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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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gairxFile = 'u10m.labsea79' # 10-m zonal wind |
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gairyFile = 'v10m.labsea79' # 10-m meridional wind |
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tairFile = 'tair.labsea1979' # 2-m air temperature |
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qaFile = 'qa.labsea1979' # 2-m specific humidity |
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floFile = 'flo.labsea1979' # longwave radiation |
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fshFile = 'fsh.labsea1979' # shortwave radiation |
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rainFile = 'prate.labsea1979' # precipitation |
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evapFile = 'evap.labsea1979' # evaporation |
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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 verification |
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./testscript -force 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 5 5 7 7 7 8 10 9 6 6 6 6 7 5 7 5 7 FAIL lab_sea |
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Instructions for generating 1-CPU and 2-CPU executables |
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======================================================= |
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Generating 1-CPU executable: |
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cd ../verification/lab_sea/input |
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ln -sf ../code/SIZE.h . |
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ln -sf ../code/CPP_OPTIONS.h . |
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ln -sf ../code/CPP_EEOPTIONS.h . |
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../../../tools/genmake -makefile |
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==> on alhena use: |
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../../../tools/genmake -platform=o2k_noopt -makefile |
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make clean |
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make depend |
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make |
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mv mitgcmuv mitgcmuv_1 |
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Generating 2-CPU executable: |
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cd ../../../verification/lab_sea/input |
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ln -sf ../code/SIZE_2x1.h SIZE.h |
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ln -sf ../code/CPP_OPTIONS.h . |
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ln -sf ../code/CPP_EEOPTIONS_MPI.h CPP_EEOPTIONS.h |
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../../../tools/genmake -mpi -makefile |
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==> on alhena for comparison purposes use: |
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../../../tools/genmake -mpi -platform=o2k_noopt -makefile |
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==> on alhena for fast execution use: |
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../../../tools/genmake -mpi -platform=o2k -makefile |
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make clean |
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make depend |
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make |
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mv mitgcmuv mitgcmuv_2x1 |
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Instructions for running Experiment 1 |
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===================================== |
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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. It |
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is the default experiment of "verification/testscript lab_sea". |
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To run Experiment 1: |
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cd ../../../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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mitgcmuv_1 >&! output.txt |
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mkdir exp1 |
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mv *tave.0000000010.data exp1 |
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Use matlab script lookat_exp1.m to compare the output |
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of exp1 with that from release1_patch5 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 |
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===================================== |
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This is a 1-cpu test of the LSR solver. The solution is |
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compared to that of experiment 1, which used the ADI solver. |
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To run Experiment 2: |
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cd ../../../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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mitgcmuv_1 >&! output.txt |
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mkdir exp2 |
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mv *tave.0000000010.data exp2 |
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Use 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 |
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===================================== |
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This is a test of periodic boundary conditions for LSR |
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and ADI solvers. The domain has a flat bottom and |
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is periodic both in the x and the y directions. |
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All forcing files are null or constant (u10m = v10m = 5 m/s). |
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To run Experiment 3: |
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cd ../../../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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mitgcmuv_1 >&! 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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mitgcmuv_1 >&! output.txt |
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mkdir exp3b |
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mv *tave.0000000001.data exp3b |
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Use 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 |
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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 |
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tile edges for sea-ice dynamic solvers. |
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To run Experiment 4: |
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cd ../../../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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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 |
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lookat_exp4 |
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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 running Experiment 5 |
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===================================== |
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This is a 2-cpu, 2-year, test integration. It illustrates |
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convention used by seaice_get_forcing.F for multi-year forcing. |
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To run Experiment 5: |
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cd ../../../verification/lab_sea/input |
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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_exp5.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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To run Experiment 6: |
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cd ../../../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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mitgcmuv_1 >&! 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 exp6 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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Instructions for running Experiment 7 |
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===================================== |
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This is a 2-cpu, 10-hour integration used to test |
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tile edges for sea-ice thermodynamics (no dynamics). |
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2-CPU executable from experiment 4 is required. |
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To run Experiment 7: |
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cd ../../../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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mpirun -np 2 mitgcmuv_2x1 |
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mkdir exp7 |
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mv *tave.0000000010.data exp7 |
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Use the matlab script lookat_exp7.m to compare |
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the output of exp7 to that of exp6: |
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cd ../verification/lab_sea/matlab |
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matlab |
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lookat_exp7 |
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