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Seaice-only estimation in the Labrador Sea |
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------------------------------------------ |
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|
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Notes: |
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|
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- The offline code is enabled during compilation with: |
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ALLOW_BULK_OFFLINE in EXF_OPTIONS.h |
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|
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- At runtime turn off time-stepping in data PARM01 using: |
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saltStepping = .FALSE., |
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tempStepping = .FALSE., |
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momStepping = .FALSE., |
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|
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- specify SST in data.exf using: |
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climsstfile |
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climsststartdate1 |
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climsststartdate2 |
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climsstperiod |
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|
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- and turn off surface relaxation to avoid biasing output diagnostics: |
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climsstTauRelax = 0.0, |
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|
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============== |
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|
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09-Sep-2005 |
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heimbach@mit.edu, ifenty@mit.edu, menemenlis@jpl.nasa.gov |
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|
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This is a 2x2 degree configuration of a seaice-only model |
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in the Labrador Sea (Nx*Ny*Nz = 20*16*23). |
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The seaice model is forced by monthly-mean atmospheric state. |
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The lower boundary condition is SST, also provided as monthly-mean |
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fields (rather than being computed by an ocean component). |
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In its current form the seaice model is thermodynamic-only, i.e. |
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#undef SEAICE_ALLOW_DYNAMICS |
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The estimation problem consists of a least-squares fit of |
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daily-mean modeled vs. observed seaice fractional area. |
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Observations are from satellite-borne sounding microwave radiometers. |
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|
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The setup consists of 2 parts: |
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1. the forward/adjoint model component which computes the gradient of |
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the model vs. data mistif costfunction w.r.t. to the time-varying |
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atmospheric state. |
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2. the optimization/linesearch routine that uses the gradient information |
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to provide an improved guess of the control vector. |
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|
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Instructions to configure: |
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|
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0. Preparation |
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-------------- |
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# from model base dir., e.g. MITgcm/ |
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set basedir = `pwd` |
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cd ${basedir}/verification/lab_sea/ |
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mkdir exe |
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mkdir exe/optim |
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|
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1. forward/adjoint model component |
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---------------------------------- |
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cd ${basedir}/verification/lab_sea/build/ |
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../../../tools/genmake2 -mods ../code_ad_seaice_only |
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make depend |
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make adall |
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|
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2. optimization/linesearch routines |
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----------------------------------- |
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# This part needs more attention: |
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# Compiler options in the Makefile are hard-coded, |
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# make sure you choose the right ones for your platform |
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# |
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# Assume you are in model base dir., e.g. MITgcm/ |
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# |
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# A: lsopt |
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# -------- |
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cd ${basedir}/lsopt/ |
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# edit Makefile to choose right compiler |
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make |
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# |
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# B: optim |
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# -------- |
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cd ${basedir}/optim/ |
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# Makefile in ${basedir}/optim/ needs 4 adjustments: |
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# 1: -DMAX_INDEPEND=1000000 |
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# make sure this number is >= number of control elements |
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# 2: Make sure you've chosen the right compiler for your platform |
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# 3: Make sure you've chosen the right INCLUDEDIRS for the header files, |
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# in this case it is |
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# -I../verification/lab_sea/build/ |
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# 4: Make sure you've got the right set of BLAS libraries |
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# some are provided in lsopt/ |
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# See the README file in lsopt/ on how to get platform-optimized |
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# BLAS libraries, and how to best install them. |
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# If you're done with all these, just type |
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make |
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# |
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# C: move executable and parameter files to executable directory |
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# ------- |
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cp optim.x ../verification/lab_sea/exe/optim/. |
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cp ../lsopt/data.ecco ../lsopt/data.ctrl ../verification/lab_sea/exe/optim/. |
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|
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3. Run state estimation |
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----------------------- |
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cd ${basedir}/verification/lab_sea/exe/optim |
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ln -s ../data.optim . |
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cd ${basedir}/verification/lab_sea/exe |
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ln -s ../build/mitgcmuv_ad . |
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ln -s ../input_ad_seaice_only/* . |
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ln -s ../input/*.labsea1979 . |
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# |
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./run_estim.csh & |
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