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C $Header: /u/gcmpack/MITgcm/pkg/aim_v23/phy_suflux_sice.F,v 1.2 2004/04/08 00:14:09 jmc Exp $ |
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jmc |
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C $Name: $ |
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#include "AIM_OPTIONS.h" |
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CBOP |
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C !ROUTINE: SUFLUX_SICE |
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C !INTERFACE: |
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SUBROUTINE SUFLUX_SICE( |
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I PSA, FMASK, EMISloc, |
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I Tsurf, dTskin, SSR, SLRD, |
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I T0, Q0, CDENVV, |
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O SHF, EVAP, SLRU, |
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O Evp0, dEvp, Slr0, dSlr, sFlx, |
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O TSFC, TSKIN, |
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I bi,bj,myThid) |
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C !DESCRIPTION: \bv |
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C *==========================================================* |
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C | S/R SUFLUX_SICE |
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C | o compute surface flux over sea-ice |
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C *==========================================================* |
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C | o contains part of original S/R SUFLUX (Speedy code) |
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C *==========================================================* |
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C \ev |
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C !USES: |
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IMPLICIT NONE |
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C Resolution parameters |
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C-- size for MITgcm & Physics package : |
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#include "AIM_SIZE.h" |
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#include "EEPARAMS.h" |
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C-- Physics package |
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#include "AIM_PARAMS.h" |
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C Physical constants + functions of sigma and latitude |
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#include "com_physcon.h" |
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C Surface flux constants |
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#include "com_sflcon.h" |
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C !INPUT/OUTPUT PARAMETERS: |
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C == Routine Arguments == |
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C-- Input: |
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C PSA :: norm. surface pressure [p/p0] (2-dim) |
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C FMASK :: fractional land-sea mask (2-dim) |
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C EMISloc:: longwave surface emissivity |
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C Tsurf :: surface temperature (2-dim) |
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C dTskin :: temp. correction for daily-cycle heating [K] |
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C SSR :: sfc sw radiation (net flux) (2-dim) |
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C SLRD :: sfc lw radiation (downward flux)(2-dim) |
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C T0 :: near-surface air temperature (2-dim) |
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C Q0 :: near-surface sp. humidity [g/kg](2-dim) |
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C CDENVV :: sensible heat flux coefficient (2-dim) |
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C-- Output: |
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C SHF :: sensible heat flux (2-dim) |
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C EVAP :: evaporation [g/(m^2 s)] (2-dim) |
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C SLRU :: sfc lw radiation (upward flux) (2-dim) |
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C Evp0 :: evaporation computed over freezing surface (Ts=0.oC) |
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C dEvp :: evaporation derivative relative to surf. temp |
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C Slr0 :: upward long wave radiation over freezing surf. |
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C dSlr :: upward long wave rad. derivative relative to surf. temp |
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C sFlx :: net heat flux (+=down) except SW, function of surf. temp Ts: |
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C 0: Flux(Ts=0.oC) ; 1: Flux(Ts^n) ; 2: d.Flux/d.Ts(Ts^n) |
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C TSFC :: surface temperature (clim.) (2-dim) |
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C TSKIN :: skin surface temperature (2-dim) |
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C-- Input: |
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C bi,bj :: tile index |
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C myThid :: Thread number for this instance of the routine |
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C-- |
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_RL PSA(NGP), FMASK(NGP), EMISloc |
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_RL Tsurf(NGP), dTskin(NGP) |
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_RL SSR(NGP), SLRD(NGP) |
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_RL T0(NGP), Q0(NGP), CDENVV(NGP) |
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_RL SHF(NGP), EVAP(NGP), SLRU(NGP) |
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_RL Evp0(NGP), dEvp(NGP), Slr0(NGP), dSlr(NGP), sFlx(NGP,0:2) |
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_RL TSFC(NGP), TSKIN(NGP) |
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INTEGER bi,bj,myThid |
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CEOP |
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#ifdef ALLOW_AIM |
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C-- Local variables: |
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_RL QSAT0(NGP,2) |
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_RL QDUMMY(1), RDUMMY(1), TS2 |
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INTEGER J |
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C---+----1----+----2----+----3----+----4----+----5----+----6----+----7-|--+----| |
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C 1.5 Define effective skin temperature to compensate for |
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C non-linearity of heat/moisture fluxes during the daily cycle |
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DO J=1,NGP |
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c TSKIN(J) = Tsurf(J) + dTskin(J) |
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c TSFC(J)=273.16 _d 0 + dTskin(J) |
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TSKIN(J) = Tsurf(J) |
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TSFC(J)=273.16 _d 0 |
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ENDDO |
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C-- 2. Computation of fluxes over land and sea |
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C 2.1 Wind stress |
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C 2.2 Sensible heat flux (from clim. TS over land) |
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DO J=1,NGP |
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SHF(J) = CDENVV(J)*CP*(TSKIN(J)-T0(J)) |
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sFlx(J,0)= -CDENVV(J)*CP*(TSFC(J) -T0(J)) |
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sFlx(J,1)= -SHF(J) |
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sFlx(J,2)= -CDENVV(J)*CP |
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ENDDO |
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C 2.3 Evaporation |
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CALL SHTORH (2, NGP, TSKIN, PSA, 1. _d 0, QDUMMY, dEvp, |
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& QSAT0(1,1), myThid) |
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CALL SHTORH (0, NGP, TSFC, PSA, 1. _d 0, QDUMMY, RDUMMY, |
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& QSAT0(1,2), myThid) |
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DO J=1,NGP |
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EVAP(J) = CDENVV(J)*(QSAT0(J,1)-Q0(J)) |
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Evp0(J) = CDENVV(J)*(QSAT0(J,2)-Q0(J)) |
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dEvp(J) = CDENVV(J)*dEvp(J) |
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ENDDO |
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C 2.4 Emission of lw radiation from the surface |
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DO J=1,NGP |
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TS2 = TSFC(J)*TSFC(J) |
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Slr0(J) = SBC*TS2*TS2 |
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TS2 = TSKIN(J)*TSKIN(J) |
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SLRU(J) = SBC*TS2*TS2 |
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dSlr(J) = 4. _d 0 *SBC*TS2*TSKIN(J) |
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ENDDO |
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C-- Compute net surface heat flux and its derivative ./. surf. temp. |
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DO J=1,NGP |
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sFlx(J,0)= sFlx(J,0) |
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& - ALHC*Evp0(J) - EMISloc*Slr0(J) + SLRD(J) |
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sFlx(J,1)= sFlx(J,1) |
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& - ALHC*EVAP(J) - EMISloc*SLRU(J) + SLRD(J) |
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sFlx(J,2)= sFlx(J,2) |
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& - ALHC*dEvp(J) - EMISloc*dSlr(J) |
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ENDDO |
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IF ( aim_energPrecip ) THEN |
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C- Evap of snow/ice: substract Latent Heat of freezing from heatFlux |
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DO J=1,NGP |
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sFlx(J,0) = sFlx(J,0) - ALHF*Evp0(J) |
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sFlx(J,1) = sFlx(J,1) - ALHF*EVAP(J) |
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sFlx(J,2) = sFlx(J,2) - ALHF*dEvp(J) |
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ENDDO |
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ENDIF |
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C-- 3. Adjustment of skin temperature and fluxes over land |
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C-- based on energy balance (to be implemented) |
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C <= done separately for each surface type (land,ocean,sea-ice) |
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C---+----1----+----2----+----3----+----4----+----5----+----6----+----7-|--+----| |
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#endif /* ALLOW_AIM */ |
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RETURN |
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END |
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