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Example: Labrador Sea Region with Sea-Ice |
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========================================= |
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This example sets up a small (20x16x23) Labrador Sea experiment |
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coupled to a dynamic thermodynamic sea-ice model. |
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A brief description of the sea-ice model is in "seaice.ps". |
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The domain of integration spans 280E to 320E and 46N to 78N. |
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Horizontal grid spacing is 2 degrees. |
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The 23 vertical levels and the bathymetry file |
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bathyFile = 'bathy.labsea' |
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are obtained from the the 2-degree ECCO configuration. |
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Integration is initialized from annual-mean Levitus climatology |
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hydrogThetaFile = 'LevCli_temp.labsea' |
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hydrogSaltFile = 'LevCli_salt.labsea' |
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Surface salinity relaxation is to the monthly mean Levitus climatology |
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saltClimFile = 'SSS.labsea' |
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Forcing files are a 1979-1999 monthly climatology computed from the |
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NCEP reanalysis (see pkg/seaice/SEAICE_FFIELDS.h for units and signs) |
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uwindFile = 'u10m.labsea79' # 10-m zonal wind |
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vwindFile = 'v10m.labsea79' # 10-m meridional wind |
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atempFile = 'tair.labsea1979' # 2-m air temperature |
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aqhFile = 'qa.labsea1979' # 2-m specific humidity |
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lwdownFile = 'flo.labsea1979' # downward longwave radiation |
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swdownFile = 'fsh.labsea1979' # downward shortwave radiation |
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precipFile = 'prate.labsea1979' # precipitation |
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The experiment uses pkg/gmredi, pkg/kpp, pkg/seaice, and pkg/exf. |
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The test is a 1-cpu, 10-hour integration. Both the atmospheric |
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state and the open-water surface fluxes are provided by pkg/exf. |
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More pkg/seaice test experiments, configured for low and |
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high-resolution global cube-sphere domains are described |
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in MITgcm_contrib/high_res_cube/README_ice. |
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Using testscript to test sea-ice code |
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===================================== |
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Running the testscript experiment: |
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cd MITgcm/verification |
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./testreport -t lab_sea |
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Note that fairly large differences in accuracy occur across different |
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platforms. For example, testscript comparisons between g77 (Linux) |
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and f77 (SGI) generated output gives: |
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T S U V |
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C D M c m s m s m s m s |
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n p a R g m m e . m m e . m m e . m m e . |
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f n k u 2 i a a d i a a d i a a d i a a d |
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g d e n d n x n . n x n . n x n . n x n . |
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Y Y Y Y 8 10 9 11 10 9 11 13 10 9 8 8 9 8 9 8 9 FAIL lab_sea |
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Instructions for generating and running a 1-CPU experiment |
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========================================================== |
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cd MITgcm/verification/lab_sea |
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mkdir build |
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cd build |
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cp ../code/*.h ../code/packages.conf . |
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../../../tools/genmake2 |
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make depend |
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make |
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cd ../input |
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../build/mitgcmuv > output.txt |
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Use matlab script lookat_exp1.m to compare the output |
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of exp1 with that from checkpoint51f sea-ice code: |
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cd ../../../verification/lab_sea/matlab |
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matlab |
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lookat_ice |
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Instructions for generating and running a 2-CPU experiment on kalpana |
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===================================================================== |
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cd MITgcm/verification/lab_sea |
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mkdir build |
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cd build |
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\cp ../code/*.h ../code/packages.conf . |
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\cp ../code/SIZE.h_mpi SIZE.h |
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../../../tools/genmake2 -of ../../../tools/build_options/linux_ia64_efc+mpi_altix |
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make depend |
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make |
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cd ../input |
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mpirun -np 2 ../build/mitgcmuv |
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Instructions for testing useExfYearlyFields |
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=========================================== |
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cd MITgcm/verification/lab_sea/build |
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\rm * |
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\cp ../code/* . |
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sed 's/undef EXF_V/define EXF_V/' \ |
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../../../pkg/exf/EXF_OPTIONS.h > EXF_OPTIONS.h |
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../../../tools/genmake2 |
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make depend |
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make -j |
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cd ../run |
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\rm * |
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\cp ../input/* . |
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\mv v10m.labsea1979 v10m.labsea_1979 |
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\mv u10m.labsea1979 u10m.labsea_1979 |
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\mv flo.labsea1979 flo.labsea_1979 |
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\mv prate.labsea1979 prate.labsea_1979 |
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\mv tair.labsea1979 tair.labsea_1979 |
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\mv fsh.labsea1979 fsh.labsea_1979 |
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\mv qa.labsea1979 qa.labsea_1979 |
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\mv SSS_monthly.labsea1979 SSS_monthly.labsea_1979 |
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\ln -sf v10m.labsea_1979 v10m.labsea_1978 |
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\ln -sf u10m.labsea_1979 u10m.labsea_1978 |
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\ln -sf flo.labsea_1979 flo.labsea_1978 |
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\ln -sf prate.labsea_1979 prate.labsea_1978 |
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\ln -sf tair.labsea_1979 tair.labsea_1978 |
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\ln -sf fsh.labsea_1979 fsh.labsea_1978 |
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\ln -sf qa.labsea_1979 qa.labsea_1978 |
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\ln -sf SSS_monthly.labsea_1979 SSS_monthly.labsea_1978 |
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\mv data.exf_YearlyFields data.exf |
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\mv data_YearlyFields data |
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sed 's/tics = .TRUE./tics = .FALSE./' ../input/data.pkg > data.pkg |
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../build/mitgcmuv >& output.txt & |
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