model/src/solve_for_pressure.F

C $Header: /u/gcmpack/models/MITgcmUV/model/src/solve_for_pressure.F,v 1.16 2001/02/20 15:08:34 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) = etaN(i,j,bi,bj)
          cg2d_b(i,j,bi,bj) = 0.
#ifdef USE_NATURAL_BCS
     &     + freeSurfFac*_rA(i,j,bi,bj)*horiVertRatio*
     &       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)*horiVertRatio*(
     &          -cg2d_x(I,J,bi,bj)
     &          -cg3d_x(I,J,1,bi,bj)
     &        )/deltaTMom/deltaTMom
          cg3d_b(i,j,1,bi,bj) = cg3d_b(i,j,1,bi,bj)
     &      +freeSurfFac*_rA(I,J,bi,bj)*horiVertRatio*(
     &         -cg2d_x(I,J,bi,bj)
     &         -cg3d_x(I,J,1,bi,bj)
     &       )/deltaTMom/deltaTMom
         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)*horiVertRatio*(
     &          -cg2d_x(I,J,bi,bj)
     &        )/deltaTMom/deltaTMom
         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) = 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)=-gBaro*_recip_dxC(i,j,bi,bj)*
     &         (cg2d_x(i,j,bi,bj)-cg2d_x(i-1,j,bi,bj))
           vf(i,j)=-gBaro*_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 )
     &       +(
     &         -wVel(i,j,k+1,bi,bj)
     &        )*_rA(i,j,bi,bj)/deltaTmom
     &       +freeSurfFac*_rA(I,J,bi,bj)*horiVertRatio*(
     &          +cg2d_x(I,J,bi,bj)
     &        )/deltaTMom/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	1.17	C $Header: /u/gcmpack/models/MITgcmUV/model/src/solve_for_pressure.F,v 1.16 2001/02/20 15:08:34 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			cg2d_x(i,j,bi,bj) = etaN(i,j,bi,bj)
53			cg2d_b(i,j,bi,bj) = 0.
54			#ifdef USE_NATURAL_BCS
55			& + freeSurfFac_rA(i,j,bi,bj)horiVertRatio*
56			& 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			& +freeSurfFac_rA(I,J,bi,bj)horiVertRatio*(
91			& -cg2d_x(I,J,bi,bj)
92	adcroft	1.13	& -cg3d_x(I,J,1,bi,bj)
93	adcroft	1.12	& )/deltaTMom/deltaTMom
94	adcroft	1.13	cg3d_b(i,j,1,bi,bj) = cg3d_b(i,j,1,bi,bj)
95			& +freeSurfFac_rA(I,J,bi,bj)horiVertRatio*(
96			& -cg2d_x(I,J,bi,bj)
97			& -cg3d_x(I,J,1,bi,bj)
98			& )/deltaTMom/deltaTMom
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			& +freeSurfFac_rA(I,J,bi,bj)horiVertRatio*(
106			& -cg2d_x(I,J,bi,bj)
107			& )/deltaTMom/deltaTMom
108	adcroft	1.12	ENDDO
109			ENDDO
110			#endif
111
112			#ifdef ALLOW_OBCS
113	adcroft	1.14	IF (useOBCS) THEN
114	adcroft	1.12	DO i=1,sNx
115			C Northern boundary
116			IF (OB_Jn(I,bi,bj).NE.0) THEN
117			cg2d_b(I,OB_Jn(I,bi,bj),bi,bj)=0.
118			ENDIF
119			C Southern boundary
120			IF (OB_Js(I,bi,bj).NE.0) THEN
121			cg2d_b(I,OB_Js(I,bi,bj),bi,bj)=0.
122			ENDIF
123			ENDDO
124			DO j=1,sNy
125			C Eastern boundary
126			IF (OB_Ie(J,bi,bj).NE.0) THEN
127			cg2d_b(OB_Ie(J,bi,bj),J,bi,bj)=0.
128			ENDIF
129			C Western boundary
130			IF (OB_Iw(J,bi,bj).NE.0) THEN
131			cg2d_b(OB_Iw(J,bi,bj),J,bi,bj)=0.
132			ENDIF
133			ENDDO
134			ENDIF
135			#endif
136			ENDDO
137			ENDDO
138
139
140	cnh	1.1	C-- Find the surface pressure using a two-dimensional conjugate
141			C-- gradient solver.
142	jmc	1.17	C see CG2D_INTERNAL.h for the interface to this routine.
143	cnh	1.1	CALL CG2D(
144	cnh	1.6	I cg2d_b,
145			U cg2d_x,
146	cnh	1.1	I myThid )
147
148	adcroft	1.10	_EXCH_XY_R8(cg2d_x, myThid )
149	jmc	1.17
150			C-- Transfert the 2D-solution to "etaN" :
151			DO bj=myByLo(myThid),myByHi(myThid)
152			DO bi=myBxLo(myThid),myBxHi(myThid)
153			DO j=1-OLy,sNy+OLy
154			DO i=1-OLx,sNx+OLx
155			etaN(i,j,bi,bj) = cg2d_x(i,j,bi,bj)
156			ENDDO
157			ENDDO
158			ENDDO
159			ENDDO
160	adcroft	1.10
161	adcroft	1.9	#ifdef ALLOW_NONHYDROSTATIC
162			IF ( nonHydrostatic ) THEN
163
164			C-- Solve for a three-dimensional pressure term (NH or IGW or both ).
165			C see CG3D.h for the interface to this routine.
166			DO bj=myByLo(myThid),myByHi(myThid)
167			DO bi=myBxLo(myThid),myBxHi(myThid)
168			DO j=1,sNy+1
169			DO i=1,sNx+1
170			uf(i,j)=-gBaro_recip_dxC(i,j,bi,bj)
171			& (cg2d_x(i,j,bi,bj)-cg2d_x(i-1,j,bi,bj))
172			vf(i,j)=-gBaro_recip_dyC(i,j,bi,bj)
173			& (cg2d_x(i,j,bi,bj)-cg2d_x(i,j-1,bi,bj))
174			ENDDO
175			ENDDO
176
177	adcroft	1.12	#ifdef ALLOW_OBCS
178	adcroft	1.14	IF (useOBCS) THEN
179	adcroft	1.9	DO i=1,sNx+1
180			C Northern boundary
181			IF (OB_Jn(I,bi,bj).NE.0) THEN
182			vf(I,OB_Jn(I,bi,bj))=0.
183			ENDIF
184			C Southern boundary
185			IF (OB_Js(I,bi,bj).NE.0) THEN
186			vf(I,OB_Js(I,bi,bj)+1)=0.
187			ENDIF
188			ENDDO
189			DO j=1,sNy+1
190			C Eastern boundary
191			IF (OB_Ie(J,bi,bj).NE.0) THEN
192			uf(OB_Ie(J,bi,bj),J)=0.
193			ENDIF
194			C Western boundary
195			IF (OB_Iw(J,bi,bj).NE.0) THEN
196			uf(OB_Iw(J,bi,bj)+1,J)=0.
197			ENDIF
198			ENDDO
199			ENDIF
200	adcroft	1.12	#endif
201	adcroft	1.9
202	adcroft	1.12	K=1
203			DO j=1,sNy
204			DO i=1,sNx
205			cg3d_b(i,j,k,bi,bj) = cg3d_b(i,j,k,bi,bj)
206			& +dRF(K)dYG(i+1,j,bi,bj)hFacW(i+1,j,k,bi,bj)*uf(i+1,j)
207			& -dRF(K)dYG( i ,j,bi,bj)hFacW( i ,j,k,bi,bj)*uf( i ,j)
208			& +dRF(K)dXG(i,j+1,bi,bj)hFacS(i,j+1,k,bi,bj)*vf(i,j+1)
209			& -dRF(K)dXG(i, j ,bi,bj)hFacS(i, j ,k,bi,bj)*vf(i, j )
210			& +(
211			& -wVel(i,j,k+1,bi,bj)
212			& )*_rA(i,j,bi,bj)/deltaTmom
213			& +freeSurfFac_rA(I,J,bi,bj)horiVertRatio*(
214			& +cg2d_x(I,J,bi,bj)
215			& )/deltaTMom/deltaTMom
216			ENDDO
217			ENDDO
218			DO K=2,Nr-1
219	adcroft	1.9	DO j=1,sNy
220			DO i=1,sNx
221			cg3d_b(i,j,k,bi,bj) = cg3d_b(i,j,k,bi,bj)
222			& +dRF(K)dYG(i+1,j,bi,bj)hFacW(i+1,j,k,bi,bj)*uf(i+1,j)
223			& -dRF(K)dYG( i ,j,bi,bj)hFacW( i ,j,k,bi,bj)*uf( i ,j)
224			& +dRF(K)dXG(i,j+1,bi,bj)hFacS(i,j+1,k,bi,bj)*vf(i,j+1)
225			& -dRF(K)dXG(i, j ,bi,bj)hFacS(i, j ,k,bi,bj)*vf(i, j )
226	adcroft	1.12	& +( wVel(i,j,k ,bi,bj)
227			& -wVel(i,j,k+1,bi,bj)
228			& )*_rA(i,j,bi,bj)/deltaTmom
229
230	adcroft	1.9	ENDDO
231			ENDDO
232			ENDDO
233	adcroft	1.12	K=Nr
234			DO j=1,sNy
235			DO i=1,sNx
236			cg3d_b(i,j,k,bi,bj) = cg3d_b(i,j,k,bi,bj)
237			& +dRF(K)dYG(i+1,j,bi,bj)hFacW(i+1,j,k,bi,bj)*uf(i+1,j)
238			& -dRF(K)dYG( i ,j,bi,bj)hFacW( i ,j,k,bi,bj)*uf( i ,j)
239			& +dRF(K)dXG(i,j+1,bi,bj)hFacS(i,j+1,k,bi,bj)*vf(i,j+1)
240			& -dRF(K)dXG(i, j ,bi,bj)hFacS(i, j ,k,bi,bj)*vf(i, j )
241			& +( wVel(i,j,k ,bi,bj)
242			& )*_rA(i,j,bi,bj)/deltaTmom
243
244			ENDDO
245			ENDDO
246
247			#ifdef ALLOW_OBCS
248	adcroft	1.14	IF (useOBCS) THEN
249	adcroft	1.12	DO K=1,Nr
250			DO i=1,sNx
251			C Northern boundary
252			IF (OB_Jn(I,bi,bj).NE.0) THEN
253			cg3d_b(I,OB_Jn(I,bi,bj),K,bi,bj)=0.
254			ENDIF
255			C Southern boundary
256			IF (OB_Js(I,bi,bj).NE.0) THEN
257			cg3d_b(I,OB_Js(I,bi,bj),K,bi,bj)=0.
258			ENDIF
259			ENDDO
260			DO j=1,sNy
261			C Eastern boundary
262			IF (OB_Ie(J,bi,bj).NE.0) THEN
263			cg3d_b(OB_Ie(J,bi,bj),J,K,bi,bj)=0.
264			ENDIF
265			C Western boundary
266			IF (OB_Iw(J,bi,bj).NE.0) THEN
267			cg3d_b(OB_Iw(J,bi,bj),J,K,bi,bj)=0.
268			ENDIF
269			ENDDO
270			ENDDO
271			ENDIF
272			#endif
273	adcroft	1.9
274			ENDDO ! bi
275			ENDDO ! bj
276
277			CALL CG3D( myThid )
278	adcroft	1.10	_EXCH_XYZ_R8(cg3d_x, myThid )
279	adcroft	1.9
280			ENDIF
281			#endif
282	cnh	1.1
283			RETURN
284			END