CESM3.0a DATM Namelist Definitions

      If set, include anomaly forcing streams in namelist.
    

      If set, include bias correction streams in namelist.
    

      general method that operates on the data.
      ----datamode = "CPLHIST"----
      CPLHIST mode will examine the fields found in all input data streams,
      if any input field names match the field names used internally, they
      are copied into the export array and passed directly to the coupler
      without any special user code.  Any required fields not found on an
      input stream will be set to zero except for aerosol deposition fields
      which will be set to a special value.
      ----datamode = "CORE2_NYF"----
      Coordinated Ocean-ice Reference Experiments (CORE) Version 2 Normal Year Forcing.
      ----datamode = "CORE2_IAF"----
      In conjunction with with CORE Version 2 atmospheric forcing data,
      provides the atmosphere forcing favored by the Ocean Model Working
      Group when coupling an active ocean model with observed atmospheric
      forcing.  This mode and associated data sets implement the CORE-IAF
      Version 2 forcing data, as developed by Large and Yeager (2008) at
      NCAR.  See the documentation for CORE version 2 datasets at
      http://data1.gfdl.noaa.gov/nomads/forms/mom4/COREv2.html Also see
      W.G.Large, S.G.Yeager (2008), The global climatology of an
      interannually varying air-sea flux data set.
      Clm Dyn doi 10.1007/s00382-008-0441-3.
      ----datamode = "CORE_IAF_JRA"----
      JRA55 intra-annual year forcing
      ----datamode = "CORE_RYF6162_JRA"----
      JRA55 Repeat Year Forcing 1961-1962
      ----datamode = "CORE_RYF8485_JRA"----
      JRA55 Repeat Year Forcing 1984-1985
      ----datamode = "CORE_RYF9091_JRA"----
      JRA55 Repeat Year Forcing 1990-1991
      ----datamode = "CORE_RYF0304_JRA"----
      JRA55 Repeat Year Forcing 2003-2004
      ----datamode = "CLMNCEP"----
      In conjunction with NCEP climatological atmosphere data, provides the
      atmosphere forcing favored by the Land Model Working Group when
      coupling an active land model with observed atmospheric forcing.  This
      mode replicates code previously found in CLM (circa 2005), before the
      LMWG started using the CCSM flux coupler and data models to do
      active-land-only simulations.
      ----datamode = "ERA5"----
      Fifth generation ECMWF atmospheric reanalysis of the global climate
      ----datamode = "SIMPLE"----
      Namelist-configurable, constant datm forcing for simple experiments
      ----datamode = "CPLHIST" ----
    

      density at the lowest model layer
      units: kg m-3
    

      filename containing correction factor data for use only with CORE2 modes (CORE2_IAF and CORE2_NYF).
    

      filename containing correction factor data for use only with CORE2 modes (CORE2_IAF and CORE2_NYF).
    

      If true, prescribed co2 is sent from datm (must be true for running with CLM).
    

      If true, prescribed aerosols are sent from datm (must be true for running with CLM).
    

      If true, prescribed nitrogen deposition fluxes are sent from datm (must be true for running with CLM).
    

      If true, prescribed o3 is sent from datm (must be true for running with CLM).
    

      Frequency to update radiation in number of steps (or hours if negative).

      irdasw is the radiation setting used to compute the next shortwave Julian date.
      Values greater than 1 set the next radiation to the present time plus either 1 or 2
      timesteps (depending on the value of nextsw_cday_calc) every iradsw timesteps.
      Values less than 0 set the next radiation to the present time plus either 1 or 2
      timesteps (depending on the value of nextsw_cday_calc) every -iradsw hours. If
      iradsw is either 0 or 1, the next radiation time is the present time plus 1
      timestep. (default=1 for non-CPLHIST cases, and -1 for CPLHIST cases.)
    

      Logic to use for calculating nextsw_cday. This variable has no effect when iradsw is
      0 or 1, so by default this only applies in CPLHIST cases.

      For CPLHIST cases, this should agree with the version of CAM (or other atmosphere
      model) used to generate the CPLHIST forcings; the valid values for this variable are
      based on this: 'cam6' is appropriate for cases generated with the driver ordering in
      CAM6 and earlier, and 'cam7' is appropriate for cases generated with the driver
      ordering in CAM7 and later.

      For 'cam6', the next radiation timestep is set to the present time plus 2 timesteps
      when mod(tod+dtime,delta_radsw)==0. For 'cam7', the next radiation timestep is set
      to the present time plus 1 timestep when mod(tod,delta_radsw)==0.
    

      Peak idealized longwave radiation to be passed to ice/ocean surface.
      units: W m-2
    

      Peak idealized shortwave radiation to be passed to ice/ocean surface.
      units: W m-2
    

      Constant bottom layer specific humidity
      units: kg kg-1
    

      Model restart filename for the data atmosphere model data.  This is
      optional.  If restfilm is null, the restart
      filename will be read from the DATM restart pointer file (or files for multiple instances).
    

      If set to true, than datm restarts will not be read on a continuation run.
      This capability is used, for example, in CTSM spinup runs.
    

      inst_pres_height_surface
      units: Pa
    

      Constant air temperature at lowest model layer
      units: K
    

      Constant zonal wind speed forcing for simple models.
      units: m s-1
    

      Constant meridional wind speed forcing for simple models.
      units: m s-1
    

      file specifying model mask if not obtained from input model mesh
    

      file specifying model mesh
    

      global size of nx
    

      global size of ny
    

List of streams used for the given DATM_MODE