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C $Header: /u/gcmpack/MITgcm/pkg/aim_v23/phy_suflux_prep.F,v 1.2 2004/06/24 23:43:11 jmc Exp $ |
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C $Name: $ |
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|
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#include "AIM_OPTIONS.h" |
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|
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CBOP |
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C !ROUTINE: SUFLUX_PREP |
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C !INTERFACE: |
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SUBROUTINE SUFLUX_PREP( |
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I PSA,TA,QA,RH,ThA,Vsurf2,WVS,CLAT,FOROG, |
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I FMASK,TLAND,TSEA,TSICE,SSR, |
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O SPEED0,DRAG,DENVV,dTskin,T1,T0,Q0, |
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I kGrd,bi,bj,myThid) |
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|
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C !DESCRIPTION: \bv |
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C *==========================================================* |
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C | S/R SUFLUX_PREP |
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C | o prepare surface flux calculation |
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C *==========================================================* |
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C | o contain 1rst part of original S/R SUFLUX (Speedy code) |
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C *==========================================================* |
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C-- |
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C-- SUBROUTINE SUFLUX (PSA,UA,VA,TA,QA,RH,PHI, |
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C-- & PHI0,FMASK,TLAND,TSEA,SWAV,SSR,SLRD, |
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C-- & USTR,VSTR,SHF,EVAP,SLRU, |
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C-- & TSFC,TSKIN,U0,V0,T0,Q0) |
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C-- |
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C-- Purpose: Compute surface fluxes of momentum, energy and moisture, |
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C-- and define surface skin temperature from energy balance |
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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 Resolution parameters |
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|
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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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|
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C Physical constants + functions of sigma and latitude |
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#include "com_physcon.h" |
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|
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C Surface flux constants |
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#include "com_sflcon.h" |
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|
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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 TA :: temperature (3-dim) |
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C QA :: specific humidity [g/kg] (3-dim) |
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C RH :: relative humidity [0-1] (3-dim) |
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C ThA :: Pot.temperature [K] (3-dim) |
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C Vsurf2 :: square of surface wind speed (2-dim,input) |
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C ==> UA,VA are no longer used |
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C WVS :: weights for near surf interp (2-dim) |
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C CLAT :: cos(lat) (2-dim) |
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C FOROG :: orographic factor (surf. drag) (2-dim) |
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C FMASK :: fraction land - sea - sea-ice (2.5-dim) |
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C TLAND :: land-surface temperature (2-dim) |
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C TSEA :: sea-surface temperature (2-dim) |
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C TSICE :: sea-ice surface temperature (2-dim) |
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C SSR :: sfc sw radiation (net flux) (2-dim) |
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C-- Output: |
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C SPEED0 :: effective surface wind speed (2-dim) |
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C DRAG :: surface Drag term (= Cd*Rho*|V|)(2-dim) |
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C ==> USTR,VSTR are no longer used |
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C DENVV :: surface flux (sens,lat.) coeff. (=Rho*|V|) [kg/m2/s] |
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C dTskin :: temp. correction for daily-cycle heating [K] |
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C T1 :: near-surface air temperature (from Pot.Temp) |
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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-- Input: |
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C kGrd :: Ground level index (2-dim) |
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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), TA(NGP,NLEV), QA(NGP,NLEV), RH(NGP,NLEV) |
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_RL ThA(NGP,NLEV) |
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_RL Vsurf2(NGP), WVS(NGP), CLAT(NGP), FOROG(NGP) |
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_RL FMASK(NGP,3), TLAND(NGP), TSEA(NGP), TSICE(NGP) |
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_RL SSR(NGP) |
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|
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_RL SPEED0(NGP), DRAG(NGP,0:3), T1(NGP), DENVV(NGP) |
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_RL dTskin(NGP), T0(NGP), Q0(NGP) |
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|
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INTEGER kGrd(NGP) |
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INTEGER bi,bj,myThid |
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CEOP |
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|
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#ifdef ALLOW_AIM |
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|
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C-- Local variables: |
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_RL QSAT0(NGP,2) |
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|
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INTEGER J, Ktmp, NL1 |
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_RL tmpRH(NGP) |
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_RL factWind2, kappa |
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|
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C- jmc: declare all local variables: |
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_RL GTEMP0, GHUM0, RCP, PRD, VG2 |
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c _RL RDTH, FSLAND, FSSEA, FSSICE |
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C---+----1----+----2----+----3----+----4----+----5----+----6----+----7-|--+----| |
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|
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C-- 1. Extrapolation of wind, temp, hum. and density to the surface |
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|
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C 1.1 Wind components |
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|
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c DO J=1,NGP |
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c U0(J) = 0.0 |
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c V0(J) = 0.0 |
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c Ktmp = kGrd(J) |
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c IF ( Ktmp.GT.0 ) THEN |
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c U0(J) = FWIND0*UA(J,Ktmp) |
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c V0(J) = FWIND0*VA(J,Ktmp) |
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c ENDIF |
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c ENDDO |
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|
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C 1.2 Temperature |
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|
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GTEMP0 = 1.-FTEMP0 |
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RCP = 1. _d 0 /CP |
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kappa = RD/CP |
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C |
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DO J=1,NGP |
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Ktmp = kGrd(J) |
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NL1 = Ktmp-1 |
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IF ( Ktmp.GT.1 ) THEN |
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c_FM T0(J) = TA(J,NLEV)+WVI(NLEV,2)*(TA(J,NLEV)-TA(J,NL1)) |
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c_FM T1(J) = TA(J,NLEV)+RCP*(PHI(J,NLEV)-PHI0(J)) |
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T0(J) = TA(J,Ktmp) + WVS(J)*(TA(J,Ktmp)-TA(J,NL1)) |
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Cjmc: used previously but not valid with partial cell ! |
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c T1(J) = TA(J,Ktmp)*(SIGH(Ktmp)/SIG(Ktmp))**kappa |
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T1(J) = ThA(J,Ktmp)*(PSA(J)**kappa) |
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tmpRH(J)=RH(J,Ktmp) |
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ELSE |
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T0(J) = 273.16 _d 0 |
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T1(J) = 273.16 _d 0 |
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tmpRH(J)= 0. |
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ENDIF |
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ENDDO |
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|
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DO J=1,NGP |
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c T0(J) = FTEMP0*T0(J)+GTEMP0*T1(J) |
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T0(J) = FTEMP0*MIN(T0(J),T1(J))+GTEMP0*T1(J) |
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ENDDO |
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|
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C 1.3 Spec. humidity |
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|
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GHUM0 = 1.-FHUM0 |
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|
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CALL SHTORH (-1,NGP,T0, PSA, 1. _d 0, Q0, tmpRH, QSAT0, myThid) |
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|
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DO J=1,NGP |
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IF ( kGrd(J) .GT. 0 ) THEN |
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Q0(J)=FHUM0*Q0(J)+GHUM0*QA(J,kGrd(J)) |
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ENDIF |
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ENDDO |
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|
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C 1.4 Density * wind speed (including gustiness factor) |
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|
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PRD = P0/RD |
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VG2 = VGUST*VGUST |
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factWind2 = FWIND0*FWIND0 |
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|
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DO J=1,NGP |
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c_FM DENVV(J)=(PRD*PSA(J)/T0(J))* |
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c_FM & SQRT(U0(J)*U0(J)+V0(J)*V0(J)+VG2) |
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SPEED0(J)=SQRT(factWind2*Vsurf2(J)+VG2) |
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DENVV(J)=(PRD*PSA(J)/T0(J))*SPEED0(J) |
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ENDDO |
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|
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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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C Tskin = Tland + dTskin |
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|
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DO J=1,NGP |
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dTskin(J)=CTDAY*CLAT(J)*SSR(J)*PSA(J) |
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ENDDO |
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|
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|
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C-- 2. Computation of fluxes over land and sea |
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|
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C 2.1 Wind stress |
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|
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C Orographic correction |
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|
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DO J=1,NGP |
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c CDENVV(J,1)=CDL*DENVV(J)*FOROG(J) |
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c CDENVV(J,2)=CDS*DENVV(J) |
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DRAG(J,1) = CDL*DENVV(J)*FOROG(J) |
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DRAG(J,2) = CDS*DENVV(J) |
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DRAG(J,3) = CDS*DENVV(J) |
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ENDDO |
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|
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C - Notes: |
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C Because of a different mapping between the Drag and the Wind (A/C-grid) |
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C the surface stress is computed later, in "External Forcing", |
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C Here compute only surface drag term (= C_drag*Rho*|V| ) |
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|
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c DO J=1,NGP |
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c USTR(J,1) = -CDENVV(J,1)*UA(J,NLEV) |
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c VSTR(J,1) = -CDENVV(J,1)*VA(J,NLEV) |
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c USTR(J,2) = -CDENVV(J,2)*UA(J,NLEV) |
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c VSTR(J,2) = -CDENVV(J,2)*VA(J,NLEV) |
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c ENDDO |
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|
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C---+----1----+----2----+----3----+----4----+----5----+----6----+----7-|--+----| |
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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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|
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SUBROUTINE SFLSET (PHI0, FOROG, bi,bj,myThid) |
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C-- |
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C-- SUBROUTINE SFLSET (PHI0) |
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C-- |
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C-- Purpose: compute orographic factor for land surface drag |
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C-- Input: PHI0 = surface geopotential (2-dim) |
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C Output: FOROG = orographic factor (surf. drag) (2-dim) |
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C-- (originally in common blocks: SFLFIX) |
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|
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IMPLICIT NONE |
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|
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C Resolution parameters |
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|
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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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|
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C Physical constants + functions of sigma and latitude |
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#include "com_physcon.h" |
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|
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C Surface flux constants |
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#include "com_sflcon.h" |
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|
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C-- Routine arguments: |
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INTEGER bi,bj,myThid |
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_RL PHI0(NGP) |
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_RL FOROG(NGP) |
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|
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#ifdef ALLOW_AIM |
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|
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C-- Local variables: |
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INTEGER J |
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_RL RHDRAG |
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|
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RHDRAG = 1./(GG*HDRAG) |
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|
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DO J=1,NGP |
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FOROG(J) = 1. _d 0 |
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& + FHDRAG*(1. _d 0 - EXP(-MAX(PHI0(J),0. _d 0)*RHDRAG) ) |
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ENDDO |
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|
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C---+----1----+----2----+----3----+----4----+----5----+----6----+----7-|--+----| |
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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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