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C $Header: /u/gcmpack/MITgcm/pkg/aim_v23/phy_suflux.F,v 1.1 2002/11/22 17:17:03 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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SUBROUTINE SUFLUX (PSA,TA,QA,RH,ThA,Vsurf2,WVS,CLAT,FOROG, |
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I FMASK,TLAND,TSEA,SWAV,SSR,SLRD, |
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O SPEED0,DRAG,SHF,EVAP,SLRU, |
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O TSFC,TSKIN,T0,Q0, |
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I kGrd,bi,bj,myThid) |
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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-- Input: PSA = norm. surface pressure [p/p0] (2-dim) |
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C-- UA = u-wind (3-dim) |
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C-- VA = v-wind (3-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-- PHI = geopotential (3-dim) |
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C-- PHI0 = surface geopotential (2-dim) |
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C-- FMASK = fractional land-sea mask (2-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-- SWAV = soil wetness availability [0-1] (2-dim) |
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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-- Output: 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-- USTR = u stress (2-dim) |
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C-- VSTR = v stress (2-dim) |
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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-- TSFC = surface temperature (clim.) (2-dim) |
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C-- TSKIN = skin surface temperature (2-dim) |
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C-- U0 = near-surface u-wind (2-dim) |
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C-- V0 = near-surface v-wind (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 Input: 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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|
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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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_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), TLAND(NGP), TSEA(NGP), SWAV(NGP) |
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_RL SSR(NGP), SLRD(NGP) |
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|
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_RL SPEED0(NGP), DRAG(NGP,3), SHF(NGP,3), EVAP(NGP,3) |
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_RL SLRU(NGP), TSFC(NGP), TSKIN(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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|
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#ifdef ALLOW_AIM |
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|
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C-- Local variables: |
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_RL T1(NGP), QSAT0(NGP,2), DENVV(NGP), CDENVV(NGP,2) |
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|
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INTEGER J, K, 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, RDTH |
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_RL FSLAND, FSSEA, QDUMMY, RDUMMY, TL4, TS4 |
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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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T0(J) = FTEMP0*T0(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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|
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DO J=1,NGP |
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TSKIN(J)=TLAND(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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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 2.2 Sensible heat flux (from clim. TS over land) |
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|
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C Stability correction |
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|
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RDTH = FSTAB/DTHETA |
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|
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DO J=1,NGP |
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FSLAND=1.+MIN(DTHETA,MAX(-DTHETA,TSKIN(J)-T1(J)))*RDTH |
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FSSEA =1.+MIN(DTHETA,MAX(-DTHETA, TSEA(J)-T1(J)))*RDTH |
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CDENVV(J,1)=CHL*DENVV(J)*FSLAND |
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CDENVV(J,2)=CHS*DENVV(J)*FSSEA |
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ENDDO |
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|
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DO J=1,NGP |
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SHF(J,1) = CDENVV(J,1)*CP*(TSKIN(J)-T0(J)) |
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SHF(J,2) = CDENVV(J,2)*CP*(TSEA(J) -T0(J)) |
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ENDDO |
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|
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C 2.3 Evaporation |
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|
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CALL SHTORH (0, NGP, TSKIN, PSA, 1. _d 0, QDUMMY, RDUMMY, |
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& QSAT0(1,1), myThid) |
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CALL SHTORH (0, NGP, TSEA , PSA, 1. _d 0, QDUMMY, RDUMMY, |
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& QSAT0(1,2), myThid) |
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|
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DO J=1,NGP |
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C EVAP(J,1) = CDENVV(J,1)*SWAV(J)*MAX(0. _d 0,QSAT0(J,1)-Q0(J)) |
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c EVAP(J,1) = CDENVV(J,1)*MAX(0. _d 0,SWAV(J)*QSAT0(J,1)-Q0(J)) |
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Cjmc: try the other formulation (= described in F.M paper): |
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EVAP(J,1) = CDENVV(J,1)*SWAV(J)*MAX(0. _d 0,QSAT0(J,1)-Q0(J)) |
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EVAP(J,2) = CDENVV(J,2)* (QSAT0(J,2)-Q0(J)) |
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ENDDO |
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|
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C 2.4 Emission of lw radiation from the surface |
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|
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DO J=1,NGP |
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TL4 = TSKIN(J)**4 |
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TS4 = TSEA(J) **4 |
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SLRU(J) = SBC*(TS4+FMASK(J)*(TL4-TS4)) |
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ENDDO |
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|
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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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|
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C-- 4. Weighted average of surface fluxes and temperatures |
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C-- according to land-sea mask |
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|
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DO J=1,NGP |
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c USTR(J,3) = USTR(J,2)+FMASK(J)*(USTR(J,1)-USTR(J,2)) |
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c VSTR(J,3) = VSTR(J,2)+FMASK(J)*(VSTR(J,1)-VSTR(J,2)) |
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DRAG(J,3) = DRAG(J,2)+FMASK(J)*(DRAG(J,1)-DRAG(J,2)) |
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SHF(J,3) = SHF(J,2)+FMASK(J)*( SHF(J,1)- SHF(J,2)) |
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EVAP(J,3) = EVAP(J,2)+FMASK(J)*(EVAP(J,1)-EVAP(J,2)) |
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ENDDO |
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|
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DO J=1,NGP |
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TSFC(J) = TSEA(J)+FMASK(J)*(TLAND(J)-TSEA(J)) |
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TSKIN(J) = TSEA(J)+FMASK(J)*(TSKIN(J)-TSEA(J)) |
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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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|
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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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