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C $Header: /u/gcmpack/MITgcm/pkg/diagnostics/diag_calc_psivel.F,v 1.2 2011/07/06 01:45:32 jmc Exp $ |
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C $Name: $ |
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|
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#include "DIAG_OPTIONS.h" |
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|
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CBOP |
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C !ROUTINE: DIAG_CALC_PSIVEL |
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C !INTERFACE: |
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SUBROUTINE DIAG_CALC_PSIVEL( |
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I k, iPsi0, jPsi0, uTrans, vTrans, |
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O psiVel, psiLoc, |
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I prtMsg, myTime, myIter, myThid ) |
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C !DESCRIPTION: \bv |
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C *==========================================================* |
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C | SUBROUTINE DIAG_CALC_PSIVEL |
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C | o Calculate horizontal transport stream-function |
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C | from non-divergent horizontal transport. |
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C *==========================================================* |
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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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C === Global data === |
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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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#ifdef ALLOW_OBCS |
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# include "GRID.h" |
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# include "OBCS_GRID.h" |
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#endif /* ALLOW_OBCS */ |
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|
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C !INPUT/OUTPUT PARAMETERS: |
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C === Routine arguments === |
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C k :: current level |
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C i,jPsi0 :: indices of grid-point location where Psi == 0 |
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C uTrans :: horizontal transport, u-component |
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C vTrans :: horizontal transport, u-component |
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C psiVel :: horizontal stream-function |
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C psiLoc :: horizontal stream-function at special location |
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C prtMsg :: do print message to standard-output |
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C myTime :: current time of simulation (s) |
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C myIter :: current iteration number |
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C myThid :: my Thread Id number |
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INTEGER k |
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INTEGER iPsi0(nSx,nSy) |
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INTEGER jPsi0(nSx,nSy) |
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_RL uTrans(1-OLx:sNx+OLx,1-OLy:sNy+OLy,nSx,nSy) |
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_RL vTrans(1-OLx:sNx+OLx,1-OLy:sNy+OLy,nSx,nSy) |
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_RL psiVel(1-OLx:sNx+OLx,1-OLy:sNy+OLy,nSx,nSy) |
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_RL psiLoc(2) |
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LOGICAL prtMsg |
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_RL myTime |
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INTEGER myIter |
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INTEGER myThid |
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|
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C !LOCAL VARIABLES: |
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C === Local variables ==== |
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C bi, bj :: tile indices |
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C i, j :: loop indices |
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C dPsiX :: tile stream-function increment along X-dir |
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C dPsiY :: tile stream-function increment along Y-dir |
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C psiOri :: stream-function value at tile origin |
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INTEGER bi, bj |
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INTEGER i, j |
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_RL dPsiX (nSx,nSy) |
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_RL dPsiY (nSx,nSy) |
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_RL psiOri(nSx,nSy) |
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_RL offSet |
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LOGICAL zeroPsi |
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c CHARACTER*(MAX_LEN_MBUF) msgBuf |
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#ifdef ALLOW_OBCS |
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INTEGER is, js, ix, jx, iy, jy, ijCnt |
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INTEGER npass, nPts, prev_nPts |
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LOGICAL kPsi(1:sNx+1,1:sNy+1) |
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#endif /* ALLOW_OBCS */ |
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CEOP |
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|
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C-- Initialise |
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zeroPsi = iPsi0(1,1).GE.0 |
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psiLoc(1) = 0. |
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psiLoc(2) = 0. |
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|
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C-- step.1 : compute Psi over each tile separately |
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DO bj=myByLo(myThid),myByHi(myThid) |
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DO bi=myBxLo(myThid),myBxHi(myThid) |
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dPsiX (bi,bj) = 0. |
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dPsiY (bi,bj) = 0. |
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psiOri(bi,bj) = 0. |
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IF ( useOBCS ) THEN |
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C- Case with OBC: |
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#ifdef ALLOW_OBCS |
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C- Note: OB may introduce discontinuity in domain & tile stream-function map; |
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C within a tile: define a local "is-set" mask (=kPsi) and |
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C propagate stream-function value without assumption. |
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C between tiles: present code is not "general", likely to work with |
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C simple OB setting and/or simple tile connection (no exch2). |
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C A truly general algorithm requires to change CUMULSUM_Z_TILE (adding 1 |
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C more input dPsi/tile) and to account for disabled tile-connection due |
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C to OB when setting cumsum tile-mapping (W2_SET_MAP_CUMSUM). |
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DO j=1,sNy+1 |
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DO i=1,sNx+1 |
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kPsi(i,j) = .FALSE. |
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psiVel(i,j,bi,bj) = 0. |
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ENDDO |
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ENDDO |
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C- select starting point |
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ijCnt = sNx+sNy+1 |
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is = 0 |
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js = 0 |
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DO j=1,sNy |
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DO i=1,sNx |
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IF ( OBCS_insideMask(i,j,bi,bj).EQ.1. |
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& .AND. (i+j).LE.ijCnt ) THEN |
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is = i |
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js = j |
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ijCnt = i+j |
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ENDIF |
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ENDDO |
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ENDDO |
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IF ( is.EQ.0 ) THEN |
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nPts = 0 |
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ELSE |
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kPsi(is,js) = .TRUE. |
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nPts = 1 |
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ENDIF |
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npass = 0 |
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prev_nPts = 0 |
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DO WHILE ( nPts.GT.prev_nPts ) |
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prev_nPts = nPts |
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npass = npass + 1 |
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DO j=1,sNy+1 |
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DO i=1,sNx |
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IF ( OBCS_insideMask(i,j-1,bi,bj).EQ.1. .OR. |
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& OBCS_insideMask(i, j ,bi,bj).EQ.1. ) THEN |
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IF ( kPsi(i,j) .AND. .NOT.kPsi(i+1,j) ) THEN |
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nPts = nPts + 1 |
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kPsi(i+1,j) = .TRUE. |
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psiVel(i+1,j,bi,bj) = psiVel(i,j,bi,bj) |
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& + vTrans(i,j,bi,bj) |
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ENDIF |
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IF ( .NOT.kPsi(i,j) .AND. kPsi(i+1,j) ) THEN |
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nPts = nPts + 1 |
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kPsi(i,j) = .TRUE. |
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psiVel(i,j,bi,bj) = psiVel(i+1,j,bi,bj) |
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& - vTrans(i,j,bi,bj) |
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ENDIF |
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ENDIF |
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ENDDO |
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ENDDO |
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DO j=1,sNy |
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DO i=1,sNx+1 |
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IF ( OBCS_insideMask(i-1,j,bi,bj).EQ.1. .OR. |
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& OBCS_insideMask( i ,j,bi,bj).EQ.1. ) THEN |
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IF ( kPsi(i,j) .AND. .NOT.kPsi(i,j+1) ) THEN |
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nPts = nPts + 1 |
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kPsi(i,j+1) = .TRUE. |
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psiVel(i,j+1,bi,bj) = psiVel(i,j,bi,bj) |
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& - uTrans(i,j,bi,bj) |
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ENDIF |
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IF ( .NOT.kPsi(i,j) .AND. kPsi(i,j+1) ) THEN |
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nPts = nPts + 1 |
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kPsi(i,j) = .TRUE. |
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psiVel(i,j,bi,bj) = psiVel(i,j+1,bi,bj) |
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& + uTrans(i,j,bi,bj) |
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ENDIF |
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ENDIF |
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ENDDO |
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ENDDO |
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IF ( prtMsg .AND. nPts.GT.prev_nPts ) THEN |
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_BEGIN_MASTER( myThid ) |
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WRITE(standardMessageUnit,'(A,2I4,A,I6,I8)') |
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& ' diag_calc_psivel: bi,bj=', bi, bj, |
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& ' : npass,nPts=', npass, nPts |
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_END_MASTER( myThid ) |
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ENDIF |
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C- end do while (npass count) |
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ENDDO |
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C- set tile increments |
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ix = 0 |
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jx = 0 |
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DO i=sNx+1,1,-1 |
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DO j=1,sNy |
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IF ( kPsi(i,j) .AND. jx.EQ.0 ) THEN |
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ix = i |
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jx = j |
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ENDIF |
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ENDDO |
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ENDDO |
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IF ( jx.NE.0 ) dPsiX (bi,bj) = psiVel(ix,jx,bi,bj) |
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iy = 0 |
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jy = 0 |
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DO j=sNy+1,1,-1 |
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DO i=1,sNx |
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IF ( kPsi(i,j) .AND. iy.EQ.0 ) THEN |
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iy = i |
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jy = j |
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ENDIF |
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ENDDO |
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ENDDO |
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IF ( iy.NE.0 ) dPsiY (bi,bj) = psiVel(iy,jy,bi,bj) |
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IF ( prtMsg ) THEN |
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_BEGIN_MASTER( myThid ) |
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WRITE(standardMessageUnit,'(3(A,2I4))') |
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& ' diag_calc_psivel: is,js=', is,js, |
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& ' ; ix,jx=', ix,jx, ' ; iy,jy=', iy,jy |
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_END_MASTER( myThid ) |
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ENDIF |
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#endif /* ALLOW_OBCS */ |
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ELSE |
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C- Case without OBC: |
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psiVel(1,1,bi,bj) = psiOri(bi,bj) |
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j = 1 |
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DO i=1,sNx |
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psiVel(i+1,j,bi,bj) = psiVel(i,j,bi,bj) |
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& + vTrans(i,j,bi,bj) |
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ENDDO |
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C- note: can vectorise inner loop |
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DO j=1,sNy |
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DO i=1,sNx+1 |
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psiVel(i,j+1,bi,bj) = psiVel(i,j,bi,bj) |
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& - uTrans(i,j,bi,bj) |
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ENDDO |
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ENDDO |
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dPsiX (bi,bj) = psiVel(1+sNx,1,bi,bj) |
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dPsiY (bi,bj) = psiVel(1,1+sNy,bi,bj) |
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C- end with/without OBC cases |
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ENDIF |
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ENDDO |
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ENDDO |
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|
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CALL CUMULSUM_Z_TILE_RL( |
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O psiOri, psiLoc, |
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I dPsiX, dPsiY, myThid ) |
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|
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C-- step.2 : account for Psi @ tile origin |
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offSet = 0. |
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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+1 |
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DO i=1,sNx+1 |
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psiVel(i,j,bi,bj) = psiVel(i,j,bi,bj) + psiOri(bi,bj) |
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ENDDO |
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ENDDO |
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IF ( iPsi0(bi,bj)*jPsi0(bi,bj).GT.0 ) |
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& offSet = -psiVel(iPsi0(bi,bj),jPsi0(bi,bj),bi,bj) |
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ENDDO |
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ENDDO |
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|
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IF ( zeroPsi ) THEN |
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C-- step.3 : shift stream-function to satisfy Psi == 0 @ a particular location |
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_GLOBAL_SUM_RL( offSet, myThid ) |
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psiLoc(1) = psiLoc(1) + offSet |
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psiLoc(2) = psiLoc(2) + offSet |
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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+1 |
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DO i=1,sNx+1 |
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psiVel(i,j,bi,bj) = psiVel(i,j,bi,bj) + offSet |
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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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RETURN |
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END |
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