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adcroft |
1.21 |
C $Header: /u/gcmpack/models/MITgcmUV/model/src/calc_gs.F,v 1.20 2000/06/09 14:26:30 heimbach Exp $ |
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cnh |
1.1 |
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cnh |
1.17 |
#include "CPP_OPTIONS.h" |
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cnh |
1.1 |
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5 |
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CStartOfInterFace |
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SUBROUTINE CALC_GS( |
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I bi,bj,iMin,iMax,jMin,jMax,k,kM1,kUp,kDown, |
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cnh |
1.12 |
I xA,yA,uTrans,vTrans,rTrans,maskup,maskC, |
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adcroft |
1.21 |
I KappaRS, |
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adcroft |
1.7 |
U af,df,fZon,fMer,fVerS, |
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cnh |
1.16 |
I myCurrentTime, myThid ) |
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cnh |
1.1 |
C /==========================================================\ |
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C | SUBROUTINE CALC_GS | |
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adcroft |
1.7 |
C | o Calculate the salt tendency terms. | |
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cnh |
1.1 |
C |==========================================================| |
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C | A procedure called EXTERNAL_FORCING_S is called from | |
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C | here. These procedures can be used to add per problem | |
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adcroft |
1.7 |
C | E-P flux source terms. | |
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cnh |
1.1 |
C | Note: Although it is slightly counter-intuitive the | |
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C | EXTERNAL_FORCING routine is not the place to put | |
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C | file I/O. Instead files that are required to | |
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C | calculate the external source terms are generally | |
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C | read during the model main loop. This makes the | |
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C | logisitics of multi-processing simpler and also | |
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C | makes the adjoint generation simpler. It also | |
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C | allows for I/O to overlap computation where that | |
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C | is supported by hardware. | |
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C | Aside from the problem specific term the code here | |
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C | forms the tendency terms due to advection and mixing | |
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C | The baseline implementation here uses a centered | |
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C | difference form for the advection term and a tensorial | |
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C | divergence of a flux form for the diffusive term. The | |
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C | diffusive term is formulated so that isopycnal mixing and| |
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C | GM-style subgrid-scale terms can be incorporated b simply| |
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C | setting the diffusion tensor terms appropriately. | |
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C \==========================================================/ |
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IMPLICIT NONE |
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C == GLobal variables == |
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#include "SIZE.h" |
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#include "DYNVARS.h" |
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#include "EEPARAMS.h" |
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#include "PARAMS.h" |
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#include "GRID.h" |
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cnh |
1.8 |
#include "FFIELDS.h" |
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cnh |
1.1 |
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C == Routine arguments == |
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C fZon - Work array for flux of temperature in the east-west |
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C direction at the west face of a cell. |
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C fMer - Work array for flux of temperature in the north-south |
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C direction at the south face of a cell. |
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adcroft |
1.7 |
C fVerS - Flux of salt (S) in the vertical |
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cnh |
1.1 |
C direction at the upper(U) and lower(D) faces of a cell. |
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C maskUp - Land mask used to denote base of the domain. |
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adcroft |
1.10 |
C maskC - Land mask for salt cells (used in TOP_LAYER only) |
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cnh |
1.1 |
C xA - Tracer cell face area normal to X |
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C yA - Tracer cell face area normal to X |
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C uTrans - Zonal volume transport through cell face |
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C vTrans - Meridional volume transport through cell face |
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adcroft |
1.18 |
C rTrans - Vertical volume transport through cell face |
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cnh |
1.1 |
C af - Advective flux component work array |
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C df - Diffusive flux component work array |
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C bi, bj, iMin, iMax, jMin, jMax - Range of points for which calculation |
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C results will be set. |
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adcroft |
1.7 |
C myThid - Instance number for this innvocation of CALC_GT |
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cnh |
1.1 |
_RL fZon (1-OLx:sNx+OLx,1-OLy:sNy+OLy) |
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_RL fMer (1-OLx:sNx+OLx,1-OLy:sNy+OLy) |
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_RL fVerS (1-OLx:sNx+OLx,1-OLy:sNy+OLy,2) |
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_RS xA (1-OLx:sNx+OLx,1-OLy:sNy+OLy) |
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_RS yA (1-OLx:sNx+OLx,1-OLy:sNy+OLy) |
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_RL uTrans(1-OLx:sNx+OLx,1-OLy:sNy+OLy) |
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_RL vTrans(1-OLx:sNx+OLx,1-OLy:sNy+OLy) |
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cnh |
1.12 |
_RL rTrans(1-OLx:sNx+OLx,1-OLy:sNy+OLy) |
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cnh |
1.1 |
_RS maskUp(1-OLx:sNx+OLx,1-OLy:sNy+OLy) |
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adcroft |
1.10 |
_RS maskC (1-OLx:sNx+OLx,1-OLy:sNy+OLy) |
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cnh |
1.14 |
_RL KappaRS(1-OLx:sNx+OLx,1-OLy:sNy+OLy,Nr) |
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cnh |
1.1 |
_RL af (1-OLx:sNx+OLx,1-OLy:sNy+OLy) |
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_RL df (1-OLx:sNx+OLx,1-OLy:sNy+OLy) |
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adcroft |
1.7 |
INTEGER k,kUp,kDown,kM1 |
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cnh |
1.1 |
INTEGER bi,bj,iMin,iMax,jMin,jMax |
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adcroft |
1.18 |
_RL myCurrentTime |
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cnh |
1.1 |
INTEGER myThid |
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CEndOfInterface |
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C == Local variables == |
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C I, J, K - Loop counters |
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adcroft |
1.7 |
INTEGER i,j |
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LOGICAL TOP_LAYER |
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_RL afFacS, dfFacS |
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_RL dSdx(1-OLx:sNx+OLx,1-OLy:sNy+OLy) |
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_RL dSdy(1-OLx:sNx+OLx,1-OLy:sNy+OLy) |
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adcroft |
1.19 |
_RL df4 (1-OLx:sNx+OLx,1-OLy:sNy+OLy) |
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heimbach |
1.20 |
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#ifdef ALLOW_AUTODIFF_TAMC |
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C-- only the kUp part of fverS is set in this subroutine |
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C-- the kDown is still required |
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fVerS(1,1,kDown) = fVerS(1,1,kDown) |
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DO j=1-OLy,sNy+OLy |
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DO i=1-OLx,sNx+OLx |
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fZon(i,j) = 0.0 |
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fMer(i,j) = 0.0 |
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fVerS(i,j,kUp) = 0.0 |
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ENDDO |
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ENDDO |
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#endif |
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cnh |
1.1 |
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108 |
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afFacS = 1. _d 0 |
109 |
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dfFacS = 1. _d 0 |
110 |
adcroft |
1.7 |
TOP_LAYER = K .EQ. 1 |
111 |
cnh |
1.1 |
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C--- Calculate advective and diffusive fluxes between cells. |
113 |
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adcroft |
1.19 |
#ifdef INCLUDE_T_DIFFUSION_CODE |
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C o Zonal tracer gradient |
116 |
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DO j=1-Oly,sNy+Oly |
117 |
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DO i=1-Olx+1,sNx+Olx |
118 |
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dSdx(i,j) = _recip_dxC(i,j,bi,bj)* |
119 |
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& (salt(i,j,k,bi,bj)-salt(i-1,j,k,bi,bj)) |
120 |
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ENDDO |
121 |
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ENDDO |
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C o Meridional tracer gradient |
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DO j=1-Oly+1,sNy+Oly |
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DO i=1-Olx,sNx+Olx |
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dSdy(i,j) = _recip_dyC(i,j,bi,bj)* |
126 |
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& (salt(i,j,k,bi,bj)-salt(i,j-1,k,bi,bj)) |
127 |
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ENDDO |
128 |
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ENDDO |
129 |
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130 |
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C-- del^2 of S, needed for bi-harmonic (del^4) term |
131 |
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IF (diffK4S .NE. 0.) THEN |
132 |
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DO j=1-Oly+1,sNy+Oly-1 |
133 |
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DO i=1-Olx+1,sNx+Olx-1 |
134 |
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df4(i,j)= _recip_hFacC(i,j,k,bi,bj) |
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& *recip_drF(k)/_rA(i,j,bi,bj) |
136 |
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& *( |
137 |
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& +( xA(i+1,j)*dSdx(i+1,j)-xA(i,j)*dSdx(i,j) ) |
138 |
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& +( yA(i,j+1)*dSdy(i,j+1)-yA(i,j)*dSdy(i,j) ) |
139 |
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& ) |
140 |
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ENDDO |
141 |
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ENDDO |
142 |
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ENDIF |
143 |
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#endif |
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cnh |
1.1 |
C-- Zonal flux (fZon is at west face of "salt" cell) |
146 |
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C Advective component of zonal flux |
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DO j=jMin,jMax |
148 |
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DO i=iMin,iMax |
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af(i,j) = |
150 |
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& uTrans(i,j)*(salt(i,j,k,bi,bj)+salt(i-1,j,k,bi,bj))*0.5 _d 0 |
151 |
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ENDDO |
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ENDDO |
153 |
adcroft |
1.19 |
C o Diffusive component of zonal flux |
154 |
cnh |
1.1 |
DO j=jMin,jMax |
155 |
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DO i=iMin,iMax |
156 |
adcroft |
1.21 |
df(i,j) = -diffKhS*xA(i,j)*dSdx(i,j) |
157 |
cnh |
1.1 |
ENDDO |
158 |
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ENDDO |
159 |
adcroft |
1.21 |
#ifdef ALLOW_GMREDI |
160 |
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IF (use_GMRedi) CALL GMREDI_XTRANSPORT( |
161 |
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I iMin,iMax,jMin,jMax,bi,bj,K, |
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I xA,salt, |
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U df, |
164 |
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I myThid) |
165 |
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#endif |
166 |
adcroft |
1.19 |
C o Add the bi-harmonic contribution |
167 |
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IF (diffK4S .NE. 0.) THEN |
168 |
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DO j=jMin,jMax |
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DO i=iMin,iMax |
170 |
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df(i,j) = df(i,j) + xA(i,j)* |
171 |
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& diffK4S*(df4(i,j)-df4(i-1,j))*_recip_dxC(i,j,bi,bj) |
172 |
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ENDDO |
173 |
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ENDDO |
174 |
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ENDIF |
175 |
cnh |
1.1 |
C Net zonal flux |
176 |
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DO j=jMin,jMax |
177 |
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DO i=iMin,iMax |
178 |
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fZon(i,j) = afFacS*af(i,j) + dfFacS*df(i,j) |
179 |
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ENDDO |
180 |
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ENDDO |
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182 |
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C-- Meridional flux (fMer is at south face of "salt" cell) |
183 |
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C Advective component of meridional flux |
184 |
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DO j=jMin,jMax |
185 |
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DO i=iMin,iMax |
186 |
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C Advective component of meridional flux |
187 |
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af(i,j) = |
188 |
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& vTrans(i,j)*(salt(i,j,k,bi,bj)+salt(i,j-1,k,bi,bj))*0.5 _d 0 |
189 |
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ENDDO |
190 |
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ENDDO |
191 |
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C Diffusive component of meridional flux |
192 |
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DO j=jMin,jMax |
193 |
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DO i=iMin,iMax |
194 |
adcroft |
1.21 |
df(i,j) = -diffKhS*yA(i,j)*dSdy(i,j) |
195 |
cnh |
1.1 |
ENDDO |
196 |
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ENDDO |
197 |
adcroft |
1.21 |
#ifdef ALLOW_GMREDI |
198 |
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IF (use_GMRedi) CALL GMREDI_YTRANSPORT( |
199 |
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I iMin,iMax,jMin,jMax,bi,bj,K, |
200 |
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I yA,salt, |
201 |
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U df, |
202 |
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I myThid) |
203 |
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#endif |
204 |
adcroft |
1.19 |
C o Add the bi-harmonic contribution |
205 |
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IF (diffK4S .NE. 0.) THEN |
206 |
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DO j=jMin,jMax |
207 |
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DO i=iMin,iMax |
208 |
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df(i,j) = df(i,j) + yA(i,j)* |
209 |
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& diffK4S*(df4(i,j)-df4(i,j-1))*_recip_dyC(i,j,bi,bj) |
210 |
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ENDDO |
211 |
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ENDDO |
212 |
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ENDIF |
213 |
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214 |
cnh |
1.1 |
C Net meridional flux |
215 |
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DO j=jMin,jMax |
216 |
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DO i=iMin,iMax |
217 |
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fMer(i,j) = afFacS*af(i,j) + dfFacS*df(i,j) |
218 |
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ENDDO |
219 |
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ENDDO |
220 |
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221 |
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C-- Vertical flux (fVerS) above |
222 |
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C Advective component of vertical flux |
223 |
adcroft |
1.7 |
C Note: For K=1 then KM1=1 this gives a barZ(T) = T |
224 |
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C (this plays the role of the free-surface correction) |
225 |
cnh |
1.1 |
DO j=jMin,jMax |
226 |
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DO i=iMin,iMax |
227 |
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af(i,j) = |
228 |
cnh |
1.12 |
& rTrans(i,j)*(salt(i,j,k,bi,bj)+salt(i,j,kM1,bi,bj))*0.5 _d 0 |
229 |
cnh |
1.1 |
ENDDO |
230 |
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ENDDO |
231 |
adcroft |
1.21 |
C o Diffusive component of vertical flux |
232 |
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C Note: For K=1 then KM1=1 and this gives a dS/dr = 0 upper |
233 |
adcroft |
1.7 |
C boundary condition. |
234 |
adcroft |
1.21 |
IF (implicitDiffusion) THEN |
235 |
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DO j=jMin,jMax |
236 |
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DO i=iMin,iMax |
237 |
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df(i,j) = 0. |
238 |
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ENDDO |
239 |
cnh |
1.1 |
ENDDO |
240 |
adcroft |
1.21 |
ELSE |
241 |
adcroft |
1.7 |
DO j=jMin,jMax |
242 |
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DO i=iMin,iMax |
243 |
adcroft |
1.21 |
df(i,j) = - _rA(i,j,bi,bj)*( |
244 |
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& KappaRS(i,j,k)*recip_drC(k) |
245 |
cnh |
1.13 |
& *(salt(i,j,kM1,bi,bj)-salt(i,j,k,bi,bj))*rkFac |
246 |
adcroft |
1.7 |
& ) |
247 |
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ENDDO |
248 |
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ENDDO |
249 |
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ENDIF |
250 |
adcroft |
1.21 |
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251 |
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#ifdef ALLOW_GMREDI |
252 |
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IF (use_GMRedi) CALL GMREDI_RTRANSPORT( |
253 |
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I iMin,iMax,jMin,jMax,bi,bj,K, |
254 |
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I maskUp,salt, |
255 |
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U df, |
256 |
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I myThid) |
257 |
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#endif |
258 |
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259 |
adcroft |
1.18 |
#ifdef ALLOW_KPP |
260 |
adcroft |
1.21 |
C-- Add non-local KPP transport term (ghat) to diffusive salt flux. |
261 |
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IF (use_KPPmixing) CALL KPP_TRANSPORT_S( |
262 |
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I iMin,iMax,jMin,jMax,bi,bj,k,km1, |
263 |
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I maskC,KappaRS, |
264 |
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U df ) |
265 |
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#endif |
266 |
adcroft |
1.18 |
|
267 |
cnh |
1.1 |
C Net vertical flux |
268 |
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DO j=jMin,jMax |
269 |
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DO i=iMin,iMax |
270 |
adcroft |
1.7 |
fVerS(i,j,kUp) = ( afFacS*af(i,j)+ dfFacS*df(i,j) )*maskUp(i,j) |
271 |
cnh |
1.1 |
ENDDO |
272 |
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ENDDO |
273 |
adcroft |
1.7 |
IF ( TOP_LAYER ) THEN |
274 |
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DO j=jMin,jMax |
275 |
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DO i=iMin,iMax |
276 |
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fVerS(i,j,kUp) = afFacS*af(i,j)*freeSurfFac |
277 |
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ENDDO |
278 |
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ENDDO |
279 |
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ENDIF |
280 |
cnh |
1.1 |
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281 |
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C-- Tendency is minus divergence of the fluxes. |
282 |
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C Note. Tendency terms will only be correct for range |
283 |
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C i=iMin+1:iMax-1, j=jMin+1:jMax-1. Edge points |
284 |
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C will contain valid floating point numbers but |
285 |
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C they are not algorithmically correct. These points |
286 |
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C are not used. |
287 |
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DO j=jMin,jMax |
288 |
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DO i=iMin,iMax |
289 |
cnh |
1.15 |
#define _recip_VolS1(i,j,k,bi,bj) _recip_hFacC(i,j,k,bi,bj)*recip_drF(k) |
290 |
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#define _recip_VolS2(i,j,k,bi,bj) /_rA(i,j,bi,bj) |
291 |
cnh |
1.1 |
gS(i,j,k,bi,bj)= |
292 |
cnh |
1.15 |
& -_recip_VolS1(i,j,k,bi,bj) |
293 |
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& _recip_VolS2(i,j,k,bi,bj) |
294 |
cnh |
1.1 |
& *( |
295 |
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& +( fZon(i+1,j)-fZon(i,j) ) |
296 |
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& +( fMer(i,j+1)-fMer(i,j) ) |
297 |
cnh |
1.12 |
& +( fVerS(i,j,kUp)-fVerS(i,j,kDown) )*rkFac |
298 |
cnh |
1.1 |
& ) |
299 |
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ENDDO |
300 |
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ENDDO |
301 |
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302 |
cnh |
1.16 |
C-- External forcing term(s) |
303 |
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CALL EXTERNAL_FORCING_S( |
304 |
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I iMin,iMax,jMin,jMax,bi,bj,k, |
305 |
cnh |
1.17 |
I maskC, |
306 |
cnh |
1.16 |
I myCurrentTime,myThid) |
307 |
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308 |
cnh |
1.17 |
#ifdef INCLUDE_LAT_CIRC_FFT_FILTER_CODE |
309 |
cnh |
1.16 |
C-- |
310 |
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CALL FILTER_LATCIRCS_FFT_APPLY( gS, 1, sNy, k, k, bi, bj, 1, myThid) |
311 |
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#endif |
312 |
cnh |
1.1 |
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313 |
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RETURN |
314 |
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END |