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Seaice-only estimation in the Labrador Sea |
Seaice-only verification experiment in idealized periodic channel |
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Notes: |
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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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- 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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- 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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- 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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09-Sep-2005 |
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heimbach@mit.edu, ifenty@mit.edu, menemenlis@jpl.nasa.gov |
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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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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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Instructions to configure: |
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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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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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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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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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1) main forward experiment (code, input) |
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Re-entrant zonally periodic channel (80x42 grid points) with just level (Nr=1) |
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uniform resolution (5.km, 10m), solid Southern boundary with triangular shape |
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coastline ("bathy_3c.bin") |
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Use seaice (dynamics & thermodynamics from pkg/thsice) with EXF (see data.pkg) |
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with initial ice thickness of 0.2 m (but no snow) |
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(thSIceThick_InitFile='const+20.bin', in "input/data.ice") |
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Initial seaice concentration is 100 % everywhere |
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(thSIceFract_InitFile='const100.bin', in "input/data.ice") |
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and seaice is initially at rest. |
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At runtime turn off time-stepping in 'data', PARM01, using: |
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momStepping = .FALSE., |
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saltStepping = .FALSE., |
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tempAdvection=.FALSE., |
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And just keep surface temp relaxation (tauRelax = 1 month) toward fixed SST: |
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in data.exf : |
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> climsstperiod = 0.0, |
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> climsstTauRelax = 2592000., |
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> climsstfile = 'tocn.bin', |
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Forcing: |
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None of the forcing vary with time; Most of the input files have been |
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generated using matlab script "input/gendata.m". |
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SST relaxation field is uniform in X, parabolic function of Y with |
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maximum close to Southern boundary. |
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Atmospheric air temp is uniform in Y, and only vary with X (~sin(2.pi.x/Lx)) |
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with an amplitude of 4.K ('tair_4x.bin'); |
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Uses constant Relative Humidity (70%, file 'qa70_4x.bin') |
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constant and uniform downward shortwave (100.W/m2, 'dsw_100.bin'), |
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downward longwave (250.W/m^2, 'dlw_250.bin'), |
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zonal wind (10.m/s, 'windx.bin'), |
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no meridional wind, no precip. |
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Ocean surface currents comes from a 3 levels ocean-only run (without seaice) |
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using the same wind forcing (uVel_3c0.bin, vVel_3c0.bin) (matlab script: |
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"input/getdata.m") |
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Two matlab scripts ("input/grph_res.m" and "input/grph_diag.m") |
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are provided to make some basic plots (snap-shot and time-averaged |
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diagnostics). |
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2) other (secondary) experiments (using the same executable) |
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a) seaice-dynamics only with LSR solver (input.dyn_lsr/) |
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use same forcing as main forward experiment, |
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( link input files from "input.dyn_lsr/" dir 1rst, then from "input/" dir ) |
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but does not use at all pkg/thsice (advect pkg/seaice properties using |
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pkg/seaice advection S/R.); turn off seaice thermodynamics |
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(usePW79thermodynamics=.FALSE., in input.dyn_lsr/data.seaice). |
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b) seaice-dynamics only with JNFK solver (input.dyn_jfnk/) |
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use same forcing as main forward experiment, |
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( link input files from "input.dyn_jfnk/" dir 1rst, then from "input/" dir ) |
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turn off seaice thermodynamics (thSIce_skipThermo=.TRUE., in file |
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"input.dyn_jfnk/data.ice") and advect pkg/thsice properties using |
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pkg/thsice advection S/R. |
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c) seaice-thermodynamics only from pkg/seaice (input.thermo/) |
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use same forcing as main forward experiment, |
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( link input files from "input.thermo/" dir 1rst, then from "input/" dir ) |
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Except a different bathymetry (no triangular shape coast line in the South, |
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just a simple channel of constant width, with constant and uniform |
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zonal current of 0.2 m/s): |
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in "input.thermo/data": |
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bathyFile = 'channel.bin', |
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uVelInitFile = 'const+20.bin', |
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vVelInitFile = 'const_00.bin', |
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And use different initial seaice concentration from the main forward experiment: |
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(in "input.thermo/data.seaice", AreaFile = 'ice0_area.bin', |
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and HeffFile = 'ice0_heff.bin',) |
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100 % everywhere except in the 1rst and last 2 rows: 0., 10.% in the South |
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and 1.%, 0. in the North: |
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Turn off seaice dynamics (SEAICEuseDYNAMICS =.FALSE., in |
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"input.thermo/data.seaice") which implies no advection (zero ice velocity). |
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d) seaice-thermodynamics only from pkg/thsice (input.thsice/) |
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use same forcing as main forward experiment, |
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( link input files from "input.thsice/" dir 1rst, then from "input/" dir ) |
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Except for bathymetry and initial seaice concentration which are identical |
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to the one used in input.thermo/ : |
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(thSIceFract_InitFile='ice0_area.bin', in "input.thsice/data.ice") |
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No seaice dynamics and no seaice advection, so that none of pkg/seaice S/R |
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are used (useSEAICE = .TRUE., commented out in "input.thsice/data.pkg"), |
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3) main adjoint experiment (code_ad, input_ad) |
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Use similar forward set-up as "input.thermo/". |
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(to be completed ...) |
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