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heimbach |
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C $Header: /u/gcmpack/MITgcm/pkg/streamice/streamice_init_varia.F,v 1.6 2011/06/29 16:24:10 dng 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_X ( myThid , |
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O hflux_x , |
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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_x ! 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_x (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 uface, phi |
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_RL stencil (-1:1) |
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LOGICAL H0_valid ! 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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_RL total_vol_out |
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external SLOPE_LIMITER |
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total_vol_out = 0.0 |
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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=1-3,sNy+3 |
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Gj = (myYGlobalLo-1)+(bj-1)*sNy+j |
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IF ((Gj .ge. 1) .and. (Gj .le. Ny)) THEN |
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DO i=1-2,sNx+3 |
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C THESE ARRAY BOUNDS INSURE THAT AFTER THIS STEP, |
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C VALUES WILL BE RELIABLE 2 GRID CELLS OUT IN THE |
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C X DIRECTION AND 3 CELLS OUT IN THE Y DIR |
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IF ((STREAMICE_hmask(i,j,bi,bj).eq.1.0) .or. |
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& ((STREAMICE_hmask(i-1,j,bi,bj).eq.1.0) .and. |
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& (STREAMICE_hmask(i,j,bi,bj).ne.1.0))) THEN |
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Gi = (myXGlobalLo-1)+(bi-1)*sNx+i |
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IF (STREAMICE_ufacemask(i,j,bi,bj).eq.4.0) THEN |
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hflux_x (i,j,bi,bj) = u_flux_bdry_SI (i,j,bi,bj) |
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ELSE |
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uface = .5 * |
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& (U_streamice(i,j,bi,bj)+U_streamice(i,j+1,bi,bj)) |
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IF (uface .gt. 0. _d 0) THEN |
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DO k=-1,1 |
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stencil (k) = h(i+k-1,j,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-2,j,bi,bj).eq.1.0)) H0_valid=.true. |
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IF ((Gi.eq.1).and.(STREAMICE_hmask(i-1,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_x (i,j,bi,bj) = h(i-1,j,bi,bj) * uface |
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ELSEIF (H0_valid) 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_x (i,j,bi,bj) = uface * |
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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_x (i,j,bi,bj) = uface * 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-k,j,bi,bj) |
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ENDDO |
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IF ((STREAMICE_hmask(i-1,j,bi,bj).eq.1.0) .and. |
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& (STREAMICE_hmask(i+1,j,bi,bj).eq.1.0)) H0_valid=.true. |
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IF ((Gi.eq.Nx).and.(STREAMICE_hmask(i+1,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_x (i,j,bi,bj) = h(i+1,j,bi,bj) * uface |
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ELSEIF (H0_valid) 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_x (i,j,bi,bj) = uface * |
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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_x (i,j,bi,bj) = uface * stencil(0) |
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ENDIF |
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ENDIF |
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ENDIF |
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if (streamice_ufacemask(i,j,bi,bj).eq.2.0) THEN |
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total_vol_out = total_vol_out + |
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& hflux_x (i,j,bi,bj) * time_step |
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ENDIF |
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ENDIF |
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ENDDO |
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ENDIF |
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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=1-3,sNy+3 |
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Gj = (myYGlobalLo-1)+(bj-1)*sNy+j |
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IF ((Gj .ge. 1) .and. (Gj .le. Ny)) THEN |
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DO i=1-2,sNx+2 |
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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_x(i+1,j,bi,bj)*dyG(i+1,j,bi,bj) - |
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& hflux_x(i,j,bi,bj)*dyG(i,j,bi,bj)) * |
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& recip_rA (i,j,bi,bj) |
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ENDIF |
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ENDDO |
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ENDIF |
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ENDDO |
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ENDDO |
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ENDDO |
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! PRINT *, "TOTAL VOLUME OUT: ", total_vol_out |
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#endif |
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RETURN |
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END SUBROUTINE STREAMICE_ADVECT_THICKNESS_X |
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