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C $Header: /u/gcmpack/MITgcm/pkg/aim_v23/aim_aim2sioce.F,v 1.2 2004/05/21 17:34:16 jmc Exp $ |
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C $Name: $ |
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|
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#include "AIM_OPTIONS.h" |
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#ifdef ALLOW_THSICE |
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#include "THSICE_OPTIONS.h" |
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#endif |
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|
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CBOP |
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C !ROUTINE: AIM_AIM2SIOCE |
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C !INTERFACE: |
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SUBROUTINE AIM_AIM2SIOCE( |
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I land_frc, siceFrac, |
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O prcAtm, evpAtm, flxSW, |
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I bi, bj, myTime, myIter, myThid) |
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|
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C !DESCRIPTION: \bv |
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C *==========================================================* |
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C | S/R AIM_AIM2SIOCE |
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C | o Interface between AIM and thSIce pkg or (coupled) ocean |
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C *==========================================================* |
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C | o compute surface fluxes over ocean (ice-free + ice covered) |
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C | for diagnostics, thsice package and (slab, coupled) ocean |
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C *==========================================================* |
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C \ev |
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|
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C !USES: |
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IMPLICIT NONE |
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|
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C == Global variables === |
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C-- size for MITgcm & Physics package : |
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#include "AIM_SIZE.h" |
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|
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#include "EEPARAMS.h" |
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#include "PARAMS.h" |
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#include "FFIELDS.h" |
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|
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C-- Physics package |
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#include "AIM_PARAMS.h" |
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#include "com_physcon.h" |
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#include "com_physvar.h" |
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|
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#ifdef ALLOW_THSICE |
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#include "THSICE_SIZE.h" |
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#include "THSICE_PARAMS.h" |
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#include "THSICE_VARS.h" |
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#endif |
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|
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C updated fields (in commom blocks): |
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C if using thSIce: |
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C Qsw(inp) :: SW radiation through the sea-ice down to the ocean (+=up) |
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C Qsw(out) :: SW radiation down to the ocean (ice-free + ice-covered)(+=up) |
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C Qnet(out) :: Net heat flux out of the ocean (ice-free ocean only)(+=up) |
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C and the Ice-Covered contribution will be added in S/R THSICE_STEP_FWD |
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C EmPmR(out) :: Net fresh water flux out off the ocean (ice-free ocean only) |
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C and the Ice-Covered contribution will be added in S/R THSICE_STEP_FWD |
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C sHeating(in/out) :: air - seaice surface heat flux left to melt the ice |
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C snowPrc(out) :: snow precip over sea-ice |
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C if not using thSIce: |
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C Qsw(out) :: SW radiation down to the ocean (ice-free + ice-covered)(+=up) |
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C Qnet(out) :: Net heat flux out of the ocean (ice-free + ice-covered)(+=up) |
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C EmPmR(out) :: Net fresh water flux out off the ocean (ice-free + ice-covered) |
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|
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C !INPUT/OUTPUT PARAMETERS: |
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C == Routine arguments == |
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C land_frc :: land fraction [0-1] |
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C siceFrac :: sea-ice fraction (relative to full grid-cell) [0-1] |
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C prcAtm :: total precip from the atmosphere [kg/m2/s] |
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C evpAtm :: Evaporation over sea-ice [kg/m2/s] (>0 if evaporate) |
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C flxSW :: net SW heat flux through the ice to the ocean [W/m2] (+=dw) |
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C bi,bj :: Tile index |
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C myTime :: Current time of simulation ( s ) |
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C myIter :: Current iteration number in simulation |
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C myThid :: My Thread Id number |
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_RS land_frc(1-OLx:sNx+OLx,1-OLy:sNy+OLy,nSx,nSy) |
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_RL siceFrac(sNx,sNy) |
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_RL prcAtm(1-OLx:sNx+OLx,1-OLy:sNy+OLy) |
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_RL evpAtm(1-OLx:sNx+OLx,1-OLy:sNy+OLy) |
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_RL flxSW (1-OLx:sNx+OLx,1-OLy:sNy+OLy) |
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INTEGER bi, bj, myIter, myThid |
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_RL myTime |
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CEOP |
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|
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#ifdef ALLOW_AIM |
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C == Local variables == |
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C i,j,I2 :: loop counters |
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C conv_precip :: conversion factor for precip: from g/m2/s to kg/m2/s |
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C conv_EmP :: conversion factor for EmP : from g/m2/s to m/s |
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_RL conv_precip, conv_EmP |
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_RL icFrac, opFrac |
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INTEGER i,j,I2 |
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|
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C-- Initialisation : |
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|
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C-- Atmospheric Physics Fluxes |
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|
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C from g/m2/s to kg/m2/s : |
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conv_Precip = 1. _d -3 |
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C from g/m2/s to m/s : |
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conv_EmP = conv_Precip / rhoConstFresh |
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#ifdef ALLOW_THSICE |
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IF (useThSIce) conv_EmP = conv_Precip / rhofw |
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#endif |
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|
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DO j=1,sNy |
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DO i=1,sNx |
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I2 = i+(j-1)*sNx |
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|
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C- Total Precip (no distinction between ice-covered / ice-free fraction): |
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prcAtm(i,j) = ( PRECNV(I2,myThid) |
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& + PRECLS(I2,myThid) ) |
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|
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C- Net surface heat flux over ice-free ocean (+=down) |
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C note: with aim_splitSIOsFx=F, ice-free & ice covered contribution are |
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C already merged together and Qnet is the mean heat flux over the grid box. |
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Qnet(i,j,bi,bj) = |
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& SSR(I2,2,myThid) |
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& - SLR(I2,2,myThid) |
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& - SHF(I2,2,myThid) |
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& - EVAP(I2,2,myThid)*ALHC |
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|
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C- E-P over ice-free ocean [m/s]: (same as above is aim_splitSIOsFx=F) |
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EmPmR(i,j,bi,bj) = ( EVAP(I2,2,myThid) |
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& - prcAtm(i,j) ) * conv_EmP |
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|
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C- Transfert SW flux at the base of the sea-ice, from Qsw(+=up) to flxSW (+=dw) |
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flxSW(i,j) = -Qsw(i,j,bi,bj) |
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C- Net short wave (ice-free ocean) into the ocean (+=down) |
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Qsw(i,j,bi,bj) = SSR(I2,2,myThid) |
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|
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ENDDO |
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ENDDO |
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|
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#ifdef ALLOW_THSICE |
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IF ( useThSIce ) THEN |
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DO j=1,sNy |
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DO i=1,sNx |
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I2 = i+(j-1)*sNx |
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C- Mixed-Layer Ocean: (for thsice slab_ocean and coupler) |
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IF (land_frc(i,j,bi,bj).EQ.1. _d 0) hOceMxL(i,j,bi,bj) = 0. |
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|
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C- Evaporation over sea-ice: (for thsice) |
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evpAtm(i,j) = EVAP(I2,3,myThid)*conv_precip |
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|
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C- short-wave downward heat flux (ice-free ocean + ice-covered): |
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C note: at this point we already called THSICE_IMPL_TEMP to solved for |
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C seaice temp and SW flux through the ice. SW is not modified after, and |
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C can therefore combine the open-ocean & ice-covered ocean SW fluxes. |
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icFrac = iceMask(i,j,bi,bj) |
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opFrac = 1. _d 0 - icFrac |
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Qsw(i,j,bi,bj) = icFrac*flxSW(i,j) + opFrac*Qsw(i,j,bi,bj) |
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|
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ENDDO |
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ENDDO |
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|
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IF ( aim_energPrecip ) THEN |
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C-- Add energy flux related to Precip. (snow, T_rain) over sea-ice |
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DO j=1,sNy |
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DO i=1,sNx |
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IF ( iceMask(i,j,bi,bj).GT.0. _d 0 ) THEN |
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I2 = i+(j-1)*sNx |
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IF ( EnPrec(I2,myThid).GE.0. _d 0 ) THEN |
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C- positive => add to surface heating |
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sHeating(i,j,bi,bj) = sHeating(i,j,bi,bj) |
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& + EnPrec(I2,myThid)*prcAtm(i,j) |
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snowPrc(i,j,bi,bj) = 0. _d 0 |
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ELSE |
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C- negative => make snow |
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snowPrc(i,j,bi,bj) = prcAtm(i,j)*conv_precip |
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ENDIF |
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ELSE |
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snowPrc(i,j,bi,bj) = 0. _d 0 |
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ENDIF |
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ENDDO |
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ENDDO |
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ENDIF |
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|
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ELSEIF ( aim_splitSIOsFx ) THEN |
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#else /* ALLOW_THSICE */ |
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IF ( aim_splitSIOsFx ) THEN |
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#endif /* ALLOW_THSICE */ |
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C- aim_splitSIOsFx=T: fluxes over sea-ice (3) & ice-free ocean (2) were |
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C computed separately and here we merge the 2 fractions |
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DO j=1,sNy |
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DO i=1,sNx |
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I2 = i+(j-1)*sNx |
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IF ( siceFrac(i,j) .GT. 0. ) THEN |
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icFrac = siceFrac(i,j)/(1. _d 0 - land_frc(i,j,bi,bj)) |
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opFrac = 1. _d 0 - icFrac |
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|
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C- Net surface heat flux over sea-ice + ice-free ocean (+=down) |
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Qnet(i,j,bi,bj) = Qnet(i,j,bi,bj)*opFrac |
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& + ( SSR(I2,3,myThid) |
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& - SLR(I2,3,myThid) |
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& - SHF(I2,3,myThid) |
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& - EVAP(I2,3,myThid)*ALHC |
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& )*icFrac |
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C- E-P over sea-ice + ice-free ocean [m/s]: |
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EmPmR(i,j,bi,bj) = EmPmR(i,j,bi,bj)*opFrac |
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& + ( EVAP(I2,3,myThid) |
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& - prcAtm(i,j) ) * conv_EmP * icFrac |
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|
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C- Net short wave (ice-free ocean) into the ocean (+=down) |
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Qsw(i,j,bi,bj) = opFrac*Qsw(i,j,bi,bj) |
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& + icFrac*SSR(I2,3,myThid) |
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|
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ENDIF |
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ENDDO |
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ENDDO |
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|
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C-- end of If useThSIce / elseif aim_splitSIOsFx blocks |
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ENDIF |
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|
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IF ( aim_energPrecip ) THEN |
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C-- Ice free fraction: Add energy flux related to Precip. (snow, T_rain): |
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DO j=1,sNy |
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DO i=1,sNx |
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I2 = i+(j-1)*sNx |
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Qnet(i,j,bi,bj) = Qnet(i,j,bi,bj) |
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& + EnPrec(I2,myThid)*prcAtm(i,j) |
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ENDDO |
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ENDDO |
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ENDIF |
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|
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DO j=1,sNy |
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DO i=1,sNx |
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C- Total Precip : convert units |
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prcAtm(i,j) = prcAtm(i,j) * conv_precip |
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C- Oceanic convention: Heat flux are > 0 upward ; reverse sign. |
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Qsw(i,j,bi,bj) = -Qsw(i,j,bi,bj) |
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Qnet(i,j,bi,bj)= -Qnet(i,j,bi,bj) |
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ENDDO |
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ENDDO |
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|
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#endif /* ALLOW_AIM */ |
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|
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RETURN |
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END |
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