/[MITgcm]/MITgcm/model/src/ini_spherical_polar_grid.F
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revision 1.4 by cnh, Mon May 25 18:01:32 1998 UTC revision 1.12 by adcroft, Wed Dec 9 16:11:52 1998 UTC
# Line 1  Line 1 
1  C $Header$  C $Header$
2    
3  #include "CPP_EEOPTIONS.h"  #include "CPP_OPTIONS.h"
4    
5  CStartOfInterface  CStartOfInterface
6        SUBROUTINE INI_SPHERICAL_POLAR_GRID( myThid )        SUBROUTINE INI_SPHERICAL_POLAR_GRID( myThid )
# Line 33  C     | Under the spherical polar grid m Line 33  C     | Under the spherical polar grid m
33  C     | in X and Y are in degrees. Distance in Z are in m or Pa  |  C     | in X and Y are in degrees. Distance in Z are in m or Pa  |
34  C     | depending on the vertical gridding mode.                 |  C     | depending on the vertical gridding mode.                 |
35  C     \==========================================================/  C     \==========================================================/
36          IMPLICIT NONE
37    
38  C     === Global variables ===  C     === Global variables ===
39  #include "SIZE.h"  #include "SIZE.h"
# Line 65  C     latS         values. Line 66  C     latS         values.
66  C     I,J,K  C     I,J,K
67        _RL    xG, yG, zG        _RL    xG, yG, zG
68        _RL    phi        _RL    phi
69        _RL    zUpper(Nz), zLower(Nz)        _RL    zUpper(Nr), zLower(Nr)
70        _RL    xBase, yBase        _RL    xBase, yBase
71        INTEGER iG, jG        INTEGER iG, jG
72        INTEGER bi, bj        INTEGER bi, bj
# Line 81  C     Set up my local grid first Line 82  C     Set up my local grid first
82  C     Note: In the spherical polar case delX and delY are given in  C     Note: In the spherical polar case delX and delY are given in
83  C           degrees and are relative to some starting latitude and  C           degrees and are relative to some starting latitude and
84  C           longitude - phiMin and thetaMin.  C           longitude - phiMin and thetaMin.
85          xC0 = thetaMin
86          yC0 = phiMin
87        DO bj = myByLo(myThid), myByHi(myThid)        DO bj = myByLo(myThid), myByHi(myThid)
88         jG = myYGlobalLo + (bj-1)*sNy         jG = myYGlobalLo + (bj-1)*sNy
89         DO bi = myBxLo(myThid), myBxHi(myThid)         DO bi = myBxLo(myThid), myBxHi(myThid)
# Line 100  C           longitude - phiMin and theta Line 103  C           longitude - phiMin and theta
103            xc(I,J,bi,bj)  = xG + delX(iG+i-1)*0.5 _d 0            xc(I,J,bi,bj)  = xG + delX(iG+i-1)*0.5 _d 0
104            yc(I,J,bi,bj)  = yG + delY(jG+j-1)*0.5 _d 0            yc(I,J,bi,bj)  = yG + delY(jG+j-1)*0.5 _d 0
105            xG = xG + delX(iG+I-1)            xG = xG + delX(iG+I-1)
106            dxF(I,J,bi,bj) = delX(iG+i-1)*deg2rad*rSphere*COS(yc(I,J,bi,bj)*deg2rad)            dxF(I,J,bi,bj) = delX(iG+i-1)*deg2rad
107         &    *rSphere*COS(yc(I,J,bi,bj)*deg2rad)
108            dyF(I,J,bi,bj) = delY(jG+j-1)*deg2rad*rSphere            dyF(I,J,bi,bj) = delY(jG+j-1)*deg2rad*rSphere
109           ENDDO           ENDDO
110           yG = yG + delY(jG+J-1)           yG = yG + delY(jG+J-1)
# Line 132  C     dxG, dyG are separations between c Line 136  C     dxG, dyG are separations between c
136        ENDDO        ENDDO
137        _EXCH_XY_R4(dxG, myThid )        _EXCH_XY_R4(dxG, myThid )
138        _EXCH_XY_R4(dyG, myThid )        _EXCH_XY_R4(dyG, myThid )
139  C     dxV, dyU are separations between velocity points along cell faces.  C     dxC, dyC is separation between cell centers
140        DO bj = myByLo(myThid), myByHi(myThid)        DO bj = myByLo(myThid), myByHi(myThid)
141         DO bi = myBxLo(myThid), myBxHi(myThid)         DO bi = myBxLo(myThid), myBxHi(myThid)
142          DO J=1,sNy          DO J=1,sNy
143           DO I=1,sNx           DO I=1,sNx
144            dxV(I,J,bi,bj) = (dxG(I,J,bi,bj)+dxG(I-1,J,bi,bj))*0.5 _d 0            dxC(I,J,bi,bj)    = (dxF(I,J,bi,bj)+dxF(I-1,J,bi,bj))*0.5 _d 0
145            dyU(I,J,bi,bj) = (dyG(I,J,bi,bj)+dyG(I,J-1,bi,bj))*0.5 _d 0            dyC(I,J,bi,bj)    = (dyF(I,J,bi,bj)+dyF(I,J-1,bi,bj))*0.5 _d 0
146           ENDDO           ENDDO
147          ENDDO          ENDDO
148         ENDDO         ENDDO
149        ENDDO        ENDDO
150        _EXCH_XY_R4(dxV, myThid )        _EXCH_XY_R4(dxC, myThid )
151        _EXCH_XY_R4(dyU, myThid )        _EXCH_XY_R4(dyC, myThid )
152  C     dxC, dyC is separation between cell centers  C     dxV, dyU are separations between velocity points along cell faces.
153        DO bj = myByLo(myThid), myByHi(myThid)        DO bj = myByLo(myThid), myByHi(myThid)
154         DO bi = myBxLo(myThid), myBxHi(myThid)         DO bi = myBxLo(myThid), myBxHi(myThid)
155          DO J=1,sNy          DO J=1,sNy
156           DO I=1,sNx           DO I=1,sNx
157            dxC(I,J,bi,bj)    = (dxF(I,J,bi,bj)+dxF(I-1,J,bi,bj))*0.5 _d 0            dxV(I,J,bi,bj) = (dxG(I,J,bi,bj)+dxG(I-1,J,bi,bj))*0.5 _d 0
158            dyC(I,J,bi,bj)    = (dyF(I,J,bi,bj)+dyF(I,J-1,bi,bj))*0.5 _d 0  #ifdef OLD_UV_GEOMETRY
159              dyU(I,J,bi,bj) = (dyG(I,J,bi,bj)+dyG(I,J-1,bi,bj))*0.5 _d 0
160    #else
161              dyU(I,J,bi,bj) = (dyC(I,J,bi,bj)+dyC(I-1,J,bi,bj))*0.5 _d 0
162    #endif
163           ENDDO           ENDDO
164          ENDDO          ENDDO
165         ENDDO         ENDDO
166        ENDDO        ENDDO
167        _EXCH_XY_R4(dxC, myThid )        _EXCH_XY_R4(dxV, myThid )
168        _EXCH_XY_R4(dyC, myThid )        _EXCH_XY_R4(dyU, myThid )
169  C     Calculate recipricols  C     Calculate vertical face area and trigonometric terms
170        DO bj = myByLo(myThid), myByHi(myThid)        DO bj = myByLo(myThid), myByHi(myThid)
171         DO bi = myBxLo(myThid), myBxHi(myThid)         DO bi = myBxLo(myThid), myBxHi(myThid)
172          DO J=1,sNy          DO J=1,sNy
173           DO I=1,sNx           DO I=1,sNx
174            rDxG(I,J,bi,bj)=1.d0/dxG(I,J,bi,bj)            jG = myYGlobalLo + (bj-1)*sNy + J-1
175            rDyG(I,J,bi,bj)=1.d0/dyG(I,J,bi,bj)            latS = yc(i,j,bi,bj)-delY(jG)*0.5 _d 0
176            rDxC(I,J,bi,bj)=1.d0/dxC(I,J,bi,bj)            latN = yc(i,j,bi,bj)+delY(jG)*0.5 _d 0
177            rDyC(I,J,bi,bj)=1.d0/dyC(I,J,bi,bj)  #ifdef OLD_UV_GEOMETRY
178            rDxF(I,J,bi,bj)=1.d0/dxF(I,J,bi,bj)            rA(I,J,bi,bj) = dyF(I,J,bi,bj)
179            rDyF(I,J,bi,bj)=1.d0/dyF(I,J,bi,bj)       &    *rSphere*(SIN(latN*deg2rad)-SIN(latS*deg2rad))
180            rDxV(I,J,bi,bj)=1.d0/dxV(I,J,bi,bj)  #else
181            rDyU(I,J,bi,bj)=1.d0/dyU(I,J,bi,bj)            rA(I,J,bi,bj) = rSphere*delX(iG)*deg2rad
182         &    *rSphere*(SIN(latN*deg2rad)-SIN(latS*deg2rad))
183    #endif
184    C         Area cannot be zero but sin can be if lat if < -90.
185              IF ( rA(I,J,bi,bj) .LT. 0. ) rA(I,J,bi,bj) = -rA(I,J,bi,bj)
186              tanPhiAtU(i,j,bi,bj)=tan(_yC(i,j,bi,bj)*deg2rad)
187              tanPhiAtV(i,j,bi,bj)=tan(latS*deg2rad)
188           ENDDO           ENDDO
189          ENDDO          ENDDO
190         ENDDO         ENDDO
191        ENDDO        ENDDO
192        _EXCH_XY_R4(rDxG, myThid )        _EXCH_XY_R4 (rA       , myThid )
193        _EXCH_XY_R4(rDyG, myThid )        _EXCH_XY_R4 (tanPhiAtU , myThid )
194        _EXCH_XY_R4(rDxC, myThid )        _EXCH_XY_R4 (tanPhiAtV , myThid )
       _EXCH_XY_R4(rDyC, myThid )  
       _EXCH_XY_R4(rDxF, myThid )  
       _EXCH_XY_R4(rDyF, myThid )  
       _EXCH_XY_R4(rDxV, myThid )  
       _EXCH_XY_R4(rDyU, myThid )  
 C     Calculate vertical face area  
195        DO bj = myByLo(myThid), myByHi(myThid)        DO bj = myByLo(myThid), myByHi(myThid)
196         DO bi = myBxLo(myThid), myBxHi(myThid)         DO bi = myBxLo(myThid), myBxHi(myThid)
197          DO J=1,sNy          DO J=1,sNy
198           DO I=1,sNx           DO I=1,sNx
199              iG = myXGlobalLo + (bi-1)*sNx + I-1
200            jG = myYGlobalLo + (bj-1)*sNy + J-1            jG = myYGlobalLo + (bj-1)*sNy + J-1
201            latS = yc(i,j,bi,bj)-delY(jG)*0.5 _d 0            latS = yc(i,j-1,bi,bj)
202            latN = yc(i,j,bi,bj)+delY(jG)*0.5 _d 0            latN = yc(i,j,bi,bj)
203            zA(I,J,bi,bj) = dyF(I,J,bi,bj)  #ifdef OLD_UV_GEOMETRY
204              rAw(I,J,bi,bj) = 0.5*(rA(I,J,bi,bj)+rA(I-1,J,bi,bj))
205              rAs(I,J,bi,bj) = 0.5*(rA(I,J,bi,bj)+rA(I,J-1,bi,bj))
206    #else
207              rAw(I,J,bi,bj) = 0.5*(rA(I,J,bi,bj)+rA(I-1,J,bi,bj))
208              rAs(I,J,bi,bj) = rSphere*delX(iG)*deg2rad
209       &    *rSphere*(SIN(latN*deg2rad)-SIN(latS*deg2rad))       &    *rSphere*(SIN(latN*deg2rad)-SIN(latS*deg2rad))
210    #endif
211           ENDDO           ENDDO
212          ENDDO          ENDDO
213         ENDDO         ENDDO
214        ENDDO        ENDDO
215        _EXCH_XY_R4(zA, myThid )        _EXCH_XY_R4 (rAw      , myThid )
216          _EXCH_XY_R4 (rAs      , myThid )
217  C  C
218        RETURN        RETURN
219        END        END
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