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C $Header: /u/gcmpack/MITgcm/pkg/seaice/advect.F,v 1.16 2006/03/14 11:38:43 mlosch 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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CStartOfInterface |
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SUBROUTINE advect( UI,VI,HEFF,HEFFM,myThid ) |
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C /==========================================================\ |
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C | SUBROUTINE advect | |
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C | o Calculate ice advection | |
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C |==========================================================| |
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C \==========================================================/ |
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IMPLICIT NONE |
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|
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C === Global variables === |
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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_PARAMS.h" |
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CML#include "SEAICE_GRID.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 === Routine arguments === |
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C myThid - Thread no. that called this routine. |
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_RL UI (1-OLx:sNx+OLx,1-OLy:sNy+OLy, nSx,nSy) |
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_RL VI (1-OLx:sNx+OLx,1-OLy:sNy+OLy, nSx,nSy) |
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_RL HEFF (1-OLx:sNx+OLx,1-OLy:sNy+OLy,3,nSx,nSy) |
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_RL HEFFM (1-OLx:sNx+OLx,1-OLy:sNy+OLy, nSx,nSy) |
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INTEGER myThid |
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CEndOfInterface |
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|
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C === Local variables === |
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C i,j,k,bi,bj - Loop counters |
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|
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INTEGER i, j, bi, bj |
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INTEGER K3 |
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_RL DELTT |
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_RL DIFFA (1-OLx:sNx+OLx,1-OLy:sNy+OLy, nSx,nSy) |
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|
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C NOW DECIDE IF BACKWARD EULER OR LEAPFROG |
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IF(LAD.EQ.1) THEN |
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C LEAPFROG |
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DELTT=SEAICE_deltaTtherm*TWO |
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K3=3 |
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ELSE |
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C BACKWARD EULER |
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DELTT=SEAICE_deltaTtherm |
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K3=2 |
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ENDIF |
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|
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C NOW REARRANGE HS |
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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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|
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DO j=1-OLy,sNy+OLy |
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DO i=1-OLx,sNx+OLx |
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HEFF(I,J,3,bi,bj)=HEFF(I,J,2,bi,bj) |
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HEFF(I,J,2,bi,bj)=HEFF(I,J,1,bi,bj) |
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ENDDO |
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ENDDO |
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|
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ENDDO |
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ENDDO |
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|
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#ifdef ALLOW_AUTODIFF_TAMC |
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CADJ STORE heff = comlev1, key = ikey_dynamics |
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#endif /* ALLOW_AUTODIFF_TAMC */ |
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|
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C NOW GO THROUGH STANDARD CONSERVATIVE ADVECTION |
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IF ( .NOT. SEAICEuseFluxForm ) THEN |
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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,sNy |
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DO I=1,sNx |
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CML This formulation gives the same result as the original code on a |
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CML lat-lon-grid, but may not be accurate on irregular grids |
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HEFF(I,J,1,bi,bj)=HEFF(I,J,K3,bi,bj) |
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& -DELTT*( |
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& ( HEFF(I ,J ,2,bi,bj)+HEFF(I+1,J ,2,bi,bj)) |
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& * UI(I+1,J, bi,bj) - |
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& ( HEFF(I ,J ,2,bi,bj)+HEFF(I-1,J ,2,bi,bj)) |
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& * UI(I ,J, bi,bj) ) |
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& *(HALF * _recip_dxF(I,J,bi,bj)) |
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& -DELTT*( |
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& ( HEFF(I ,J ,2,bi,bj)+HEFF(I ,J+1,2,bi,bj)) |
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& * VI(I ,J+1, bi,bj) |
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& * _dxG(I ,J+1,bi,bj) - |
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& ( HEFF(I ,J ,2,bi,bj)+HEFF(I ,J-1,2,bi,bj)) |
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& * VI(I ,J , bi,bj) |
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& * _dxG(I,J,bi,bj)) |
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& *(HALF * _recip_dyF(I,J,bi,bj) * _recip_dxF(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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ELSE |
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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,sNy |
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DO I=1,sNx |
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C-- Use flux form for MITgcm compliance, unfortunately changes results |
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HEFF(I,J,1,bi,bj)=HEFF(I,J,K3,bi,bj) |
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& -DELTT * HALF * ( |
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& + _dyG(I+1,J,bi,bj) * |
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& (HEFF(I ,J ,2,bi,bj)+HEFF(I+1,J ,2,bi,bj)) |
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& * UI(I+1,J , bi,bj) |
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& - _dyG(I,J,bi,bj) * |
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& (HEFF(I ,J ,2,bi,bj)+HEFF(I-1,J ,2,bi,bj)) |
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& * UI(I ,J , bi,bj) |
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& + _dxG(I ,J+1,bi,bj) * |
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& (HEFF(I ,J ,2,bi,bj)+HEFF(I ,J+1,2,bi,bj)) |
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& * VI(I ,J+1, bi,bj) |
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& - _dxG(I ,J ,bi,bj)* |
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& (HEFF(I ,J ,2,bi,bj)+HEFF(I ,J-1,2,bi,bj)) |
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& * VI(I ,J , bi,bj) |
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& )*recip_rA(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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ENDIF |
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|
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_BARRIER |
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CALL SEAICE_EXCH ( HEFF, myThid ) |
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_BARRIER |
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|
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IF (LAD .EQ. 2) THEN |
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|
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C NOW DO BACKWARD EULER CORRECTION |
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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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HEFF(I,J,3,bi,bj)=HEFF(I,J,2,bi,bj) |
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HEFF(I,J,2,bi,bj)=HALF*(HEFF(I,J,1,bi,bj) |
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& +HEFF(I,J,2,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 NOW GO THROUGH STANDARD CONSERVATIVE ADVECTION |
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IF ( .NOT. SEAICEuseFluxForm ) THEN |
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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,sNy |
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DO I=1,sNx |
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CML This formulation gives the same result as the original code on a |
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CML lat-lon-grid, but may not be accurate on irregular grids |
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HEFF(I,J,1,bi,bj)=HEFF(I,J,3,bi,bj) |
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& -DELTT*( |
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& (HEFF(I ,J ,2,bi,bj)+HEFF(I+1,J ,2,bi,bj)) |
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& * UI(I+1,J , bi,bj) - |
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& (HEFF(I ,J ,2,bi,bj)+HEFF(I-1,J ,2,bi,bj)) |
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& * UI(I ,J , bi,bj) ) |
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& *(HALF * _recip_dxF(I,J,bi,bj)) |
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& -DELTT*( |
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& (HEFF(I ,J ,2,bi,bj)+HEFF(I ,J+1,2,bi,bj)) |
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& * VI(I ,J+1, bi,bj) |
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& * _dxG(I,J+1,bi,bj) - |
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& (HEFF(I ,J ,2,bi,bj)+HEFF(I ,J-1,2,bi,bj)) |
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& * VI(I ,J , bi,bj) |
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& * _dxG(I,J,bi,bj)) |
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& *(HALF * _recip_dyF(I,J,bi,bj) * _recip_dxF(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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ELSE |
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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,sNy |
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DO I=1,sNx |
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C-- Use flux form for MITgcm compliance, unfortunately changes results |
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HEFF(I,J,1,bi,bj)=HEFF(I,J,3,bi,bj) |
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& -DELTT * HALF * ( |
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& + _dyG(I+1,J ,bi,bj) * |
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& (HEFF(I ,J ,2,bi,bj)+HEFF(I+1,J ,2,bi,bj)) |
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& * UI(I+1,J , bi,bj) |
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& - _dyG(I ,J ,bi,bj) * |
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& (HEFF(I ,J ,2,bi,bj)+HEFF(I-1,J ,2,bi,bj)) |
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& * UI(I ,J , bi,bj) |
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& + _dxG(I ,J+1,bi,bj) * |
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& (HEFF(I ,J ,2,bi,bj)+HEFF(I ,J+1,2,bi,bj)) |
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& * VI(I ,J+1, bi,bj) |
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& - _dxG(I ,J ,bi,bj) * |
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& (HEFF(I ,J ,2,bi,bj)+HEFF(I ,J-1,2,bi,bj)) |
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& * VI(I ,J , bi,bj) |
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& )*recip_rA(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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ENDIF |
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|
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_BARRIER |
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CALL SEAICE_EXCH( HEFF, myThid ) |
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_BARRIER |
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|
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C NOW FIX UP H(I,J,2) |
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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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HEFF(I,J,2,bi,bj)=HEFF(I,J,3,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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ENDIF |
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|
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C NOW DO DIFFUSION ON H(I,J,3) |
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C NOW CALCULATE DIFFUSION COEF ROUGHLY |
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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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DIFFA(I,J,bi,bj)= |
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& DIFF1*MIN( _dxF(I,J,bi,bj), _dyF(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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CALL DIFFUS(HEFF,DIFFA,HEFFM,DELTT, myThid) |
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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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HEFF(I,J,1,bi,bj)=(HEFF(I,J,1,bi,bj)+HEFF(I,J,3,bi,bj)) |
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& *HEFFM(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 NOW CALCULATE DIFFUSION COEF ROUGHLY |
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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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DIFFA(I,J,bi,bj)= |
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& -(MIN( _dxF(I,J,bi,bj), _dyF(I,J,bi,bj)))**2/DELTT |
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ENDDO |
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ENDDO |
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ENDDO |
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ENDDO |
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CALL DIFFUS(HEFF,DIFFA,HEFFM,DELTT, myThid) |
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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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HEFF(I,J,1,bi,bj)=(HEFF(I,J,1,bi,bj)+HEFF(I,J,3,bi,bj)) |
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& *HEFFM(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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RETURN |
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END |
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