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User's Guide to NCAR CAM2.0


2. Using CAM2.0

    2.4 Example Namelists

2.4.7 Example 7 -- Multi-year SST Dataset Run

This namelist generates a 2-year run using a multi-year SST dataset.  The starting date and time (START_YMD and START_TOD) for the model run must fall within the time frame spanned by the SST dataset.   In this case, the namelist variable  SSTCYC must be set to false in order to retrieve and time interpolate SST data for the proper year and month of the model run.  When SSTCYC is set to true the model ignores year information and only cycles over the first twelve months of data. 

To obtain this namelist, the user may invoke build-namelist with command line arguments. However, since the number of command line arguments for this case are numerous, an easier solution is for the user to first create a namelist file, namelist_input, with the following contents:

 &camexp
 caseid = 'run07'
 ctitle = 'multi-year SST (AMIP)dataset'
 bndtvs = '/data/atm/cam2/sst/pcmdi_sst_ccm_bcT42_1977_1998.012000.nc'
 start_ymd = 19790901
 start_tod = 0
 nelapse = -245
 sstcyc = .false.
 /

The user may then invoke build-namelist as follows: 


 % setenv CSMDATA /data
 % build-namelist -runtype branch -infile namelist_input

The user should invoke this command from the same directory from which configure was invoked.

 &camexp
 caseid = 'run07'
 ctitle = 'multi-year SST (AMIP)dataset'
 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_c020430.nc'
 bndtvs = '/data/atm/cam2/sst/sst_HadOIBl_bc_64x128_1949_2001_c020411.nc'
 bndtvo = '/data/atm/cam2/ozone/noaao3.1990.21999.nc'
 nsrest = 0
 start_ymd = 19790901
 start_tod = 0
 nelapse = -245
 sstcyc = .false.
 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'
 /

BNDTVS

This dataset must contain multi-year SST data for the time period over which the model will be integrated. In this example, the base date of the run is determined by START_YMD and START_TOD. If an end-of-file is read on the SST dataset, the code will abort rather than rewinding to recycle the data as in a single-year dataset.

START_YMD, START_TOD

These variables set the starting date and seconds of the model run to SEP 1, 1979 to be commensurate with dates on the SST dataset. If these namelist variables were not specified, the base date from the initial dataset would be used as the simulation starting date.

SSTCYC

Setting SSTCYC to .false. indicates that a multi-year SST time interpolation should be used to determine model SST data.

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$Name: $ $Revision: 1.1 $ $Date: 2004/06/08 02:57:22 $ $Author: jmccaa $