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C $Header: /u/gcmpack/MITgcm_contrib/dgoldberg/streamice/streamice_advect_thickness_y.F,v 1.2 2012/05/17 21:30:17 heimbach Exp $ |
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C $Name: $ |
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#include "STREAMICE_OPTIONS.h" |
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C---+----1----+----2----+----3----+----4----+----5----+----6----+----7-|--+----| |
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SUBROUTINE STREAMICE_ADVECT_THICKNESS_Y ( myThid , |
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O hflux_y , |
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O h , |
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I time_step ) |
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IMPLICIT NONE |
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C O hflux_y ! flux per unit width across face |
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C O h |
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C I time_step |
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C === Global variables === |
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#include "SIZE.h" |
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#include "GRID.h" |
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#include "EEPARAMS.h" |
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#include "PARAMS.h" |
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#include "STREAMICE.h" |
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INTEGER myThid |
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_RL hflux_y (1-Olx:sNx+Olx,1-Oly:sNy+Oly,nSx,nSy) |
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_RL h (1-Olx:sNx+Olx,1-Oly:sNy+Oly,nSx,nSy) |
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_RL time_step |
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#ifdef ALLOW_STREAMICE |
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C LOCAL VARIABLES |
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INTEGER i, j, bi, bj, Gi, Gj, k |
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_RL vface, phi |
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_RL stencil (-1:1) |
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LOGICAL H0_valid(1-Olx:sNx+Olx,1-Oly:sNy+Oly,nSx,nSy) |
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! there are valid cells to calculate a |
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! slope-limited 2nd order flux |
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_RL SLOPE_LIMITER |
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external SLOPE_LIMITER |
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DO bj=myByLo(myThid),myByHi(myThid) |
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DO bi=myBxLo(myThid),myBxHi(myThid) |
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DO j=1-oly,sNy+oly |
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DO i=1-olx,sNx+olx |
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H0_valid(i,j,bi,bj)=.false. |
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ENDDO |
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ENDDO |
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ENDDO |
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ENDDO |
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DO bj=myByLo(myThid),myByHi(myThid) |
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DO bi=myBxLo(myThid),myBxHi(myThid) |
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DO j=1-1,sNy+2 |
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Gj = (myYGlobalLo-1)+(bj-1)*sNy+j |
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DO i=1-2,sNx+2 |
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Gi = (myXGlobalLo-1)+(bi-1)*sNx+i |
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IF ((Gi.ge.1) .and. (Gi.le.Nx)) THEN |
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C THESE ARRAY BOUNDS INSURE THAT AFTER THIS STEP, |
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C VALUES WILL BE RELIABLE 1 GRID CELLS OUT IN THE |
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C Y DIRECTION |
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IF ((STREAMICE_hmask(i,j,bi,bj).eq.1.0) .or. |
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& ((STREAMICE_hmask(i,j-1,bi,bj).eq.1.0) .and. |
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& (STREAMICE_hmask(i,j,bi,bj).ne.1.0))) THEN |
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IF (STREAMICE_vfacemask(i,j,bi,bj).eq.4.0) THEN |
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hflux_y (i,j,bi,bj) = v_flux_bdry_SI (i,j,bi,bj) |
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ELSE |
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vface = .5 * |
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& (V_streamice(i,j,bi,bj)+V_streamice(i+1,j,bi,bj)) |
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IF (vface .gt. 0. _d 0) THEN |
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DO k=-1,1 |
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stencil (k) = h(i,j+k-1,bi,bj) |
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ENDDO |
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IF ((STREAMICE_hmask(i,j,bi,bj).eq.1.0) .and. |
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& (STREAMICE_hmask(i,j-2,bi,bj).eq.1.0)) |
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& H0_valid(i,j,bi,bj)=.true. |
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IF ((STREAMICE_hmask(i,j-1,bi,bj).eq.3.0)) |
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& THEN ! we are at western bdry and there is a thick. bdry cond |
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hflux_y (i,j,bi,bj) = h(i,j-1,bi,bj) * vface |
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! PRINT *, "BOUNDARY FLUX UP", hflux_y (i,j,bi,bj), |
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! & h(i,j-1,bi,bj),vface |
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ELSEIF (H0_valid(i,j,bi,bj)) THEN |
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phi = SLOPE_LIMITER ( |
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& stencil(0)-stencil(-1), |
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& stencil(1)-stencil(0)) |
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hflux_y (i,j,bi,bj) = vface * |
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& (stencil(0) - phi * .5 * (stencil(0)-stencil(1))) |
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ELSE ! one of the two cells needed for a HO scheme is missing, use FO scheme |
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hflux_y (i,j,bi,bj) = vface * stencil(0) |
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ENDIF |
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ELSE ! uface <= 0 |
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DO k=-1,1 |
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stencil (k) = h(i,j-k,bi,bj) |
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ENDDO |
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IF ((STREAMICE_hmask(i,j-1,bi,bj).eq.1.0) .and. |
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& (STREAMICE_hmask(i,j+1,bi,bj).eq.1.0)) |
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& H0_valid(i,j,bi,bj)=.true. |
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IF ((STREAMICE_hmask(i,j,bi,bj).eq.3.0)) |
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& THEN ! we are at western bdry and there is a thick. bdry cond |
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hflux_y (i,j,bi,bj) = h(i,j,bi,bj) * vface |
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! PRINT *, "BOUNDARY FLUX DOWN", hflux_y (i,j,bi,bj), |
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! & h(i,j,bi,bj),vface |
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ELSEIF (H0_valid(i,j,bi,bj)) THEN |
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phi = SLOPE_LIMITER ( |
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& stencil(0)-stencil(-1), |
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& stencil(1)-stencil(0)) |
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hflux_y (i,j,bi,bj) = vface * |
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& (stencil(0) - phi * .5 * (stencil(0)-stencil(1))) |
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ELSE ! one of the two cells needed for a HO scheme is missing, use FO scheme |
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hflux_y (i,j,bi,bj) = vface * stencil(0) |
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ENDIF |
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ENDIF ! uface 0 |
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ENDIF |
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ENDIF |
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ENDIF |
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ENDDO |
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ENDDO |
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ENDDO |
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ENDDO |
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C X-FLUXES AT CELL BOUNDARIES CALCULATED; NOW TAKE FLUX DIVERGENCE TO INCREMENT THICKNESS |
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DO bj=myByLo(myThid),myByHi(myThid) |
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DO bi=myBxLo(myThid),myBxHi(myThid) |
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DO j=1-1,sNy+1 |
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DO i=1-2,sNx+2 |
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Gi = (myXGlobalLo-1)+(bi-1)*sNx+i |
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IF ((Gi .ge. 1) .and. (Gi .le. Nx)) THEN |
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IF (STREAMICE_hmask(i,j,bi,bj).eq.1.0) THEN |
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h(i,j,bi,bj) = h(i,j,bi,bj) - time_step * |
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& (hflux_y(i,j+1,bi,bj)*dxG(i,j+1,bi,bj) - |
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& hflux_y(i,j,bi,bj)*dxG(i,j,bi,bj)) * |
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& recip_rA (i,j,bi,bj) |
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ENDIF |
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ENDIF |
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ENDDO |
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ENDDO |
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ENDDO |
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ENDDO |
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! CALL WRITE_FLD_XY_RL ("h_after_yflux","", |
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! & h, 0, myThid) |
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#endif |
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RETURN |
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END SUBROUTINE STREAMICE_ADVECT_THICKNESS_Y |
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