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C $Header: /u/gcmpack/MITgcm/pkg/seaice/seaice_itd_pickup.F,v 1.2 2012/10/23 13:20:49 jmc Exp $ |
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C $Name: $ |
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|
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#include "SEAICE_OPTIONS.h" |
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|
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C !ROUTINE: SEAICE_ITD_PICKUP |
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|
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C !INTERFACE: ========================================================== |
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SUBROUTINE SEAICE_ITD_PICKUP( |
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I myIter, myThid ) |
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|
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C !DESCRIPTION: \bv |
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C *===========================================================* |
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C | SUBROUTINE SEAICE_ITD_PICKUP |
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C | o called in case pickup file does not contain |
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C | ITD variables but mean ice thickness and concentration |
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C | |
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C | o choose between two schemes: |
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C | |
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C | a) a simple scheme where the mean values are just put |
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C | into the first ITD category and then redustributed |
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C | into the correct category by SEAICE_ITD_REDIST |
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C | -> simpleSchemeFlag = .TRUE. |
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C | |
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C | b) a scheme that assumes a log-normal distribution based |
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C | on the mean ice thickness and a standard decviation |
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C | of LND_sigma=0.25 |
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C | -> simpleSchemeFlag = .FALSE. |
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C | |
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C | Torge Martin, Mai 2012, torge@mit.edu |
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C *===========================================================* |
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C \ev |
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|
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C !USES: =============================================================== |
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IMPLICIT NONE |
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|
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C === Global variables needed === |
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C AREA :: total sea ice area fraction |
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C HEFF :: mean in-situ sea ice thickness |
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C HSNOW :: mean in-situ snow layer depth |
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C |
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C === Global variables to be changed === |
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C AREAITD :: sea ice area by category |
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C HEFFITD :: sea ice thickness by category |
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C HSNOWITD :: snow thickness by category |
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C |
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#include "SIZE.h" |
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#include "EEPARAMS.h" |
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#include "PARAMS.h" |
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#include "GRID.h" |
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#include "SEAICE_SIZE.h" |
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#include "SEAICE_PARAMS.h" |
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#include "SEAICE.h" |
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|
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#ifdef ALLOW_AUTODIFF_TAMC |
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# include "tamc.h" |
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#endif |
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|
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C !INPUT PARAMETERS: =================================================== |
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C === Routine arguments === |
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C myIter :: iteration number |
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C myThid :: Thread no. that called this routine. |
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INTEGER myIter |
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INTEGER myThid |
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CEndOfInterface |
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|
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#ifdef SEAICE_ITD |
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|
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C !LOCAL VARIABLES: ==================================================== |
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C === Local variables === |
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C i,j,bi,bj,k :: Loop counters |
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C nITD :: number of sea ice thickness categories |
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C |
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INTEGER i, j, bi, bj, k |
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#ifdef ALLOW_AUTODIFF_TAMC |
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INTEGER itmpkey |
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#endif /* ALLOW_AUTODIFF_TAMC */ |
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_RL dummyTime |
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|
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C local variables for picking up ITD from single category pickup file |
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INTEGER LND_i, LND_iend |
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C parameters for log-normal distribution (LND) |
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_RL LND_sigma, LND_mu |
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PARAMETER(LND_sigma=0.25) |
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_RL LND_dx |
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_RL LND_tmp |
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C bin width of distribution |
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PARAMETER( LND_iend = 1000 ) |
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PARAMETER( LND_dx = 100.D0 / LND_iend ) |
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c PARAMETER(LND_dx=0.1) |
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c PARAMETER(LND_iend=INT(100./LND_dx)) |
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_RL LND_x (LND_iend) |
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_RL LND_pdf(LND_iend) |
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C flag for pickup scheme |
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LOGICAL simpleSchemeFlag |
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|
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simpleSchemeFlag = .TRUE. |
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dummyTime = 1.0 |
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|
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C---+-|--1----+----2----+----3----+----4----+----5----+----6----+----7-|--+----| |
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IF (simpleSchemeFlag) THEN |
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C-- Put all ice into one bin: |
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C |
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DO bj=myByLo(myThid),myByHi(myThid) |
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DO bi=myBxLo(myThid),myBxHi(myThid) |
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DO j=1-OLy,sNy+OLy |
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DO i=1-OLx,sNx+OLx |
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AREAITD(i,j,1,bi,bj) = AREA(i,j,bi,bj) |
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HEFFITD(i,j,1,bi,bj) = HEFF(i,j,bi,bj) |
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HSNOWITD(i,j,1,bi,bj) = HSNOW(i,j,bi,bj) |
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ENDDO |
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ENDDO |
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ENDDO |
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ENDDO |
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|
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C---+-|--1----+----2----+----3----+----4----+----5----+----6----+----7-|--+----| |
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ELSE |
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C-- Assume log-normal ITD: |
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|
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DO bj=myByLo(myThid),myByHi(myThid) |
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DO bi=myBxLo(myThid),myBxHi(myThid) |
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DO j=1-OLy,sNy+OLy |
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DO i=1-OLx,sNx+OLx |
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C |
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C initialize log-normal distribution |
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LND_mu = log(HEFF(i,j,bi,bj)/AREA(i,j,bi,bj)) |
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& - 0.5*LND_sigma*LND_sigma |
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LND_x(1) = 0.+LND_dx/2. |
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C make thickness bins |
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DO LND_i=2,LND_iend |
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LND_x(LND_i)=LND_x(LND_i-1)+LND_dx |
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ENDDO |
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C log-normal distribution: |
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DO LND_i=2,LND_iend |
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LND_tmp = log(LND_x(LND_i))-LND_mu |
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LND_pdf(LND_i)= 1. |
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& / (LND_x(LND_i)*LND_sigma*sqrt(2*3.1416)) |
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& * exp( -(LND_tmp*LND_tmp) |
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& / (2*LND_sigma*LND_sigma) ) |
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& * AREA(i,j,bi,bj) |
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ENDDO |
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C assign bins to ice thickness categories |
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k=1 |
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DO LND_i=1,LND_iend |
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IF ( LND_x(LND_i).GT.Hlimit(k) ) k=k+1 |
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AREAITD(i,j,k,bi,bj) = AREAITD(i,j,k,bi,bj) |
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& + LND_pdf(LND_i)*LND_dx |
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HEFFITD(i,j,k,bi,bj) = HEFFITD(i,j,k,bi,bj) |
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& + LND_pdf(LND_i)*LND_x(LND_i)*LND_dx |
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ENDDO |
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C |
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ENDDO |
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ENDDO |
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ENDDO |
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ENDDO |
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|
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ENDIF |
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|
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C---+-|--1----+----2----+----3----+----4----+----5----+----6----+----7-|--+----| |
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C finally sort into correct ice thickness category |
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C and compute bulk variables |
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C (needed for dynamic solver at beginning of seaice_model.F) |
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DO bj=myByLo(myThid),myByHi(myThid) |
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DO bi=myBxLo(myThid),myBxHi(myThid) |
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CALL SEAICE_ITD_REDIST( bi, bj, dummyTime, myIter, myThid) |
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CALL SEAICE_ITD_SUM( bi, bj, dummyTime, myIter, myThid) |
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ENDDO |
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ENDDO |
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|
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C---+-|--1----+----2----+----3----+----4----+----5----+----6----+----7-|--+----| |
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#endif /* SEAICE_ITD */ |
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RETURN |
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END |
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