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lsr.F
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lsr.F
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#include "SEAICE_OPTIONS.h"
#ifdef ALLOW_AUTODIFF
# include "AUTODIFF_OPTIONS.h"
#endif
#ifndef SEAICE_LSRBNEW
C Define this option below for an alternative discretization of
C d/dx[ (zeta-eta) dV/dy] and d/dy[ (zeta-eta) dU/dx]
# undef SEAICE_TEST
#endif
CStartOfInterface
SUBROUTINE lsr( ilcall, myThid )
C *==========================================================*
C | SUBROUTINE lsr |
C | o Solve ice momentum equation with an LSR dynamics solver|
C | (see Zhang and Hibler, JGR, 102, 8691-8702, 1997 |
C | and Zhang and Rothrock, MWR, 131, 845- 861, 2003) |
C | Written by Jinlun Zhang, PSC/UW, Feb-2001 |
C | zhang@apl.washington.edu |
C *==========================================================*
IMPLICIT NONE
C === Global variables ===
#include "SIZE.h"
#include "EEPARAMS.h"
#include "PARAMS.h"
#include "GRID.h"
#include "SEAICE_SIZE.h"
#include "SEAICE_PARAMS.h"
#include "SEAICE.h"
C#include "SEAICE_GRID.h"
#ifdef ALLOW_AUTODIFF_TAMC
# include "tamc.h"
#endif
C === Routine arguments ===
C myThid - Thread no. that called this routine.
INTEGER ilcall
INTEGER myThid
CEndOfInterface
#ifdef SEAICE_BGRID_DYNAMICS
C === Local variables ===
C i,j,bi,bj - Loop counters
INTEGER i, j, m, bi, bj, j1, j2, im, jm
INTEGER ICOUNT1, ICOUNT2
_RL WFAU, WFAV, WFAU1, WFAV1, WFAU2, WFAV2
_RL AA3, S1, S2, S1A, S2A
_RL e11loc, e22loc, e12loc
_RL COSWAT
_RS SINWAT
_RL ECM2, DELT1, DELT2
_RL TEMPVAR
C diagonals of coefficient matrices
_RL AU (1:sNx,1:sNy,nSx,nSy)
_RL BU (1:sNx,1:sNy,nSx,nSy)
_RL CU (1:sNx,1:sNy,nSx,nSy)
_RL AV (1:sNx,1:sNy,nSx,nSy)
_RL BV (1:sNx,1:sNy,nSx,nSy)
_RL CV (1:sNx,1:sNy,nSx,nSy)
C coefficients for lateral points, u(j+/-1)
_RL uRt1(1:sNx,1:sNy,nSx,nSy)
_RL uRt2(1:sNx,1:sNy,nSx,nSy)
C coefficients for lateral points, v(i+/-1)
_RL vRt1(1:sNx,1:sNy,nSx,nSy)
_RL vRt2(1:sNx,1:sNy,nSx,nSy)
C RHS
_RL rhsU (1:sNx,1:sNy,nSx,nSy)
_RL rhsV (1:sNx,1:sNy,nSx,nSy)
C symmetric and anti-symmetric drag coefficients
_RL DRAGS (1-OLx:sNx+OLx,1-OLy:sNy+OLy,nSx,nSy)
_RL DRAGA (1-OLx:sNx+OLx,1-OLy:sNy+OLy,nSx,nSy)
#ifdef SEAICE_LSRBNEW
LOGICAL doIterate4u, doIterate4v
CHARACTER*(MAX_LEN_MBUF) msgBuf
C coefficients of ice velocities in coefficient matrix
C for both U and V-equation
C XX: double derivative in X
C YY: double derivative in Y
C XM: metric term with derivative in X
C YM: metric term with derivative in Y
_RL UXX (1-OLx:sNx+OLx,1-OLy:sNy+OLy)
_RL UYY (1-OLx:sNx+OLx,1-OLy:sNy+OLy)
_RL UXM (1-OLx:sNx+OLx,1-OLy:sNy+OLy)
_RL UYM (1-OLx:sNx+OLx,1-OLy:sNy+OLy)
_RL VXX (1-OLx:sNx+OLx,1-OLy:sNy+OLy)
_RL VYY (1-OLx:sNx+OLx,1-OLy:sNy+OLy)
_RL VXM (1-OLx:sNx+OLx,1-OLy:sNy+OLy)
_RL VYM (1-OLx:sNx+OLx,1-OLy:sNy+OLy)
C abbreviations
_RL etaU (1-OLx:sNx+OLx,1-OLy:sNy+OLy)
_RL zetaU(1-OLx:sNx+OLx,1-OLy:sNy+OLy)
_RL etaV (1-OLx:sNx+OLx,1-OLy:sNy+OLy)
_RL zetaV(1-OLx:sNx+OLx,1-OLy:sNy+OLy)
C contribution of sigma on righ hand side
_RL sig11(1-OLx:sNx+OLx,1-OLy:sNy+OLy)
_RL sig22(1-OLx:sNx+OLx,1-OLy:sNy+OLy)
_RL sig12(1-OLx:sNx+OLx,1-OLy:sNy+OLy)
_RL sig21(1-OLx:sNx+OLx,1-OLy:sNy+OLy)
C auxillary fields
_RL CUU (1-OLx:sNx+OLx,1-OLy:sNy+OLy)
_RL CVV (1-OLx:sNx+OLx,1-OLy:sNy+OLy)
_RL URT (1-OLx:sNx+OLx,1-OLy:sNy+OLy)
_RL VRT (1-OLx:sNx+OLx,1-OLy:sNy+OLy)
#else
_RL URT(1-OLx:sNx+OLx), CUU(1-OLx:sNx+OLx)
_RL VRT(1-OLy:sNy+OLy), CVV(1-OLy:sNy+OLy)
_RL etaPlusZeta (1-OLx:sNx+OLx,1-OLy:sNy+OLy,nSx,nSy)
_RL zetaMinusEta(1-OLx:sNx+OLx,1-OLy:sNy+OLy,nSx,nSy)
_RL ETAMEAN (1-OLx:sNx+OLx,1-OLy:sNy+OLy,nSx,nSy)
_RL ZETAMEAN (1-OLx:sNx+OLx,1-OLy:sNy+OLy,nSx,nSy)
_RL dVdx (1-OLx:sNx+OLx,1-OLy:sNy+OLy)
_RL dVdy (1-OLx:sNx+OLx,1-OLy:sNy+OLy)
_RL dUdx (1-OLx:sNx+OLx,1-OLy:sNy+OLy)
_RL dUdy (1-OLx:sNx+OLx,1-OLy:sNy+OLy)
#ifdef SEAICE_TEST
_RL uz (1-OLx:sNx+OLx,1-OLy:sNy+OLy)
_RL vz (1-OLx:sNx+OLx,1-OLy:sNy+OLy)
#endif
INTEGER phexit
_RL AA1, AA2, AA4, AA5, AA6
#endif /* SEAICE_LSRBNEW */
_RL UERR
C abbreviations
_RL ucLoc(1-OLx:sNx+OLx,1-OLy:sNy+OLy,nSx,nSy)
_RL vcLoc(1-OLx:sNx+OLx,1-OLy:sNy+OLy,nSx,nSy)
_RL uTmp (1-OLx:sNx+OLx,1-OLy:sNy+OLy,nSx,nSy)
_RL vTmp (1-OLx:sNx+OLx,1-OLy:sNy+OLy,nSx,nSy)
C SET SOME VALUES
WFAU1=0.95 _d 0
WFAV1=0.95 _d 0
WFAU2=ZERO
WFAV2=ZERO
S1A=0.80 _d 0
S2A=0.80 _d 0
WFAU=WFAU1
WFAV=WFAV1
ICOUNT1=SEAICElinearIterMax
ICOUNT2=SEAICElinearIterMax
ECM2= 1. _d 0/(SEAICE_eccen**2)
SINWAT=SIN(SEAICE_waterTurnAngle*deg2rad)
COSWAT=COS(SEAICE_waterTurnAngle*deg2rad)
DO bj=myByLo(myThid),myByHi(myThid)
DO bi=myBxLo(myThid),myBxHi(myThid)
DO j=1-OLy,sNy+OLy-1
DO i=1-OLx,sNx+OLx-1
ucLoc(I,J,bi,bj) = 0.25 _d 0 * (
& + uIceB(I+1,J,bi,bj) + uIceB(I+1,J+1,bi,bj)
& + uIceB(I ,J,bi,bj) + uIceB(I, J+1,bi,bj) )
vcLoc(I,J,bi,bj) = 0.25 _d 0 * (
& + vIceB(I+1,J,bi,bj) + vIceB(I+1,J+1,bi,bj)
& + vIceB(I ,J,bi,bj) + vIceB(I, J+1,bi,bj) )
ENDDO
ENDDO
DO J=1-OLy,sNy+OLy-1
DO I=1-OLy,sNx+OLy-1
e11loc = 0.5 _d 0 * _recip_dxF(I,J,bi,bj) *
& (uIceB(I+1,J+1,bi,bj)+uIceB(I+1,J,bi,bj)
& -uIceB(I, J+1,bi,bj)-uIceB(I, J,bi,bj))
& + vcLoc(I,J,bi,bj) * k2AtC(I,J,bi,bj)
e22loc = 0.5 _d 0 * _recip_dyF(I,J,bi,bj) *
& (vIceB(I+1,J+1,bi,bj)+vIceB(I,J+1,bi,bj)
& -vIceB(I+1,J, bi,bj)-vIceB(I,J, bi,bj))
& + ucLoc(I,J,bi,bj) * k1AtC(I,J,bi,bj)
e12loc = 0.5 _d 0*(
& 0.5 _d 0 * _recip_dyF(I,J,bi,bj) *
& (uIceB(I+1,J+1,bi,bj)+uIceB(I,J+1,bi,bj)
& -uIceB(I+1,J, bi,bj)-uIceB(I,J, bi,bj))
& + 0.5 _d 0 * _recip_dxF(I,J,bi,bj) *
& (vIceB(I+1,J+1,bi,bj)+vIceB(I+1,J,bi,bj)
& -vIceB(I, J+1,bi,bj)-vIceB(I, J,bi,bj))
& - vcLoc(I,J,bi,bj)*k1AtC(I,J,bi,bj)
& - ucLoc(I,J,bi,bj)*k2AtC(I,J,bi,bj) )
C NOW EVALUATE VISCOSITIES
DELT1=(e11loc**2+e22loc**2)*(1. _d 0+ECM2)
& +4.0 _d 0*ECM2*e12loc**2
& +2.0 _d 0*e11loc*e22loc*(1. _d 0-ECM2)
IF ( DELT1 .LE. SEAICE_EPS_SQ ) THEN
DELT2=SEAICE_EPS
ELSE
DELT2=SQRT(DELT1)
ENDIF
ZETA(I,J,bi,bj) = 0.5 _d 0*PRESS0(I,J,bi,bj)/DELT2
C NOW PUT MIN AND MAX VISCOSITIES IN
ZETA(I,J,bi,bj) = MIN(SEAICE_zMax(I,J,bi,bj),ZETA(I,J,bi,bj))
ZETA(I,J,bi,bj) = MAX(SEAICE_zMin(I,J,bi,bj),ZETA(I,J,bi,bj))
C NOW SET VISCOSITIES TO ZERO AT HEFFMFLOW PTS
ZETA(I,J,bi,bj) = ZETA(I,J,bi,bj)*HEFFM(I,J,bi,bj)
ETA(I,J,bi,bj) = ECM2*ZETA(I,J,bi,bj)
PRESS(I,J,bi,bj) = 2.0 _d 0*ZETA(I,J,bi,bj)*DELT2
ENDDO
ENDDO
DO j=1,sNy
DO i=1,sNx
C NOW SET UP NON-LINEAR WATER DRAG, FORCEX, FORCEY
TEMPVAR=(uIce(I,J,bi,bj)-GWATX(I,J,bi,bj))**2
& +(vIce(I,J,bi,bj)-GWATY(I,J,bi,bj))**2
IF ( YC(I,J,bi,bj) .LT. ZERO ) THEN
DWATN(I,J,bi,bj) = SEAICE_waterDrag_south*SQRT(TEMPVAR)
ELSE
DWATN(I,J,bi,bj) = SEAICE_waterDrag*SQRT(TEMPVAR)
ENDIF
DWATN(I,J,bi,bj) = MAX(DWATN(I,J,bi,bj)*rhoConst,QUART)
C NOW SET UP SYMMETTRIC DRAG
DRAGS(I,J,bi,bj)=DWATN(I,J,bi,bj)*COSWAT
C NOW SET UP ANTI SYMMETTRIC DRAG PLUS CORIOLIS
DRAGA(I,J,bi,bj)=DWATN(I,J,bi,bj)
& *SIGN(SINWAT, _fCori(I,J,bi,bj))
& + AMASS(I,J,bi,bj) * _fCoriG(I,J,bi,bj)
C NOW ADD IN CURRENT FORCE
FORCEX(I,J,bi,bj)=FORCEX0(I,J,bi,bj)+DWATN(I,J,bi,bj)
& *(COSWAT*GWATX(I,J,bi,bj)
& -SIGN(SINWAT, _fCori(I,J,bi,bj))*GWATY(I,J,bi,bj))
FORCEY(I,J,bi,bj)=FORCEY0(I,J,bi,bj)+DWATN(I,J,bi,bj)
& *(SIGN(SINWAT, _fCori(I,J,bi,bj))*GWATX(I,J,bi,bj)
& +COSWAT*GWATY(I,J,bi,bj))
#ifndef SEAICE_LSRBNEW
C NOW CALCULATE PRESSURE FORCE AND ADD TO EXTERNAL FORCE
C only for old code, in the new code the pressure force
C is added to the rhs stress tensor terms
FORCEX(I,J,bi,bj)=FORCEX(I,J,bi,bj)
& -QUART * _recip_dxV(I,J,bi,bj)
& *(PRESS(I, J,bi,bj) + PRESS(I, J-1,bi,bj)
& - PRESS(I-1,J,bi,bj) - PRESS(I-1,J-1,bi,bj))
FORCEY(I,J,bi,bj)=FORCEY(I,J,bi,bj)
& -QUART * _recip_dyU(I,J,bi,bj)
& *(PRESS(I,J, bi,bj) + PRESS(I-1,J, bi,bj)
& - PRESS(I,J-1,bi,bj) - PRESS(I-1,J-1,bi,bj))
#endif /* not SEAICE_LSRBNEW */
FORCEX(I,J,bi,bj)=FORCEX(I,J,bi,bj)
& +AMASS(I,J,bi,bj)/SEAICE_deltaTdyn*uIceNm1(I,J,bi,bj)
FORCEY(I,J,bi,bj)=FORCEY(I,J,bi,bj)
& +AMASS(I,J,bi,bj)/SEAICE_deltaTdyn*vIceNm1(I,J,bi,bj)
FORCEX(I,J,bi,bj)=FORCEX(I,J,bi,bj)*UVM(I,J,bi,bj)
FORCEY(I,J,bi,bj)=FORCEY(I,J,bi,bj)*UVM(I,J,bi,bj)
ENDDO
ENDDO
ENDDO
ENDDO
#ifdef SEAICE_LSRBNEW
DO bj=myByLo(myThid),myByHi(myThid)
DO bi=myBxLo(myThid),myBxHi(myThid)
C coefficients for matrices
DO j=1-OLy,sNy+OLy-1
DO i=1-OLx+1,sNx+OLx-1
etaU(I,J) = 0.5 _d 0 * (
& + eta(I,J,bi,bj) + eta(I-1,J,bi,bj) )
zetaU(I,J)= 0.5 _d 0 *(
& + zeta(I,J,bi,bj) + zeta(I-1,J,bi,bj) )
ENDDO
ENDDO
DO j=1-OLy+1,sNy+OLy-1
DO i=1-OLx,sNx+OLx-1
etaV(I,J) = 0.5 _d 0 * (
& + eta(I,J,bi,bj) + eta(I,J-1,bi,bj) )
zetaV(I,J)= 0.5 _d 0 *(
& + zeta(I,J,bi,bj) + zeta(I,J-1,bi,bj) )
ENDDO
ENDDO
C coefficients of uIce(I,J) and vIce(I,J) belonging to ...
DO J=1,sNy
DO I=0,sNx
C ... d/dx (eta+zeta) d/dx u
UXX(I,J) = _dyC(I,J,bi,bj) * (zetaV(I,J)+etaV(I,J))
& * _recip_dxG(I,J,bi,bj)
C ... d/dx (zeta-eta) k1 u
UXM(I,J) = _dyC(I,J,bi,bj) * (zetaV(I,J)-etaV(I,J))
& * k1AtV(I,J,bi,bj) * 0.5 _d 0
ENDDO
ENDDO
DO J=0,sNy
DO I=1,sNx
C ... d/dy eta d/dy u
UYY(I,J) = _dxC(I,J,bi,bj) * etaU(I,J)
& * _recip_dyG(I,J,bi,bj)
C ... d/dy eta k2 u
UYM(I,J) = _dxC(I,J,bi,bj) * etaU(I,J)
& * k2AtU(I,J,bi,bj) * 0.5 _d 0
ENDDO
ENDDO
DO J=1,sNy
DO I=0,sNx
C ... d/dx eta dv/dx
VXX(I,J) = _dyC(I,J,bi,bj) * etaV(I,J)
& * _recip_dxG(I,J,bi,bj)
C ... d/dx eta k1 v
VXM(I,J) = _dyC(I,J,bi,bj) * etaV(I,J)
& * k1AtV(I,J,bi,bj) * 0.5 _d 0
ENDDO
ENDDO
DO J=0,sNy
DO I=1,sNx
C ... d/dy eta+zeta dv/dy
VYY(I,J) = _dxC(I,J,bi,bj) * (zetaU(I,J)+etaU(I,J))
& * _recip_dyG(I,J,bi,bj)
C ... d/dy (zeta-eta) k2 v
VYM(I,J) = _dxC(I,J,bi,bj) * (zetaU(I,J)-etaU(I,J))
& * k2AtU(I,J,bi,bj) * 0.5 _d 0
ENDDO
ENDDO
C assemble coefficient matrix of uIce
C beware of sign convention: because this
C is the left hand side we calculate -grad(sigma), but the coefficients
C of U(I,J+/-1) are counted on the right hand side
DO J=1,sNy
DO I=1,sNx
C coefficients for uIce(I-1,J)
AU(I,J,bi,bj)= ( - UXX(I-1,J) + UXM(I-1,J) )
& * UVM(I,J,bi,bj)
C coefficients for uIce(I+1,J)
CU(I,J,bi,bj)= ( - UXX(I ,J) - UXM(I ,J) )
& * UVM(I,J,bi,bj)
C coefficients for uIce(I,J)
BU(I,J,bi,bj)=(ONE - UVM(I,J,bi,bj)) +
& ( UXX(I-1,J) + UXX(I,J) + UYY(I,J-1) + UYY(I,J)
& + UXM(I-1,J) - UXM(I,J) - UYM(I,J-1) + UYM(I,J)
& ) * UVM(I,J,bi,bj)
C coefficients of uIce(I,J-1)
uRt1(I,J,bi,bj)= UYY(I,J-1) + UYM(I,J-1)
C coefficients of uIce(I,J+1)
uRt2(I,J,bi,bj)= UYY(I,J ) - UYM(I,J )
ENDDO
ENDDO
C now we need to normalize everything by the grid cell area
DO J=1,sNy
DO I=1,sNx
AU(I,J,bi,bj) = AU(I,J,bi,bj) * recip_rAz(I,J,bi,bj)
CU(I,J,bi,bj) = CU(I,J,bi,bj) * recip_rAz(I,J,bi,bj)
C here we need add in the contribution from the time derivative
C and the symmetric drag term; must be done after normalizing
BU(I,J,bi,bj) = BU(I,J,bi,bj) * recip_rAz(I,J,bi,bj)
& + UVM(I,J,bi,bj) *
& ( AMASS(I,J,bi,bj)/SEAICE_deltaTdyn
& + DRAGS(I,J,bi,bj) )
uRt1(I,J,bi,bj) = uRt1(I,J,bi,bj) * recip_rAz(I,J,bi,bj)
uRt2(I,J,bi,bj) = uRt2(I,J,bi,bj) * recip_rAz(I,J,bi,bj)
ENDDO
ENDDO
C assemble coefficient matrix of vIce
C beware of sign convention: because this
C is the left hand side we calculate -grad(sigma), but the coefficients
C of V(I,J+/-1) are counted on the right hand side
DO J=1,sNy
DO I=1,sNx
C coefficients for vIce(I,J-1)
AV(I,J,bi,bj)=( - VYY(I,J-1) + VYM(I,J-1)
& ) * UVM(I,J,bi,bj)
C coefficients for vIce(I,J+1)
CV(I,J,bi,bj)=( - VYY(I,J ) - VYM(I,J )
& ) * UVM(I,J,bi,bj)
C coefficients for vIce(I,J)
BV(I,J,bi,bj)= (ONE - UVM(I,J,bi,bj)) +
& ( VXX(I,J) + VXX(I-1,J) + VYY(I,J) + VYY(I,J-1)
& + VXM(I,J) - VXM(I-1,J) - VYM(I,J) + VYM(I,J-1)
& ) * UVM(I,J,bi,bj)
C coefficients for V(I-1,J)
vRt1(I,J,bi,bj) = VXX(I-1,J) + VXM(I-1,J)
C coefficients for V(I+1,J)
vRt2(I,J,bi,bj) = VXX(I ,J) - VXM(I ,J)
ENDDO
ENDDO
C now we need to normalize everything by the grid cell area
DO J=1,sNy
DO I=1,sNx
AV(I,J,bi,bj) = AV(I,J,bi,bj) * recip_rAz(I,J,bi,bj)
CV(I,J,bi,bj) = CV(I,J,bi,bj) * recip_rAz(I,J,bi,bj)
C here we need add in the contribution from the time derivative
C and the symmetric drag term; must be done after normalizing
BV(I,J,bi,bj) = BV(I,J,bi,bj) * recip_rAz(I,J,bi,bj)
& + UVM(I,J,bi,bj) *
& ( AMASS(I,J,bi,bj)/SEAICE_deltaTdyn
& + DRAGS(I,J,bi,bj) )
vRt1(I,J,bi,bj) = vRt1(I,J,bi,bj) * recip_rAz(I,J,bi,bj)
vRt2(I,J,bi,bj) = vRt2(I,J,bi,bj) * recip_rAz(I,J,bi,bj)
ENDDO
ENDDO
C set up right-hand sides
DO j=1,sNy
DO i=0,sNx
C at V-point
sig11(I,J) =
& (zetaV(I,J)-etaV(I,J))
& * (vcLoc(I,J,bi,bj)-vcLoc(I,J-1,bi,bj))
& * _recip_dyC(I,J,bi,bj)
& + (zetaV(I,J)+etaV(I,J))*k2atV(I,J,bi,bj)
& * 0.5 _d 0 * (vIceB(I,J,bi,bj)+vIceB(I+1,J,bi,bj))
& - 0.5 _d 0 * (PRESS(I,J,bi,bj)+PRESS(I,J-1,bi,bj))
sig12(I,J) = etaV(I,J)
& * (ucLoc(I,J,bi,bj)-ucLoc(I,J-1,bi,bj))
& * _recip_dyC(I,J,bi,bj)
& - etaV(I,J) * k2AtV(I,J,bi,bj)
& * 0.5 _d 0 * (uIceB(I,J,bi,bj)+uIceB(I+1,J,bi,bj))
ENDDO
ENDDO
DO j=0,sNy
DO i=1,sNx
C at U-point
sig22(I,J) =
& (zetaU(I,J)-etaU(I,J))
& * (ucLoc(I,J,bi,bj)-ucLoc(I-1,J,bi,bj))
& * _recip_dxC(I,J,bi,bj)
& + (zetaU(I,J)+etaU(I,J))*k2atU(I,J,bi,bj)
& * 0.5 _d 0 * (uIceB(I,J,bi,bj)+uIceB(I,J+1,bi,bj))
& - 0.5 _d 0 * (PRESS(I,J,bi,bj)+PRESS(I-1,J,bi,bj))
sig21(I,J) = etaU(I,J)
& * (vcLoc(I,J,bi,bj)-vcLoc(I-1,J,bi,bj))
& * _recip_dxC(I,J,bi,bj)
& - etaU(I,J) * k1AtU(I,J,bi,bj)
& * 0.5 _d 0 * (vIceB(I,J,bi,bj)+vIceB(I,J+1,bi,bj))
ENDDO
ENDDO
DO j=1,sNy
DO i=1,sNx
rhsU(I,J,bi,bj) = DRAGA(I,J,bi,bj)*vIceB(I,J,bi,bj)
& +FORCEX(I,J,bi,bj)
& + ( _dyC(I, J, bi,bj) * sig11(I, J )
& - _dyC(I-1,J, bi,bj) * sig11(I-1,J )
& + _dxC(I, J, bi,bj) * sig21(I, J )
& - _dxC(I, J-1,bi,bj) * sig21(I, J-1) )
& * recip_rAz(I,J,bi,bj) * UVM(I,J,bi,bj)
rhsV(I,J,bi,bj) = - DRAGA(I,J,bi,bj)*uIceB(I,J,bi,bj)
& +FORCEY(I,J,bi,bj)
& + ( _dyC(I, J, bi,bj) * sig12(I, J )
& - _dyC(I-1,J, bi,bj) * sig12(I-1,J )
& + _dxC(I, J, bi,bj) * sig22(I, J )
& - _dxC(I, J-1,bi,bj) * sig22(I, J-1) )
& * recip_rAz(I,J,bi,bj) * UVM(I,J,bi,bj)
ENDDO
ENDDO
C bi/bj-loops
ENDDO
ENDDO
C NOW DO ITERATION
doIterate4u = .TRUE.
doIterate4v = .TRUE.
C ITERATION START -----------------------------------------------------
DO m = 1, SEAICElinearIterMax
IF ( doIterate4u .OR. doIterate4v ) THEN
IF ( useCubedSphereExchange ) THEN
doIterate4u = .TRUE.
doIterate4v = .TRUE.
ENDIF
DO bj=myByLo(myThid),myByHi(myThid)
DO bi=myBxLo(myThid),myBxHi(myThid)
C-jmc: get less TAF warnings when always (no if doIterate) saving uIce,vIce:
C save uIce prior to iteration, NOW SET U(3)=U(1)
DO j=1-OLy,sNy+OLy
DO i=1-OLx,sNx+OLx
uTmp(I,J,bi,bj)=uIce(I,J,bi,bj)
ENDDO
ENDDO
C save vIce prior to iteration, NOW SET V(3)=V(1)
DO j=1-OLy,sNy+OLy
DO i=1-OLx,sNx+OLx
vTmp(I,J,bi,bj)=vIce(I,J,bi,bj)
ENDDO
ENDDO
IF ( doIterate4u ) THEN
C Solve for uIce :
DO J=1,sNy
DO I=1,sNx
AA3 = ZERO
IF (I.EQ.1) AA3 = AA3 - AU(I,J,bi,bj)*uIce(I-1,J,bi,bj)
IF (I.EQ.sNx) AA3 = AA3 - CU(I,J,bi,bj)*uIce(I+1,J,bi,bj)
URT(I,J)=rhsU(I,J,bi,bj)
& + AA3
#ifdef SEAICE_VECTORIZE_LSR
& + uRt1(I,J,bi,bj)*uTmp(I,J-1,bi,bj)
& + uRt2(I,J,bi,bj)*uTmp(I,J+1,bi,bj)
#else
& + uRt1(I,J,bi,bj)*uIce(I,J-1,bi,bj)
& + uRt2(I,J,bi,bj)*uIce(I,J+1,bi,bj)
#endif /* SEAICE_VECTORIZE_LSR */
URT(I,J)=URT(I,J)* UVM(I,J,bi,bj)
ENDDO
DO I=1,sNx
CUU(I,J)=CU(I,J,bi,bj)
ENDDO
CUU(1,J)=CUU(1,J)/BU(1,J,bi,bj)
URT(1,J)=URT(1,J)/BU(1,J,bi,bj)
#ifdef SEAICE_VECTORIZE_LSR
ENDDO
C start a new loop with reversed order to support automatic vectorization
DO I=2,sNx
IM=I-1
DO J=1,sNy
#else /* do not SEAICE_VECTORIZE_LSR */
DO I=2,sNx
IM=I-1
#endif /* SEAICE_VECTORIZE_LSR */
CUU(I,J)=CUU(I,J)/(BU(I,J,bi,bj)-AU(I,J,bi,bj)*CUU(IM,J))
URT(I,J)=(URT(I,J)-AU(I,J,bi,bj)*URT(IM,J))
& /(BU(I,J,bi,bj)-AU(I,J,bi,bj)*CUU(IM,J))
ENDDO
#ifdef SEAICE_VECTORIZE_LSR
ENDDO
C go back to original order
DO J=1,sNy
#endif /* SEAICE_VECTORIZE_LSR */
DO I=1,sNx-1
J1=sNx-I
J2=J1+1
URT(J1,J)=URT(J1,J)-CUU(J1,J)*URT(J2,J)
ENDDO
DO I=1,sNx
uIce(I,J,bi,bj)=uTmp(I,J,bi,bj)
& +WFAU*(URT(I,J)-uTmp(I,J,bi,bj))
ENDDO
ENDDO
C-- end doIterate4u
ENDIF
IF ( doIterate4v ) THEN
C Solve for vIce
DO I=1,sNx
DO J=1,sNy
AA3 = ZERO
IF (J.EQ.1) AA3 = AA3 - AV(I,J,bi,bj)*vIce(I,J-1,bi,bj)
IF (J.EQ.sNy) AA3 = AA3 - CV(I,J,bi,bj)*vIce(I,J+1,bi,bj)
VRT(I,J)=rhsV(I,J,bi,bj)
& + AA3
#ifdef SEAICE_VECTORIZE_LSR
& + vRt1(I,J,bi,bj)*vTmp(I-1,J,bi,bj)
& + vRt2(I,J,bi,bj)*vTmp(I+1,J,bi,bj)
#else
& + vRt1(I,J,bi,bj)*vIce(I-1,J,bi,bj)
& + vRt2(I,J,bi,bj)*vIce(I+1,J,bi,bj)
#endif /* SEAICE_VECTORIZE_LSR */
VRT(I,J)=VRT(I,J)* UVM(I,J,bi,bj)
ENDDO
DO J=1,sNy
CVV(I,J)=CV(I,J,bi,bj)
ENDDO
CVV(I,1)=CVV(I,1)/BV(I,1,bi,bj)
VRT(I,1)=VRT(I,1)/BV(I,1,bi,bj)
DO J=2,sNy
JM=J-1
CVV(I,J)=CVV(I,J)/(BV(I,J,bi,bj)-AV(I,J,bi,bj)*CVV(I,JM))
VRT(I,J)=(VRT(I,J)-AV(I,J,bi,bj)*VRT(I,JM))
& /(BV(I,J,bi,bj)-AV(I,J,bi,bj)*CVV(I,JM))
ENDDO
DO J=1,sNy-1
J1=sNy-J
J2=J1+1
VRT(I,J1)=VRT(I,J1)-CVV(I,J1)*VRT(I,J2)
ENDDO
DO J=1,sNy
vIce(I,J,bi,bj)=vTmp(I,J,bi,bj)
& +WFAV*(VRT(I,J)-vTmp(I,J,bi,bj))
ENDDO
ENDDO
C-- end doIterate4v
ENDIF
C end bi,bj-loops
ENDDO
ENDDO
IF ( doIterate4u.AND.MOD(m,SOLV_NCHECK).EQ.0) THEN
S1=ZERO
DO bj=myByLo(myThid),myByHi(myThid)
DO bi=myBxLo(myThid),myBxHi(myThid)
DO J=1,sNy
DO I=1,sNx
UERR=(uIce(I,J,bi,bj)-uTmp(I,J,bi,bj))
& * UVM(I,J,bi,bj)
S1=MAX(ABS(UERR),S1)
ENDDO
ENDDO
ENDDO
ENDDO
_GLOBAL_MAX_RL( S1, myThid )
c WRITE(standardMessageUnit,'(A,2I6,1P4E16.9)')
c & ' U iters,error,WF = ',ilcall,M,S1,S1A,WFAU
C SAFEGUARD AGAINST BAD FORCING ETC
IF(m.GT.1.AND.S1.GT.S1A) WFAU=WFAU2
S1A=S1
IF(S1.LT.LSR_ERROR) THEN
ICOUNT1=m
doIterate4u = .FALSE.
ENDIF
ENDIF
IF ( doIterate4v.AND.MOD(m,SOLV_NCHECK).EQ.0) THEN
S2=ZERO
DO bj=myByLo(myThid),myByHi(myThid)
DO bi=myBxLo(myThid),myBxHi(myThid)
DO J=1,sNy
DO I=1,sNx
UERR=(vIce(I,J,bi,bj)-vTmp(I,J,bi,bj))
& * UVM(I,J,bi,bj)
S2=MAX(ABS(UERR),S2)
ENDDO
ENDDO
ENDDO
ENDDO
_GLOBAL_MAX_RL( S2, myThid )
C SAFEGUARD AGAINST BAD FORCING ETC
IF(m.GT.1.AND.S2.GT.S2A) WFAV=WFAV2
S2A=S2
IF(S2.LT.LSR_ERROR) THEN
ICOUNT2=m
doIterate4v = .FALSE.
ENDIF
ENDIF
CALL EXCH_UV_XY_RL( uIce, vIce,.TRUE.,myThid)
C-- end doIterate4u or doIterate4v
ENDIF
ENDDO
C ITERATION END -----------------------------------------------------
#ifdef ALLOW_DEBUG
IF ( debugLevel .GE. debLevD ) THEN
WRITE(msgBuf,'(A,I3,A)')
& 'Uice post iter (SEAICE_LSR', MOD(ilcall,1000), ')'
CALL DEBUG_STATS_RL( 1, uIce, msgBuf, myThid )
WRITE(msgBuf,'(A,I3,A)')
& 'Vice post iter (SEAICE_LSR', MOD(ilcall,1000), ')'
CALL DEBUG_STATS_RL( 1, vIce, msgBuf, myThid )
ENDIF
#endif /* ALLOW_DEBUG */
IF ( doIterate4u .OR. doIterate4v ) THEN
WRITE(msgBuf,'(2A,I10,A,I4,A)') '** WARNING ** SEAICE_LSR ',
& '(it=', -9999, ',', ilcall,') did not converge :'
CALL PRINT_MESSAGE( msgBuf, errorMessageUnit,
& SQUEEZE_RIGHT, myThid )
WRITE(msgBuf,'(2(A,I6,0PF6.3,1PE14.6))')
& ' nIt,wFU,dU=', ICOUNT1, WFAU, S1,
& ' ; nIt,wFV,dV=', ICOUNT2, WFAV, S2
CALL PRINT_MESSAGE( msgBuf, errorMessageUnit,
& SQUEEZE_RIGHT, myThid )
ENDIF
#else /* SEAICE_LSRBNEW */
C SOLVE FOR UICE
#ifdef ALLOW_AUTODIFF_TAMC
cph That is an important one! Note, that
cph * lsr is called twice, thus the icall index
cph * this storing is still outside the iteration loop
CADJ STORE uice = comlev1_dynsol,
CADJ & key = ikey_dynamics + (ilcall-1)*nchklev_1
CADJ STORE vice = comlev1_dynsol,
CADJ & key = ikey_dynamics + (ilcall-1)*nchklev_1
#endif /* ALLOW_AUTODIFF_TAMC */
DO bj=myByLo(myThid),myByHi(myThid)
DO bi=myBxLo(myThid),myBxHi(myThid)
DO j=1-OLy,sNy+OLy
DO i=1-OLx,sNx+OLx
etaPlusZeta(I,J,bi,bj) = ETA(I,J,bi,bj)+ZETA(I,J,bi,bj)
zetaMinusEta(I,J,bi,bj) = ZETA(I,J,bi,bj)-ETA(I,J,bi,bj)
ENDDO
ENDDO
DO j=1-OLy+1,sNy+OLy
DO i=1-OLx+1,sNx+OLx
ETAMEAN(I,J,bi,bj) =QUART*(
& ETA(I,J-1,bi,bj) + ETA(I-1,J-1,bi,bj)
& +ETA(I,J ,bi,bj) + ETA(I-1,J ,bi,bj))
ZETAMEAN(I,J,bi,bj)=QUART*(
& ZETA(I,J-1,bi,bj) + ZETA(I-1,J-1,bi,bj)
& +ZETA(I,J ,bi,bj) + ZETA(I-1,J ,bi,bj))
ENDDO
ENDDO
ENDDO
ENDDO
DO bj=myByLo(myThid),myByHi(myThid)
DO bi=myBxLo(myThid),myBxHi(myThid)
DO J=1,sNy
DO I=1,sNx
AA1=( etaPlusZeta(I ,J-1,bi,bj) * _recip_dxF(I ,J-1,bi,bj)
& +etaPlusZeta(I ,J ,bi,bj) * _recip_dxF(I ,J ,bi,bj)
& )*0.5 _d 0 * _recip_dxV(I,J,bi,bj) * UVM(I,J,bi,bj)
AA2=( etaPlusZeta(I-1,J-1,bi,bj) * _recip_dxF(I-1,J-1,bi,bj)
& +etaPlusZeta(I-1,J ,bi,bj) * _recip_dxF(I-1,J ,bi,bj)
& )*0.5 _d 0 * _recip_dxV(I,J,bi,bj) * UVM(I,J,bi,bj)
AA3= 0.5 _d 0 *(ETA(I-1,J ,bi,bj)+ETA(I,J ,bi,bj))
AA4= 0.5 _d 0 *(ETA(I-1,J-1,bi,bj)+ETA(I,J-1,bi,bj))
AA5= -(AA3-AA4) * _tanPhiAtV(I,J,bi,bj)
& * _recip_dyU(I,J,bi,bj)*recip_rSphere
AA6=TWO*ETAMEAN(I,J,bi,bj) *recip_rSphere*recip_rSphere
& * _tanPhiAtV(I,J,bi,bj) * _tanPhiAtV(I,J,bi,bj)
AU(I,J,bi,bj)=-AA2
CU(I,J,bi,bj)=-AA1
BU(I,J,bi,bj)=(ONE-UVM(I,J,bi,bj))
& - AU(I,J,bi,bj) - CU(I,J,bi,bj)
& + ((AA3+AA4)*_recip_dyU(I,J,bi,bj)*_recip_dyU(I,J,bi,bj)
& + AA5 + AA6
& + AMASS(I,J,bi,bj)/SEAICE_deltaTdyn
& + DRAGS(I,J,bi,bj)
& )*UVM(I,J,bi,bj)
END DO
END DO
DO J=1,sNy
AU(1,J,bi,bj)=ZERO
CU(sNx,J,bi,bj)=ZERO
CU(1,J,bi,bj)=CU(1,J,bi,bj)/BU(1,J,bi,bj)
END DO
C now set up right-hand side
DO J=1-OLy,sNy+OLy-1
DO I=1-OLx,sNx+OLx-1
dVdy(I,J) = 0.5 _d 0 * (
& ( vIceB(I+1,J+1,bi,bj) - vIceB(I+1,J ,bi,bj) )
& * _recip_dyG(I+1,J,bi,bj)
& +(vIceB(I ,J+1,bi,bj) - vIceB(I ,J ,bi,bj) )
& * _recip_dyG(I, J,bi,bj) )
dVdx(I,J) = 0.5 _d 0 * (
& ( vIceB(I+1,J+1,bi,bj) - vIceB(I ,J+1,bi,bj) )
& * _recip_dxG(I,J+1,bi,bj)
& +(vIceB(I+1,J ,bi,bj) - vIceB(I ,J ,bi,bj) )
& * _recip_dxG(I,J, bi,bj) )
ENDDO
ENDDO
#ifdef SEAICE_TEST
DO j=1-OLy,sNy+OLy-1
DO i=1-OLx,sNx+OLx-1
vz(i,j) = quart * (
& vIceB(i,j,bi,bj) + vIceB(i+1,j,bi,bj) )
vz(i,j)= vz(i,j) + quart * (
& vIceB(i,j+1,bi,bj) + vIceB(i+1,j+1,bi,bj) )
ENDDO
ENDDO
#endif
DO J=1,sNy
DO I=1,sNx
rhsU(I,J,bi,bj)=DRAGA(I,J,bi,bj)*vIceB(I,J,bi,bj)
& +FORCEX(I,J,bi,bj)
#ifdef SEAICE_TEST
& + ( 0.5 _d 0 *
& (zetaMinusEta(i,j,bi,bj)+zetaMinusEta(i,j-1,bi,bj))
& *(vz(i,j)-vz(i,j-1)) * _recip_dyC(i,j,bi,bj)
& - 0.5 _d 0 *
& (zetaMinusEta(i-1,j,bi,bj)+zetaMinusEta(i-1,j-1,bi,bj))
& *(vz(i-1,j)-vz(i-1,j-1)) * _recip_dyC(i-1,j,bi,bj)
& ) * _recip_dxV(i,j,bi,bj)
#else
& + ( zetaMinusEta(I ,J ,bi,bj) * dVdy(I ,J )
& + zetaMinusEta(I ,J-1,bi,bj) * dVdy(I ,J-1)
& - zetaMinusEta(I-1,J ,bi,bj) * dVdy(I-1,J )
& - zetaMinusEta(I-1,J-1,bi,bj) * dVdy(I-1,J-1)
& )* 0.5 _d 0 * _recip_dxV(I,J,bi,bj)
#endif
&
& + ( ETA (I ,J ,bi,bj) * dVdx(I ,J )
& + ETA (I-1,J ,bi,bj) * dVdx(I-1,J )
& - ETA (I ,J-1,bi,bj) * dVdx(I ,J-1)
& - ETA (I-1,J-1,bi,bj) * dVdx(I-1,J-1)
& ) * 0.5 _d 0 * _recip_dyU(I,J,bi,bj)
&
& -(etaPlusZeta(I ,J ,bi,bj)+etaPlusZeta(I ,J-1,bi,bj)
& -etaPlusZeta(I-1,J-1,bi,bj)-etaPlusZeta(I-1,J ,bi,bj))
& * vIceB(I,J,bi,bj)
& * _tanPhiAtV(I,J,bi,bj)
& * 0.5 _d 0 * _recip_dxV(I,J,bi,bj)*recip_rSphere
&
& -(ETAMEAN(I,J,bi,bj)+ZETAMEAN(I,J,bi,bj))
& *(vIceB(I+1,J,bi,bj) - vIceB(I-1,J,bi,bj))
& * _tanPhiAtV(I,J,bi,bj)
& * 1.0 _d 0 /( _dxG(I,J,bi,bj) + _dxG(I-1,J,bi,bj) )
& *recip_rSphere
&
& -ETAMEAN(I,J,bi,bj)
& *(vIceB(I+1,J,bi,bj) - vIceB(I-1,J,bi,bj))
& *TWO* _tanPhiAtV(I,J,bi,bj)
& * 1.0 _d 0 /( _dxG(I,J,bi,bj) + _dxG(I-1,J,bi,bj) )
& *recip_rSphere
URT1(I,J,bi,bj)=
& 0.5 _d 0 * (ETA(I-1,J-1,bi,bj)+ETA(I,J-1,bi,bj))
& * _recip_dyU(I,J,bi,bj) * _recip_dyU(I,J,bi,bj)
& - ETAMEAN(I,J,bi,bj) * _tanPhiAtV(I,J-1,bi,bj)
& * 0.5 _d 0 * _recip_dyU(I,J,bi,bj)*recip_rSphere
& + TWO*ETAMEAN(I,J,bi,bj) * _tanPhiAtV(I,J,bi,bj)
& * 0.5 _d 0 * _recip_dyU(I,J,bi,bj)*recip_rSphere
URT2(I,J,bi,bj)=
& 0.5 _d 0 * (ETA(I-1,J,bi,bj)+ETA(I,J,bi,bj))
& * _recip_dyU(I,J,bi,bj) * _recip_dyU(I,J,bi,bj)
& + ETAMEAN(I,J,bi,bj) * _tanPhiAtV(I,J+1,bi,bj)
& * 0.5 _d 0 * _recip_dyU(I,J,bi,bj)*recip_rSphere
& - TWO*ETAMEAN(I,J,bi,bj) * _tanPhiAtV(I,J,bi,bj)
& * 0.5 _d 0 * _recip_dyU(I,J,bi,bj)*recip_rSphere
END DO
END DO
ENDDO
ENDDO
C NOW DO ITERATION
cph--- iteration starts here
cph--- need to kick out goto
phexit = -1
C ITERATION START -----------------------------------------------------
#ifdef ALLOW_AUTODIFF_TAMC
CADJ LOOP = iteration uice
#endif /* ALLOW_AUTODIFF_TAMC */
DO M=1, SEAICElinearIterMax
IF ( phexit .EQ. -1 ) THEN
DO bj=myByLo(myThid),myByHi(myThid)
DO bi=myBxLo(myThid),myBxHi(myThid)
C NOW SET U(3)=U(1)
DO J=1,sNy
DO I=1,sNx
UTMP(I,J,bi,bj)=UICE(I,J,bi,bj)
END DO
END DO
DO J=1,sNy
DO I=1,sNx
IF(I.EQ.1) THEN
AA2=(etaPlusZeta(I-1,J-1,bi,bj) * _recip_dxF(I-1,J-1,bi,bj)
& +etaPlusZeta(I-1,J ,bi,bj) * _recip_dxF(I-1,J ,bi,bj)
& )*0.5 _d 0 * _recip_dxV(I,J,bi,bj)
AA3=AA2*UICE(I-1,J,bi,bj)*UVM(I,J,bi,bj)
ELSE IF(I.EQ.sNx) THEN
AA1=(etaPlusZeta(I ,J-1,bi,bj) * _recip_dxF(I ,J-1,bi,bj)
& +etaPlusZeta(I ,J ,bi,bj) * _recip_dxF(I ,J ,bi,bj)
& )*0.5 _d 0 * _recip_dxV(I,J,bi,bj)
AA3=AA1*UICE(I+1,J,bi,bj)*UVM(I,J,bi,bj)
ELSE
AA3=ZERO
END IF
URT(I)=rhsU(I,J,bi,bj)+AA3
& +URT1(I,J,bi,bj)*UICE(I,J-1,bi,bj)
& +URT2(I,J,bi,bj)*UICE(I,J+1,bi,bj)
URT(I)=URT(I)*UVM(I,J,bi,bj)
END DO
DO I=1,sNx
CUU(I)=CU(I,J,bi,bj)
END DO
URT(1)=URT(1)/BU(1,J,bi,bj)
DO I=2,sNx
IM=I-1
CUU(I)=CUU(I)/(BU(I,J,bi,bj)-AU(I,J,bi,bj)*CUU(IM))
URT(I)=(URT(I)-AU(I,J,bi,bj)*URT(IM))
& /(BU(I,J,bi,bj)-AU(I,J,bi,bj)*CUU(IM))
END DO
DO I=1,sNx-1
J1=sNx-I
J2=J1+1
URT(J1)=URT(J1)-CUU(J1)*URT(J2)
END DO
DO I=1,sNx
UICE(I,J,bi,bj)=UTMP(I,J,bi,bj)
& +WFAU*(URT(I)-UTMP(I,J,bi,bj))
END DO
END DO
ENDDO
ENDDO
IF(MOD(M,SOLV_NCHECK).EQ.0) THEN
S1=ZERO
DO bj=myByLo(myThid),myByHi(myThid)
DO bi=myBxLo(myThid),myBxHi(myThid)
DO J=1,sNy
DO I=1,sNx
UERR=(UICE(I,J,bi,bj)-UTMP(I,J,bi,bj))
& *UVM(I,J,bi,bj)
S1=MAX(ABS(UERR),S1)
END DO
END DO
ENDDO
ENDDO
_GLOBAL_MAX_RL( S1, myThid )
C SAFEGUARD AGAINST BAD FORCING ETC
IF(M.GT.1.AND.S1.GT.S1A) WFAU=WFAU2
S1A=S1
IF(S1.LT.LSR_ERROR) THEN
ICOUNT1=M
phexit = 1
END IF
END IF
_EXCH_XY_RL( UICE, myThid )
ENDIF
ENDDO
C ITERATION END -----------------------------------------------------
IF ( debugLevel .GE. debLevC ) THEN
_BEGIN_MASTER( myThid )
write(*,'(A,I6,1P2E22.14)')' U lsr iters, error = ',ICOUNT1,S1
_END_MASTER( myThid )
ENDIF
C NOW FOR VICE
DO bj=myByLo(myThid),myByHi(myThid)
DO bi=myBxLo(myThid),myBxHi(myThid)
DO J=1,sNy
DO I=1,sNx
AA1=0.5 _d 0 * _recip_dyU(I,J,bi,bj) * _recip_dyU(I,J,bi,bj)
& * (etaPlusZeta(I-1,J ,bi,bj) + etaPlusZeta(I,J ,bi,bj))
AA2=0.5 _d 0 * _recip_dyU(I,J,bi,bj) * _recip_dyU(I,J,bi,bj)
& * (etaPlusZeta(I-1,J-1,bi,bj) + etaPlusZeta(I,J-1,bi,bj))
AA3= (ETA(I ,J-1,bi,bj) * _recip_dxV(I,J,bi,bj)
& +ETA(I ,J ,bi,bj) * _recip_dxV(I,J,bi,bj)
& )* 0.5 _d 0 * _recip_dxV(I,J,bi,bj)
AA4= (ETA(I-1,J-1,bi,bj)+ETA(I-1,J,bi,bj))*0.5 _d 0
& *_recip_dxV(I,J,bi,bj) * _recip_dxV(I,J,bi,bj)
AA5=(zetaMinusEta(I-1,J ,bi,bj) + zetaMinusEta(I,J ,bi,bj)
& -zetaMinusEta(I-1,J-1,bi,bj) - zetaMinusEta(I,J-1,bi,bj)
& )* _tanPhiAtV(I,J,bi,bj)
& * 0.5 _d 0 * _recip_dyU(I,J,bi,bj)*recip_rSphere
AA6=TWO*ETAMEAN(I,J,bi,bj) * recip_rSphere*recip_rSphere
& * _tanPhiAtV(I,J,bi,bj) * _tanPhiAtV(I,J,bi,bj)
AV(I,J,bi,bj)=(
& - AA2
& - (ZETAMEAN(I,J,bi,bj)-ETAMEAN(I,J,bi,bj))
& * _tanPhiAtV(I,J-1,bi,bj)
& * 0.5 _d 0 * _recip_dyU(I,J,bi,bj)*recip_rSphere
& -ETAMEAN(I,J,bi,bj)*TWO* _tanPhiAtV(I,J,bi,bj)
& * 0.5 _d 0 * _recip_dyU(I,J,bi,bj)*recip_rSphere
& )*UVM(I,J,bi,bj)
CV(I,J,bi,bj)=(
& -AA1
& +(ZETAMEAN(I,J,bi,bj)-ETAMEAN(I,J,bi,bj))
& * _tanPhiAtV(I,J+1,bi,bj)
& * 0.5 _d 0 * _recip_dyU(I,J,bi,bj)*recip_rSphere
& +ETAMEAN(I,J,bi,bj)*TWO* _tanPhiAtV(I,J,bi,bj)
& * 0.5 _d 0 * _recip_dyU(I,J,bi,bj)*recip_rSphere
& )*UVM(I,J,bi,bj)
BV(I,J,bi,bj)= (ONE-UVM(I,J,bi,bj))
& +( (AA1+AA2) + (AA3+AA4) + AA5 + AA6
& +AMASS(I,J,bi,bj)/SEAICE_deltaTdyn+DRAGS(I,J,bi,bj))
& *UVM(I,J,bi,bj)
END DO
END DO
DO I=1,sNx
AV(I,1,bi,bj)=ZERO
CV(I,sNy,bi,bj)=ZERO
CV(I,1,bi,bj)=CV(I,1,bi,bj)/BV(I,1,bi,bj)
END DO
C now set up right-hand-side
DO J=1-OLy,sNy+OLy-1
DO I=1-OLx,sNx+OLx-1
dUdx(I,J) = 0.5 _d 0 * (
& ( uIceB(I+1,J+1,bi,bj) - uIceB(I ,J+1,bi,bj) )
& * _recip_dxG(I,J+1,bi,bj)
& +(uIceB(I+1,J ,bi,bj) - uIceB(I ,J ,bi,bj) )
& * _recip_dxG(I,J ,bi,bj) )
dUdy(I,J) = 0.5 _d 0 * (
& ( uIceB(I+1,J+1,bi,bj) - uIceB(I+1,J ,bi,bj) )
& * _recip_dyG(I+1,J,bi,bj)
& +(uIceB(I ,J+1,bi,bj) - uIceB(I ,J ,bi,bj) )
& * _recip_dyG(I, J,bi,bj) )
ENDDO