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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

The following namelist results in a one day T42 initial run beginning on September 1st and using Eulerian dynamics (the default). To obtain this namelist, build-namelist may be invoked as follows in the same directory from which configure was invoked:

 % setenv CSMDATA /data
 % build_namelist

We again note that it is assumed that the root directory for the dataset distribution is /data.

 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

 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'


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.


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


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


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


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


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.


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


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.


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.


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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$Name: $ $Revision: 1.1 $ $Date: 2004/06/08 02:57:21 $ $Author: jmccaa $