model/src/solve_for_pressure.F

C $Header: /u/gcmpack/models/MITgcmUV/model/src/solve_for_pressure.F,v 1.17 2001/03/06 16:57:10 jmc 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

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

C     Local variables
C     cg2d_x - Conjugate Gradient 2-D solver : Solution vector
C     cg2d_b - Conjugate Gradient 2-D solver : Right-hand side vector
      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 cg2d_x(1-OLx:sNx+OLx,1-OLy:sNy+OLy,nSx,nSy)
      _RL cg2d_b(1-OLx:sNx+OLx,1-OLy:sNy+OLy,nSx,nSy)

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
#ifdef INCLUDE_CD_CODE
          etaNm1(i,j,bi,bj) = etaN(i,j,bi,bj)
#endif
          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


C--   Find the surface pressure using a two-dimensional conjugate
C--   gradient solver.
C     see CG2D_INTERNAL.h for the interface to this routine.
      CALL CG2D(
     I           cg2d_b,
     U           cg2d_x,
     I           myThid )

      _EXCH_XY_R8(cg2d_x, myThid )

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	jmc	1.18	C $Header: /u/gcmpack/models/MITgcmUV/model/src/solve_for_pressure.F,v 1.17 2001/03/06 16:57:10 jmc Exp $
2	jmc	1.16	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	cnh	1.4
30	cnh	1.1	C == Routine arguments ==
31			C myThid - Number of this instance of SOLVE_FOR_PRESSURE
32			INTEGER myThid
33			CEndOfInterface
34	cnh	1.4
35			C Local variables
36	jmc	1.17	C cg2d_x - Conjugate Gradient 2-D solver : Solution vector
37			C cg2d_b - Conjugate Gradient 2-D solver : Right-hand side vector
38	cnh	1.6	INTEGER i,j,k,bi,bj
39	adcroft	1.9	_RS uf(1-Olx:sNx+Olx,1-Oly:sNy+Oly)
40			_RS vf(1-Olx:sNx+Olx,1-Oly:sNy+Oly)
41	jmc	1.17	_RL cg2d_x(1-OLx:sNx+OLx,1-OLy:sNy+OLy,nSx,nSy)
42			_RL cg2d_b(1-OLx:sNx+OLx,1-OLy:sNy+OLy,nSx,nSy)
43
44			C-- Save previous solution & Initialise Vector solution and source term :
45			DO bj=myByLo(myThid),myByHi(myThid)
46			DO bi=myBxLo(myThid),myBxHi(myThid)
47			DO j=1-OLy,sNy+OLy
48			DO i=1-OLx,sNx+OLx
49			#ifdef INCLUDE_CD_CODE
50			etaNm1(i,j,bi,bj) = etaN(i,j,bi,bj)
51			#endif
52	jmc	1.18	cg2d_x(i,j,bi,bj) = Bo_surf(i,j,bi,bj)*etaN(i,j,bi,bj)
53	jmc	1.17	cg2d_b(i,j,bi,bj) = 0.
54			#ifdef USE_NATURAL_BCS
55	jmc	1.18	& + freeSurfFac_rA(i,j,bi,bj)
56	jmc	1.17	& EmPmR(I,J,bi,bj)/deltaTMom
57			#endif
58			ENDDO
59			ENDDO
60			ENDDO
61			ENDDO
62	adcroft	1.12
63			DO bj=myByLo(myThid),myByHi(myThid)
64			DO bi=myBxLo(myThid),myBxHi(myThid)
65			DO K=Nr,1,-1
66			DO j=1,sNy+1
67			DO i=1,sNx+1
68			uf(i,j) = _dyG(i,j,bi,bj)
69			& drF(k)_hFacW(i,j,k,bi,bj)
70			vf(i,j) = _dxG(i,j,bi,bj)
71			& drF(k)_hFacS(i,j,k,bi,bj)
72			ENDDO
73			ENDDO
74			CALL CALC_DIV_GHAT(
75			I bi,bj,1,sNx,1,sNy,K,
76			I uf,vf,
77	jmc	1.17	U cg2d_b,
78	adcroft	1.12	I myThid)
79			ENDDO
80			ENDDO
81			ENDDO
82	cnh	1.4
83	adcroft	1.12	C-- Add source term arising from w=d/dt (p_s + p_nh)
84			DO bj=myByLo(myThid),myByHi(myThid)
85			DO bi=myBxLo(myThid),myBxHi(myThid)
86	adcroft	1.13	#ifdef ALLOW_NONHYDROSTATIC
87	adcroft	1.12	DO j=1,sNy
88			DO i=1,sNx
89			cg2d_b(i,j,bi,bj) = cg2d_b(i,j,bi,bj)
90	jmc	1.18	& -freeSurfFac*_rA(i,j,bi,bj)/deltaTMom/deltaTMom
91			& *( etaN(i,j,bi,bj)
92			& +cg3d_x(i,j,1,bi,bj)*horiVertRatio/gravity )
93	adcroft	1.13	cg3d_b(i,j,1,bi,bj) = cg3d_b(i,j,1,bi,bj)
94	jmc	1.18	& -freeSurfFac*_rA(i,j,bi,bj)/deltaTMom/deltaTMom
95			& *( etaN(i,j,bi,bj)
96			& +cg3d_x(i,j,1,bi,bj)*horiVertRatio/gravity )
97			C-jmc
98			c & -freeSurfFac_rA(i,j,bi,bj)recip_Bo(i,j,bi,bj)
99			c & *( cg2d_x(i,j,bi,bj) + cg3d_x(i,j,1,bi,bj) )
100			c & /deltaTMom/deltaTMom
101			C-jmc
102	adcroft	1.12	ENDDO
103			ENDDO
104	adcroft	1.13	#else
105	adcroft	1.12	DO j=1,sNy
106			DO i=1,sNx
107	adcroft	1.13	cg2d_b(i,j,bi,bj) = cg2d_b(i,j,bi,bj)
108	jmc	1.18	& -freeSurfFac*_rA(i,j,bi,bj)/deltaTMom/deltaTMom
109			& * etaN(i,j,bi,bj)
110	adcroft	1.12	ENDDO
111			ENDDO
112			#endif
113
114			#ifdef ALLOW_OBCS
115	adcroft	1.14	IF (useOBCS) THEN
116	adcroft	1.12	DO i=1,sNx
117			C Northern boundary
118			IF (OB_Jn(I,bi,bj).NE.0) THEN
119			cg2d_b(I,OB_Jn(I,bi,bj),bi,bj)=0.
120			ENDIF
121			C Southern boundary
122			IF (OB_Js(I,bi,bj).NE.0) THEN
123			cg2d_b(I,OB_Js(I,bi,bj),bi,bj)=0.
124			ENDIF
125			ENDDO
126			DO j=1,sNy
127			C Eastern boundary
128			IF (OB_Ie(J,bi,bj).NE.0) THEN
129			cg2d_b(OB_Ie(J,bi,bj),J,bi,bj)=0.
130			ENDIF
131			C Western boundary
132			IF (OB_Iw(J,bi,bj).NE.0) THEN
133			cg2d_b(OB_Iw(J,bi,bj),J,bi,bj)=0.
134			ENDIF
135			ENDDO
136			ENDIF
137			#endif
138			ENDDO
139			ENDDO
140
141
142	cnh	1.1	C-- Find the surface pressure using a two-dimensional conjugate
143			C-- gradient solver.
144	jmc	1.17	C see CG2D_INTERNAL.h for the interface to this routine.
145	cnh	1.1	CALL CG2D(
146	cnh	1.6	I cg2d_b,
147			U cg2d_x,
148	cnh	1.1	I myThid )
149
150	adcroft	1.10	_EXCH_XY_R8(cg2d_x, myThid )
151	jmc	1.17
152			C-- Transfert the 2D-solution to "etaN" :
153			DO bj=myByLo(myThid),myByHi(myThid)
154			DO bi=myBxLo(myThid),myBxHi(myThid)
155			DO j=1-OLy,sNy+OLy
156			DO i=1-OLx,sNx+OLx
157	jmc	1.18	etaN(i,j,bi,bj) = recip_Bo(i,j,bi,bj)*cg2d_x(i,j,bi,bj)
158	jmc	1.17	ENDDO
159			ENDDO
160			ENDDO
161			ENDDO
162	adcroft	1.10
163	adcroft	1.9	#ifdef ALLOW_NONHYDROSTATIC
164			IF ( nonHydrostatic ) THEN
165
166			C-- Solve for a three-dimensional pressure term (NH or IGW or both ).
167			C see CG3D.h for the interface to this routine.
168			DO bj=myByLo(myThid),myByHi(myThid)
169			DO bi=myBxLo(myThid),myBxHi(myThid)
170			DO j=1,sNy+1
171			DO i=1,sNx+1
172	jmc	1.18	uf(i,j)=-_recip_dxC(i,j,bi,bj)*
173	adcroft	1.9	& (cg2d_x(i,j,bi,bj)-cg2d_x(i-1,j,bi,bj))
174	jmc	1.18	vf(i,j)=-_recip_dyC(i,j,bi,bj)*
175	adcroft	1.9	& (cg2d_x(i,j,bi,bj)-cg2d_x(i,j-1,bi,bj))
176			ENDDO
177			ENDDO
178
179	adcroft	1.12	#ifdef ALLOW_OBCS
180	adcroft	1.14	IF (useOBCS) THEN
181	adcroft	1.9	DO i=1,sNx+1
182			C Northern boundary
183			IF (OB_Jn(I,bi,bj).NE.0) THEN
184			vf(I,OB_Jn(I,bi,bj))=0.
185			ENDIF
186			C Southern boundary
187			IF (OB_Js(I,bi,bj).NE.0) THEN
188			vf(I,OB_Js(I,bi,bj)+1)=0.
189			ENDIF
190			ENDDO
191			DO j=1,sNy+1
192			C Eastern boundary
193			IF (OB_Ie(J,bi,bj).NE.0) THEN
194			uf(OB_Ie(J,bi,bj),J)=0.
195			ENDIF
196			C Western boundary
197			IF (OB_Iw(J,bi,bj).NE.0) THEN
198			uf(OB_Iw(J,bi,bj)+1,J)=0.
199			ENDIF
200			ENDDO
201			ENDIF
202	adcroft	1.12	#endif
203	adcroft	1.9
204	adcroft	1.12	K=1
205			DO j=1,sNy
206			DO i=1,sNx
207			cg3d_b(i,j,k,bi,bj) = cg3d_b(i,j,k,bi,bj)
208			& +dRF(K)dYG(i+1,j,bi,bj)hFacW(i+1,j,k,bi,bj)*uf(i+1,j)
209			& -dRF(K)dYG( i ,j,bi,bj)hFacW( i ,j,k,bi,bj)*uf( i ,j)
210			& +dRF(K)dXG(i,j+1,bi,bj)hFacS(i,j+1,k,bi,bj)*vf(i,j+1)
211			& -dRF(K)dXG(i, j ,bi,bj)hFacS(i, j ,k,bi,bj)*vf(i, j )
212	jmc	1.18	& +( freeSurfFac*etaN(i,j,bi,bj)/deltaTMom
213			& -wVel(i,j,k+1,bi,bj)
214	adcroft	1.12	& )*_rA(i,j,bi,bj)/deltaTmom
215			ENDDO
216			ENDDO
217			DO K=2,Nr-1
218	adcroft	1.9	DO j=1,sNy
219			DO i=1,sNx
220			cg3d_b(i,j,k,bi,bj) = cg3d_b(i,j,k,bi,bj)
221			& +dRF(K)dYG(i+1,j,bi,bj)hFacW(i+1,j,k,bi,bj)*uf(i+1,j)
222			& -dRF(K)dYG( i ,j,bi,bj)hFacW( i ,j,k,bi,bj)*uf( i ,j)
223			& +dRF(K)dXG(i,j+1,bi,bj)hFacS(i,j+1,k,bi,bj)*vf(i,j+1)
224			& -dRF(K)dXG(i, j ,bi,bj)hFacS(i, j ,k,bi,bj)*vf(i, j )
225	adcroft	1.12	& +( wVel(i,j,k ,bi,bj)
226			& -wVel(i,j,k+1,bi,bj)
227			& )*_rA(i,j,bi,bj)/deltaTmom
228
229	adcroft	1.9	ENDDO
230			ENDDO
231			ENDDO
232	adcroft	1.12	K=Nr
233			DO j=1,sNy
234			DO i=1,sNx
235			cg3d_b(i,j,k,bi,bj) = cg3d_b(i,j,k,bi,bj)
236			& +dRF(K)dYG(i+1,j,bi,bj)hFacW(i+1,j,k,bi,bj)*uf(i+1,j)
237			& -dRF(K)dYG( i ,j,bi,bj)hFacW( i ,j,k,bi,bj)*uf( i ,j)
238			& +dRF(K)dXG(i,j+1,bi,bj)hFacS(i,j+1,k,bi,bj)*vf(i,j+1)
239			& -dRF(K)dXG(i, j ,bi,bj)hFacS(i, j ,k,bi,bj)*vf(i, j )
240			& +( wVel(i,j,k ,bi,bj)
241			& )*_rA(i,j,bi,bj)/deltaTmom
242
243			ENDDO
244			ENDDO
245
246			#ifdef ALLOW_OBCS
247	adcroft	1.14	IF (useOBCS) THEN
248	adcroft	1.12	DO K=1,Nr
249			DO i=1,sNx
250			C Northern boundary
251			IF (OB_Jn(I,bi,bj).NE.0) THEN
252			cg3d_b(I,OB_Jn(I,bi,bj),K,bi,bj)=0.
253			ENDIF
254			C Southern boundary
255			IF (OB_Js(I,bi,bj).NE.0) THEN
256			cg3d_b(I,OB_Js(I,bi,bj),K,bi,bj)=0.
257			ENDIF
258			ENDDO
259			DO j=1,sNy
260			C Eastern boundary
261			IF (OB_Ie(J,bi,bj).NE.0) THEN
262			cg3d_b(OB_Ie(J,bi,bj),J,K,bi,bj)=0.
263			ENDIF
264			C Western boundary
265			IF (OB_Iw(J,bi,bj).NE.0) THEN
266			cg3d_b(OB_Iw(J,bi,bj),J,K,bi,bj)=0.
267			ENDIF
268			ENDDO
269			ENDDO
270			ENDIF
271			#endif
272	adcroft	1.9
273			ENDDO ! bi
274			ENDDO ! bj
275
276			CALL CG3D( myThid )
277	adcroft	1.10	_EXCH_XYZ_R8(cg3d_x, myThid )
278	adcroft	1.9
279			ENDIF
280			#endif
281	cnh	1.1
282			RETURN
283			END