Example:
 vmr_sums =
   'SOAG = SOAG0 + SOAG1 + SOAG2 + SOAG3 + SOAG4',
   'NOy = N + NO + NO2 + NO3 + 2*N2O5 + HNO3 + HO2NO2 + CLONO2 +',
       'BRONO2 + PAN + MPAN + ISOPNO3 + ONITR +',
       'HONITR + ALKNIT + ISOPNITA + ISOPNITB + ISOPNOOH + NC4CH2OH +',
       'NC4CHO + NOA + NTERPOOH + PBZNIT + TERPNIT'
 fincl1 = 'NOy','SOAG', ...
Default: none

If TRUE then use the FTUV method to calculate the photolysis reactions rates,
otherwise use the look up table method.
Default: FALSE

Full pathname of dataset for  Chebyshev polynomial Coeff data used for photolysis
cross sections.
Default: set by build-namelist.

Full pathname of cross section dataset for long wavelengh photolysis
Default: set by build-namelist.

Full pathname of cross section dataset for short wavelengh photolysis
Default: set by build-namelist.

A fraction that scales how tight the convergence criteria are to
determine that the substepping has resulted in a valid solution.
Smaller values will force more substepping.
CARMA particles.
Default: 0.1

Accommodation coefficient for coagulation.
Default: 1.0

Flag indicating that the CARMA model is an aerosol model, and
should be called in tphysac.
Default: TRUE

Flag indicating that CARMA is a cloud ice model and should
be called in tphysbc.
Default: FALSE

Flag indicating that CARMA is a cloud liquid model and should
be called in tphysbc.
Default: FALSE

Flag indicating that CARMA should do clear sky calculations for
particles that are not part of a cloud in addition to doing a
separate calculation for incloud particles. Only valid when
carma_do_incloud is true.
Default: FALSE

Flag indicating whether the coagulation process is enabled for
CARMA particles.
Default: FALSE

Flag indicating that CARMA is responsible for detrain condensate
from convection into the model.
Default: FALSE

Flag indicating that the dry deposition process is enabled for
CARMA particles.
Default: FALSE

Flag indicating that the emission of particles is enabled for
CARMA.
Default: FALSE

Flag indicating that sedimentation should be calculated using an
explicit technique where the substepping is used to keep the CFL
condition from being violated rather than the default PPM scheme.
Default: FALSE

Flag indicating CARMA coefficients should only be initialized once from
a fixed temperature profile rather than recomputed for each column. This
improves performance, but reduces accuracy. By default the temperature
profile used is calculated as the average of the initial condition file,
but a predefined profile can be provided.
Default: FALSE

Flag indicating that the condensational growth process is enabled for
CARMA particles.
Default: FALSE

Flag indicating that CARMA should treat cloud particles as incloud
rather than gridbox average calculations.
Default: FALSE

Flag indicating that carma should generate optical properties files
for the CAM radiation code.
Default: FALSE

Flag indicating used in cunjunction with carma_do_fixedinit to indicate
that only the coagulation coefficients should only be initialized from
a fixed temperature profile and all other coeeficients will be recalculated.
Coagulation is the slowest initialization, so this improves performance while
still retaining accuracy for most processes.
Default: FALSE

Flag indicating that particle heating will be used for the condensational
growth process.
Default: FALSE

Flag indicating that particle heating will affect the atmospheric
temperature.
Default: FALSE

Flag indicating that substepping will be used for the condensational
growth process.
Default: FALSE

Flag indicating that changes in heating will be calculated as a result
CARMA processes and will affect the CAM heating tendency.
Default: FALSE

Flag indicating that the effect of Brownian diffusion will be calculated for
CARMA particles. NOTE: This needs to be used in conjunction with CARMA
sedimentation.
Default: FALSE

Flag indicating that the sedimentation process is enabled for
CARMA particles.
Default: FALSE

Flag indicating that the wet deposition process is enabled for
CARMA particles.
Default: FALSE

When non-zero, the largest change in temperature (K)
allowed per substep.
Default: 0.

Flag indicating whether CARMA is enabled. If CARMA has been included
in the build (configure -carma with something other than none), then
this will cause all of the CARMA constituents and field names to be
registered, but no other CARMA process will be preformed. This overrides
the individual CARMA process flags.
Default: FALSE

Accommodation coefficient for growth with ice.
Default: 0.93

Accommodation coefficient for growth with liquid.
Default: 1.0

Flag indicating that CARMA sulfate surface area density will be used
in heterogeneous chemistry rate calculation.
Default: FALSE

Specifies the maximum number of retry attempts to be used when
condensational growth requires substepping, but the original estimate
for the amount of substepping was insufficient.
Default: 8

Specifies the maximum number of substeps that could be used for the
first guess when condensational growth requires substepping.
Default: 1

The name of the active CARMA microphysics model or none when CARMA
is not active.
Default: none

Flag indicating that CARMA sulfate mass mixing ratio will be used
in radiation calculation.
Default: FALSE

Specifies the name of the reference temperature file that will be
used (and created if necessary)  for initialization of CARMA to a
fixed temperature profile.
Default: carma_reft.nc

Critical relative humidity for liquid cloud formation, used
for sub-grid scale in-cloud saturation.
Default: 1.0

Accommodation coefficient for temperature.
Default: 1.0

Flag indicating that meteor smoke emission will be scaled by a
global relative flux based upon the carma_escale_file.
Default: FALSE

Flag indicating that a calculated Weibull K should be used.
Default: FALSE

Global mass of dust emission for the event.
Default: 0. (kg)

Specifies the name of the file containing the meteor smoke emission
(ablation) profile.
Default: set by build-namelist.

Maximum latitude of the area for emssions from the event.
Default: 90. (degrees north)

Maximum longitude of the area for emssions from the event.
Default: 360. (degrees east)

Minimum latitude of the area for emssions from the event.
Default: -90. (degrees north)

Minimum longitude of the area for emssions from the event.
Default: 0. (degrees east)

Global mass of dust emission for the event.
Default: 0. (kg)

Starting date for emissions in the form of (yyyyddd) where yyyy is a year and
ddd is a day of year.
Default: 1 (yyyyddd)

Starting time for the emission event in GMT.
Default: 0. (s Z)

Stopping date for emissions in the form of (yyyyddd) where yyyy is a year and
ddd is a day of year.
Default: 1 (yyyyddd)

Stoping time for the emission event in GMT.
Default: 0. (s)

The total meteor smoke emission rate in kt/year. The flux will be
scaled to total that value.
Default: 16.0

The emission rate of inert tracers used in the test. A positive value indicates that
the rate is a column mass (kg/m2/s) and a negative value indicate that it is a mass
mixing ratio (kg/kg/s).
Default: 1e-9

Specifies the name of the file containing the global realtive flux
specification.
Default: set by build-namelist.

Are the soot particles treated as fractals?
Default: FALSE

Specifies the day of year when tracers will start being emitted for the tracer test.
Default: 1

Specifies the name of the file containing ice refrative indicies as a function of wavelength
used for the particle heating calculation.
Default: set by build-namelist.

Flag indicating that h2so4 vapor pressures should be calculated as if they were
over sulfates that have been totally neutralized.
Default: FALSE

Specifies the name of the sea salt emission parameterization.
Default: Gong

Specifies the name of the file containing soil erosion factors. This is used by
the dust model.
Default: set by build-namelist.

Specifies the method to use to get the prescribed sulfate aerosols for use with nucleation
of cirrus clouds. This can be different than the sulfate aerosols that are used with the
climate.
Default: fixed

Indicates whether to use the unified chemistry tropopause method to set the
tropopause used in gas phase and aerosol chemical processes.  This has a maximum altitude
level corresponding to 300 hPa for latitudes poleward of 50 degrees.
Default: set by build-namelist

parameter for deep convection cloud fraction.
Default: set by build-namelist

parameter for deep convection cloud fraction.
Default: set by build-namelist

Switch for Vavrus "freeze dry" adjustment in cloud fraction.  Set to FALSE to
turn the adjustment off.
Default: .true.

Switch for ice cloud fraction calculation.
Default: .true. for CAM5 and CAM6, otherwise .false.

top pressure bound for mid level cloud.
Default: set by build-namelist

Minimum rh for high stable clouds.
Default: set by build-namelist

Minimum rh for low stable clouds.
Default: set by build-namelist

parameter for shallow convection cloud fraction.
Default: set by build-namelist

parameter for shallow convection cloud fraction.
Default: set by build-namelist

Factor applied to the ice fall velocity computed from
Stokes terminal velocity.
Default: set by build-namelist

Flag to set rad_climate variable so that the prognostic CO2 controlled by
the co2_cycle module is radiatively passive.
Default: FALSE

If TRUE turn on CO2 code.
Default: set by build-namelist

If TRUE read co2 aircraft flux from file.
Default: set by build-namelist

If TRUE read co2 fuel flux from file.
Default: set by build-namelist

If TRUE read co2 ocn flux from file.
Default: FALSE

Filepath for dataset containing CO2 flux from fossil fuel.
Default: none

Filepath for dataset containing CO2 flux from ocn.
Default: none

Number of macrophysics/microphysics substeps.
Default: 1

Use cloud fraction to determine whether to do growth of ice clouds below
RHice of 1 down to RHice = rhmini.
Default: .true. for CAM6; all others => .false.

rhi at which ice cloud fraction = 1.
Default: set by build-namelist

rhi at which ice cloud fraction = 1 in the stratosphere.
Default: set by build-namelist

Minimum rh for ice cloud fraction > 0.
Default: set by build-namelist

Minimum rh for ice cloud fraction > 0 in the stratosphere.
Default: set by build-namelist

Critical RH for ice clouds (Wilson & Ballard scheme).
Default: set by build-namelist

Scheme for ice cloud fraction: 1=wang & sassen, 2=schiller (iciwc),
3=wood & field, 4=Wilson (based on smith), 5=modified slingo (ssat & empyt cloud)
Default: set by build-namelist

Bottom height (Pa) for mid-level liquid stratus fraction.
Default: 700.e2 for CAM5 and CAM6; all others=> 750.e2

Adjustment to rhminl for land without snow cover.
Default: 0.0 for CAM6;
         all others => 0.10

Apply adjustments to dry static energy so that CLUBB conserves
energy.
Default: true

Apply liquid supersaturation adjustment code
Default: false

Switch to use new convective scavenging for modal aerosols.  This scheme
replaces the call to ZM's convtran for the the modal aerosol number and
mass mixing ratio constituents.
Default: .false.

Type of deep convection scheme employed.  'ZM' for Zhang-McFarlane;
'off' for none; or 'UNICON' which doesn't distinquish shallow and deep.
Default: 'ZM' unless using 'UNICON', 'SPCAM' or 'pbl=none'

Switch for CLUBB_SGS
Default: set by build-namelist

Rain water autoconversion coefficient for Hack shallow scheme.
Default: set by build-namelist

Characteristic adjustment time scale for Hack shallow scheme.
Default: 1800.0

Switch to control whether Park macrophysics should prognose
cloud ice (cldice).
Default: .true., except for carma=cirrus and carma=carma_dust

Switch to control whether Park macrophysics should prognose
cloud liquid (cldliq).
Default: .true.

Switch to control whether Park macrophysics should perform
detrainment into the stratiform cloud scheme.
Default: .true., except for carma=cirrus and carma=carma_dust

Type of macrophysics scheme employed.  'park' for Park
(1998); 'RK' for Rasch and Kristjansson (1998); 'CLUBB_SGS' clubb.
Default: set by build-namelist

Type of microphysics scheme employed.  'RK' for Rasch and Kristjansson
(1998); 'MG' for Morrison and Gettelman (2008), Gettelman et al (2010)
two moment scheme for CAM5 and CAM6
SPCAM has two different microphysics schemes: SPCAM_m2005 (Morrison et al 2005),
SPCAM_sam1mom (Khairoutinov 2003)
Default: set by build-namelist (depends on value set in configure).

Tunable constant for evaporation of precip in RK microphysics scheme.
Default: set by build-namelist

Threshold for autoconversion of cold ice in RK microphysics scheme.
Default: set by build-namelist

Threshold for autoconversion of warm ice in RK microphysics scheme.
Default: set by build-namelist

Relative humidity threshold for stratospheric cloud water condensation in RK microphysics
poleward of 50 degrees.
Default: none

Critical radius at which autoconversion become efficient in RK microphysics
scheme.
Default: set by build-namelist

Type of shallow convection scheme employed.
 'Hack' for Hack shallow convection;
 'UW' for original McCaa UW pbl scheme, modified by Sungsu Park;
 'CLUBB_SGS' for CLUBB_SGS
 'UNICON' which doesn't distinquish shallow and deep.
 'SPCAM_m2005' for SPCAM double moment
 'SPCAM_sam1mom' for SPCAM single moment
Default: set by build-namelist (depends on eddy_scheme).

Type of sub-column generator scheme employed.
   'SIHLS'    Sub-columns generated with Latin Hypercube sampling of the CLUBB PDF;
   'CloudObj' Create sub-columns where most water is assigned to cloud sub-columns;
   'tstcp'    testing;
   'vamp'     Variation Across Microphysics Profiles simple deterministic scheme;
   'off'      None
Default: 'off'

Number of subcolumns/samples to use in this simulation. Must be less than psubcols.
Default: 4

Turns on/off use of weights during averaging in tstcp
'true' to use weights.
Default: '.true.'

Turns on/off filtering during averaing in tstcp
'true' to use filtering.
Default: '.false.'

Turns off averaging and assigns first subcolumn back to grid.  Needed for BFB comparisons
'true' for no averaging.
Default: '.false.'

Perturbs the temperatures in state after copying for testing purposes
'true' to perturb temperatures.
Default: '.false.'

Tests the restart capabilities of weights with a more adequate test
'true' to set the weights to a slightly more complicated pattern for restart testing
Default: '.false.'

Turns on/off use of weights during averaging in tstcp
'true' to use weights.
Default: '.false.'

Type of condensate to assume in VAMP Generator
1 Uniform Condensate
2 Variable Condensate Uniform Number
3 Variable Condensate Variable Number
Default: 3

Number of subcolumns in VAMP Generator
Default: 10

Type of overlap to assume in VAMP Generator 1 Maximum
Default: 1

Control use of sub-columns within macro/micro physics;
'false' for no subcolumns.
Default: 'false'

Penetrative entrainment efficiency in UW shallow scheme.
Default: set by build-namelist

Autoconversion coefficient over land in ZM deep convection scheme.
Default: set by build-namelist

Autoconversion coefficient over ocean in ZM deep convection scheme.
Default: set by build-namelist

Tunable evaporation efficiency in ZM deep convection scheme.
Default: set by build-namelist

Tunable evaporation efficiency for land in ZM deep convection scheme.
Default: set by build-namelist

Turn on convective microphysics
Default: .false.

Convective momentum transport parameter (downward)
Default: set by build-namelist

Convective momentum transport parameter (upward)
Default: set by build-namelist

The number of negative buoyancy regions that are allowed before the convection top and CAPE calculations are completed.
Default: => 1 for CAM6;
         => 5 for all other

Include organization parameterization in ZM.   This value is set to true automatically
if -zmconv_org is set in configure.
Default: .false., unless -zmconv_org set in configure

If true, the active COSP cloud simulators are run to produce
select output for the AMWG diagnostics package.
sets cosp_ncolumns=10 and cosp_nradsteps=3
(appropriate for COSP statistics derived from seasonal averages),
and runs CloudSat radar and CALIPSO lidar simulators
(cosp_lradar_sim=.true.,cosp_llidar_sim=.true.).
This default logical is set in cospsimulator_intr.F90.
Default: FALSE

If true, COSP cloud simulators are run to produce
all output required for the COSP plots in the AMWG diagnostics package.
sets cosp_ncolumns=10 and cosp_nradsteps=3
(appropriate for COSP statistics derived from seasonal averages),
and runs MISR, ISCCP, MODIS, CloudSat radar and CALIPSO lidar simulators
(cosp_lmisr_sim=.true.,cosp_lisccp_sim=.true.,
cosp_lmodis_sim=.true.,cosp_lradar_sim=.true.,cosp_llidar_sim=.true.).
This default logical is set in cospsimulator_intr.F90.
Default: FALSE

If true, additional output is added to make it possible to
run COSP off-line.

This default is set in cospsimulator_intr.F90
Default: FALSE

This specifies the CAM history tape where extra COSP diagnostics will be written.

This default is set in cospsimulator_intr.F90
Default: -1

This specifies the CAM history tape where COSP diagnostics will be written.
Ignored/not used if any of the cosp_cfmip_* namelist variables are invoked.

This default is set in cospsimulator_intr.F90
Default: 1

If true, the ISCCP cloud simulator is run to produce
select output for the AMWG diagnostics package.
sets cosp_ncolumns=10 and cosp_nradsteps=3
(appropriate for COSP statistics derived from seasonal averages),
and runs ISCCP simulator
(cosp_lmisr_sim=.false.,cosp_lisccp_sim=.true.,
cosp_lmodis_sim=.false.,cosp_lradar_sim=.false.,cosp_llidar_sim=.false.).
This default logical is set in cospsimulator_intr.F90.
1236: Default: FALSE

Turns on sub-column output from COSP.
If both the isccp/misr simulators and the lidar/radar simulators
are run, lfrac_out is from the isccp/misr simulators columns.
This default logical is set in cospsimulator_intr.F90
Default: FALSE

If true, COSP ISCCP simulator will be run and all non-subcolumn output
will be saved.  ISCCP simulator is run on only daylight
columns.
Default: FALSE

If true, the COSP cloud simulators are run to produce
select output for the AMWG diagnostics package.
sets cosp_ncolumns=10 and cosp_nradsteps=3
(appropriate for COSP statistics derived from seasonal averages),
and runs MISR, ISCCP, MODIS, and CALIPSO lidar simulators
(cosp_lmisr_sim=.true.,cosp_lisccp_sim=.true.,
cosp_lmodis_sim=.true.,cosp_llidar_sim=.true.).
This default logical is set in cospsimulator_intr.F90.
Default: FALSE

If true, COSP lidar simulator will be run and all non-subcolumn output
will be saved
Default: FALSE

If true, MISR simulator will be run and all non-subcolumn output
will be saved.  MISR simulator is run on only daylight
columns.
Default: FALSE

If true, MODIS simulator will be run and all non-subcolumn output
will be saved.

Default: FALSE

If true, COSP radar simulator will be run and all non-subcolumn output
will be saved.
Default: FALSE

Number of subcolumns in SCOPS
This default logical is set in cospsimulator_intr.F90
Default: 50

This specifies the frequency at which is COSP is called,
every cosp_nradsteps radiation timestep.

This default is set in cospsimulator_intr.F90
Default: 1

If true, the passive COSP cloud simulators are run to produce
select output for the AMWG diagnostics package.
sets cosp_ncolumns=10 and cosp_nradsteps=3
(appropriate for COSP statistics derived from seasonal averages),
and runs MISR, ISCCP, and MODIS simulators
(cosp_lmisr_sim=.true.,cosp_lisccp_sim=.true.,cosp_lmodis_sim=.true.).
This default logical is set in cospsimulator_intr.F90.
Default: FALSE

If true, run all simulators using the default values cosp_ncolumns=50 and
cosp_nradsteps=1.  This option is mainly intended for testing, but it also
must be used in order to output the input fields needed to run the
simulator in an offline mode (via setting cosp_histfile_aux=.true.).
Default: FALSE

If true, the COSP cloud simulator is run.
Setting this namelist variable happens automatically if you compile with COSP.
COSP will not run unless this is set to .true. in the namelist!
Turn on the desired simulators using lXXX_sim namelist vars
If no specific simulators are specified, all of the simulators
are run on all columns and all output is saved. (useful for testing).
COSP is available with CAM4, CAM5 and CAM6 physics.
This default logical is set in cospsimulator_intr.F90.
Default: FALSE

Output constituent tendencies due to convection.  Set to
'none', 'q_only' or 'all'.
Default: 'q_only'

Turns on TEM circulation diagnostics history output.  Only valid for FV dycore.

Default: .false.,  unless it is overridden (WACCM with interactive chemistry and a few other specific
          configurations do this)

Switch for diagnostic output of the aerosol optics
Default: .false.

Switch for diagnostic output of the aerosol tendencies
Default: .false.

Produce output for the AMWG diagnostic package.
Default: .true.

Switch for cam4 T/Q budget diagnostic output
Default: .false.

History tape number T/Q budget output is written to.
Default: 1

Switch for diagnostics specific to the current CARMA model.
Default: .true.

Switch to turn on/off default output specific to CESM forcings.
Default: .false.

Switch for diagnostics specific to the current chemistry package or
configuration.
Default: .true.

Switch to turn on/off default output chemical species mixing ratios in the surface layer.
Default: .false.

Switch for diagnostics specific to CLUBB.
Default: .true.

Switch for diagnostics specific to dust.
Default: .false.

Switch for diagnostic output of eddy variables
Default: .false.

Switch to turn on/off default output specific to WACCM-SC forcings.
Default: .false.

Produce output for the AMWG variability diagnostics.
Default: .false.

Switch for diagnostic output used primarily for WACCM runs.
Default: .true. if WACCM physics is on, .false. otherwise.

Switch for diagnostic output used primarily for WACCM-X runs.
Default: .true. if WACCM-X is on, .false. otherwise.

Turn on verbose output identifying columns that fail energy/water
conservation checks.
Default: FALSE

Control the writing of qneg3 and qneg4 warning messages.
'summary' causes a summary of QNEG3 and QNEG4 errors to be
    printed at the end of the run
'timestep' causes a summary of QNEG3 and QNEG4 errors to be printed at the
    end of each timestep. The total is reset at the end of each timestep.
'off' causes the qneg3 and qneg4 warnings to be supressed.
Note that these settings do not affect the availability of qneg
    history variables.
Default: 'summary'

History file number for offline unicon driver output.
Default: 2 (i.e., h1 history file)

Produce output for the offline unicon driver.
Default: .false.

If FALSE then CAM will set the deposition fluxes to zero before sending
them to the coupler.  A side effect of setting the
variable chem_rad_passive to TRUE is that this variable
will be set to FALSE (the deposition fluxes must be set to zero in order
for the chemistry not to impact the climate).
Default: TRUE

Name of file that the atmosphere component log messages will be written to.  By
default all log messages are written to stdout.
Default: ""

Absolute pathname of directory that the file specified by atm_logfile
will be written to.
Default: "."

Number of atm tasks.
Default: total number of tasks assigned to job.

Number of threads in each atm task.
Default: 1

Stride used in selecting the processes in the atm communicator group.
Default: 1

Root process of the atm communicator group.
Default: 0

Name of file that the driver component log messages will be written to.  By
default all log messages are written to stdout.
Default: ""

Absolute pathname of directory that the file specified by cpl_logfile
will be written to.
Default: "."

Number of cpl tasks.
Default: total number of tasks assigned to job.

Number of threads in each cpl task.
Default: 1

Stride used in selecting the processes in the cpl communicator group.
Default: 1

Root process of the cpl communicator group.
Default: 0

Name of file that the land component log messages will be written to.  By
default all log messages are written to stdout.
Default: ""

Absolute pathname of directory that the file specified by lnd_logfile
will be written to.
Default: "."

Number of ocn tasks.
Default: total number of tasks assigned to job.

Number of threads in each ocn task.
Default: 1

Stride used in selecting the processes in the ocn communicator group.
Default: 1

Root process of the ocn communicator group.
Default: 0

Name of file that the runoff component log messages will be written to.  By
default all log messages are written to stdout.
Default: ""

Absolute pathname of directory that the file specified by rof_logfile
will be written to.
Default: "."

Minimum wind speed for atmOcn flux calculations.
Default: none.

Surface albedo for diffuse radiation.
Default: none.

Surface albedo for direct radiation.
Default: none.

The maximum number of iterations to achieve convergence in dry adiabatic adjustment.
For WACCM-X it can be advantageous to use a number which is much higher than the CAM
default.
Default: 15

Number of layers from the top of the model over which to do dry convective
adjustment. Must be less than plev (the number of vertical levels).
Default: 3

del^2 horizontal diffusion coefficient.  This is used above the Nth order
diffusion.
Default: set by build-namelist

Number of days (from timestep 0) to run divergence damper. Use only if spectral
model becomes dynamicallly unstable during initialization. Suggested value:
2. (Value must be >= 0.)  Default: 0.

Nth order horizontal diffusion coefficient.
Default: set by build-namelist

The order N horizontal diffusion operator will be used in and below the
layer specified by this variable.
Default: 4

Order (N) of horizontal diffusion operator used below the sponge layers.
N must be a positive multiple of 2.
Default: 4

Number of levels over which to apply Courant limiter, starting at top of
model.
Default: 5

Number of dynamics timesteps per physics timestep. If zero, a best-estimate
will be automatically calculated.
Default: 1

Time filter coefficient.  Default: 0.06

Set to 1 to force the 2D transpose computation when a 1D decomposition is
used.  This is intended for debugging purposes only.
Default: 0

Flag to turn on corrections that improve angular momentum conservation.
Default: .false.

Flag to turn on a diagnostic calculation of angular momentum which is
written to the log file at each time step.  Also enables calculation of
fields written to history file which are used in conjuction with those
enabled by do_circulation_diags for detailed analysis.
Default: .false.

Flag to apply the fixer turned on by fv_am_fixer level by level.  The
intent is to not contaminate the stratospheric circulation with
tropospheric AM loss, where it is most likely greatest (due to the larger
divergence fields).  This option is experimental.
Default: .false.

Flag to apply an arbitrary fix based on solid-body rotation to the zonal
velocity fields to improve conservation of angular momentum.
Default: .false.

Flag to turn on corrections in FV geometry and/or pressure terms.
Default: .false.

Flag indicating whether the dynamics uses internal algorithm for energy
conservation.
Default: .false.

Overlapping of trac2d and cd_core subcycles.
Default: 0

Chooses level of velocity diffusion.
Default: 3.0e5

Chooses type of divergence damping and velocity diffusion.
div24del2flag = 2 for ldiv2 (default),
              = 4 for ldiv4,
              = 42 for ldiv4 + ldel2
where
ldiv2: 2nd-order divergence damping everywhere and increasing in top layers
ldiv4: 4th-order divergence damping
ldel2: 2nd-order velocity-component damping targetted to top layers,
       with coefficient del2coef

Default: set by build-namelist

1 for FFT filter always, 0 for combined algebraic/FFT filter.  The value 0
is used for CAM3, otherwise it is using the value 1.
Default: set by build-namelist

Enables optional filter for intermediate c-grid winds, (courtesy of Bill Putman).
Default: 0

Switch to apply variable physics appropriate for the thermosphere and ionosphere
Default: set by build-namelist

Flag to extend standard 4th-order PPM scheme to model top.
Default: .false.

Order (mode) of X interpolation (1,..,6).
East-West transport scheme.
   = 1: first order upwind
   = 2: 2nd order van Leer (Lin et al 1994)
   = 3: standard PPM
   = 4: enhanced PPM (default)
Default: 4

Order (mode) of Y interpolation (1,..,6).
North-South transport scheme.
   = 1: first order upwind
   = 2: 2nd order van Leer (Lin et al 1994)
   = 3: standard PPM
   = 4: enhanced PPM (default)
Default: 4

Scheme to be used for vertical mapping.
   = 1: first order upwind
   = 2: 2nd order van Leer (Lin et al 1994)
   = 3: standard PPM
   = 4: enhanced PPM (default)
Default: 4

Number of dynamics timesteps per physics timestep. If zero, a best-estimate
will be automatically calculated.
Default: 0

Number of tracer advection timesteps per physics timestep.
Nsplit is partitioned into nspltrac and nsplit/nspltrac,
with the latter being the number of dynamics timesteps per
tracer timestep, possibly rounded upward; after initialization,
the code quantity nsplit is redefined to be the number of
dynamics timesteps per tracer timestep.
Default: 0

Number of vertical re-mapping timesteps per physics timestep.
Nspltrac is partitioned into nspltvrm and nspltrac/nspltvrm,
with the latter being the number of tracer timesteps per
re-mapping timestep, possibly rounded upward; after initialization,
the code quantity nspltrac is redefined to be the number of
tracer timesteps per re-mapping timestep.
Default: 0

Flag to determine how to handle dpcoup warning messages
Default: off

Size of tracer domain decomposition for trac2d.
Default: 1

Geopotential method 2 pipeline parameter (routine geopk_d).
geopk_d implements a pipeline algorithm by dividing the
information that must be moved between processes into blocks. geopkblocks
specifies the number of blocks to use. The larger the number of blocks,
the greater the opportunity for overlapping communication with computation
and for decreasing instantaneous bandwidth requirements. The smaller the
number of blocks, the fewer MPI messages sent, decreasing MPI total latency.
See geopk_d within geopk.F90.
Default: 1

Geopotential method (routines geopk, geopk16, or geopk_d).
  =0 for transpose method;
  =1 for method using semi-global z communication with optional 16-byte arithmetic;
  =2 for method using local z communication;
method 0, method 1 with 16-byte arithmetic and method 2 are all bit-for-bit across decompositions;
method 0 scales better than method 1 with npr_z, and method 1 is superior to method 0 for small npr_z;
The optimum speed is attained using either method 1 with 8-byte
arithmetic (standard for geopk16) or method 2 when utilizing the
optimal value for the associated parameter geopkblocks; for the last
two subcycles of a timestep, method 0 is automatically used; see
geopk.F90 and cd_core.F90.

Default: 0

True for mod_comm irregular communication handshaking for cd_core/geopk
Default: .true.

True for mod_comm irregular communication handshaking for dyn_run/misc
Default: .true.

True for mod_comm irregular communication handshaking for gather
Default: .true.

True for mod_comm irregular communication handshaking for scatter
Default: .false.

True for mod_comm irregular communication handshaking for multiple tracers
Default: .true.

Maximum number of outstanding nonblocking MPI requests to allow when
using mp_swapirr and point-to-point communications for cd_core/geopk.
Setting this less than the maximum can improve robustness for large process
count runs. If set to less than zero, then do not limit the number of
outstanding send/receive requests.
Default: -1 (so no limit)

Maximum number of outstanding nonblocking MPI requests to allow when
using mp_swapirr and point-to-point communications for dyn_run/misc.
Setting this less than the maximum can improve robustness for large process
count runs. If set to less than zero, then do not limit the number of
outstanding send/receive requests.
Default: -1 (so no limit)

Maximum number of outstanding nonblocking MPI requests to allow when
using mp_swapirr and point-to-point communications for gather.
Setting this less than the maximum can improve robustness for large process
count runs. If set to less than zero, then do not limit the number of
outstanding send/receive requests.
Default: 64

Maximum number of outstanding nonblocking MPI requests to allow when
using mp_swapirr and point-to-point communications for scatter.
Setting this less than the maximum can improve robustness for large process
count runs. If set to less than zero, then do not limit the number of
outstanding send/receive requests.
Default: -1 (so no limit)

Maximum number of outstanding nonblocking MPI requests to allow when
using mp_swaptrirr and point-to-point communications for multiple tracers.
Setting this less than the maximum can improve robustness for large process
count runs. If set to less than zero, then do not limit the number of
outstanding send/receive requests.
Default: -1 (so no limit)

One or two simultaneous mod_comm irregular communications (excl. tracers)
Default: 2

True for geopk_d and mod_comm irregular communication blocking send for
cd_core/geopk; false for nonblocking send.
Default: .true.

True for mod_comm irregular communication blocking send for dyn_run/misc,
false for nonblocking send
Default: .true.

True for mod_comm irregular communication blocking send for gather,
false for nonblocking send
Default: .true.

True for mod_comm irregular communication blocking send for scatter,
false for nonblocking send
Default: .true.

True for mod_comm irregular communication blocking send for multiple
tracers, false for nonblocking send
Default: .true.

Mod_comm irregular underlying communication method for cd_core/geopk
0 for original mp_sendirr/mp_recvirr
1 for mp_swapirr and a point-to-point implementation of communication pattern
2 for mp_swapirr and a collective (MPI_Alltoallv) implementation of communication pattern
Default: 0

Mod_comm irregular underlying communication method for dyn_run/misc.
0 for original mp_sendirr/mp_recvirr
1 for mp_swapirr and a point-to-point implementation of communication pattern
2 for mp_swapirr and a collective (MPI_Alltoallv) implementation of communication pattern
Default: 0

Mod_comm irregular underlying communication method for gather
0 for original mp_sendirr/mp_recvirr
1 for mp_swapirr and a point-to-point implementation of communication pattern
2 for mp_swapirr and a collective (MPI_Alltoallv) implementation of communication pattern
Default: 1

Mod_comm irregular underlying communication method for scatter
0 for original mp_sendirr/mp_recvirr
1 for mp_swapirr and a point-to-point implementation of communication pattern
2 for mp_swapirr and a collective (MPI_Alltoallv) implementation of communication pattern
Default: 0

Mod_comm irregular underlying communication method for multiple tracers
0 for original mp_sendtrirr/mp_recvtrirr
1 for mp_swaptrirr and point-to-point communications
2 for mp_swaptrirr and all-to-all communications
Default: 0

Max number of tracers for simultaneous mod_comm irregular communications
Default: 3

For mod_comm gather/scatters, 0 for temporary contiguous buffers; 1 for mpi derived
types.
Default: 0

For geopk (geopktrans=1) messages, 0 for temporary contiguous buffers; 1 for mpi derived
types.
Default: 0

For mod_comm transposes, 0 for temporary contiguous buffers; 1 for mpi derived
types.
Default: 0

A four element integer array which specifies the YZ and XY decompositions.
The first two elements are the number of Y subdomains and number of Z
subdomains in the YZ decomposition.  The second two elements are the number
of X subdomains and the number of Y subdomains in the XY decomposition.
Note that both the X and Y subdomains must contain at least 3 grid points.
For example, a grid with 96 latitudes can contain no more than 32 Y
subdomains.  There is no restriction on the number of grid points (levels)
in a Z subdomain, but note that the threading parallelism in the FV dycore
is over levels, so for parallel efficiency it is best to have at least the
number of levels in each Z subdomain as there are threads available.

There are a couple of rough rules of thumb to follow when setting the 2D
decompositions.  The first is that the number of Y subdomains in the YZ
decomposition should be the same as the number of Y subdomains in the XY
decomposition (npr_yz(1) == npr_yz(4)).  The second is that the total
number of YZ subdomains (npr_yz(1)*npr_yz(2)) should equal the total number
of XY subdomains (npr_yz(3)*npr_yz(4)).

Default: ntask,1,1,ntask where ntask is the number of MPI tasks.  This is a
1D decomposition in latitude.

Control the writing of filew warning messages.
Default: 'off'

TRUE => the offline meteorology winds are defined on the model grid cell walls.
Default: FALSE

Name of file that contains the offline meteorology data.
Default: none

Name of directory that contains the offline meteorology data.
Default: none

Name of file that contains names of the offline meteorology data files.
Default: none

switch to turn on/off mass fixer for offline driver
Default: true

If true nudge atmospheric temperature (T) from the meteorology.
Default: true

multiplication factor for water vapor flux
Default: 1.0

water vapor flux field name in met data file
Default: 'QFLX'

TRUE => the offline meteorology file will be removed from local disk when no longer needed.
Default: FALSE

(km) bottom of relaxation region of winds for offline waccm
Default: 50.

(km) bottom of ramping relaxation region for metdata at model bottom
Default: 0.

(km) top of ramping relaxation region for metdata at model bottom
Default: 0.

Relaxation time (hours) applied to specified meteorology.
 - positive values less then time step size gives 100% nudging
 - negative values gives 0.0% nudging (infinite relaxation time)
Default: 0.0

(km) top of relaxation region of winds for offline waccm
Default: 60.

multiplication factor for srf heat flux
Default: 1.0

srf heat flux field name in met data file
Default: 'SHFLX'

multiplication factor for snow hieght
Default: 1.0

If false then do not allow surface models feedbacks influence climate
Default: true

If true nudge meteorology surface fields over the land. If false, then fields are
still nudged over the ocean.
Default: true

If met_srf_land is false, then determines whether to nudge proportional to the non-land
fraction (i.e. 1 - land fraction) (true), or to nudge everywhere except where land
fraction is 1 (false).
Default: false

If true nudge meteorology surface fields TAUX, TAUY, SHFLX, QFLX rather than force
Default: true

If true nudge meteorology surface fields from radiation. These include ASDIR, ASDIF,
ALDIR, ALDIF, and LWUP.
Default: false

If true nudge meteorology reference surface fields. These include TSREF, QREF, and U10.
Default: false

If true nudge meteorology reference for sea surface temperature and sea ice fraction
(SST and SEAICEFRAC).
Default: false

If true nudge surface sheer stress (TAUX, TAUY) from the meteorology.
Default: true

Spectral dynamics gather option.
   0: use mpi_allgatherv
   1: use point-to-point MPI-1 two-sided implementation
   2: use point-to-point MPI-2 one-sided implementation if supported,
        otherwise use MPI-1 implementation
   3: use Co-Array Fortran implementation if supported,
        otherwise use MPI-1 implementation
Default: 0

Spectral dynamics transpose option.
   0: use mpi_alltoallv
   1: use point-to-point MPI-1 two-sided implementation
   2: use point-to-point MPI-2 one-sided implementation if supported,
        otherwise use MPI-1 implementation
   3: use Co-Array Fortran implementation if supported,
        otherwise use MPI-1 implementation
Default: 0

Flag indicating whether to assign latitudes to equidistribute columns or
latitudes. This only matters when using a reduced grid.
Default: TRUE

Number of processes assigned to dynamics (SE, EUL and SLD dycores).
Default: Total number of processes assigned to job.

Stride for dynamics processes (EUL and SLD dycores).
E.g., if stride=2, assign every second process to the dynamics.
Default: 1

Specify the type of analytic initial conditions for an initial run.
held_suarez_1994: Initial conditions specified in Held and Suarez (1994)
moist_baroclinic_wave_dcmip2016: Moist baroclinic wave as used in the DCMIP 2016 experiments
dry_baroclinic_wave_dcmip2016: Dry baroclinic wave as used in the DCMIP 2016 experiments
dry_baroclinic_wave_jw2006: Dry baroclinic wave as specified in Jablonowski and Williamson (2006)
Default: 'none'

Full pathname of time-variant boundary dataset for greenhouse gas surface
values.
Default: set by build-namelist.

CH4 volume mixing ratio.  This is used as the time invariant surface value
of CH4 if no time varying values are specified.
Default: set by build-namelist.

CO2 volume mixing ratio.  This is used as the time invariant surface value
of CO2 if no time varying values are specified.
Default: set by build-namelist.

User override for the prescribed CO2 volume mixing ratio used by the radiation
calculation.  Note however that the prescribed value of CO2 which is sent
to the surface models is still the one that is set using either the
co2vmr or the scenario_ghg variables.
Default: not used

CFC11 volume mixing ratio adjusted to reflect contributions from many GHG
species.  This is used as the time invariant surface value of F11 if no
time varying values are specified.
Default: set by build-namelist.

CFC12 volume mixing ratio.  This is used as the time invariant surface value
of CFC12 if no time varying values are specified.
Default: set by build-namelist.

Data start year.  Use in conjunction
with ghg_yearstart_model.
Default: 0

Model start year.  Use in conjunction
with ghg_yearstart_data.
Default: 0

N2O volume mixing ratio.  This is used as the time invariant surface value
of N2O if no time varying values are specified.
Default: set by build-namelist

Amount of co2 ramping per year (percent).  Only used
if scenario_ghg = 'RAMP_CO2_ONLY'
Default: 1.0

CO2 cap if > 0, floor otherwise.  Specified as multiple or fraction of
inital value; e.g., setting to 4.0 will cap at 4x initial CO2 setting.
Only used if scenario_ghg = 'RAMP_CO2_ONLY'
Default: boundless if ramp_co2_annual_rate > 0, zero otherwise.

Date on which ramping of co2 begins.  The date is encoded as an integer in
the form YYYYMMDD.  Only used if scenario_ghg = 'RAMP_CO2_ONLY'
Default: 0

If scenario_ghg is set to "RAMPED" then the greenhouse
gas surface values are interpolated between the annual average values
read from the file specified by bndtvghg.
In that case, the value of this variable (> 0) fixes the year of the
lower bounding value (i.e., the value for calendar day 1.0) used in the
interpolation.  For example, if rampyear_ghg = 1950, then the GHG surface
values will be the result of interpolating between the values for 1950 and
1951 from the dataset.
Default: 0

Controls treatment of prescribed co2, ch4, n2o, cfc11, cfc12 volume mixing
ratios.  May be set to 'FIXED', 'RAMPED', 'RAMP_CO2_ONLY', or 'CHEM_LBC_FILE'.
FIXED => volume mixing ratios are fixed and have either default or namelist
         input values.
RAMPED => volume mixing ratios are time interpolated from the dataset
          specified by bndtvghg.
RAMP_CO2_ONLY => only co2 mixing ratios are ramped at a rate determined by
                    the variables ramp_co2_annual_rate, ramp_co2_cap,
                    and ramp_co2_start_ymd.
CHEM_LBC_FILE => volume mixing ratios are set from the chemistry lower boundary
                    conditions dataset specified by flbc_file.
Default: FIXED

Full pathname of time-variant boundary dataset for greenhouse gas production/loss
rates.  Only used by the simple prognostic GHG chemistry scheme that is
enabled via the argument "-prog_species GHG" to configure.
Default: set by build-namelist.

This variable should not be set by the user.  It is set by build-namelist
when the user specifies the argument "-prog_species GHG" to configure which
turns on a simple prognostic chemistry scheme for CH4, N2O, CFC11 and
CFC12.
Default: set by build-namelist

Full pathname of boundary dataset for meso-gamma ridges.
Default: set by build-namelist.

Efficiency associated with convective gravity waves from the Beres
scheme (deep convection).
Default: set by build-namelist.

Efficiency associated with convective gravity waves from the Beres
scheme (shallow convection).
Default: set by build-namelist.

Efficiency associated with gravity waves from frontogenesis.
Default: set by build-namelist.

Efficiency associated with inertial gravity waves from frontogenesis.
Default: set by build-namelist.

Efficiency associated with orographic gravity waves.
Default: set by build-namelist.

Efficiency scaling factor associated with anisotropic OGW.
Default: set by build-namelist.

Max efficiency associated with anisotropic OGW.
Default: 1.0

Efficiency scaling factor associated with anisotropic OGW.
Default: set by build-namelist.

Max efficiency associated with anisotropic OGW.
Default: 1.0

Critical Froude number squared (used only for orographic waves).
Default: set by build-namelist.

Frontogenesis function critical threshold.
Default: set by build-namelist.

Apply limiter on maximum wind tendency from stress divergence in gravity wave drag scheme.
Default: set by build-namelist

Width of speed bins (delta c) for gravity wave spectrum (reference wave
speeds are from -pgwv*dc to pgwv*dc).
Default: set by build-namelist.

Width of speed bins (delta c) for long wavelength gravity wave spectrum
(reference wave speeds are from -pgwv_long*dc_long to pgwv_long*dc_long).
Default: set by build-namelist.

Full pathname of Beres lookup table data file for gravity waves sourced
from deep convection.
Default: set by build-namelist.

Full pathname of Beres lookup table data file for gravity waves sourced
from shallow convection.
Default: set by build-namelist.

Apply limiters to tau before applying the efficiency factor, rather than
afterward.
Default: set by build-namelist

Scale SGH by land fraction in gravity wave drag
Default: set by build-namelist

Factor to multiply tau by, for orographic waves in the southern hemisphere.
Default: 1._r8

Whether or not to use tapering at the poles to reduce the effects of
mid-scale gravity waves from frontogenesis.
Default: set by build-namelist.

Inverse Prandtl number used in gravity wave diffusion
Default: set by build-namelist

Scaling factor for heating depth in gravity waves from convection.  If less than 1.0
this acts as an effective reduction of the gravity wave phase speeds needed to drive
the QBO.
Default: set by build-namelist

Whether or not to apply tapering at the top of the model (above 0.6E-02 Pa)
to reduce undesired effects of gravity waves in the thermosphere/ionosphere.
Default: set by build-namelist

Number of meso-Beta ridges (per gridbox) to invoke.
Default: 10 (set by build-namelist)

Number of meso-gamma ridges (per gridbox) to invoke.
Default: -1 (set by build-namelist)

Gravity wave spectrum dimension (wave numbers are from -pgwv to pgwv).
Default: set by build-namelist.

Dimension for long wavelength gravity wave spectrum (wave numbers are from
-pgwv_long to pgwv_long).
Default: set by build-namelist.

Drag coefficient for obstacles in low-level flow.
Default: 1.0

Drag coefficient for obstacles in low-level flow.
Default: 1.0

Force the stress due to gravity waves to be zero at the top of the model.
In the low-top model, this helps to conserve momentum and produce a QBO.
Default: set by build-namelist.

Background source strength (used for waves from frontogenesis).
Default: set by build-namelist.

Background source strength (used for inertial waves from frontogenesis).
Default: set by build-namelist.

Whether or not to allow trapping for meso-Beta Ridges.
Default: FALSE (set by build-namelist)

Whether or not to allow trapping for meso-gamma Ridges.
Default: set by build-namelist

Whether or not to enable gravity waves produced by deep convection.
Default: set by build-namelist.

Whether or not to enable gravity waves produced by shallow convection.
Default: .false.

Whether or not to enable gravity waves produced by frontogenesis.
Default: set by build-namelist.

Whether or not to enable inertial gravity waves produced by frontogenesis.
Default: set by build-namelist.

Whether or not to enable gravity waves produced by orography.
Default: set by build-namelist.

Whether or not to enable gravity waves produced by meso-Beta Ridges.
Default: set by build-namelist

Whether or not to enable gravity waves produced by meso-gamma Ridges.
Default: FALSE (set by build-namelist)

Enhancement factor for downslope wind stress in DS configuration.
Default: set by build-namelist.

Enhancement factor for downslope wind stress in SM configuration.
Default: set by build-namelist.

Enhancement factor for depth of downslope wind regime in DS configuration
Default: set by build-namelist.

If true, then adujust tauoro
Default: set by build-namelist.

If true, then adjust for bit-for-bit answers with the ("N5") configuration
Default: set by build-namelist.

If .true. use separate dividing streamlines for downslope wind and flow
splitting regimes ("DS" configuration).
If .false. use single dividing streamline as in Scinocca & McFarlane
2000 ("SM" configuration).
Default: set by build-namelist.

If true, then use smooth regimes
Default: set by build-namelist.

If TRUE gravity wave ridge scheme will contribute to vertical diffusion tendencies.
Default: TRUE

Critical inverse4 Froude number
Default: set by build-namelist.

Lower inverse Froude number limits on linear ramp terminating downslope wind regime for high mountains in DS configuration
Default: set by build-namelist.

Upper inverse Froude number limits on linear ramp terminating downslope wind regime for high mountains in DS configuration
Default: set by build-namelist.

minimum surface displacement height for orographic waves (m)
Default: set by build-namelist.

Minimum stratification allowing wave behavior
Default: set by build-namelist.

Minimum stratification allowing wave behavior
Default: set by build-namelist.

Minimum wind speed for orographic waves
Default: set by build-namelist.

Sets the averaging flag for all variables on a particular history file
series. Valid values are:

 A ==> Average
 B ==> GMT 00:00:00 average
 I ==> Instantaneous
 M ==> Minimum
 X ==> Maximum
 L ==> Local-time
 S ==> Standard deviation

The default is to use the averaging flags for each variable that are set in
the code via calls to subroutine addfld.

Defaults: set in code via the addfld and add_default subroutine calls.

if .true. then output CLUBBs history statistics
Default: false

if .true. then output CLUBBs radiative history statistics
Default: false

Same as fincl1, but for CLUBB statistics on radiation zm grid.
Default: none.

Same as fincl1, but for CLUBB statistics on radiation zt grid.
Default: none.

Same as fincl1, but for CLUBB statistics on surface.
Default: none.

Same as fincl1, but for CLUBB statistics on zm grid.
Default: none.

Same as fincl1, but for CLUBB statistics on zt grid.
Default: none.

Collect all column data into a single field and output in ncol format,
much faster than default when you have a lot of columns.
Default: false

If true don't put any of the variables on the history tapes by
default. Only output the variables that the user explicitly lists in
the fincl# namelist items.
Default: FALSE

List of fields to exclude from the 1st history file (by default the name
of this file contains the string "h0").
Default: none

List of fields to exclude from the 10th history file (by default the name
of this file contains the string "h9").
Default: none

List of fields to exclude from the 2nd history file (by default the name
of this file contains the string "h1").
Default: none

List of fields to exclude from the 3rd history file (by default the name
of this file contains the string "h2").
Default: none

List of fields to exclude from the 4th history file (by default the name
of this file contains the string "h3").
Default: none

List of fields to exclude from the 5th history file (by default the name
of this file contains the string "h4").
Default: none

List of fields to exclude from the 6th history file (by default the name
of this file contains the string "h5").
Default: none

List of fields to exclude from the 7th history file (by default the name
of this file contains the string "h6").
Default: none

List of fields to exclude from the 8th history file (by default the name
of this file contains the string "h7").
Default: none

List of fields to exclude from the 9th history file (by default the name
of this file contains the string "h8").
Default: none

List of fields to include on the first history file (by default the name of
this file contains the string "h0").  The added fields must be in Master
Field List.  The averaging flag for the output field can be specified by
appending a ":" and a valid averaging flag to the field name.  Valid flags
are:

 A ==> Average
 B ==> GMT 00:00:00 average
 I ==> Instantaneous
 M ==> Minimum
 X ==> Maximum
 L ==> Local-time
 S ==> Standard deviation

Default:  set in code via the addfld and add_default subroutine calls.

Same as fincl1, but for the 10th history file (by default
the name of this file contains the string "h9").
Default: none.

Same as fincl1lonlat, but for 10th history file.

List of columns or contiguous columns at which the fincl1 fields will be
output. Individual columns are specified as a string using a longitude
degree (greater or equal to 0.) followed by a single character
(e)ast/(w)est identifer, an underscore '_' , and a latitude degree followed
by a single character (n)orth/(s)outh identifier.  For example, '10e_20n'
would pick the model column closest to 10 degrees east longitude by 20
degrees north latitude.  A group of contiguous columns can be specified
using bounding latitudes and longitudes separated by a colon.  For example,
'10e:20e_15n:20n' would select the model columns which fall with in the
longitude range from 10 east to 20 east and the latitude range from 15
north to 20 north.
Default: none

Same as fincl1, but for the 2nd history file (by default
the name of this file contains the string "h1").
Default: none.

Same as fincl1lonlat, but for 2nd history file.

Same as fincl1, but for the 3rd history file (by default
the name of this file contains the string "h2").
Default: none.

Same as fincl1lonlat, but for 3rd history file.

Same as fincl1, but for the 4th history file (by default
the name of this file contains the string "h3").
Default: none.

Same as fincl1lonlat, but for 4th history file.

Same as fincl1, but for the 5th history file (by default
the name of this file contains the string "h4").
Default: none.

Same as fincl1lonlat, but for 5th history file.

Same as fincl1, but for the 6th history file (by default
the name of this file contains the string "h5").
Default: none.

Same as fincl1lonlat, but for 6th history file.

Same as fincl1, but for the 7th history file (by default
the name of this file contains the string "h6").
Default: none.

Same as fincl1lonlat, but for 7th history file.

Same as fincl1, but for the 8th history file (by default
the name of this file contains the string "h7").
Default: none.

Same as fincl1lonlat, but for 8th history file.

Same as fincl1, but for the 9th history file (by default
the name of this file contains the string "h8").
Default: none.

Same as fincl1lonlat, but for 9th history file.

Specific fields which will be written using the non-default precision on
the 1st history file.
Default: none

Specific fields which will be written using the non-default precision on
the 10th history file.
Default: none

Specific fields which will be written using the non-default precision on
the 2nd history file.
Default: none

Specific fields which will be written using the non-default precision on
the 3rd history file.
Default: none

Specific fields which will be written using the non-default precision on
the 4th history file.
Default: none

Specific fields which will be written using the non-default precision on
the 5th history file.
Default: none

Specific fields which will be written using the non-default precision on
the 6th history file.
Default: none

Specific fields which will be written using the non-default precision on
the 7th history file.
Default: none

Specific fields which will be written using the non-default precision on
the 8th history file.
Default: none

Specific fields which will be written using the non-default precision on
the 9th history file.
Default: none

Array of history filename specifiers.  The filenames of up to six history
output files can be controlled via this variable.  Filename specifiers give
generic formats for the filenames with specific date and time components,
file series number (0-5), and caseid, filled in when the files are
created. The following strings are expanded when the filename is created:
%c=caseid; %t=file series number (0-5); %y=year (normally 4 digits, more
digits if needed); %m=month; %d=day; %s=seconds into current day; %%=%
symbol.  Note that the caseid may be set using the namelist
variable case_name.

For example, for a simulation with caseid="test" and current date and time
of 0000-12-31 0:00UT, a filename specifier of "%c.cam2.h%t.%y-%m.nc" would
expand into "test.cam2.h0.0000-12.nc" for the first history file.  The
filename specifier "%c.cam2.h%t.%y-%m-%d-%s.nc" would expand to
"test.cam2.h1.0000-12-31-00000.nc" for the second history file. Spaces are
not allowed in filename specifiers. Although the character "/" is allowed
in the specifier, it will be interpreted as a directory name and the
corresponding directories will have to be created in the model execution
directory (directory given to configure with -cam_exedir option) before
model execution.  The first element is for the primary history file which
is output by default as a monthly history file.  Entries 2 through 6 are
user specified auxilliary output files.

Defaults: "%c.cam2.h0.%y-%m.nc", "%c.cam2.h1.%y-%m-%d-%s.nc", ...,
          "%c.cam2.h5.%y-%m-%d-%s.nc"

Frequency that initial files will be output: 6-hourly, daily, monthly,
yearly, or never.  Valid values: 'NONE', '6-HOURLY', 'DAILY', 'MONTHLY',
'YEARLY', 'CAMIOP', 'ENDOFRUN'.
Default: 'YEARLY'

If false then include only REQUIRED fields on IC file.  If true then
include required AND optional fields on IC file.
Default: FALSE

Selects output grid type for lat/lon interpolated output.
1: Equally spaced, including poles (FV scalars output grid).
2: Gauss grid (CAM Eulerian).
3: Equally spaced, no poles (FV staggered velocity).
Default: 1

Size of latitude dimension of grid for interpolated output.
If interpolate_nlat and interpolate_nlon are zero, reasonable values
will be chosen by the dycore based on the run resolution.
Default: 0

Size of longitude dimension of grid for interpolated output.
If interpolate_nlat and interpolate_nlon are zero, reasonable values
will be chosen by the dycore based on the run resolution.
Default: 0

If interpolate_output(k) = .true., then the k'th history file will be
interpolated to a lat/lon grid before output.
Default: .false.

Selects interpolation method for output on lat/lon grid.
0: Use SE's native high-order method.
1: Use a bilinear method.
Default: 1 (bilinear)

Array containing the starting time of day for local time history averaging.
Used in conjuction with lcltod_stop. If lcltod_stop is less than lcltod_start,
then the time range wraps around 24 hours. The start time is included in the
interval. Time is in seconds and defaults to 39600 (11:00 AM).  The first value
applies to the primary hist. file, the second to the first aux. hist. file, etc.
Default: none

Array containing the stopping time of day for local time history averaging.
Used in conjuction with lcltod_start. If lcltod_stop is less than lcltod_start,
then the time range wraps around 24 hours. The stop time is not included in the
interval. Time is in seconds and defaults to 0 (midnight).  The first value
applies to the primary hist. file, the second to the first aux. hist. file, etc.
Default: none

Array containing the maximum number of time samples written to a history
file.  The first value applies to the primary history file, the second
through tenth to the auxillary history files.
Default: 1,30,30,30,30,30,30,30,30,30

Array specifying the precision of real data written to each history file
series. Valid values are 1 or 2. '1' implies output real values are 8-byte
and '2' implies output real values are 4-byte.

Default: 2,2,2,2,2,2,2,2,2,2

Array of write frequencies for each history file series.
If nhtfrq(1) = 0, the file will be a monthly average.
If nhtfrq(i) > 0, frequency is specified as number of
timesteps.  If nhtfrq(i) < 0, frequency is specified
as number of hours.

Default: 0,-24,-24,-24,-24,-24,-24,-24,-24,-24

List of history fields to output along the satellite track specified by  sathist_track_infile
Default: none

Satellite track history filename specifier.  See hfilename_spec
Default:  "%c.cam2.sat.%y-%m-%d-%s.nc"

Sets the maximum number of observation columns written to the satellite track history file
series.
Default: 100000

Sets the number of columns closest to the observation that should be output. Setting
this to a number greater than 1 allows for spatial interpolation in the post processing.
Default: 1

Sets the number of timesteps closest to the observation that should be output. Setting
this to a number greater than 1 allows for temporal interpolation in the post processing.
Default: 1

Full pathname of the satellite track data used by the satellite track history
output feature.
Default: none

The first year of the multi-year SST dataset which is read by CICE for
the prescribed ice fraction.  This needs to be set for AMIP simulations.
Default: 0

The last year of the multi-year SST dataset which is read by CICE for
the prescribed ice fraction.  This needs to be set for AMIP simulations.
Default: 0

Full pathname of master restart file from which to branch. Setting is
Required for branch run.
Default: none

Full pathname of initial atmospheric state dataset (NetCDF format).
Default: set by build-namelist.

Perturb the initial conditions for temperature randomly by up to the given
amount. Only applied for initial simulations.
Default: 0.0

If TRUE, try to initialize data for all consituents by reading from the
initial conditions dataset. If variable not found then data will be
initialized using internally-specified default values.  If FALSE then don't
try reading constituent data from the IC file; just use the
internally-specified defaults.
Default: TRUE

Add diagnostic output for heterogeneous freezing code.
Default: .false.

Add diagnostics for pre-existing ice option in ice nucleation code to history output.
Default: .false.

Do Seifert and Behang (2001) autoconversion and accretion physics when set to true.
Default: .false.

Switch to control whether MG microphysics should adjust the temperature
at the level containing the cold point tropopause by using the value
obtain by extrapolating between levels.
Default: set by build-namelist

Efficiency factor for berg
Default: 1

Autoconversion size threshold
Default: set by build-namelist

Switch to control whether MG microphysics should prognose
cloud ice (cldice).
Default: .true., except for carma=cirrus and carma=carma_dust

Switch to control whether MG microphysics should prognose
cloud liquid (cldliq).
Default: .true.

Set .true. to hold cloud droplet number constant.
Default: .false.

In-cloud droplet number concentration when micro_mg_nccons=.true.
Default: 100.e6 m-3

Set .true. to hold cloud ice number constant.
Default: .false.

In-cloud ice number concentration when micro_mg_nicons=.true.
Default: 0.1e6 m-3

Number of substeps over MG microphysics.
Default: 1

Type of precipitation fraction.
Default: for CLUBB runs => in_cloud;
             all others => max_overlap

Sub-version number for MG microphysics
Default: 0

Version number for MG microphysics.  This value is set automatically based
on settings in configure and passed to build-namelist
Default: 1 for CAM5 and 2 for CAM6

prescribed aerosol bulk sulfur scale factor
Default: 2

Switch to control whether MG microphysics performs a uniform calculation or not
(useful for sub-columns)
Default: .false. unless use_subcol_microp is true

Switch to determine whether ice nucleation happens using the incloud (true) or
the gridbox average (false) relative humidity.  When true, it is assumed that
the incloud relative humidity for nucleation is 1.
Default: .true., except .false. for CAM6

Fraction of Aitken mode sulfate particles assumed to nucleate ice in the polar
stratospheric. Provides an increase in homogeneous freezing over the Liu&Penner method.
Temporary solution to adjust ice surface area density and dehydration in the
polar stratosphere where there doesn't seem to be enough nucleation. A value of
zero means Liu&Penner is used.
Default: 1.0

Subgrid scaling factor for relative humidity in ice nucleation code. If it has
a value of -1, then indicates that the subgrid scaling factor will be
calculated on the fly as 1 / qsatfac (i.e. the saturation scaling factor).
Default: set by build-namelist

Subgrid scaling factor for relative humidity in ice nucleation code in the
stratosphere. If it has a value of -1, then indicates that the subgrid
scaling factor will be calculated on the fly as 1 / qsatfac (i.e. the
saturation scaling factor).
Default: set by build-namelist

Indicates whether to use the tropopause level to determine where to adjust
nucleation for the stratosphere (true) or whether to use a hard coded transition
level from 100 to 125 hPa applied only in the polar regions (false).
Default: .true.

Switch to turn on heterogeneous freezing code.
Default: .false.

Switch to turn on treatment of pre-existing ice in the ice nucleation code.
Default: .false., except .true. for CAM6

       Number of time to update model data per day.
        (e.g. 48 --> 1800 Second timestep)
       Default: none
       

       Day at which Nudging Begins.
       Default: none
       

       Month at which Nudging Begins.
       Default: none
       

       Year at which Nudging Begins.
       Default: none
       

       Day at which Nudging Ends.
       Default: none
       

       Month at which Nudging Ends.
       Default: none
       

       Year at which Nudging Ends.
       Default: none
       

       Template for Nudging analyses file names.
        (e.g. '%y/ERAI_ne30np4_L30.cam2.i.%y-%m-%d-%s.nc')
       Default: none
       

       Select the form of nudging forcing, where (t'==Analysis times ; t==Model Times)
         0 -> NEXT-OBS: Target=Anal(t'_next)
         1 -> LINEAR:   Target=(F*Anal(t'_curr) +(1-F)*Anal(t'_next))
                            F =(t'_next - t_curr )/Tdlt_Anal
       Default: 0
       

       Invert Horizontal Window Function to its Compliment.
         TRUE  = value=0 inside the specified window, 1 outside
         FALSE = value=1 inside the specified window, 0 outside
       Default: FALSE
       

       LAT0 center of Horizontal Window in degrees [-90.,90.].
       Default: none
       

       Width of transition which controls the steepness of window transition in latitude.
        0. --> Step function
       Default: none
       

       Width of LAT Window in degrees.
       Default: none
       

       LON0 center of Horizontal Window in degrees [0.,360.].
       Default: none
       

       Width of transition which controls the steepness of window transition in longitude.
        0. --> Step function
       Default: none
       

       Width of LON Window in degrees.
       Default: none
       

       Toggle Model Nudging ON/OFF.

        FORCING:
        --------
        Nudging tendencies are applied as a relaxation force between the current
        model state values and target state values derived from the avalilable
        analyses. The form of the target values is selected by the 'Nudge_Force_Opt'
        option, the timescale of the forcing is determined from the given
        'Nudge_TimeScale_Opt', and the nudging strength Alpha=[0.,1.] for each
        variable is specified by the 'Nudge_Xcoef' values. Where X={U,V,T,Q,PS}

               F_nudge = Alpha*((Target-Model(t_curr))/TimeScale

        WINDOWING:
        ----------
        The region of applied nudging can be limited using Horizontal/Vertical
        window functions that are constructed using a parameterization of the
        Heaviside step function.

        The Heaviside window function is the product of separate horizonal and vertical
        windows that are controled via 12 parameters:

            Nudge_Hwin_lat0:     Specify the horizontal center of the window in degrees.
            Nudge_Hwin_lon0:     The longitude must be in the range [0,360] and the
                                 latitude should be [-90,+90].
            Nudge_Hwin_latWidth: Specify the lat and lon widths of the window as positive
            Nudge_Hwin_lonWidth: values in degrees.Setting a width to a large value (e.g. 999)
                                 renders the window a constant in that direction.
            Nudge_Hwin_latDelta: Controls the sharpness of the window transition with a
            Nudge_Hwin_lonDelta: length in degrees. Small non-zero values yeild a step
                                 function while a large value yeilds a smoother transition.
            Nudge_Hwin_Invert  : A logical flag used to invert the horizontal window function
                                 to get its compliment.(e.g. to nudge outside a given window).

            Nudge_Vwin_Lindex:   In the vertical, the window is specified in terms of model
            Nudge_Vwin_Ldelta:   level indcies. The High and Low transition levels should
            Nudge_Vwin_Hindex:   range from [0,(NLEV+1)]. The transition lengths are also
            Nudge_Vwin_Hdelta:   specified in terms of model indices. For a window function
                                 constant in the vertical, the Low index should be set to 0,
                                 the High index should be set to (NLEV+1), and the transition
                                 lengths should be set to 0.001
            Nudge_Vwin_Invert  : A logical flag used to invert the vertical window function
                                 to get its compliment.
       Default: FALSE
       

       Full pathname of analyses data to use for nudging.
        (e.g. '/$DIN_LOC_ROOT/atm/cam/nudging/')
       Default: none
       

       Normalized Coeffcient for PS nudging.
         [0.,1.] fraction of nudging tendency applied.
       Default: 0.
       

       Profile index for PS nudging.
         0 == OFF      (No Nudging of this variable)
         1 == CONSTANT (Spatially Uniform Nudging)
         2 == HEAVISIDE WINDOW FUNCTION
       Default: 0
       

       Normalized Coeffcient for Q nudging.
         [0.,1.] fraction of nudging tendency applied.
       Default: 0.
       

       Profile index for Q nudging.
         0 == OFF      (No Nudging of this variable)
         1 == CONSTANT (Spatially Uniform Nudging)
         2 == HEAVISIDE WINDOW FUNCTION
       Default: 0
       

       Normalized Coeffcient for T nudging.
         [0.,1.] fraction of nudging tendency applied.
       Default: 0.
       

       Number of analyses files per day.
        (e.g. 4 --> 6 hourly analyses)
       Default: none
       

       Select the timescale of nudging force, where (t'==Analysis times ; t==Model Times)
         0 -->  TimeScale = 1/Tdlt_Anal
         1 -->  TimeScale = 1/(t'_next - t_curr )
       Default: 0
       

       Profile index for T nudging.
         0 == OFF      (No Nudging of this variable)
         1 == CONSTANT (Spatially Uniform Nudging)
         2 == HEAVISIDE WINDOW FUNCTION
       Default: 0
       

       Normalized Coeffcient for U nudging.
         [0.,1.] fraction of nudging tendency applied.
       Default: 0.
       

       Profile index for U nudging.
         0 == OFF      (No Nudging of this variable)
         1 == CONSTANT (Spatially Uniform Nudging)
         2 == HEAVISIDE WINDOW FUNCTION
       Default: 0
       

       Normalized Coeffcient for V nudging.
         [0.,1.] fraction of nudging tendency applied.
       Default: 0.
       

       Profile index for V nudging.
         0 == OFF      (No Nudging of this variable)
         1 == CONSTANT (Spatially Uniform Nudging)
         2 == HEAVISIDE WINDOW FUNCTION
       Default: 0
       

       Width of transition for HIGH end of Vertical Window.
       Default: none
       

       HIGH Level Index for Verical Window specified in terms of model level indices.
         (e.g. For a 30 level model, Nudge_Vwin_Hindex ~ 30 )
       Default: none
       

       Invert Vertical Window Function to its Compliment.
         TRUE  = value=0 inside the specified window, 1 outside
         FALSE = value=1 inside the specified window, 0 outside
       Default: FALSE
       

       Width of transition for LOW end of Vertical Window.
       Default: none
       

       LOW Level Index for Verical Window specified in terms of model level indices.
         (e.g. Nudge_Vwin_Lindex ~ 0 )
       Default: none
       

Full pathname of time-variant ozone mixing ratio boundary dataset.
Default: set by build-namelist.

Add CAM3 prescribed ozone to the physics buffer.
Default: FALSE

Flag for yearly cycling of ozone data. If set to FALSE, a multi-year
dataset is assumed, otherwise a single-year dataset is assumed, and ozone
will be cycled over the 12 monthly averages in the file.
Default: TRUE

Full pathname of time-variant sea-surface temperature and sea-ice
concentration boundary dataset.
Default: set by build-namelist.

Full pathname of grid file for time-variant sea-surface temperature and sea-ice
concentration boundary dataset.
Default: set by build-namelist.

Full pathname of
Default: set by build-namelist.

True when model is configured to use an offline driver.
Default: Set by build-namelist.

List of filepaths for dataset for offline unit driver.
Default: none

Filepath for dataset for offline unit driver.
Default: none

Switch to turn on Fixed Dynamical Heating in the offline radiation tool (PORT).
Default: false

Perform mass conservation check on eddy diffusion operation.
Default: FALSE

Logical switch to turn on the beljaars scheme
Default: set by build-namelist

Logical switch to turn on implicit turbulent surface stress calculation in
diffusion solver routine.
Default: set by build-namelist

Logical switch to turn on turbulent mountain stress calculation in
vertical diffusion routine.
Default: set by build-namelist

Maximum master length scale designed to address issues in diag_TKE outside the
boundary layer.
In order not to disturb turbulence characteristics in the lower troposphere,
this should be set at least larger than a few km. However, this does not
significantly improve the values outside of the boundary layer. Smaller values
make some improvement, but it is also noisy. Better results are seen using
eddy_leng_max or kv_freetrop_scale.
Default: 40.e3 (m)

Maximum dissipation length scale designed to address issues with diag_TKE outside
the boundary layer, where the default value generates large diffusivities. A value
of 30 m is consistent with the length scales used in the HB scheme; however, this
will also reduce value in the boundary layer.
Default: 40.e3 (m)

Bottom pressure level at which namelist values for eddy_leng_max and
eddy_lbulk_max are applied. Default values are used at lower levels (i.e. the
boundary layer).
Default: 100.e3 (hPa)

Moist entrainment enhancement parameter.
Default: set by build-namelist

Type of eddy scheme employed by the vertical diffusion package.  'HB' for
Holtslag and Boville; 'diag_TKE' for diagnostic tke version of Grenier and
Bretherton; 'HBR' for Rasch modified version of 'HB'.
Default: set by build-namelist

Scaling factor that is applied (multiplied) to the eddy diffusivities
in the free troposphere (boundary layer to kv_top_pressure)
Default: 1.0

Pressure (Pa) that defined the upper atmosphere for adjustment of
eddy diffusivities from diag_TKE using kv_top_scale.
Default: 0.

Scaling factor that is applied (multiplied) to the eddy diffusivities
in the upper atmosphere (see kv_top_pressure).
Default: 1.0

Switch to turn on adjustment of the surface fluxes to reduce instabilities
in the surface layer.  Set to 1 to turn on the adjustments.
Default: 0

Turbulent mountain stress parameter used when turbulent mountain stress calculation
is turned on. See do_tms.
Default: 1.0 for CAM, set by build-namelist for WACCM, T31

Factor determining z_0 from orographic standard deviation [ no unit ]
Used when turbulent mountain stress calc is turned on. See do_tms.
Default: set by build-namelist for WACCM, T31

Plume widths for theta_l and rt
Default: 2.4

Low Skewness in C11 Skw. Function
Default: 0.7D0

High Skewness in C11 Skw. Function
Default: 0.35D0

Constant for u'^2 and v'^2 terms
Default: 2.2D0

C2 coef. for the rtp2_dp1 term
Default: 1.0

C2 coef. for the rtpthlp_dp1 term
Default: 1.3

C2 coef. for the thlp2_dp1 term
Default: 1.0

Low Skewness in C7 Skw. Function
Default: 0.5

High Skewness in C7 Skw. Function
Default: 0.5

Coef. #1 in C8 Skewness Equation
Default: 4.2

Momentum coefficient of Kh_zm
Default: 0.5

Thermo of Kh_zm
Default: 0.3

Apply cloud top radiative cooling parameterization
Default: .false.

Switch for CLUBB_ADV
Default: FALSE

Explicit diffusion on temperature and moisture when CLUBB is on
Default: .false.

Low Skw.: gamma coef. Skw. Fnct.
Default: 0.308

Uses PDF to compute perturbed values for l_avg_Lscale code
Default: .false.

Include the effects of ice latent heating in turbulence terms
Default: .false.

Intensity of stability correction applied to C1 and C6
Default: 0.04

Coef. applied to log(avg dz/thresh)
Default: 1.0D0

Include effects of precip evaporation on turbulent moments
Default: .false.

Rain evaporation efficiency factor.
Default: set by build-namelist

Factor to decrease sensitivity in the denominator of Skw calculation
Default: 0.0

CLUBB do explicit diffusion with a stability correction
Default: .false.

CLUBB timestep.
Default: set by build-namelist

Allocate all buffers as global.  This is a performance optimization on
machines for which allocation/deallocation of physpkg scope buffers on
every timestep was slow (Cray-X1).
Default: TRUE

Dynamics/physics transpose method for nonlocal load-balance.
0: use mpi_alltoallv.
1: use point-to-point MPI-1 two-sided implementation.
2: use point-to-point MPI-2 one-sided implementation if supported, otherwise use
   MPI-1 implementation.
3: use Co-Array Fortran implementation if supported, otherwise use MPI-1 implementation.
11-13: use mod_comm, choosing any of several methods internal to mod_comm.  The method
   within mod_comm (denoted mod_method) has possible values 0,1,2 and is set according
   to mod_method = phys_alltoall - modmin_alltoall, where modmin_alltoall is 11.
-1: use option 1 when each process communicates with less than half of the other
   processes, otherwise use option 0 (if max_nproc_smpx and nproc_busy_d are both > npes/2).
Default: -1

Select target number of chunks per thread.  Must be positive.
Default: 1

Physics grid decomposition options.
-1: each chunk is a dynamics block.
 0: chunk definitions and assignments do not require interprocess comm.
 1: chunk definitions and assignments do not require internode comm.
 2: optimal diurnal, seasonal, and latitude load-balanced chunk definition and assignments.
 3: chunk definitions and assignments only require communication with one other process.
 4: concatenated blocks, no load balancing, no interprocess communication.
Default: 2

Physics grid decomposition options.
 0: assign columns to chunks as single columns, wrap mapped across chunks
 1: use (day/night; north/south) twin algorithm to determine load-balanced pairs of
      columns and assign columns to chunks in pairs, wrap mapped
Default: 0 for unstructured grid dycores, 1 for lat/lon grid dycores

fc_gather flow control option:
 < 0 : use MPI_Gather
 >= 0: use point-to-point with handshaking messages and preposting
       receive requests up to
         max(min(1,fc_gather_flow_cntl),max_gather_block_size)
       ahead. Default value is defined by private parameter
       max_gather_block_size, which is currently set to 64.
Default: 64

Swap communication maximum request count:
 <=0: do not limit number of outstanding send/receive requests
  >0: do not allow more than swap_comm_maxreq outstanding
      nonblocking send requests or nonblocking receive requests
Default: 128

Swap communication protocol option (reduced set):
 3, 5:                  nonblocking send
 2, 3, 4, 5:            nonblocking receive
 4, 5:                  ready send
Default: 4

Use this variable to specify the latitude (in degrees) of a column to
debug.  The closest column in the physics grid will be used.
Default: none

Use this variable to specify the longitude (in degrees) of a column to
debug.  The closest column in the physics grid will be used.
Default: none

If set to .true., turns on extra validation of physics_state objects
in physics_update. Used mainly to track down which package is the
source of invalid data in state.
Default: .false.

Heat capacity of dry air at constant pressure [J/kg/K].
Default: set to shr_const value

Heat capacity of water vapor at constant pressure [J/kg/K].
Default: set to shr_const value

Acceleration of gravity [m/s**2].
Default: set to shr_const value

Molecular weight of dry air [g/mol]
Default: set to shr_const value

Molecular weight of water [g/mol].
Default: set to shr_const value

Planetary rotation rate (radians/second). Value set here is ONLY used in the atmosphere.
Default: set to shr_const value

Radius of Earth [m].
Default: set to shr_const value

Length of siderial day [seconds].
Default: set to shr_const value

Freezing point of water [K].
Default: set to shr_const value

MAM affects climate only below the top defined by this pressure (Pa).
Default: 0 for non-MAM cases, otherwise set by build-namelist

Molecular diffusion will be done only if the lowest pressure is
below this limit (Pa).
Default: 0.1

The level closest to this pressure (Pa) is the bottom of the region
where molecular diffusion is done.
Default: 50.

Troposphere cloud physics will be done only below the top defined
by this pressure (Pa).
Default: set by build-namelist

Full pathname of absorption/emission dataset.  Used only by camrt scheme.
It consists of terms used for determining the absorptivity and
emissivity of water vapor in the longwave parameterization of radiation.
Default: set by build-namelist.

Lower limit of cumulus cloud fraction.
Default: set by build-namelist

Convective water used in radiation?
0 ==> No
1 ==> Yes - Arithmetic average.
2 ==> Yes - Average in emissivity.
Default: set by build-namelist

filepath and name for ice optics data for rrtmg
Default: none

filepath and name for ice optics data for rrtmg
Default: none

Specifies length of time in timesteps (positive) or hours (negative) SW/LW
radiation will be run for every timestep from the start of an initial run.
Default: 0

Frequency of absorptivity/emissivity calculations in time steps (if
positive) or model hours (if negative).  To avoid having the abs/ems values
saved on the restart output, make sure that the interval of the abs/ems
calculation evenly divides the restart interval.
Default: -12

Frequency of long-wave radiation calculation in timesteps (if positive) or
model hours (if negative).
Default: -1

Frequency of short-wave radiation calculation in timesteps (if positive) or
model hours (if negative).
Default: -1