model/src/solve_for_pressure.F

C $Header: /u/gcmpack/MITgcm/model/src/solve_for_pressure.F,v 1.42 2003/11/04 18:40:58 edhill Exp $
C $Name:  $

#include "PACKAGES_CONFIG.h"
#include "CPP_OPTIONS.h"

CBOP
C     !ROUTINE: SOLVE_FOR_PRESSURE
C     !INTERFACE:
      SUBROUTINE SOLVE_FOR_PRESSURE(myTime, myIter, myThid)

C     !DESCRIPTION: \bv
C     *==========================================================*
C     | SUBROUTINE SOLVE_FOR_PRESSURE                             
C     | o Controls inversion of two and/or three-dimensional      
C     |   elliptic problems for the pressure field.               
C     *==========================================================*
C     \ev

C     !USES:
      IMPLICIT NONE
C     == Global variables
#include "SIZE.h"
#include "EEPARAMS.h"
#include "PARAMS.h"
#include "DYNVARS.h"
#ifdef ALLOW_CD_CODE
#include "CD_CODE_VARS.h"
#endif
#include "GRID.h"
#include "SURFACE.h"
#include "FFIELDS.h"
#ifdef ALLOW_NONHYDROSTATIC
#include "SOLVE_FOR_PRESSURE3D.h"
#include "GW.h"
#endif
#ifdef ALLOW_OBCS
#include "OBCS.h"
#endif
#include "SOLVE_FOR_PRESSURE.h"

C     === Functions ====
      LOGICAL  DIFFERENT_MULTIPLE
      EXTERNAL DIFFERENT_MULTIPLE

C     !INPUT/OUTPUT PARAMETERS:
C     == Routine arguments ==
C     myTime - Current time in simulation
C     myIter - Current iteration number in simulation
C     myThid - Thread number for this instance of SOLVE_FOR_PRESSURE
      _RL myTime
      INTEGER myIter
      INTEGER myThid

C     !LOCAL VARIABLES:
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
      _RL tmpFac
      INTEGER numIters
      CHARACTER*(MAX_LEN_MBUF) msgBuf
CEOP

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 ALLOW_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.
         ENDDO
        ENDDO
        IF (useRealFreshWaterFlux) THEN
         tmpFac = freeSurfFac*convertEmP2rUnit
         IF (exactConserv) 
     &        tmpFac = freeSurfFac*convertEmP2rUnit*implicDiv2DFlow
         DO j=1,sNy
          DO i=1,sNx
           cg2d_b(i,j,bi,bj) = 
     &       tmpFac*_rA(i,j,bi,bj)*EmPmR(i,j,bi,bj)/deltaTMom
          ENDDO
         ENDDO
        ENDIF
       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
        IF ( nonHydrostatic ) THEN
         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/deltaTfreesurf
     &         *( etaN(i,j,bi,bj)
     &           +phi_nh(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/deltaTfreesurf
     &         *( etaN(i,j,bi,bj)
     &           +phi_nh(i,j,1,bi,bj)*horiVertRatio/gravity )
          ENDDO
         ENDDO
        ELSEIF ( exactConserv ) THEN
#else
        IF ( exactConserv ) THEN
#endif /* 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/deltaTfreesurf
     &         * etaH(i,j,bi,bj)
          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/deltaTfreesurf
     &         * 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.
           cg2d_x(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.
           cg2d_x(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.
           cg2d_x(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.
           cg2d_x(OB_Iw(J,bi,bj),J,bi,bj)=0.
          ENDIF
         ENDDO
        ENDIF
#endif
       ENDDO
      ENDDO

#ifdef ALLOW_DEBUG
      IF ( debugLevel .GE. debLevB ) 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 )

#ifdef ALLOW_DEBUG
      IF ( debugLevel .GE. debLevB ) THEN
       CALL DEBUG_STATS_RL(1,cg2d_x,'cg2d_x (SOLVE_FOR_PRESSURE)',
     &                        myThid)
      ENDIF
#endif

C- dump CG2D output at monitorFreq (to reduce size of STD-OUTPUT files) :
      IF ( DIFFERENT_MULTIPLE(monitorFreq,myTime,
     &                                    myTime-deltaTClock) ) THEN
       IF ( debugLevel .GE. debLevA ) THEN
        _BEGIN_MASTER( myThid )
        WRITE(msgBuf,'(A34,1PE24.14)') 'cg2d_init_res =',firstResidual
        CALL PRINT_MESSAGE(msgBuf,standardMessageUnit,SQUEEZE_RIGHT,1)
        WRITE(msgBuf,'(A34,I6)') 'cg2d_iters =',numIters
        CALL PRINT_MESSAGE(msgBuf,standardMessageUnit,SQUEEZE_RIGHT,1)
        WRITE(msgBuf,'(A34,1PE24.14)') 'cg2d_res =',lastResidual
        CALL PRINT_MESSAGE(msgBuf,standardMessageUnit,SQUEEZE_RIGHT,1)
        _END_MASTER( myThid )
       ENDIF
      ENDIF

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

      firstResidual=0.
      lastResidual=0.
      numIters=cg2dMaxIters
      CALL CG3D(
     U           cg3d_b,
     U           phi_nh,
     O           firstResidual,
     O           lastResidual,
     U           numIters,
     I           myThid )
      _EXCH_XYZ_R8(phi_nh, myThid )

      IF ( DIFFERENT_MULTIPLE(monitorFreq,myTime,
     &                                    myTime-deltaTClock) ) THEN
       IF ( debugLevel .GE. debLevA ) THEN
        _BEGIN_MASTER( myThid )
        WRITE(msgBuf,'(A34,1PE24.14)') 'cg3d_init_res =',firstResidual
        CALL PRINT_MESSAGE(msgBuf,standardMessageUnit,SQUEEZE_RIGHT,1)
        WRITE(msgBuf,'(A34,I6)') 'cg3d_iters =',numIters
        CALL PRINT_MESSAGE(msgBuf,standardMessageUnit,SQUEEZE_RIGHT,1)
        WRITE(msgBuf,'(A34,1PE24.14)') 'cg3d_res =',lastResidual
        CALL PRINT_MESSAGE(msgBuf,standardMessageUnit,SQUEEZE_RIGHT,1)
        _END_MASTER( myThid )
       ENDIF
      ENDIF

      ENDIF
#endif

      RETURN
      END
1	edhill	1.43	C $Header: /u/gcmpack/MITgcm/model/src/solve_for_pressure.F,v 1.42 2003/11/04 18:40:58 edhill Exp $
2	heimbach	1.21	C $Name: $
3	cnh	1.1
4	edhill	1.39	#include "PACKAGES_CONFIG.h"
5	adcroft	1.5	#include "CPP_OPTIONS.h"
6	cnh	1.1
7	cnh	1.27	CBOP
8			C !ROUTINE: SOLVE_FOR_PRESSURE
9			C !INTERFACE:
10	jmc	1.29	SUBROUTINE SOLVE_FOR_PRESSURE(myTime, myIter, myThid)
11	cnh	1.27
12			C !DESCRIPTION: \bv
13			C ==========================================================
14			C \| SUBROUTINE SOLVE_FOR_PRESSURE
15			C \| o Controls inversion of two and/or three-dimensional
16			C \| elliptic problems for the pressure field.
17			C ==========================================================
18			C \ev
19
20			C !USES:
21	adcroft	1.8	IMPLICIT NONE
22	cnh	1.4	C == Global variables
23			#include "SIZE.h"
24			#include "EEPARAMS.h"
25			#include "PARAMS.h"
26			#include "DYNVARS.h"
27	edhill	1.41	#ifdef ALLOW_CD_CODE
28			#include "CD_CODE_VARS.h"
29			#endif
30	adcroft	1.12	#include "GRID.h"
31	jmc	1.17	#include "SURFACE.h"
32	jmc	1.28	#include "FFIELDS.h"
33	adcroft	1.9	#ifdef ALLOW_NONHYDROSTATIC
34	adcroft	1.25	#include "SOLVE_FOR_PRESSURE3D.h"
35	adcroft	1.9	#include "GW.h"
36	adcroft	1.12	#endif
37	adcroft	1.11	#ifdef ALLOW_OBCS
38	adcroft	1.9	#include "OBCS.h"
39	adcroft	1.11	#endif
40	adcroft	1.22	#include "SOLVE_FOR_PRESSURE.h"
41	cnh	1.4
42	jmc	1.32	C === Functions ====
43			LOGICAL DIFFERENT_MULTIPLE
44			EXTERNAL DIFFERENT_MULTIPLE
45
46	cnh	1.27	C !INPUT/OUTPUT PARAMETERS:
47	cnh	1.1	C == Routine arguments ==
48	jmc	1.28	C myTime - Current time in simulation
49			C myIter - Current iteration number in simulation
50			C myThid - Thread number for this instance of SOLVE_FOR_PRESSURE
51			_RL myTime
52			INTEGER myIter
53	jmc	1.29	INTEGER myThid
54	cnh	1.4
55	cnh	1.27	C !LOCAL VARIABLES:
56	adcroft	1.22	C == Local variables ==
57	cnh	1.6	INTEGER i,j,k,bi,bj
58	adcroft	1.9	_RS uf(1-Olx:sNx+Olx,1-Oly:sNy+Oly)
59			_RS vf(1-Olx:sNx+Olx,1-Oly:sNy+Oly)
60	adcroft	1.22	_RL firstResidual,lastResidual
61	jmc	1.36	_RL tmpFac
62	adcroft	1.19	INTEGER numIters
63	adcroft	1.25	CHARACTER*(MAX_LEN_MBUF) msgBuf
64	cnh	1.27	CEOP
65	jmc	1.17
66			C-- Save previous solution & Initialise Vector solution and source term :
67			DO bj=myByLo(myThid),myByHi(myThid)
68			DO bi=myBxLo(myThid),myBxHi(myThid)
69			DO j=1-OLy,sNy+OLy
70			DO i=1-OLx,sNx+OLx
71	edhill	1.40	#ifdef ALLOW_CD_CODE
72	jmc	1.17	etaNm1(i,j,bi,bj) = etaN(i,j,bi,bj)
73	jmc	1.26	#endif
74	jmc	1.18	cg2d_x(i,j,bi,bj) = Bo_surf(i,j,bi,bj)*etaN(i,j,bi,bj)
75	jmc	1.17	cg2d_b(i,j,bi,bj) = 0.
76			ENDDO
77			ENDDO
78	jmc	1.29	IF (useRealFreshWaterFlux) THEN
79	jmc	1.36	tmpFac = freeSurfFac*convertEmP2rUnit
80	mlosch	1.35	IF (exactConserv)
81	jmc	1.36	& tmpFac = freeSurfFacconvertEmP2rUnitimplicDiv2DFlow
82	jmc	1.29	DO j=1,sNy
83			DO i=1,sNx
84			cg2d_b(i,j,bi,bj) =
85			& tmpFac_rA(i,j,bi,bj)EmPmR(i,j,bi,bj)/deltaTMom
86			ENDDO
87			ENDDO
88			ENDIF
89	jmc	1.17	ENDDO
90			ENDDO
91	adcroft	1.12
92			DO bj=myByLo(myThid),myByHi(myThid)
93			DO bi=myBxLo(myThid),myBxHi(myThid)
94			DO K=Nr,1,-1
95			DO j=1,sNy+1
96			DO i=1,sNx+1
97			uf(i,j) = _dyG(i,j,bi,bj)
98			& drF(k)_hFacW(i,j,k,bi,bj)
99			vf(i,j) = _dxG(i,j,bi,bj)
100			& drF(k)_hFacS(i,j,k,bi,bj)
101			ENDDO
102			ENDDO
103			CALL CALC_DIV_GHAT(
104			I bi,bj,1,sNx,1,sNy,K,
105			I uf,vf,
106	jmc	1.17	U cg2d_b,
107	adcroft	1.12	I myThid)
108			ENDDO
109			ENDDO
110			ENDDO
111	cnh	1.4
112	adcroft	1.12	C-- Add source term arising from w=d/dt (p_s + p_nh)
113			DO bj=myByLo(myThid),myByHi(myThid)
114			DO bi=myBxLo(myThid),myBxHi(myThid)
115	adcroft	1.13	#ifdef ALLOW_NONHYDROSTATIC
116	jmc	1.28	IF ( nonHydrostatic ) THEN
117			DO j=1,sNy
118			DO i=1,sNx
119			cg2d_b(i,j,bi,bj) = cg2d_b(i,j,bi,bj)
120	adcroft	1.33	& -freeSurfFac*_rA(i,j,bi,bj)/deltaTMom/deltaTfreesurf
121	jmc	1.28	& *( etaN(i,j,bi,bj)
122			& +phi_nh(i,j,1,bi,bj)*horiVertRatio/gravity )
123			cg3d_b(i,j,1,bi,bj) = cg3d_b(i,j,1,bi,bj)
124	adcroft	1.33	& -freeSurfFac*_rA(i,j,bi,bj)/deltaTMom/deltaTfreesurf
125	jmc	1.28	& *( etaN(i,j,bi,bj)
126			& +phi_nh(i,j,1,bi,bj)*horiVertRatio/gravity )
127			ENDDO
128	adcroft	1.12	ENDDO
129	jmc	1.28	ELSEIF ( exactConserv ) THEN
130	adcroft	1.13	#else
131	jmc	1.26	IF ( exactConserv ) THEN
132	edhill	1.39	#endif /* ALLOW_NONHYDROSTATIC */
133	jmc	1.26	DO j=1,sNy
134			DO i=1,sNx
135			cg2d_b(i,j,bi,bj) = cg2d_b(i,j,bi,bj)
136	adcroft	1.33	& -freeSurfFac*_rA(i,j,bi,bj)/deltaTMom/deltaTfreesurf
137	jmc	1.26	& * etaH(i,j,bi,bj)
138			ENDDO
139			ENDDO
140			ELSE
141			DO j=1,sNy
142			DO i=1,sNx
143			cg2d_b(i,j,bi,bj) = cg2d_b(i,j,bi,bj)
144	adcroft	1.33	& -freeSurfFac*_rA(i,j,bi,bj)/deltaTMom/deltaTfreesurf
145	jmc	1.26	& * etaN(i,j,bi,bj)
146			ENDDO
147	adcroft	1.12	ENDDO
148	jmc	1.26	ENDIF
149	adcroft	1.12
150			#ifdef ALLOW_OBCS
151	adcroft	1.14	IF (useOBCS) THEN
152	adcroft	1.12	DO i=1,sNx
153			C Northern boundary
154			IF (OB_Jn(I,bi,bj).NE.0) THEN
155			cg2d_b(I,OB_Jn(I,bi,bj),bi,bj)=0.
156	jmc	1.31	cg2d_x(I,OB_Jn(I,bi,bj),bi,bj)=0.
157	adcroft	1.12	ENDIF
158			C Southern boundary
159			IF (OB_Js(I,bi,bj).NE.0) THEN
160			cg2d_b(I,OB_Js(I,bi,bj),bi,bj)=0.
161	jmc	1.31	cg2d_x(I,OB_Js(I,bi,bj),bi,bj)=0.
162	adcroft	1.12	ENDIF
163			ENDDO
164			DO j=1,sNy
165			C Eastern boundary
166			IF (OB_Ie(J,bi,bj).NE.0) THEN
167			cg2d_b(OB_Ie(J,bi,bj),J,bi,bj)=0.
168	jmc	1.31	cg2d_x(OB_Ie(J,bi,bj),J,bi,bj)=0.
169	adcroft	1.12	ENDIF
170			C Western boundary
171			IF (OB_Iw(J,bi,bj).NE.0) THEN
172			cg2d_b(OB_Iw(J,bi,bj),J,bi,bj)=0.
173	jmc	1.31	cg2d_x(OB_Iw(J,bi,bj),J,bi,bj)=0.
174	adcroft	1.12	ENDIF
175			ENDDO
176			ENDIF
177			#endif
178			ENDDO
179			ENDDO
180
181	edhill	1.42	#ifdef ALLOW_DEBUG
182	heimbach	1.38	IF ( debugLevel .GE. debLevB ) THEN
183	adcroft	1.23	CALL DEBUG_STATS_RL(1,cg2d_b,'cg2d_b (SOLVE_FOR_PRESSURE)',
184			& myThid)
185	adcroft	1.24	ENDIF
186	adcroft	1.23	#endif
187	adcroft	1.12
188	cnh	1.1	C-- Find the surface pressure using a two-dimensional conjugate
189			C-- gradient solver.
190	adcroft	1.22	C see CG2D.h for the interface to this routine.
191			firstResidual=0.
192			lastResidual=0.
193	adcroft	1.19	numIters=cg2dMaxIters
194	cnh	1.1	CALL CG2D(
195	adcroft	1.22	U cg2d_b,
196	cnh	1.6	U cg2d_x,
197	adcroft	1.22	O firstResidual,
198			O lastResidual,
199	adcroft	1.19	U numIters,
200	cnh	1.1	I myThid )
201	adcroft	1.19	_EXCH_XY_R8(cg2d_x, myThid )
202	adcroft	1.23
203	edhill	1.42	#ifdef ALLOW_DEBUG
204	heimbach	1.38	IF ( debugLevel .GE. debLevB ) THEN
205	adcroft	1.23	CALL DEBUG_STATS_RL(1,cg2d_x,'cg2d_x (SOLVE_FOR_PRESSURE)',
206			& myThid)
207	adcroft	1.24	ENDIF
208	adcroft	1.23	#endif
209	cnh	1.1
210	jmc	1.32	C- dump CG2D output at monitorFreq (to reduce size of STD-OUTPUT files) :
211			IF ( DIFFERENT_MULTIPLE(monitorFreq,myTime,
212			& myTime-deltaTClock) ) THEN
213	heimbach	1.38	IF ( debugLevel .GE. debLevA ) THEN
214			_BEGIN_MASTER( myThid )
215			WRITE(msgBuf,'(A34,1PE24.14)') 'cg2d_init_res =',firstResidual
216			CALL PRINT_MESSAGE(msgBuf,standardMessageUnit,SQUEEZE_RIGHT,1)
217			WRITE(msgBuf,'(A34,I6)') 'cg2d_iters =',numIters
218			CALL PRINT_MESSAGE(msgBuf,standardMessageUnit,SQUEEZE_RIGHT,1)
219			WRITE(msgBuf,'(A34,1PE24.14)') 'cg2d_res =',lastResidual
220			CALL PRINT_MESSAGE(msgBuf,standardMessageUnit,SQUEEZE_RIGHT,1)
221	edhill	1.43	_END_MASTER( myThid )
222	heimbach	1.38	ENDIF
223	jmc	1.32	ENDIF
224	jmc	1.17
225			C-- Transfert the 2D-solution to "etaN" :
226			DO bj=myByLo(myThid),myByHi(myThid)
227			DO bi=myBxLo(myThid),myBxHi(myThid)
228			DO j=1-OLy,sNy+OLy
229			DO i=1-OLx,sNx+OLx
230	jmc	1.18	etaN(i,j,bi,bj) = recip_Bo(i,j,bi,bj)*cg2d_x(i,j,bi,bj)
231	jmc	1.17	ENDDO
232			ENDDO
233			ENDDO
234			ENDDO
235	adcroft	1.10
236	adcroft	1.9	#ifdef ALLOW_NONHYDROSTATIC
237			IF ( nonHydrostatic ) THEN
238
239			C-- Solve for a three-dimensional pressure term (NH or IGW or both ).
240			C see CG3D.h for the interface to this routine.
241			DO bj=myByLo(myThid),myByHi(myThid)
242			DO bi=myBxLo(myThid),myBxHi(myThid)
243			DO j=1,sNy+1
244			DO i=1,sNx+1
245	jmc	1.18	uf(i,j)=-_recip_dxC(i,j,bi,bj)*
246	adcroft	1.9	& (cg2d_x(i,j,bi,bj)-cg2d_x(i-1,j,bi,bj))
247	jmc	1.18	vf(i,j)=-_recip_dyC(i,j,bi,bj)*
248	adcroft	1.9	& (cg2d_x(i,j,bi,bj)-cg2d_x(i,j-1,bi,bj))
249			ENDDO
250			ENDDO
251
252	adcroft	1.12	#ifdef ALLOW_OBCS
253	adcroft	1.14	IF (useOBCS) THEN
254	adcroft	1.9	DO i=1,sNx+1
255			C Northern boundary
256			IF (OB_Jn(I,bi,bj).NE.0) THEN
257			vf(I,OB_Jn(I,bi,bj))=0.
258			ENDIF
259			C Southern boundary
260			IF (OB_Js(I,bi,bj).NE.0) THEN
261			vf(I,OB_Js(I,bi,bj)+1)=0.
262			ENDIF
263			ENDDO
264			DO j=1,sNy+1
265			C Eastern boundary
266			IF (OB_Ie(J,bi,bj).NE.0) THEN
267			uf(OB_Ie(J,bi,bj),J)=0.
268			ENDIF
269			C Western boundary
270			IF (OB_Iw(J,bi,bj).NE.0) THEN
271			uf(OB_Iw(J,bi,bj)+1,J)=0.
272			ENDIF
273			ENDDO
274			ENDIF
275	adcroft	1.12	#endif
276	adcroft	1.9
277	adcroft	1.12	K=1
278			DO j=1,sNy
279			DO i=1,sNx
280			cg3d_b(i,j,k,bi,bj) = cg3d_b(i,j,k,bi,bj)
281			& +dRF(K)dYG(i+1,j,bi,bj)hFacW(i+1,j,k,bi,bj)*uf(i+1,j)
282			& -dRF(K)dYG( i ,j,bi,bj)hFacW( i ,j,k,bi,bj)*uf( i ,j)
283			& +dRF(K)dXG(i,j+1,bi,bj)hFacS(i,j+1,k,bi,bj)*vf(i,j+1)
284			& -dRF(K)dXG(i, j ,bi,bj)hFacS(i, j ,k,bi,bj)*vf(i, j )
285	jmc	1.18	& +( freeSurfFac*etaN(i,j,bi,bj)/deltaTMom
286			& -wVel(i,j,k+1,bi,bj)
287	adcroft	1.12	& )*_rA(i,j,bi,bj)/deltaTmom
288			ENDDO
289			ENDDO
290			DO K=2,Nr-1
291	adcroft	1.9	DO j=1,sNy
292			DO i=1,sNx
293			cg3d_b(i,j,k,bi,bj) = cg3d_b(i,j,k,bi,bj)
294			& +dRF(K)dYG(i+1,j,bi,bj)hFacW(i+1,j,k,bi,bj)*uf(i+1,j)
295			& -dRF(K)dYG( i ,j,bi,bj)hFacW( i ,j,k,bi,bj)*uf( i ,j)
296			& +dRF(K)dXG(i,j+1,bi,bj)hFacS(i,j+1,k,bi,bj)*vf(i,j+1)
297			& -dRF(K)dXG(i, j ,bi,bj)hFacS(i, j ,k,bi,bj)*vf(i, j )
298	adcroft	1.12	& +( wVel(i,j,k ,bi,bj)
299			& -wVel(i,j,k+1,bi,bj)
300			& )*_rA(i,j,bi,bj)/deltaTmom
301
302	adcroft	1.9	ENDDO
303			ENDDO
304			ENDDO
305	adcroft	1.12	K=Nr
306			DO j=1,sNy
307			DO i=1,sNx
308			cg3d_b(i,j,k,bi,bj) = cg3d_b(i,j,k,bi,bj)
309			& +dRF(K)dYG(i+1,j,bi,bj)hFacW(i+1,j,k,bi,bj)*uf(i+1,j)
310			& -dRF(K)dYG( i ,j,bi,bj)hFacW( i ,j,k,bi,bj)*uf( i ,j)
311			& +dRF(K)dXG(i,j+1,bi,bj)hFacS(i,j+1,k,bi,bj)*vf(i,j+1)
312			& -dRF(K)dXG(i, j ,bi,bj)hFacS(i, j ,k,bi,bj)*vf(i, j )
313			& +( wVel(i,j,k ,bi,bj)
314			& )*_rA(i,j,bi,bj)/deltaTmom
315
316			ENDDO
317			ENDDO
318
319			#ifdef ALLOW_OBCS
320	adcroft	1.14	IF (useOBCS) THEN
321	adcroft	1.12	DO K=1,Nr
322			DO i=1,sNx
323			C Northern boundary
324			IF (OB_Jn(I,bi,bj).NE.0) THEN
325			cg3d_b(I,OB_Jn(I,bi,bj),K,bi,bj)=0.
326			ENDIF
327			C Southern boundary
328			IF (OB_Js(I,bi,bj).NE.0) THEN
329			cg3d_b(I,OB_Js(I,bi,bj),K,bi,bj)=0.
330			ENDIF
331			ENDDO
332			DO j=1,sNy
333			C Eastern boundary
334			IF (OB_Ie(J,bi,bj).NE.0) THEN
335			cg3d_b(OB_Ie(J,bi,bj),J,K,bi,bj)=0.
336			ENDIF
337			C Western boundary
338			IF (OB_Iw(J,bi,bj).NE.0) THEN
339			cg3d_b(OB_Iw(J,bi,bj),J,K,bi,bj)=0.
340			ENDIF
341			ENDDO
342			ENDDO
343			ENDIF
344			#endif
345	adcroft	1.9
346			ENDDO ! bi
347			ENDDO ! bj
348
349	adcroft	1.25	firstResidual=0.
350			lastResidual=0.
351			numIters=cg2dMaxIters
352			CALL CG3D(
353			U cg3d_b,
354			U phi_nh,
355			O firstResidual,
356			O lastResidual,
357			U numIters,
358			I myThid )
359			_EXCH_XYZ_R8(phi_nh, myThid )
360
361	mlosch	1.37	IF ( DIFFERENT_MULTIPLE(monitorFreq,myTime,
362			& myTime-deltaTClock) ) THEN
363	heimbach	1.38	IF ( debugLevel .GE. debLevA ) THEN
364			_BEGIN_MASTER( myThid )
365			WRITE(msgBuf,'(A34,1PE24.14)') 'cg3d_init_res =',firstResidual
366			CALL PRINT_MESSAGE(msgBuf,standardMessageUnit,SQUEEZE_RIGHT,1)
367			WRITE(msgBuf,'(A34,I6)') 'cg3d_iters =',numIters
368			CALL PRINT_MESSAGE(msgBuf,standardMessageUnit,SQUEEZE_RIGHT,1)
369			WRITE(msgBuf,'(A34,1PE24.14)') 'cg3d_res =',lastResidual
370			CALL PRINT_MESSAGE(msgBuf,standardMessageUnit,SQUEEZE_RIGHT,1)
371	edhill	1.43	_END_MASTER( myThid )
372	heimbach	1.38	ENDIF
373	mlosch	1.37	ENDIF
374	adcroft	1.9
375			ENDIF
376			#endif
377	cnh	1.1
378			RETURN
379			END