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C $Header: /u/gcmpack/MITgcm/pkg/aim_v23/aim_land_impl.F,v 1.1 2004/03/11 14:33:18 jmc Exp $ |
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C $Name: $ |
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#include "AIM_OPTIONS.h" |
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#ifdef ALLOW_LAND |
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#include "LAND_OPTIONS.h" |
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#endif |
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CBOP |
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C !ROUTINE: AIM_LAND_IMPL |
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C !INTERFACE: |
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SUBROUTINE AIM_LAND_IMPL( |
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I FMASK, dTskin, |
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I Evp0, dEvp, Slr0, dSlr, |
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U sFlx, |
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U Tsurf, EVAP, SLRU, |
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I bi, bj, myTime, myIter, myThid) |
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C !DESCRIPTION: \bv |
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C *==========================================================* |
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C | S/R AIM_LAND_IMPL |
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C | o AIM Interface to the implicit part of the land model |
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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 == Global variables === |
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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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#include "PARAMS.h" |
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#include "AIM_FFIELDS.h" |
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#include "com_physcon.h" |
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c #include "com_physvar.h" |
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#ifdef ALLOW_LAND |
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#include "LAND_SIZE.h" |
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#include "LAND_PARAMS.h" |
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#include "LAND_VARS.h" |
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#endif |
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C !INPUT/OUTPUT PARAMETERS: |
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C == Routine arguments == |
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C FMASK :: land fraction [0-1] |
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C dTskin :: temp. correction for daily-cycle heating [K] |
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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 derivative relative to surf. temp |
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C sFlx :: net surface flux (+=down) 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 Tsurf :: surface temperature (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 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 :: Number of this instance of the routine |
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_RL FMASK(NGP), dTskin(NGP) |
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_RL Evp0(NGP), dEvp(NGP), Slr0(NGP), dSlr(NGP) |
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_RL sFlx(NGP,0:2) |
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_RL Tsurf(NGP), EVAP(NGP), SLRU(NGP) |
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INTEGER bi, bj, myIter, myThid |
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_RL myTime |
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CEOP |
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#ifdef ALLOW_AIM |
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#ifdef ALLOW_LAND |
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C == Local variables == |
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C i,j, I2 :: loop counters |
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C dTsurf :: surf. temp change after 1 implicit time step [oC] |
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_RL dTsurf(NGP) |
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INTEGER i,j, I2 |
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IF ( useLand .AND. land_impl_grT ) THEN |
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C- Initialisation : |
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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- initialize temp. changes and fresh water flux : |
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dTsurf(I2) = 0. |
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land_Pr_m_Ev(i,j,bi,bj) = 0. _d 0 |
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land_EnWFlux(i,j,bi,bj) = 0. _d 0 |
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ENDDO |
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ENDDO |
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IF ( land_calc_snow ) THEN |
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C- Evap of snow: substract Latent Heat of freezing from heatFlux |
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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 ( land_skinT(i,j,bi,bj).LT. 0. _d 0 .OR. |
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& land_hSnow(i,j,bi,bj).GT. 0. _d 0 ) THEN |
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sFlx(I2,0) = sFlx(I2,0) - ALHF*Evp0(I2) |
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sFlx(I2,1) = sFlx(I2,1) - ALHF*EVAP(I2) |
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sFlx(I2,2) = sFlx(I2,2) - ALHF*dEvp(I2) |
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land_EnWFlux(i,j,bi,bj) = -ALHF |
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ENDIF |
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ENDDO |
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ENDDO |
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ENDIF |
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CALL LAND_IMPL_TEMP( |
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I aim_landFr, |
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I dTskin, sFlx, |
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O dTsurf, |
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I bi, bj, myTime, myIter, myThid) |
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C-- Surface B.C. for atmospheric physics: |
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C- Update Surf.Temp., Evap, Upward SW according to surf. temp. changes |
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DO J=1,NGP |
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IF ( dTsurf(J) .GT. 999. ) THEN |
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Tsurf(J) = tFreeze |
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EVAP(J) = Evp0(J) |
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SLRU(J) = Slr0(J) |
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ELSE |
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Tsurf(J) = Tsurf(J)+ dTsurf(J) |
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EVAP(J) = EVAP(J) + dTsurf(J)*dEvp(J) |
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SLRU(J) = SLRU(J) + dTsurf(J)*dSlr(J) |
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ENDIF |
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ENDDO |
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C- Update surface fluxes for Land model: |
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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- net surface downward heat flux : |
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IF ( dTsurf(I2) .GT. 999. ) THEN |
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land_HeatFlx(i,j,bi,bj) = sFlx(I2,0) |
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ELSE |
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land_HeatFlx(i,j,bi,bj) = sFlx(I2,1)+dTsurf(I2)*sFlx(I2,2) |
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ENDIF |
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C- energy flux associated with Evap of Snow |
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land_EnWFlux(i,j,bi,bj) = -land_EnWFlux(i,j,bi,bj)*EVAP(I2) |
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ENDDO |
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ENDDO |
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C- end (if useLand & land_impl_grT) |
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ENDIF |
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#endif /* ALLOW_LAND */ |
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#endif /* ALLOW_AIM */ |
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RETURN |
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END |
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