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C $Header: /u/gcmpack/MITgcm/pkg/seaice/seaice_itd_redist.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_REDIST |
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|
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C !INTERFACE: ========================================================== |
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SUBROUTINE SEAICE_ITD_REDIST( |
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I bi, bj, myTime, 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_REDIST |
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C | o checks if absolute ice thickness in any category |
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C | exceeds its category limits |
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C | o redistributes sea ice area and volume |
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C | and associated ice properties in thickness space |
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C | |
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C | Torge Martin, Feb. 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 to be checked and redistributed === |
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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 |
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C === Global variables to be redistributed === |
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C HSNOWITD :: snow thickness by category |
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C enthalpy ? |
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C temperature ? |
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C salinity ? |
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C age ? |
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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 bi, bj :: outer loop counters |
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C myTime :: current time |
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C myIter :: iteration number |
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C myThid :: Thread no. that called this routine. |
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_RL myTime |
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INTEGER bi,bj |
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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,k :: inner loop counters |
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C nITD :: number of sea ice thickness categories |
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C openwater :: open water area fraction |
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C |
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INTEGER i, j, 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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#ifdef SEAICE_AGE |
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INTEGER iTracer |
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#endif |
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_RL openwater(1-OLx:sNx+OLx,1-OLy:sNy+OLy) |
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|
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C---+-|--1----+----2----+----3----+----4----+----5----+----6----+----7-|--+----| |
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|
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c DO bj=myByLo(myThid),myByHi(myThid) |
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c DO bi=myBxLo(myThid),myBxHi(myThid) |
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C must now be called within bi,bj loop |
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|
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C calculate area of open water |
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DO j=1-OLy,sNy+OLy |
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DO i=1-OLx,sNx+OLx |
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openwater(i,j) = ONE |
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ENDDO |
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ENDDO |
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DO k=1,nITD |
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DO j=1-OLy,sNy+OLy |
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DO i=1-OLx,sNx+OLx |
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openwater(i,j) = openwater(i,j) - AREAITD(i,j,k,bi,bj) |
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ENDDO |
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ENDDO |
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ENDDO |
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|
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C ---------------------------------------------------- |
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C | redistribute/"advect" sea ice in thickness space | |
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C | as described in Bitz et al. (2001) | |
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C ---------------------------------------------------- |
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|
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C---+-|--1----+----2----+----3----+----4----+----5----+----6----+----7-|--+----| |
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|
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C --- Hibler-type "ridging", i.e. cut back excessive ice area fraction --- |
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C in case ice concentration exceeds 100% assume that |
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C convergence of floe field has eliminated all open water |
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C and eventual rafting occured in thinnest category: |
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DO j=1-OLy,sNy+OLy |
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DO i=1-OLx,sNx+OLx |
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IF (openwater(i,j) .lt. 0.0) |
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& AREAITD(i,j,1,bi,bj) = openwater(i,j) + AREAITD(i,j,1,bi,bj) |
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ENDDO |
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ENDDO |
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C |
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C the following steps only make sense if there are actually multi-categories |
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IF (nITD .gt. 1) THEN |
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C |
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C check if more thicker ice needs to be rafted to accomodate area excess: |
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DO k=1,nITD-1 |
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DO j=1-OLy,sNy+OLy |
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DO i=1-OLx,sNx+OLx |
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IF (AREAITD(i,j,k,bi,bj) .lt. 0.0) THEN |
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C --- pass concentration deficit up to next thicker category |
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C --- since all quantities are extensive, we add instead of average |
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AREAITD (i,j,k+1,bi,bj) = AREAITD (i,j,k+1,bi,bj) |
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& + AREAITD (i,j,k,bi,bj) |
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AREAITD (i,j,k ,bi,bj) = ZERO |
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HEFFITD (i,j,k+1,bi,bj) = HEFFITD (i,j,k+1,bi,bj) |
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& + HEFFITD (i,j,k,bi,bj) |
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HEFFITD (i,j,k ,bi,bj) = ZERO |
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HSNOWITD(i,j,k+1,bi,bj) = HSNOWITD(i,j,k+1,bi,bj) |
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& + HSNOWITD(i,j,k,bi,bj) |
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HSNOWITD(i,j,k ,bi,bj) = ZERO |
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C t1(k+1) = t1(k+1)+t1(k); t1(k) = ZERO |
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C t2(k+1) = t2(k+1)+t2(k); t2(k) = ZERO |
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C age(k+1)=age(k+1)+age(k);age(k)= ZERO |
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C this is for ridged sea ice volume fraction |
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C IF (PRESENT(rdg)) THEN |
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C rdg(k+1)=rdg(k+1)+rdg(k); rdg(k)= ZERO |
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C ENDIF |
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ENDIF |
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ENDDO |
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ENDDO |
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ENDDO |
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|
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C --- ice thickness redistribution --- |
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C now check that ice thickness stays within category limits |
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DO k=1,nITD-1 |
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DO j=1-OLy,sNy+OLy |
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DO i=1-OLx,sNx+OLx |
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IF (HEFFITD(i,j,k,bi,bj) .gt. |
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& Hlimit(k)*AREAITD(i,j,k,bi,bj)) THEN |
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C --- the upper thickness limit is exceeded: move ice up to next thicker category |
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AREAITD (i,j,k+1,bi,bj) = AREAITD (i,j,k+1,bi,bj) |
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& + AREAITD (i,j,k,bi,bj) |
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AREAITD (i,j,k ,bi,bj) = ZERO |
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HEFFITD (i,j,k+1,bi,bj) = HEFFITD (i,j,k+1,bi,bj) |
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& + HEFFITD (i,j,k,bi,bj) |
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HEFFITD (i,j,k ,bi,bj) = ZERO |
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HSNOWITD(i,j,k+1,bi,bj) = HSNOWITD(i,j,k+1,bi,bj) |
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& + HSNOWITD(i,j,k,bi,bj) |
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HSNOWITD(i,j,k ,bi,bj) = ZERO |
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C t1(k+1) = t1(k+1)+t1(k); t1(k) = ZERO |
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C t2(k+1) = t2(k+1)+t2(k); t2(k) = ZERO |
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C age(k+1)=age(k+1)+age(k);age(k)= ZERO |
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C IF (PRESENT(rdg)) THEN |
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C rdg(k+1)=rdg(k+1)+rdg(k);rdg(k)= ZERO |
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C ENDIF |
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ENDIF |
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ENDDO |
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ENDDO |
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ENDDO |
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C |
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DO k=nITD,2,-1 |
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DO j=1-OLy,sNy+OLy |
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DO i=1-OLx,sNx+OLx |
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IF (HEFFITD(i,j,k,bi,bj) .lt. |
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& Hlimit(k-1)*AREAITD(i,j,k,bi,bj)) THEN |
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C --- the lower thickness limit is exceeded: move ice down to next thinner category |
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AREAITD (i,j,k-1,bi,bj) = AREAITD (i,j,k-1,bi,bj) |
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& + AREAITD (i,j,k,bi,bj) |
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AREAITD (i,j,k ,bi,bj) = ZERO |
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HEFFITD (i,j,k-1,bi,bj) = HEFFITD (i,j,k-1,bi,bj) |
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& + HEFFITD (i,j,k,bi,bj) |
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HEFFITD (i,j,k ,bi,bj) = ZERO |
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HSNOWITD(i,j,k-1,bi,bj) = HSNOWITD(i,j,k-1,bi,bj) |
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& + HSNOWITD(i,j,k,bi,bj) |
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HSNOWITD(i,j,k ,bi,bj) = ZERO |
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c snow(k-1) = snow(k-1)+snow(k); snow(k) = ZERO |
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C t1(k-1) = t1(k-1)+t1(k); t1(k) = ZERO |
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C t2(k-1) = t2(k-1)+t2(k); t2(k) = ZERO |
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C age(k-1)=age(k-1)+age(k);age(k)= ZERO |
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C IF (PRESENT(rdg)) THEN |
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C rdg(k-1)=rdg(k-1)+rdg(k);rdg(k)= ZERO |
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C ENDIF |
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ENDIF |
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ENDDO |
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ENDDO |
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ENDDO |
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C |
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C end nITD>1 constraint |
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ENDIF |
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|
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C end bi,bj loop |
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c ENDDO |
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c 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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