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C $Header: /u/gcmpack/models/MITgcmUV/model/src/ini_spherical_polar_grid.F,v 1.17.2.3 2001/04/08 21:58:27 cnh Exp $ |
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cnh |
1.17 |
C $Name: $ |
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cnh |
1.1 |
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cnh |
1.10 |
#include "CPP_OPTIONS.h" |
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cnh |
1.1 |
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adcroft |
1.15 |
#undef USE_BACKWARD_COMPATIBLE_GRID |
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cnh |
1.1 |
CStartOfInterface |
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SUBROUTINE INI_SPHERICAL_POLAR_GRID( myThid ) |
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C /==========================================================\ |
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C | SUBROUTINE INI_SPHERICAL_POLAR_GRID | |
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C | o Initialise model coordinate system | |
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C |==========================================================| |
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C | These arrays are used throughout the code in evaluating | |
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C | gradients, integrals and spatial avarages. This routine | |
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C | is called separately by each thread and initialise only | |
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C | the region of the domain it is "responsible" for. | |
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C | Notes: | |
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C | Two examples are included. One illustrates the | |
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C | initialisation of a cartesian grid. The other shows the | |
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C | inialisation of a spherical polar grid. Other orthonormal| |
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C | grids can be fitted into this design. In this case | |
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C | custom metric terms also need adding to account for the | |
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C | projections of velocity vectors onto these grids. | |
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C | The structure used here also makes it possible to | |
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C | implement less regular grid mappings. In particular | |
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C | o Schemes which leave out blocks of the domain that are | |
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C | all land could be supported. | |
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C | o Multi-level schemes such as icosohedral or cubic | |
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C | grid projections onto a sphere can also be fitted | |
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C | within the strategy we use. | |
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C | Both of the above also require modifying the support | |
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C | routines that map computational blocks to simulation | |
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C | domain blocks. | |
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C | Under the spherical polar grid mode primitive distances | |
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C | in X and Y are in degrees. Distance in Z are in m or Pa | |
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C | depending on the vertical gridding mode. | |
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C \==========================================================/ |
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1.12 |
IMPLICIT NONE |
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1.1 |
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C === Global variables === |
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#include "SIZE.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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C == Routine arguments == |
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C myThid - Number of this instance of INI_CARTESIAN_GRID |
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INTEGER myThid |
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CEndOfInterface |
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C == Local variables == |
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C xG, yG - Global coordinate location. |
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C xBase - South-west corner location for process. |
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C yBase |
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1.15 |
C zUpper - Work arrays for upper and lower |
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C zLower cell-face heights. |
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C phi - Temporary scalar |
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1.1 |
C iG, jG - Global coordinate index. Usually used to hold |
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C the south-west global coordinate of a tile. |
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C bi,bj - Loop counters |
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C zUpper - Temporary arrays holding z coordinates of |
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C zLower upper and lower faces. |
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C xBase - Lower coordinate for this threads cells |
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C yBase |
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C lat, latN, - Temporary variables used to hold latitude |
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C latS values. |
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C I,J,K |
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INTEGER iG, jG |
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INTEGER bi, bj |
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1.14 |
INTEGER I, J |
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1.15 |
_RL lat, dlat, dlon, xG0, yG0 |
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C "Long" real for temporary coordinate calculation |
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C NOTICE the extended range of indices!! |
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_RL xGloc(1-Olx:sNx+Olx+1,1-Oly:sNy+Oly+1) |
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_RL yGloc(1-Olx:sNx+Olx+1,1-Oly:sNy+Oly+1) |
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1.18 |
C The functions iGl, jGl return the "global" index with valid values beyond |
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C halo regions |
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1.18 |
C cnh wrote: |
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C > I don't understand why we would ever have to multiply the |
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C > overlap by the total domain size e.g |
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C > OLx*Nx, OLy*Ny. |
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C > Can anybody explain? Lines are in ini_spherical_polar_grid.F. |
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C > Surprised the code works if its wrong, so I am puzzled. |
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C jmc relied: |
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C Yes, I can explain this since I put this modification to work |
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C with small domain (where Oly > Ny, as for instance, zonal-average |
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C case): |
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C This has no effect on the acuracy of the evaluation of iGl(I,bi) |
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C and jGl(J,bj) since we take mod(a+OLx*Nx,Nx) and mod(b+OLy*Ny,Ny). |
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C But in case a or b is negative, then the FORTRAN function "mod" |
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C does not return the matematical value of the "modulus" function, |
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C and this is not good for your purpose. |
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C This is why I add +OLx*Nx and +OLy*Ny to be sure that the 1rst |
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C argument of the mod function is positive. |
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1.15 |
INTEGER iGl,jGl |
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iGl(I,bi) = 1+mod(myXGlobalLo-1+(bi-1)*sNx+I+Olx*Nx-1,Nx) |
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jGl(J,bj) = 1+mod(myYGlobalLo-1+(bj-1)*sNy+J+Oly*Ny-1,Ny) |
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cnh |
1.1 |
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1.18 |
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1.15 |
C For each tile ... |
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1.1 |
DO bj = myByLo(myThid), myByHi(myThid) |
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DO bi = myBxLo(myThid), myBxHi(myThid) |
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1.15 |
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C-- "Global" index (place holder) |
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jG = myYGlobalLo + (bj-1)*sNy |
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1.1 |
iG = myXGlobalLo + (bi-1)*sNx |
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1.15 |
C-- First find coordinate of tile corner (meaning outer corner of halo) |
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xG0 = thetaMin |
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C Find the X-coordinate of the outer grid-line of the "real" tile |
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DO i=1, iG-1 |
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xG0 = xG0 + delX(i) |
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ENDDO |
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C Back-step to the outer grid-line of the "halo" region |
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DO i=1, Olx |
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xG0 = xG0 - delX( 1+mod(Olx*Nx-1+iG-i,Nx) ) |
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ENDDO |
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C Find the Y-coordinate of the outer grid-line of the "real" tile |
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yG0 = phiMin |
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DO j=1, jG-1 |
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yG0 = yG0 + delY(j) |
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ENDDO |
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C Back-step to the outer grid-line of the "halo" region |
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DO j=1, Oly |
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yG0 = yG0 - delY( 1+mod(Oly*Ny-1+jG-j,Ny) ) |
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ENDDO |
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C-- Calculate coordinates of cell corners for N+1 grid-lines |
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DO J=1-Oly,sNy+Oly +1 |
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xGloc(1-Olx,J) = xG0 |
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DO I=1-Olx,sNx+Olx |
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c xGloc(I+1,J) = xGloc(I,J) + delX(1+mod(Nx-1+iG-1+i,Nx)) |
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xGloc(I+1,J) = xGloc(I,J) + delX( iGl(I,bi) ) |
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ENDDO |
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ENDDO |
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DO I=1-Olx,sNx+Olx +1 |
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yGloc(I,1-Oly) = yG0 |
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DO J=1-Oly,sNy+Oly |
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c yGloc(I,J+1) = yGloc(I,J) + delY(1+mod(Ny-1+jG-1+j,Ny)) |
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yGloc(I,J+1) = yGloc(I,J) + delY( jGl(J,bj) ) |
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ENDDO |
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ENDDO |
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C-- Make a permanent copy of [xGloc,yGloc] in [xG,yG] |
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DO J=1-Oly,sNy+Oly |
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DO I=1-Olx,sNx+Olx |
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xG(I,J,bi,bj) = xGloc(I,J) |
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yG(I,J,bi,bj) = yGloc(I,J) |
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ENDDO |
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ENDDO |
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C-- Calculate [xC,yC], coordinates of cell centers |
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DO J=1-Oly,sNy+Oly |
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DO I=1-Olx,sNx+Olx |
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C by averaging |
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xC(I,J,bi,bj) = 0.25*( |
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& xGloc(I,J)+xGloc(I+1,J)+xGloc(I,J+1)+xGloc(I+1,J+1) ) |
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yC(I,J,bi,bj) = 0.25*( |
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& yGloc(I,J)+yGloc(I+1,J)+yGloc(I,J+1)+yGloc(I+1,J+1) ) |
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ENDDO |
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ENDDO |
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C-- Calculate [dxF,dyF], lengths between cell faces (through center) |
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DO J=1-Oly,sNy+Oly |
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DO I=1-Olx,sNx+Olx |
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C by averaging |
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c dXF(I,J,bi,bj) = 0.5*(dXG(I,J,bi,bj)+dXG(I,J+1,bi,bj)) |
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c dYF(I,J,bi,bj) = 0.5*(dYG(I,J,bi,bj)+dYG(I+1,J,bi,bj)) |
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C by formula |
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lat = yC(I,J,bi,bj) |
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dlon = delX( iGl(I,bi) ) |
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dlat = delY( jGl(J,bj) ) |
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dXF(I,J,bi,bj) = rSphere*COS(deg2rad*lat)*dlon*deg2rad |
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#ifdef USE_BACKWARD_COMPATIBLE_GRID |
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dXF(I,J,bi,bj) = delX(iGl(I,bi))*deg2rad*rSphere* |
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& COS(yc(I,J,bi,bj)*deg2rad) |
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#endif /* USE_BACKWARD_COMPATIBLE_GRID */ |
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dYF(I,J,bi,bj) = rSphere*dlat*deg2rad |
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ENDDO |
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ENDDO |
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C-- Calculate [dxG,dyG], lengths along cell boundaries |
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DO J=1-Oly,sNy+Oly |
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DO I=1-Olx,sNx+Olx |
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C by averaging |
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c dXG(I,J,bi,bj) = 0.5*(dXF(I,J,bi,bj)+dXF(I,J-1,bi,bj)) |
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c dYG(I,J,bi,bj) = 0.5*(dYF(I,J,bi,bj)+dYF(I-1,J,bi,bj)) |
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C by formula |
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lat = 0.5*(yGloc(I,J)+yGloc(I+1,J)) |
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dlon = delX( iGl(I,bi) ) |
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dlat = delY( jGl(J,bj) ) |
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dXG(I,J,bi,bj) = rSphere*COS(deg2rad*lat)*dlon*deg2rad |
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adcroft |
1.18 |
if (dXG(I,J,bi,bj).LT.1.) dXG(I,J,bi,bj)=0. |
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adcroft |
1.15 |
dYG(I,J,bi,bj) = rSphere*dlat*deg2rad |
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ENDDO |
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ENDDO |
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C-- The following arrays are not defined in some parts of the halo |
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C region. We set them to zero here for safety. If they are ever |
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C referred to, especially in the denominator then it is a mistake! |
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DO J=1-Oly,sNy+Oly |
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DO I=1-Olx,sNx+Olx |
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dXC(I,J,bi,bj) = 0. |
208 |
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dYC(I,J,bi,bj) = 0. |
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dXV(I,J,bi,bj) = 0. |
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dYU(I,J,bi,bj) = 0. |
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rAw(I,J,bi,bj) = 0. |
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rAs(I,J,bi,bj) = 0. |
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ENDDO |
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ENDDO |
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C-- Calculate [dxC], zonal length between cell centers |
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DO J=1-Oly,sNy+Oly |
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DO I=1-Olx+1,sNx+Olx ! NOTE range |
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C by averaging |
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dXC(I,J,bi,bj) = 0.5D0*(dXF(I,J,bi,bj)+dXF(I-1,J,bi,bj)) |
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C by formula |
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c lat = 0.5*(yC(I,J,bi,bj)+yC(I-1,J,bi,bj)) |
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c dlon = 0.5*(delX( iGl(I,bi) ) + delX( iGl(I-1,bi) )) |
224 |
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c dXC(I,J,bi,bj) = rSphere*COS(deg2rad*lat)*dlon*deg2rad |
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C by difference |
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c lat = 0.5*(yC(I,J,bi,bj)+yC(I-1,J,bi,bj)) |
227 |
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c dlon = (xC(I,J,bi,bj)+xC(I-1,J,bi,bj)) |
228 |
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c dXC(I,J,bi,bj) = rSphere*COS(deg2rad*lat)*dlon*deg2rad |
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cnh |
1.1 |
ENDDO |
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ENDDO |
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adcroft |
1.15 |
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C-- Calculate [dyC], meridional length between cell centers |
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DO J=1-Oly+1,sNy+Oly ! NOTE range |
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DO I=1-Olx,sNx+Olx |
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C by averaging |
236 |
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dYC(I,J,bi,bj) = 0.5*(dYF(I,J,bi,bj)+dYF(I,J-1,bi,bj)) |
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C by formula |
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c dlat = 0.5*(delY( jGl(J,bj) ) + delY( jGl(J-1,bj) )) |
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c dYC(I,J,bi,bj) = rSphere*dlat*deg2rad |
240 |
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C by difference |
241 |
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c dlat = (yC(I,J,bi,bj)+yC(I,J-1,bi,bj)) |
242 |
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c dYC(I,J,bi,bj) = rSphere*dlat*deg2rad |
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cnh |
1.1 |
ENDDO |
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ENDDO |
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adcroft |
1.15 |
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C-- Calculate [dxV,dyU], length between velocity points (through corners) |
247 |
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DO J=1-Oly+1,sNy+Oly ! NOTE range |
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DO I=1-Olx+1,sNx+Olx ! NOTE range |
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C by averaging (method I) |
250 |
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dXV(I,J,bi,bj) = 0.5*(dXG(I,J,bi,bj)+dXG(I-1,J,bi,bj)) |
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dYU(I,J,bi,bj) = 0.5*(dYG(I,J,bi,bj)+dYG(I,J-1,bi,bj)) |
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C by averaging (method II) |
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c dXV(I,J,bi,bj) = 0.5*(dXG(I,J,bi,bj)+dXG(I-1,J,bi,bj)) |
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c dYU(I,J,bi,bj) = 0.5*(dYC(I,J,bi,bj)+dYC(I-1,J,bi,bj)) |
255 |
cnh |
1.1 |
ENDDO |
256 |
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ENDDO |
257 |
adcroft |
1.15 |
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258 |
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C-- Calculate vertical face area (tracer cells) |
259 |
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DO J=1-Oly,sNy+Oly |
260 |
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DO I=1-Olx,sNx+Olx |
261 |
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lat=0.5*(yGloc(I,J)+yGloc(I+1,J)) |
262 |
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dlon=delX( iGl(I,bi) ) |
263 |
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dlat=delY( jGl(J,bj) ) |
264 |
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rA(I,J,bi,bj) = rSphere*rSphere*dlon*deg2rad |
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& *abs( sin((lat+dlat)*deg2rad)-sin(lat*deg2rad) ) |
266 |
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#ifdef USE_BACKWARD_COMPATIBLE_GRID |
267 |
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lat=yC(I,J,bi,bj)-delY( jGl(J,bj) )*0.5 _d 0 |
268 |
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lon=yC(I,J,bi,bj)+delY( jGl(J,bj) )*0.5 _d 0 |
269 |
cnh |
1.8 |
rA(I,J,bi,bj) = dyF(I,J,bi,bj) |
270 |
adcroft |
1.15 |
& *rSphere*(SIN(lon*deg2rad)-SIN(lat*deg2rad)) |
271 |
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#endif /* USE_BACKWARD_COMPATIBLE_GRID */ |
272 |
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ENDDO |
273 |
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ENDDO |
274 |
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275 |
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C-- Calculate vertical face area (u cells) |
276 |
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DO J=1-Oly,sNy+Oly |
277 |
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DO I=1-Olx+1,sNx+Olx ! NOTE range |
278 |
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C by averaging |
279 |
adcroft |
1.11 |
rAw(I,J,bi,bj) = 0.5*(rA(I,J,bi,bj)+rA(I-1,J,bi,bj)) |
280 |
adcroft |
1.15 |
C by formula |
281 |
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c lat=yGloc(I,J) |
282 |
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c dlon=0.5*( delX( iGl(I,bi) ) + delX( iGl(I-1,bi) ) ) |
283 |
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c dlat=delY( jGl(J,bj) ) |
284 |
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c rAw(I,J,bi,bj) = rSphere*rSphere*dlon*deg2rad |
285 |
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c & *abs( sin((lat+dlat)*deg2rad)-sin(lat*deg2rad) ) |
286 |
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ENDDO |
287 |
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ENDDO |
288 |
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289 |
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C-- Calculate vertical face area (v cells) |
290 |
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DO J=1-Oly,sNy+Oly |
291 |
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DO I=1-Olx,sNx+Olx |
292 |
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C by formula |
293 |
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lat=yC(I,J,bi,bj) |
294 |
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dlon=delX( iGl(I,bi) ) |
295 |
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dlat=0.5*( delY( jGl(J,bj) ) + delY( jGl(J-1,bj) ) ) |
296 |
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rAs(I,J,bi,bj) = rSphere*rSphere*dlon*deg2rad |
297 |
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& *abs( sin(lat*deg2rad)-sin((lat-dlat)*deg2rad) ) |
298 |
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#ifdef USE_BACKWARD_COMPATIBLE_GRID |
299 |
|
|
lon=yC(I,J,bi,bj)-delY( jGl(J,bj) ) |
300 |
|
|
lat=yC(I,J,bi,bj) |
301 |
|
|
rAs(I,J,bi,bj) = rSphere*delX(iGl(I,bi))*deg2rad |
302 |
|
|
& *rSphere*(SIN(lat*deg2rad)-SIN(lon*deg2rad)) |
303 |
|
|
#endif /* USE_BACKWARD_COMPATIBLE_GRID */ |
304 |
|
|
IF (abs(lat).GT.90..OR.abs(lat-dlat).GT.90.) rAs(I,J,bi,bj)=0. |
305 |
|
|
ENDDO |
306 |
|
|
ENDDO |
307 |
|
|
|
308 |
|
|
C-- Calculate vertical face area (vorticity points) |
309 |
|
|
DO J=1-Oly,sNy+Oly |
310 |
|
|
DO I=1-Olx,sNx+Olx |
311 |
|
|
C by formula |
312 |
|
|
lat=yC(I,J,bi,bj) |
313 |
|
|
dlon=delX( iGl(I,bi) ) |
314 |
|
|
dlat=0.5*( delY( jGl(J,bj) ) + delY( jGl(J-1,bj) ) ) |
315 |
|
|
rAz(I,J,bi,bj) = rSphere*rSphere*dlon*deg2rad |
316 |
|
|
& *abs( sin(lat*deg2rad)-sin((lat-dlat)*deg2rad) ) |
317 |
|
|
IF (abs(lat).GT.90..OR.abs(lat-dlat).GT.90.) rAz(I,J,bi,bj)=0. |
318 |
|
|
ENDDO |
319 |
|
|
ENDDO |
320 |
|
|
|
321 |
|
|
C-- Calculate trigonometric terms |
322 |
|
|
DO J=1-Oly,sNy+Oly |
323 |
|
|
DO I=1-Olx,sNx+Olx |
324 |
|
|
lat=0.5*(yGloc(I,J)+yGloc(I,J+1)) |
325 |
|
|
tanPhiAtU(i,j,bi,bj)=tan(lat*deg2rad) |
326 |
|
|
lat=0.5*(yGloc(I,J)+yGloc(I+1,J)) |
327 |
|
|
tanPhiAtV(i,j,bi,bj)=tan(lat*deg2rad) |
328 |
adcroft |
1.11 |
ENDDO |
329 |
adcroft |
1.18 |
ENDDO |
330 |
|
|
|
331 |
|
|
C-- Cosine(lat) scaling |
332 |
|
|
DO J=1-OLy,sNy+OLy |
333 |
|
|
jG = myYGlobalLo + (bj-1)*sNy + J-1 |
334 |
|
|
jG = min(max(1,jG),Ny) |
335 |
|
|
IF (cosPower.NE.0.) THEN |
336 |
|
|
cosFacU(J,bi,bj)=COS(yC(1,J,bi,bj)*deg2rad) |
337 |
|
|
& **cosPower |
338 |
|
|
cosFacV(J,bi,bj)=COS((yC(1,J,bi,bj)-0.5*delY(jG))*deg2rad) |
339 |
|
|
& **cosPower |
340 |
|
|
sqcosFacU(J,bi,bj)=sqrt(cosFacU(J,bi,bj)) |
341 |
|
|
sqcosFacV(J,bi,bj)=sqrt(cosFacV(J,bi,bj)) |
342 |
|
|
ELSE |
343 |
|
|
cosFacU(J,bi,bj)=1. |
344 |
|
|
cosFacV(J,bi,bj)=1. |
345 |
|
|
sqcosFacU(J,bi,bj)=1. |
346 |
|
|
sqcosFacV(J,bi,bj)=1. |
347 |
|
|
ENDIF |
348 |
adcroft |
1.11 |
ENDDO |
349 |
adcroft |
1.15 |
|
350 |
|
|
ENDDO ! bi |
351 |
|
|
ENDDO ! bj |
352 |
|
|
|
353 |
cnh |
1.1 |
RETURN |
354 |
|
|
END |