User's Guide to NCAR CAM2.0

2. Using CAM2.0

    2.4 Example Namelists

2.4.1 Example 1 -- T42 One Day Initial Run

 % setenv CSMDATA /data
 % build_namelist

 &camexp
 caseid = 'camrun'
 absems_data = '/data/atm/cam2/rad/abs_ems_factors_fastvx.052001.nc'
 ncdata = '/data/atm/cam2/inic/gaus/cami_0000-09-01_64x128_T42_L26_c020514.nc'
 bndtvs = '/data/atm/cam2/sst/sst_HadOIBl_bc_64x128_clim_c020411.nc'
 bndtvo = '/data/atm/cam2/ozone/noaao3.1990.21999.nc'
 nsrest = 0
 nelapse= -1
 iyear_ad = 1950
 /

 &clmexp
 fpftcon = '/data/lnd/clm2/pftdata/pft-physiology'
 fsurdat = '/data/lnd/clm2/srfdata/cam/clms_64x128_c020514.nc'
 finidat = '/data/lnd/clm2/inidata/cam/clmi_0000-09-01_64x128_T42_c020514.nc'
 /

CASEID

The case identifier for this run is 'camrun'. It appears in the model log output and is utilized to construct the path names for archiving history and restart files. CASEID must be 32 (or fewer) valid UNIX filename characters.

ABSEMS_DATA

Specifies the water vapor absorptivity/emissivity dataset required by the radiation model. See "Model Input Datasets" .

NCDATA

Specifies the initial conditions dataset. See "Model Input Datasets" .

BNDTVS

Specifies the time-variant NetCDF sea surface temperature (SST) dataset.  See "Model Input Datasets" .

BNDTVO

Specifies the time-variant ozone dataset. See "Model Input Datasets" .

NSREST

Setting NSREST = 0 requests an initial run. Continuation (restart and branch) runs may also be specified via this variable. See Examples 3 and 5 for more information on continuation runs.

NELAPSE

Setting NELAPSE to -1 specifies that the run should execute for one model day.

IYEAR_AD

Specifies the earth's orbital parameters for 1950 AD.  See Example 4 or Table 2.4 for more information on how to set variable.  The year 1950 is used to most closely match the orbital parameters of previous releases of CCM3.

FSURDAT

Specifies the CLM2.0 surface dataset (containing time-invariant description of plant-types, of soils, etc.). If this namelist item is not specified, CLM2.0 will generate a surface dataset at runtime assuming that the high resolution surface type datasets are specified by the appropriate clmexp namelist variables (See Table 2.5). This, however, is a time-consuming process. We recommend, where possible, to use surface datasets that already exist.

FINIDAT

Specifies the CLM2.0 spun up initial conditions dataset. This dataset provides time variant CLM2.0 data (such as soil water amounts, temperatures, etc). If this file is not specified, CLM2.0 will create a "physically reasonable" set of initial conditions. However, starting from such conditions requires several simulation years to spin-up to equilibrium conditions. It is recommended to use previous datasets if available. By default, CLM2.0 creates initial condition filesat yearly, so previous simulations could be used to start new simulations (as long as the CLM2.0 surface dataset is the same).

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Questions on these pages can be sent to... erik@ucar.edu .