model/src/solve_for_pressure.F

C $Header: /u/gcmpack/models/MITgcmUV/model/src/solve_for_pressure.F,v 1.23 2001/06/06 14:55:45 adcroft Exp $
C $Name:  $

#include "CPP_OPTIONS.h"

CStartOfInterface
      SUBROUTINE SOLVE_FOR_PRESSURE( myThid )
C     /==========================================================\
C     | SUBROUTINE SOLVE_FOR_PRESSURE                            |
C     | o Controls inversion of two and/or three-dimensional     |
C     |   elliptic problems for the pressure field.              |
C     \==========================================================/
      IMPLICIT NONE

C     == Global variables
#include "SIZE.h"
#include "EEPARAMS.h"
#include "PARAMS.h"
#include "DYNVARS.h"
#include "GRID.h"
#include "SURFACE.h"
#ifdef ALLOW_NONHYDROSTATIC
#include "CG3D.h"
#include "GW.h"
#endif
#ifdef ALLOW_OBCS
#include "OBCS.h"
#endif
#include "SOLVE_FOR_PRESSURE.h"

C     == Routine arguments ==
C     myThid - Number of this instance of SOLVE_FOR_PRESSURE
      INTEGER myThid
CEndOfInterface

C     == Local variables ==
      INTEGER i,j,k,bi,bj
      _RS uf(1-Olx:sNx+Olx,1-Oly:sNy+Oly)
      _RS vf(1-Olx:sNx+Olx,1-Oly:sNy+Oly)
      _RL firstResidual,lastResidual
      INTEGER numIters

C--   Save previous solution & Initialise Vector solution and source term :
      DO bj=myByLo(myThid),myByHi(myThid)
       DO bi=myBxLo(myThid),myBxHi(myThid)
        DO j=1-OLy,sNy+OLy
         DO i=1-OLx,sNx+OLx
          etaNm1(i,j,bi,bj) = etaN(i,j,bi,bj)
          cg2d_x(i,j,bi,bj) = Bo_surf(i,j,bi,bj)*etaN(i,j,bi,bj)
          cg2d_b(i,j,bi,bj) = 0.
#ifdef USE_NATURAL_BCS
     &     + freeSurfFac*_rA(i,j,bi,bj)*
     &       EmPmR(I,J,bi,bj)/deltaTMom
#endif
         ENDDO
        ENDDO
       ENDDO
      ENDDO

      DO bj=myByLo(myThid),myByHi(myThid)
       DO bi=myBxLo(myThid),myBxHi(myThid)
        DO K=Nr,1,-1
         DO j=1,sNy+1
          DO i=1,sNx+1
           uf(i,j) = _dyG(i,j,bi,bj)
     &      *drF(k)*_hFacW(i,j,k,bi,bj)
           vf(i,j) = _dxG(i,j,bi,bj)
     &      *drF(k)*_hFacS(i,j,k,bi,bj)
          ENDDO
         ENDDO
         CALL CALC_DIV_GHAT(
     I       bi,bj,1,sNx,1,sNy,K,
     I       uf,vf,
     U       cg2d_b,
     I       myThid)
        ENDDO
       ENDDO
      ENDDO

C--   Add source term arising from w=d/dt (p_s + p_nh)
      DO bj=myByLo(myThid),myByHi(myThid)
       DO bi=myBxLo(myThid),myBxHi(myThid)
#ifdef ALLOW_NONHYDROSTATIC
        DO j=1,sNy
         DO i=1,sNx
          cg2d_b(i,j,bi,bj) = cg2d_b(i,j,bi,bj)
     &      -freeSurfFac*_rA(i,j,bi,bj)/deltaTMom/deltaTMom
     &        *( etaN(i,j,bi,bj)
     &          +cg3d_x(i,j,1,bi,bj)*horiVertRatio/gravity )
          cg3d_b(i,j,1,bi,bj) = cg3d_b(i,j,1,bi,bj)
     &      -freeSurfFac*_rA(i,j,bi,bj)/deltaTMom/deltaTMom
     &        *( etaN(i,j,bi,bj)
     &          +cg3d_x(i,j,1,bi,bj)*horiVertRatio/gravity )
C-jmc
c    &      -freeSurfFac*_rA(i,j,bi,bj)*recip_Bo(i,j,bi,bj)
c    &        *( cg2d_x(i,j,bi,bj) + cg3d_x(i,j,1,bi,bj) )
c    &        /deltaTMom/deltaTMom
C-jmc
         ENDDO
        ENDDO
#else
        DO j=1,sNy
         DO i=1,sNx
          cg2d_b(i,j,bi,bj) = cg2d_b(i,j,bi,bj)
     &      -freeSurfFac*_rA(i,j,bi,bj)/deltaTMom/deltaTMom
     &        * etaN(i,j,bi,bj)
         ENDDO
        ENDDO
#endif

#ifdef ALLOW_OBCS
        IF (useOBCS) THEN
         DO i=1,sNx
C Northern boundary
          IF (OB_Jn(I,bi,bj).NE.0) THEN
           cg2d_b(I,OB_Jn(I,bi,bj),bi,bj)=0.
          ENDIF
C Southern boundary
          IF (OB_Js(I,bi,bj).NE.0) THEN
           cg2d_b(I,OB_Js(I,bi,bj),bi,bj)=0.
          ENDIF
         ENDDO
         DO j=1,sNy
C Eastern boundary
          IF (OB_Ie(J,bi,bj).NE.0) THEN
           cg2d_b(OB_Ie(J,bi,bj),J,bi,bj)=0.
          ENDIF
C Western boundary
          IF (OB_Iw(J,bi,bj).NE.0) THEN
           cg2d_b(OB_Iw(J,bi,bj),J,bi,bj)=0.
          ENDIF
         ENDDO
        ENDIF
#endif
       ENDDO
      ENDDO

#ifndef EXCLUDE_DEBUGMODE
      IF (debugMode) THEN
       CALL DEBUG_STATS_RL(1,cg2d_b,'cg2d_b (SOLVE_FOR_PRESSURE)',
     &                        myThid)
      ENDIF
#endif

C--   Find the surface pressure using a two-dimensional conjugate
C--   gradient solver.
C     see CG2D.h for the interface to this routine.
      firstResidual=0.
      lastResidual=0.
      numIters=cg2dMaxIters
      CALL CG2D(
     U           cg2d_b,
     U           cg2d_x,
     O           firstResidual,
     O           lastResidual,
     U           numIters,
     I           myThid )
      _EXCH_XY_R8(cg2d_x, myThid )

#ifndef EXCLUDE_DEBUGMODE
      IF (debugMode) THEN
       CALL DEBUG_STATS_RL(1,cg2d_x,'cg2d_x (SOLVE_FOR_PRESSURE)',
     &                        myThid)
      ENDIF
#endif

      _BEGIN_MASTER( myThid )
       WRITE(*,'(A,I6,1PE30.14)') ' CG2D iters, err = ',
     &                               0, firstResidual
       WRITE(*,'(A,I6,1PE30.14)') ' CG2D iters, err = ',
     &                         numIters, lastResidual
      _END_MASTER( )

C--   Transfert the 2D-solution to "etaN" :
      DO bj=myByLo(myThid),myByHi(myThid)
       DO bi=myBxLo(myThid),myBxHi(myThid)
        DO j=1-OLy,sNy+OLy
         DO i=1-OLx,sNx+OLx
          etaN(i,j,bi,bj) = recip_Bo(i,j,bi,bj)*cg2d_x(i,j,bi,bj)
         ENDDO
        ENDDO
       ENDDO
      ENDDO

#ifdef ALLOW_NONHYDROSTATIC
      IF ( nonHydrostatic ) THEN

C--   Solve for a three-dimensional pressure term (NH or IGW or both ).
C     see CG3D.h for the interface to this routine.
       DO bj=myByLo(myThid),myByHi(myThid)
        DO bi=myBxLo(myThid),myBxHi(myThid)
         DO j=1,sNy+1
          DO i=1,sNx+1
           uf(i,j)=-_recip_dxC(i,j,bi,bj)*
     &         (cg2d_x(i,j,bi,bj)-cg2d_x(i-1,j,bi,bj))
           vf(i,j)=-_recip_dyC(i,j,bi,bj)*
     &         (cg2d_x(i,j,bi,bj)-cg2d_x(i,j-1,bi,bj))
          ENDDO
         ENDDO

#ifdef ALLOW_OBCS
         IF (useOBCS) THEN
          DO i=1,sNx+1
C Northern boundary
          IF (OB_Jn(I,bi,bj).NE.0) THEN
           vf(I,OB_Jn(I,bi,bj))=0.
          ENDIF
C Southern boundary
          IF (OB_Js(I,bi,bj).NE.0) THEN
           vf(I,OB_Js(I,bi,bj)+1)=0.
          ENDIF
          ENDDO
          DO j=1,sNy+1
C Eastern boundary
          IF (OB_Ie(J,bi,bj).NE.0) THEN
           uf(OB_Ie(J,bi,bj),J)=0.
          ENDIF
C Western boundary
          IF (OB_Iw(J,bi,bj).NE.0) THEN
           uf(OB_Iw(J,bi,bj)+1,J)=0.
          ENDIF
          ENDDO
         ENDIF
#endif

         K=1
         DO j=1,sNy
          DO i=1,sNx
           cg3d_b(i,j,k,bi,bj) = cg3d_b(i,j,k,bi,bj)
     &       +dRF(K)*dYG(i+1,j,bi,bj)*hFacW(i+1,j,k,bi,bj)*uf(i+1,j)
     &       -dRF(K)*dYG( i ,j,bi,bj)*hFacW( i ,j,k,bi,bj)*uf( i ,j)
     &       +dRF(K)*dXG(i,j+1,bi,bj)*hFacS(i,j+1,k,bi,bj)*vf(i,j+1)
     &       -dRF(K)*dXG(i, j ,bi,bj)*hFacS(i, j ,k,bi,bj)*vf(i, j )
     &       +( freeSurfFac*etaN(i,j,bi,bj)/deltaTMom
     &          -wVel(i,j,k+1,bi,bj)
     &        )*_rA(i,j,bi,bj)/deltaTmom
          ENDDO
         ENDDO
         DO K=2,Nr-1
          DO j=1,sNy
           DO i=1,sNx
            cg3d_b(i,j,k,bi,bj) = cg3d_b(i,j,k,bi,bj)
     &       +dRF(K)*dYG(i+1,j,bi,bj)*hFacW(i+1,j,k,bi,bj)*uf(i+1,j)
     &       -dRF(K)*dYG( i ,j,bi,bj)*hFacW( i ,j,k,bi,bj)*uf( i ,j)
     &       +dRF(K)*dXG(i,j+1,bi,bj)*hFacS(i,j+1,k,bi,bj)*vf(i,j+1)
     &       -dRF(K)*dXG(i, j ,bi,bj)*hFacS(i, j ,k,bi,bj)*vf(i, j )
     &       +( wVel(i,j,k  ,bi,bj)
     &         -wVel(i,j,k+1,bi,bj)
     &        )*_rA(i,j,bi,bj)/deltaTmom

           ENDDO
          ENDDO
         ENDDO
         K=Nr
         DO j=1,sNy
          DO i=1,sNx
            cg3d_b(i,j,k,bi,bj) = cg3d_b(i,j,k,bi,bj)
     &       +dRF(K)*dYG(i+1,j,bi,bj)*hFacW(i+1,j,k,bi,bj)*uf(i+1,j)
     &       -dRF(K)*dYG( i ,j,bi,bj)*hFacW( i ,j,k,bi,bj)*uf( i ,j)
     &       +dRF(K)*dXG(i,j+1,bi,bj)*hFacS(i,j+1,k,bi,bj)*vf(i,j+1)
     &       -dRF(K)*dXG(i, j ,bi,bj)*hFacS(i, j ,k,bi,bj)*vf(i, j )
     &       +( wVel(i,j,k  ,bi,bj)
     &        )*_rA(i,j,bi,bj)/deltaTmom

          ENDDO
         ENDDO

#ifdef ALLOW_OBCS
         IF (useOBCS) THEN
          DO K=1,Nr
          DO i=1,sNx
C Northern boundary
          IF (OB_Jn(I,bi,bj).NE.0) THEN
           cg3d_b(I,OB_Jn(I,bi,bj),K,bi,bj)=0.
          ENDIF
C Southern boundary
          IF (OB_Js(I,bi,bj).NE.0) THEN
           cg3d_b(I,OB_Js(I,bi,bj),K,bi,bj)=0.
          ENDIF
          ENDDO
          DO j=1,sNy
C Eastern boundary
          IF (OB_Ie(J,bi,bj).NE.0) THEN
           cg3d_b(OB_Ie(J,bi,bj),J,K,bi,bj)=0.
          ENDIF
C Western boundary
          IF (OB_Iw(J,bi,bj).NE.0) THEN
           cg3d_b(OB_Iw(J,bi,bj),J,K,bi,bj)=0.
          ENDIF
          ENDDO
          ENDDO
         ENDIF
#endif

        ENDDO ! bi
       ENDDO ! bj

       CALL CG3D( myThid )
       _EXCH_XYZ_R8(cg3d_x, myThid )

      ENDIF
#endif

      RETURN
      END
1	adcroft	1.24	C $Header: /u/gcmpack/models/MITgcmUV/model/src/solve_for_pressure.F,v 1.23 2001/06/06 14:55:45 adcroft Exp $
2	heimbach	1.21	C $Name: $
3	cnh	1.1
4	adcroft	1.5	#include "CPP_OPTIONS.h"
5	cnh	1.1
6			CStartOfInterface
7			SUBROUTINE SOLVE_FOR_PRESSURE( myThid )
8			C /==========================================================\
9			C \| SUBROUTINE SOLVE_FOR_PRESSURE \|
10			C \| o Controls inversion of two and/or three-dimensional \|
11			C \| elliptic problems for the pressure field. \|
12			C \==========================================================/
13	adcroft	1.8	IMPLICIT NONE
14	cnh	1.1
15	cnh	1.4	C == Global variables
16			#include "SIZE.h"
17			#include "EEPARAMS.h"
18			#include "PARAMS.h"
19			#include "DYNVARS.h"
20	adcroft	1.12	#include "GRID.h"
21	jmc	1.17	#include "SURFACE.h"
22	adcroft	1.9	#ifdef ALLOW_NONHYDROSTATIC
23			#include "CG3D.h"
24			#include "GW.h"
25	adcroft	1.12	#endif
26	adcroft	1.11	#ifdef ALLOW_OBCS
27	adcroft	1.9	#include "OBCS.h"
28	adcroft	1.11	#endif
29	adcroft	1.22	#include "SOLVE_FOR_PRESSURE.h"
30	cnh	1.4
31	cnh	1.1	C == Routine arguments ==
32			C myThid - Number of this instance of SOLVE_FOR_PRESSURE
33			INTEGER myThid
34			CEndOfInterface
35	cnh	1.4
36	adcroft	1.22	C == Local variables ==
37	cnh	1.6	INTEGER i,j,k,bi,bj
38	adcroft	1.9	_RS uf(1-Olx:sNx+Olx,1-Oly:sNy+Oly)
39			_RS vf(1-Olx:sNx+Olx,1-Oly:sNy+Oly)
40	adcroft	1.22	_RL firstResidual,lastResidual
41	adcroft	1.19	INTEGER numIters
42	jmc	1.17
43			C-- Save previous solution & Initialise Vector solution and source term :
44			DO bj=myByLo(myThid),myByHi(myThid)
45			DO bi=myBxLo(myThid),myBxHi(myThid)
46			DO j=1-OLy,sNy+OLy
47			DO i=1-OLx,sNx+OLx
48			etaNm1(i,j,bi,bj) = etaN(i,j,bi,bj)
49	jmc	1.18	cg2d_x(i,j,bi,bj) = Bo_surf(i,j,bi,bj)*etaN(i,j,bi,bj)
50	jmc	1.17	cg2d_b(i,j,bi,bj) = 0.
51			#ifdef USE_NATURAL_BCS
52	jmc	1.18	& + freeSurfFac_rA(i,j,bi,bj)
53	jmc	1.17	& EmPmR(I,J,bi,bj)/deltaTMom
54			#endif
55			ENDDO
56			ENDDO
57			ENDDO
58			ENDDO
59	adcroft	1.12
60			DO bj=myByLo(myThid),myByHi(myThid)
61			DO bi=myBxLo(myThid),myBxHi(myThid)
62			DO K=Nr,1,-1
63			DO j=1,sNy+1
64			DO i=1,sNx+1
65			uf(i,j) = _dyG(i,j,bi,bj)
66			& drF(k)_hFacW(i,j,k,bi,bj)
67			vf(i,j) = _dxG(i,j,bi,bj)
68			& drF(k)_hFacS(i,j,k,bi,bj)
69			ENDDO
70			ENDDO
71			CALL CALC_DIV_GHAT(
72			I bi,bj,1,sNx,1,sNy,K,
73			I uf,vf,
74	jmc	1.17	U cg2d_b,
75	adcroft	1.12	I myThid)
76			ENDDO
77			ENDDO
78			ENDDO
79	cnh	1.4
80	adcroft	1.12	C-- Add source term arising from w=d/dt (p_s + p_nh)
81			DO bj=myByLo(myThid),myByHi(myThid)
82			DO bi=myBxLo(myThid),myBxHi(myThid)
83	adcroft	1.13	#ifdef ALLOW_NONHYDROSTATIC
84	adcroft	1.12	DO j=1,sNy
85			DO i=1,sNx
86			cg2d_b(i,j,bi,bj) = cg2d_b(i,j,bi,bj)
87	jmc	1.18	& -freeSurfFac*_rA(i,j,bi,bj)/deltaTMom/deltaTMom
88			& *( etaN(i,j,bi,bj)
89			& +cg3d_x(i,j,1,bi,bj)*horiVertRatio/gravity )
90	adcroft	1.13	cg3d_b(i,j,1,bi,bj) = cg3d_b(i,j,1,bi,bj)
91	jmc	1.18	& -freeSurfFac*_rA(i,j,bi,bj)/deltaTMom/deltaTMom
92			& *( etaN(i,j,bi,bj)
93			& +cg3d_x(i,j,1,bi,bj)*horiVertRatio/gravity )
94			C-jmc
95			c & -freeSurfFac_rA(i,j,bi,bj)recip_Bo(i,j,bi,bj)
96			c & *( cg2d_x(i,j,bi,bj) + cg3d_x(i,j,1,bi,bj) )
97			c & /deltaTMom/deltaTMom
98			C-jmc
99	adcroft	1.12	ENDDO
100			ENDDO
101	adcroft	1.13	#else
102	adcroft	1.12	DO j=1,sNy
103			DO i=1,sNx
104	adcroft	1.13	cg2d_b(i,j,bi,bj) = cg2d_b(i,j,bi,bj)
105	jmc	1.18	& -freeSurfFac*_rA(i,j,bi,bj)/deltaTMom/deltaTMom
106			& * etaN(i,j,bi,bj)
107	adcroft	1.12	ENDDO
108			ENDDO
109			#endif
110
111			#ifdef ALLOW_OBCS
112	adcroft	1.14	IF (useOBCS) THEN
113	adcroft	1.12	DO i=1,sNx
114			C Northern boundary
115			IF (OB_Jn(I,bi,bj).NE.0) THEN
116			cg2d_b(I,OB_Jn(I,bi,bj),bi,bj)=0.
117			ENDIF
118			C Southern boundary
119			IF (OB_Js(I,bi,bj).NE.0) THEN
120			cg2d_b(I,OB_Js(I,bi,bj),bi,bj)=0.
121			ENDIF
122			ENDDO
123			DO j=1,sNy
124			C Eastern boundary
125			IF (OB_Ie(J,bi,bj).NE.0) THEN
126			cg2d_b(OB_Ie(J,bi,bj),J,bi,bj)=0.
127			ENDIF
128			C Western boundary
129			IF (OB_Iw(J,bi,bj).NE.0) THEN
130			cg2d_b(OB_Iw(J,bi,bj),J,bi,bj)=0.
131			ENDIF
132			ENDDO
133			ENDIF
134			#endif
135			ENDDO
136			ENDDO
137
138	adcroft	1.23	#ifndef EXCLUDE_DEBUGMODE
139	adcroft	1.24	IF (debugMode) THEN
140	adcroft	1.23	CALL DEBUG_STATS_RL(1,cg2d_b,'cg2d_b (SOLVE_FOR_PRESSURE)',
141			& myThid)
142	adcroft	1.24	ENDIF
143	adcroft	1.23	#endif
144	adcroft	1.12
145	cnh	1.1	C-- Find the surface pressure using a two-dimensional conjugate
146			C-- gradient solver.
147	adcroft	1.22	C see CG2D.h for the interface to this routine.
148			firstResidual=0.
149			lastResidual=0.
150	adcroft	1.19	numIters=cg2dMaxIters
151	cnh	1.1	CALL CG2D(
152	adcroft	1.22	U cg2d_b,
153	cnh	1.6	U cg2d_x,
154	adcroft	1.22	O firstResidual,
155			O lastResidual,
156	adcroft	1.19	U numIters,
157	cnh	1.1	I myThid )
158	adcroft	1.19	_EXCH_XY_R8(cg2d_x, myThid )
159	adcroft	1.23
160			#ifndef EXCLUDE_DEBUGMODE
161	adcroft	1.24	IF (debugMode) THEN
162	adcroft	1.23	CALL DEBUG_STATS_RL(1,cg2d_x,'cg2d_x (SOLVE_FOR_PRESSURE)',
163			& myThid)
164	adcroft	1.24	ENDIF
165	adcroft	1.23	#endif
166	cnh	1.1
167	adcroft	1.19	_BEGIN_MASTER( myThid )
168	heimbach	1.21	WRITE(*,'(A,I6,1PE30.14)') ' CG2D iters, err = ',
169	adcroft	1.22	& 0, firstResidual
170	heimbach	1.21	WRITE(*,'(A,I6,1PE30.14)') ' CG2D iters, err = ',
171	adcroft	1.22	& numIters, lastResidual
172	adcroft	1.19	_END_MASTER( )
173	jmc	1.17
174			C-- Transfert the 2D-solution to "etaN" :
175			DO bj=myByLo(myThid),myByHi(myThid)
176			DO bi=myBxLo(myThid),myBxHi(myThid)
177			DO j=1-OLy,sNy+OLy
178			DO i=1-OLx,sNx+OLx
179	jmc	1.18	etaN(i,j,bi,bj) = recip_Bo(i,j,bi,bj)*cg2d_x(i,j,bi,bj)
180	jmc	1.17	ENDDO
181			ENDDO
182			ENDDO
183			ENDDO
184	adcroft	1.10
185	adcroft	1.9	#ifdef ALLOW_NONHYDROSTATIC
186			IF ( nonHydrostatic ) THEN
187
188			C-- Solve for a three-dimensional pressure term (NH or IGW or both ).
189			C see CG3D.h for the interface to this routine.
190			DO bj=myByLo(myThid),myByHi(myThid)
191			DO bi=myBxLo(myThid),myBxHi(myThid)
192			DO j=1,sNy+1
193			DO i=1,sNx+1
194	jmc	1.18	uf(i,j)=-_recip_dxC(i,j,bi,bj)*
195	adcroft	1.9	& (cg2d_x(i,j,bi,bj)-cg2d_x(i-1,j,bi,bj))
196	jmc	1.18	vf(i,j)=-_recip_dyC(i,j,bi,bj)*
197	adcroft	1.9	& (cg2d_x(i,j,bi,bj)-cg2d_x(i,j-1,bi,bj))
198			ENDDO
199			ENDDO
200
201	adcroft	1.12	#ifdef ALLOW_OBCS
202	adcroft	1.14	IF (useOBCS) THEN
203	adcroft	1.9	DO i=1,sNx+1
204			C Northern boundary
205			IF (OB_Jn(I,bi,bj).NE.0) THEN
206			vf(I,OB_Jn(I,bi,bj))=0.
207			ENDIF
208			C Southern boundary
209			IF (OB_Js(I,bi,bj).NE.0) THEN
210			vf(I,OB_Js(I,bi,bj)+1)=0.
211			ENDIF
212			ENDDO
213			DO j=1,sNy+1
214			C Eastern boundary
215			IF (OB_Ie(J,bi,bj).NE.0) THEN
216			uf(OB_Ie(J,bi,bj),J)=0.
217			ENDIF
218			C Western boundary
219			IF (OB_Iw(J,bi,bj).NE.0) THEN
220			uf(OB_Iw(J,bi,bj)+1,J)=0.
221			ENDIF
222			ENDDO
223			ENDIF
224	adcroft	1.12	#endif
225	adcroft	1.9
226	adcroft	1.12	K=1
227			DO j=1,sNy
228			DO i=1,sNx
229			cg3d_b(i,j,k,bi,bj) = cg3d_b(i,j,k,bi,bj)
230			& +dRF(K)dYG(i+1,j,bi,bj)hFacW(i+1,j,k,bi,bj)*uf(i+1,j)
231			& -dRF(K)dYG( i ,j,bi,bj)hFacW( i ,j,k,bi,bj)*uf( i ,j)
232			& +dRF(K)dXG(i,j+1,bi,bj)hFacS(i,j+1,k,bi,bj)*vf(i,j+1)
233			& -dRF(K)dXG(i, j ,bi,bj)hFacS(i, j ,k,bi,bj)*vf(i, j )
234	jmc	1.18	& +( freeSurfFac*etaN(i,j,bi,bj)/deltaTMom
235			& -wVel(i,j,k+1,bi,bj)
236	adcroft	1.12	& )*_rA(i,j,bi,bj)/deltaTmom
237			ENDDO
238			ENDDO
239			DO K=2,Nr-1
240	adcroft	1.9	DO j=1,sNy
241			DO i=1,sNx
242			cg3d_b(i,j,k,bi,bj) = cg3d_b(i,j,k,bi,bj)
243			& +dRF(K)dYG(i+1,j,bi,bj)hFacW(i+1,j,k,bi,bj)*uf(i+1,j)
244			& -dRF(K)dYG( i ,j,bi,bj)hFacW( i ,j,k,bi,bj)*uf( i ,j)
245			& +dRF(K)dXG(i,j+1,bi,bj)hFacS(i,j+1,k,bi,bj)*vf(i,j+1)
246			& -dRF(K)dXG(i, j ,bi,bj)hFacS(i, j ,k,bi,bj)*vf(i, j )
247	adcroft	1.12	& +( wVel(i,j,k ,bi,bj)
248			& -wVel(i,j,k+1,bi,bj)
249			& )*_rA(i,j,bi,bj)/deltaTmom
250
251	adcroft	1.9	ENDDO
252			ENDDO
253			ENDDO
254	adcroft	1.12	K=Nr
255			DO j=1,sNy
256			DO i=1,sNx
257			cg3d_b(i,j,k,bi,bj) = cg3d_b(i,j,k,bi,bj)
258			& +dRF(K)dYG(i+1,j,bi,bj)hFacW(i+1,j,k,bi,bj)*uf(i+1,j)
259			& -dRF(K)dYG( i ,j,bi,bj)hFacW( i ,j,k,bi,bj)*uf( i ,j)
260			& +dRF(K)dXG(i,j+1,bi,bj)hFacS(i,j+1,k,bi,bj)*vf(i,j+1)
261			& -dRF(K)dXG(i, j ,bi,bj)hFacS(i, j ,k,bi,bj)*vf(i, j )
262			& +( wVel(i,j,k ,bi,bj)
263			& )*_rA(i,j,bi,bj)/deltaTmom
264
265			ENDDO
266			ENDDO
267
268			#ifdef ALLOW_OBCS
269	adcroft	1.14	IF (useOBCS) THEN
270	adcroft	1.12	DO K=1,Nr
271			DO i=1,sNx
272			C Northern boundary
273			IF (OB_Jn(I,bi,bj).NE.0) THEN
274			cg3d_b(I,OB_Jn(I,bi,bj),K,bi,bj)=0.
275			ENDIF
276			C Southern boundary
277			IF (OB_Js(I,bi,bj).NE.0) THEN
278			cg3d_b(I,OB_Js(I,bi,bj),K,bi,bj)=0.
279			ENDIF
280			ENDDO
281			DO j=1,sNy
282			C Eastern boundary
283			IF (OB_Ie(J,bi,bj).NE.0) THEN
284			cg3d_b(OB_Ie(J,bi,bj),J,K,bi,bj)=0.
285			ENDIF
286			C Western boundary
287			IF (OB_Iw(J,bi,bj).NE.0) THEN
288			cg3d_b(OB_Iw(J,bi,bj),J,K,bi,bj)=0.
289			ENDIF
290			ENDDO
291			ENDDO
292			ENDIF
293			#endif
294	adcroft	1.9
295			ENDDO ! bi
296			ENDDO ! bj
297
298			CALL CG3D( myThid )
299	adcroft	1.10	_EXCH_XYZ_R8(cg3d_x, myThid )
300	adcroft	1.9
301			ENDIF
302			#endif
303	cnh	1.1
304			RETURN
305			END