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2.4.2 Example 2 -- T21 One Day Initial Run
The following namelist produces a one day T21 initial run using
Eulerian dynamics. To obtain the namelist,
build-namelist may be invoked with the following
arguments in the same directory from which "configure -res 32x64"
% setenv CSMDATA /data
% build-namelist -case run02 -namelist "&camexp start_ymd=010901 \
start_tod=0 stop_ymd=010902 stop_tod=0 mss_irt=0 /"
Note, that a space must be present between the last '0' above and the
To utilize this namelist, the model must be configured to run at T21
resolution. This namelist does not provides a CLM2.0 initial dataset
at T21. When an initial dataset is not specified, CLM2.0 will generate
'reasonable values' for certain model variables as part of its
initialization. When running without specifying an initial CLM2.0
dataset, the model should be run for several years in order
for the land-component to "spin-up". During a model run, CLM2.0 will
generate initial datasets either monthly or yearly depending on the
setting of the clmexp variable, HIST_CRTINIC. These
initial datasets can then be used to obtain "spun-up" initial states
for future T21 runs.
caseid = 'run02'
absems_data = '/data/atm/cam2/rad/abs_ems_factors_fastvx.052001.nc'
ncdata = '/data/atm/cam2/inic/gaus/cami_0000-09-01_32x64_L26_c020514.nc'
bndtvs = '/data/atm/cam2/sst/sst_HadOIBl_bc_32x64_clim.c020426.nc'
bndtvo = '/data/atm/cam2/ozone/noaao3.1990.21999.nc'
dtime = 1800
dif2 = 2.5E5.
dif4 = 2.0E16.
nsrest = 0
start_ymd = 010901
start_tod = 0
stop_ymd = 010902
stop_tod = 0
iyear_ad = 1950
mss_irt = 0
reset_csim_iceprops = .true.
fpftcon = '/data/lnd/clm2/pftdata/pft-physiology'
fsurdat = '/data/lnd/clm2/srfdata/cam/clms_32x64_c020515.nc
Specifies the T21 initial conditions dataset.
The default ozone dataset can be used with any spatial resolution.
The model will interpolate the dataset to the correct resolution.
Specifies the T21 SST dataset.
Specifies the appropriate timestep (1800 seconds) to use at T21.
Specifies the appropriate value of the del2 horizontal diffusion
coefficient to use at T21.
Specifies the appropriate value of the del4 horizontal diffusion
coefficient to use at T21.
Specifies the starting year, month and day of the model run.
Specifies the starting time of day of the model run.
Specifies the ending year, month and day for the model run.
The above namelist results in a run which will end after one
Specifies the stopping time of day for the model run. These
namelist settings results in a run which will end after one day.
Hint: When starting a long run, it is a good idea to make a
1-day initial run, then restart the case for the remainder of the
experiment. If the system crashes and the job is rerun,
the model will restart from the last restart files. If on the
other hand, you specified your model run as one long, initial
run, the job would reload the initial namelist and start again
from the beginning, duplicating all model results from the aborted
No history files or restart files will be archived. If there is no
connection to an archival device, MSS_IRT should be set to
zero and output datasets will be written to disk. If this
variable is non-zero, the model will build an archival command that it
will execute as a shell command.
Reset the state variables of the CSIM sea-ice model. Sometimes this
is needed to get the sea-ice model to start-up when the initial conditions
dataset is not in equilibrium. Typically, this is needed when the initial
conditions dataset used for the simulation was not a spun-up state output
from the model, but either interpolated from another dataset or from an
outside source such as empirical data.
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$Name: $ $Revision: 1.1 $ $Date: 2004/06/08 02:57:21 $ $Author: jmccaa $