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This example sets up a small (20x16x23) Labrador Sea experiment |
This example sets up a small (20x16x23) Labrador Sea experiment |
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coupled to a dynamic thermodynamic sea-ice model. |
coupled to a dynamic thermodynamic sea-ice model. |
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A brief description of the sea-ice model is in "doc/seaice.ps". |
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. |
The domain of integration spans 280E to 320E and 46N to 78N. |
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Horizontal grid spacing is 2 degrees. |
Horizontal grid spacing is 2 degrees. |
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Forcing files are a 1979-1999 monthly climatology computed from the |
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) |
NCEP reanalysis (see pkg/seaice/SEAICE_FFIELDS.h for units and signs) |
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gairxFile = 'u10m.labsea79' # 10-m zonal wind |
uwindFile = 'u10m.labsea79' # 10-m zonal wind |
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gairyFile = 'v10m.labsea79' # 10-m meridional wind |
vwindFile = 'v10m.labsea79' # 10-m meridional wind |
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tairFile = 'tair.labsea1979' # 2-m air temperature |
atempFile = 'tair.labsea1979' # 2-m air temperature |
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qaFile = 'qa.labsea1979' # 2-m specific humidity |
aqhFile = 'qa.labsea1979' # 2-m specific humidity |
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floFile = 'flo.labsea1979' # longwave radiation |
lwdownFile = 'flo.labsea1979' # downward longwave radiation |
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fshFile = 'fsh.labsea1979' # shortwave radiation |
swdownFile = 'fsh.labsea1979' # downward shortwave radiation |
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rainFile = 'prate.labsea1979' # precipitation |
precipFile = 'prate.labsea1979' # precipitation |
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evapFile = 'evap.labsea1979' # evaporation |
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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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Instructions for running Experiment 1 |
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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This is a 1-cpu, 10-hour integration used to make sure that all the |
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files are available and that the model compiles and integrates. |
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To configure and compile the code: |
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cd MITgcmUV |
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mkdir bin exe |
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cd bin |
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ln -sf ../verification/lab_sea/code/SIZE.h . |
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ln -sf ../verification/lab_sea/code/CPP_OPTIONS.h . |
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ln -sf ../verification/lab_sea/code/CPP_EEOPTIONS.h . |
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../tools/genmake -makefile |
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make depend |
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make |
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To run: |
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cd ../exe |
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cp ../verification/lab_sea/input/* . |
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ln -sf data.10hours data |
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ln -sf data.seaice.adi data.seaice |
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mv mitgcmuv mitgcmuv1 |
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mitgcmuv1 >&! output.txt |
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mkdir exp1 |
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mv *tave.0000000010.data exp1 |
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There is comparison output in: |
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diff output.txt ../verification/lab_sea/results/output.txt | more |
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Use the matlab script lookat_exp1.m to compare the output |
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of exp1 with that from release1_beta1 sea-ice code: |
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cd ../verification/lab_sea/matlab |
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matlab |
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lookat_exp1 |
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Instructions for running Experiment 2 |
Using testscript to test sea-ice code |
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===================================== |
===================================== |
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This is a 1-cpu test of the LSR solver. The solution is |
Running the testscript experiment: |
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compared to that of experiment 1, which used the ADI solver. |
cd MITgcm/verification |
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1-CPU executable from experiment 1 is required. |
./testreport -t lab_sea |
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To run: |
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cd ../exe |
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cp ../verification/lab_sea/input/* . |
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ln -sf data.10hours data |
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ln -sf data.seaice.lsr data.seaice |
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mitgcmuv1 >&! output.txt |
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mkdir exp2 |
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mv *tave.0000000010.data exp2 |
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Use the matlab script lookat_exp2.m to compare |
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the output of exp2 to that of exp1: |
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cd ../verification/lab_sea/matlab |
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matlab |
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lookat_exp2 |
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Instructions for running Experiment 3 |
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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This is a test of periodic boundary conditions for LSR |
T S U V |
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and ADI solvers. The domain has a flat bottom and |
C D M c m s m s m s m s |
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is periodic both in the x and the y directions. |
n p a R g m m e . m m e . m m e . m m e . |
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All forcing files are null or constant |
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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(u10m = v10m = 5 m/s). |
g d e n d n x n . n x n . n x n . n x n . |
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1-CPU executable from experiment 1 is required. |
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To run: |
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cd ../exe |
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cp ../verification/lab_sea/input/* . |
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ln -sf data.1hour data |
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ln -sf data.seaice.testadi data.seaice |
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mitgcmuv1 >&! output.txt |
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mkdir exp3a |
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mv *tave.0000000001.data exp3a |
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ln -sf data.seaice.testlsr data.seaice |
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mitgcmuv1 >&! output.txt |
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mkdir exp3b |
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mv *tave.0000000001.data exp3b |
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Use the matlab script lookat_exp3.m to compare |
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the output of exp2 to that of exp1: |
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cd ../verification/lab_sea/matlab |
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matlab |
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lookat_exp3 |
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If the dynamic ice solvers are correct, they should converge to a |
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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constant solution. The tests above show that both the ADI and the LSR |
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solver are unable to handle periodic domains and therefore that they |
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cannot be "correctly" parallelized. |
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Instructions for running Experiment 4 |
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===================================== |
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This is a 2-cpu, 10-hour integration used to test |
Instructions for generating and running a 1-CPU experiment |
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tile edges for sea-ice dynamic solvers. |
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To configure and compile the code: |
cd MITgcm/verification/lab_sea |
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cd ../bin |
mkdir build |
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rm -rf *.f |
cd build |
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rm -rf *.o |
cp ../code/*.h ../code/packages.conf . |
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ln -sf ../verification/lab_sea/code/SIZE_2x1.h SIZE.h |
../../../tools/genmake2 |
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ln -sf ../verification/lab_sea/code/CPP_OPTIONS.h . |
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ln -sf ../verification/lab_sea/code/CPP_EEOPTIONS_MPI.h CPP_EEOPTIONS.h |
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../tools/genmake -mpi -makefile |
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( on alhena use: ../tools/genmake -mpi -platform=o2k -makefile ) |
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make depend |
make depend |
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make |
make |
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cd ../input |
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../build/mitgcmuv > output.txt |
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To run: |
Use matlab script lookat_exp1.m to compare the output |
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cd ../exe |
of exp1 with that from checkpoint51f sea-ice code: |
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cp ../verification/lab_sea/input/* . |
cd ../../../verification/lab_sea/matlab |
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ln -sf data.10hours data |
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ln -sf data.seaice.adi data.seaice |
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mv mitgcmuv mitgcmuv_2x1 |
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mpirun -np 2 mitgcmuv_2x1 |
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mkdir exp4 |
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mv *tave.0000000010.data exp4 |
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Use the matlab script lookat_exp4.m to compare |
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the 2-cpu output to that of exp1: |
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cd ../verification/lab_sea/matlab |
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matlab |
matlab |
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lookat_exp4 |
lookat_ice |
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The inaccuracy at the tile boundary can be decreased by increasing |
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NPSEUDO in data.seaice at the expense of computation time. |
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Also as sea-ice ages (thickens) the difference at the tiles becomes |
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increasingly small. For solver pkg/seaice/adi.F a value of NPSEUDO=10 |
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appears adequate for forward integrations but cannot be used for sea-ice |
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adjoint model. Work is underway to fix this problem. |
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Instructions for generating and running a 2-CPU experiment on kalpana |
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===================================================================== |
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Instructions for running Experiment 5 |
cd MITgcm/verification/lab_sea |
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===================================== |
mkdir build |
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cd build |
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This is a 2-cpu, 2-year, test integration. It illustrates |
\cp ../code/*.h ../code/packages.conf . |
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convention used for forcing data files by seaice_get_forcing.F. |
\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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To run: |
make depend |
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cd ../exe |
make |
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cp ../verification/lab_sea/input/* . |
cd ../input |
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cp eedata_mpi eedata |
mpirun -np 2 ../build/mitgcmuv |
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ln -sf data.2years data |
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ln -sf data.seaice.adi data.seaice |
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ln -sf evap.labsea1979 evap.labsea1980 |
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ln -sf flo.labsea1979 flo.labsea1980 |
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ln -sf fsh.labsea1979 fsh.labsea1980 |
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ln -sf prate.labsea1979 prate.labsea1980 |
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ln -sf qa.labsea1979 qa.labsea1980 |
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ln -sf tair.labsea1979 tair.labsea1980 |
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ln -sf u10m.labsea79 u10m.labsea80 |
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ln -sf v10m.labsea79 v10m.labsea80 |
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mpirun -np 2 mitgcmuv_2x1 |
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Use the matlab script lookat_exp3.m to compare |
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the 2-cpu output to SMMR-SSM/I data: |
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cd ../verification/lab_sea/matlab |
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matlab |
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lookat_exp5 |
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Disclaimer: |
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The comparison here is just for fun, not really supposed |
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to look anything like the data. |
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Otherwise it would put a lot of people out of business :-) |
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Instructions for running Experiment 6 |
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===================================== |
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This is a 1-cpu test of sea-ice thermodynamics (no dynamics). |
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The solution is compared to that of experiment 1. |
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1-CPU executable from experiment 1 is required. |
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To run: |
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cd ../exe |
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cp ../verification/lab_sea/input/* . |
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ln -sf data.10hours data |
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ln -sf data.seaice.nodynamics data.seaice |
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mitgcmuv1 >&! output.txt |
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mkdir exp6 |
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mv *tave.0000000010.data exp6 |
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Use the matlab script lookat_exp6.m to compare |
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the output of exp2 to that of exp1: |
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cd ../verification/lab_sea/matlab |
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matlab |
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lookat_exp6 |
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