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C $Header: /u/gcmpack/MITgcm/pkg/aim/phy_suflux.F,v 1.5 2001/09/25 19:53:57 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,UA,VA,TA,QA,RH,QSAT,Vsurfsq,PHI, |
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* PHI0,FMASK,TLAND,TSEA,SWAV,SSR,SLR, |
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* DRAG,USTR,VSTR,SHF,EVAP,T0,Q0,QSAT0,SPEED0, |
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& 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, |
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C-- * USTR,VSTR,SHF,EVAP) |
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C-- |
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C-- Purpose: Compute surface fluxes of momentum, energy and moisture |
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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 (3-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-- SWET = soil wetness availability [0-1] (2-dim) |
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C-- Output: 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 - added (jmc) : |
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C-- Vsurfsq = square of surface wind speed (2-dim,input) |
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C-- ==> UA,VA are no longer used |
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C-- DRAG = surface Drag term (= Cd*Rho*|V|) (2-dim,output) |
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C-- ==> USTR,VSTR are no longer used |
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C-- myThid = Instance number of this instance of the |
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C-- 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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#include "AIM_GRID.h" |
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|
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C Physical constants + functions of sigma and latitude |
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|
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#include "com_physcon.h" |
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|
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C Surface flux constants |
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|
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#include "com_sflcon.h" |
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|
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C-- Routine arguments: |
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INTEGER myThid |
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_RL PSA(NGP), UA(NGP,NLEV), VA(NGP,NLEV), TA(NGP,NLEV), |
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* QA(NGP,NLEV), RH(NGP,NLEV), QSAT(NGP,NLEV), PHI(NGP,NLEV), |
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* PHI0(NGP), FMASK(NGP), TLAND(NGP), TSEA(NGP), SWAV(NGP), |
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* SSR(NGP), SLR(NGP) |
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_RL Vsurfsq(NGP), DRAG(NGP) |
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_RL USTR(NGP,3), VSTR(NGP,3), SHF(NGP,3), EVAP(NGP,3) |
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_RL T0(NGP,2),Q0(NGP),QSAT0(NGP,2), SPEED0(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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_RL U0(NGP),V0(NGP),DENVV(NGP,3) |
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_RL WORK(NGP) |
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INTEGER NL1(NGP) |
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_RL AUX(NGP) |
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C |
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_RL pSurfs(NLEV) |
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DATA pSurfs /75 _d 2,250 _d 2,500 _d 2,775 _d 2,950 _d 2 / |
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C |
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_RL pSurfw(NLEV) |
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DATA pSurfw /150 _d 2,350 _d 2,650 _d 2,900 _d 2,1000 _d 2/ |
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Cchdbg |
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c INTEGER NPAS |
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c SAVE NPAS |
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c LOGICAL Ifirst |
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c SAVE Ifirst |
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c DATA Ifirst /.TRUE./ |
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c _RL T0moy1(NGP) |
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c _RL T0moy2(NGP) |
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c SAVE T0moy2, T0moy1 |
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c _RL denmoy1(NGP) |
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c _RL denmoy2(NGP) |
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c SAVE denmoy1, denmoy2 |
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c _RL Q0moy(NGP) |
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c SAVE Q0moy |
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|
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INTEGER J |
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_RL factwind2 |
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|
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C- jmc: declare all local variables: |
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_RL GTEMP0, GHUM0, RCP, PRD, VG2, DTHETAF, FSTAB, RDTH |
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_RL FSLAND, FSSEA, CHLCP, CHSCP, QDUMMY, RDUMMY |
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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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C |
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C 1.1 Wind components |
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C |
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DO J=1,NGP |
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U0(J) = 0.0 |
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V0(J) = 0.0 |
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IF ( NLEVxyU(J,myThid) .GT. 0 ) THEN |
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U0(J) = FWIND0*UA(J,NLEVxyU(J,myThid)) |
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ENDIF |
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IF ( NLEVxyV(J,myThid) .GT. 0 ) THEN |
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V0(J) = FWIND0*VA(J,NLEVxyV(J,myThid)) |
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ENDIF |
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ENDDO |
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C |
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C 1.2 Temperature |
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C |
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GTEMP0 = 1.D0-FTEMP0 |
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RCP = 1.D0/CP |
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DO J=1,NGP |
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NL1(J)=NLEVxy(J,myThid)-1 |
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ENDDO |
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C |
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DO J=1,NGP |
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IF ( NLEVxy(J,myThid) .GT. 0 ) THEN |
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T0(J,1) = TA(J,NLEVxy(J,myThid))+WVI(NLEVxy(J,myThid),2)* |
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& (TA(J,NLEVxy(J,myThid))-TA(J,NL1(J))) |
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ccccc T0(J,2) = TA(J,NLEVxy(J))+RCP*(PHI(J,NLEVxy(J))-PHI0(J)) |
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T0(J,2) = TA(J,NLEVxy(J,myThid))* |
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& ((Psurfw(NLEVxy(J,myThid))/ |
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& Psurfs(Nlevxy(J,myThid)))**(RD/CP)) |
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ELSE |
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T0(J,1) = 273.16 _d 0 |
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T0(J,2) = 273.16 _d 0 |
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ENDIF |
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ENDDO |
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C |
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DO J=1,NGP |
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T0(J,1) = FTEMP0*T0(J,1)+GTEMP0*T0(J,2) |
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ENDDO |
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C |
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C 1.3 Spec. humidity |
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C |
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GHUM0 = 1. _d 0-FHUM0 |
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C |
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DO J=1,NGP |
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IF ( NLEVxy(J,myThid) .GT. 0 ) THEN |
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WORK(J)=RH(J,Nlevxy(J,myThid)) |
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cchdbg |
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c WORK(J) = RH(J,NLEVxy(J))+WVI(NLEVxy(J),2)* |
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c & (RH(J,NLEVxy(J))-RH(J,NL1(J))) |
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cchdbg |
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ENDIF |
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ENDDO |
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C |
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CALL SHTORH (-1,NGP,T0,PSA,1. _d 0,Q0,WORK,QSAT0,myThid) |
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C |
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DO J=1,NGP |
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IF ( NLEVxy(J,myThid) .GT. 0 ) THEN |
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Q0(J)=FHUM0*Q0(J)+GHUM0*QA(J,NLEVxy(J,myThid)) |
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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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C |
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DO J=1,NGP |
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c_jmc SPEED0(J)=SQRT(U0(J)*U0(J)+V0(J)*V0(J)+VG2) |
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SPEED0(J)=SQRT(factwind2*Vsurfsq(J)+VG2) |
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DENVV(J,3)=(PRD*PSA(J)/T0(J,1))*SPEED0(J) |
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c_jmc DENVV(J,3)=(PRD*PSA(J)/T0(J,1))* |
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c_jmc* SQRT(U0(J)*U0(J)+V0(J)*V0(J)+VG2) |
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cchdbg DENVV(J,3)=0.7*(PRD*PSA(J)/T0(J,1))* |
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cchdbg * SQRT(U0(J)*U0(J)+V0(J)*V0(J)+VG2) |
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ENDDO |
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C |
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C 1.5 Stability correction for heat/moisture fluxes |
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C |
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DTHETAF = 3. _d 0 |
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FSTAB = 0.67 _d 0 |
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RDTH = FSTAB/DTHETAF |
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C |
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DO J=1,NGP |
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FSLAND=1.+MIN(DTHETAF,MAX(-DTHETAF,TLAND(J)-T0(J,2)))*RDTH |
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FSSEA =1.+MIN(DTHETAF,MAX(-DTHETAF, TSEA(J)-T0(J,2)))*RDTH |
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aux(J)=FSLAND |
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DENVV(J,1)=DENVV(J,3)*FSLAND |
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DENVV(J,2)=DENVV(J,3)*FSSEA |
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cchdbg DENVV(J,1)=DENVV(J,3) |
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cchdbg DENVV(J,2)=DENVV(J,3) |
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ENDDO |
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C |
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C-- 2. Computation of fluxes over land and sea |
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C |
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C 2.1 Wind stress |
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C |
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c_jmc DO J=1,NGP |
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c_jmc IF ( NLEVxyu(J) .GT. 0 ) THEN |
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c_jmc USTR(J,1) = -CDL*DENVV(J,3)*UA(J,NLEVxyu(J)) |
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c_jmc USTR(J,2) = -CDS*DENVV(J,3)*UA(J,NLEVxyu(J)) |
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c_jmc ENDIF |
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c_jmc IF ( NLEVxyv(J) .GT. 0 ) THEN |
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c_jmc VSTR(J,1) = -CDL*DENVV(J,3)*VA(J,NLEVxyv(J)) |
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c_jmc VSTR(J,2) = -CDS*DENVV(J,3)*VA(J,NLEVxyv(j)) |
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c_jmc ENDIF |
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c---+----1----+----2----+----3----+----4----+----5----+----6----+----7-|--+----| |
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C Compute surface drag term (= C_drag*|V| ) to allow direct computation |
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C of surface stress on C-grid. |
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C add Land + Sea contributions ; Convert to surface pressure level |
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DO J=1,NGP |
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IF ( NLEVxy(J,myThid) .GT. 0 ) THEN |
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DRAG(J) = ( CDS+FMASK(J)*(CDL-CDS) ) * DENVV(J,3) |
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ELSE |
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DRAG(J) = 0. |
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ENDIF |
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ENDDO |
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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 => USTR,VSTR is no longer used. only here for diagnostic of old version. |
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DO J=1,NGP |
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USTR(J,3) = 0. |
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VSTR(J,3) = 0. |
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IF ( NLEVxyU(J,myThid) .GT. 0 ) |
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& USTR(J,3) = -DRAG(J)*UA(J,NLEVxyU(J,myThid)) |
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IF ( NLEVxyV(J,myThid) .GT. 0 ) |
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& VSTR(J,3) = -DRAG(J)*VA(J,NLEVxyV(J,myThid)) |
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ENDDO |
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c---+----1----+----2----+----3----+----4----+----5----+----6----+----7-|--+----| |
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C |
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C 2.2 Sensible heat flux (from clim. TS over land) |
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C |
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CHLCP = CHL*CP |
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CHSCP = CHS*CP |
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C |
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DO J=1,NGP |
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SHF(J,1) = CHLCP*DENVV(J,1)*(TLAND(J)-T0(J,1)) |
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SHF(J,2) = CHSCP*DENVV(J,2)*(TSEA(J) -T0(J,1)) |
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ENDDO |
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C |
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C **************************************************** |
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cchdbg |
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c IF (Ifirst) then |
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c npas=0. |
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c do J=1,NGP |
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c T0moy1(J)=0. |
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c T0moy2(J)=0. |
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c denmoy1(J)=0. |
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c denmoy2(J)=0. |
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c Q0moy(J)=0. |
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c enddo |
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c ifirst=.false. |
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c ENDIF |
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|
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c npas=npas+1 |
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c DO J=1,NGP |
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c T0moy1(J)=T0moy1(J) + T0(J,1) |
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c T0moy2(J)=T0moy2(J) + T0(J,2) |
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c denmoy1(J)=denmoy1(J) + DENVV(J,1) |
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c denmoy2(J)=denmoy2(J) + DENVV(J,2) |
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c Q0moy(J)=Q0moy(J) + Q0(J) |
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c ENDDO |
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|
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c if(npas.eq.5760) then |
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c DO J=1,NGP |
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c T0moy1(J)=T0moy1(J)/float(npas) |
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c T0moy2(J)=T0moy2(J)/float(npas) |
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c denmoy1(J)=denmoy1(J)/float(npas) |
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c denmoy2(J)=denmoy2(J)/float(npas) |
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c Q0moy(J)=Q0moy(J)/float(npas) |
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c ENDDO |
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|
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c open(73,file='Tmoy1',form='unformatted') |
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c write(73) T0moy1 |
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c close(73) |
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c open(74,file='Tmoy2',form='unformatted') |
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c write(74) T0moy2 |
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c close(74) |
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c open(73,file='denmoy1',form='unformatted') |
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c write(73) denmoy1 |
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c close(73) |
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c open(74,file='denmoy2',form='unformatted') |
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c write(74) denmoy2 |
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c close(74) |
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c open(74,file='Q0moy',form='unformatted') |
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c write(74) Q0moy |
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c close(74) |
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c ENDIF |
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cchdbg |
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C **************************************************** |
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C |
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c CALL DUMP_WRITE2D ( NGP,1,'T0.', nIter,T0 , iErr) |
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c CALL DUMP_WRITE2D ( NGP,3,'DENVV.', nIter,DENVV , iErr) |
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c CALL DUMP_WRITE2D ( NGP,1,'TSEA.', nIter,TSEA , iErr) |
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c CALL DUMP_WRITE2D ( NGP,1,'TLAND.', nIter,TLAND , iErr) |
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c CALL DUMP_WRITE2D ( NGP,1,'AUX.', nIter,aux , iErr) |
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C |
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C 2.3 Evaporation |
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C |
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CALL SHTORH (0,NGP,TLAND,PSA,1. _d 0,QDUMMY,RDUMMY,QSAT0(1,1),myThid) |
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CALL SHTORH (0,NGP,TSEA ,PSA,1. _d 0,QDUMMY,RDUMMY,QSAT0(1,2),myThid) |
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|
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DO J=1,NGP |
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Cdj EVAP(J,1) = CHL*DENVV(J,1)*MAX(0. _d 0,SWAV(J)*QSAT0(J,1)-Q0(J)) |
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EVAP(J,1)=CHL*DENVV(J,1)*MIN(1. _d 0,SWAV(J))*(QSAT0(J,1)-Q0(J)) |
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cdj try new scheme : assume that the net heat flux on land is zero |
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cdj at all time and at all points (this is equivalent |
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cdj to say that the land has a zero heat capacity) |
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cdj EVAP(J,1) = SSR(J)-SLR(J)-SHF(J,1) |
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EVAP(J,2) = CHS*DENVV(J,2)*(QSAT0(J,2)-Q0(J)) |
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C - test(jmc): only positive evaporation : |
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c EVAP(J,1)=CHL*DENVV(J,1)*MAX(0. _d 0,SWAV(J)*(QSAT0(J,1)-Q0(J))) |
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c EVAP(J,2)=CHS*DENVV(J,2)*MAX(0. _d 0,QSAT0(J,2)-Q0(J)) |
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ENDDO |
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|
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|
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C-- 3. Weighted average of fluxes according to land-sea mask |
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|
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DO J=1,NGP |
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c_jmc USTR(J,3) = USTR(J,2)+FMASK(J)*(USTR(J,1)-USTR(J,2)) |
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c_jmc VSTR(J,3) = VSTR(J,2)+FMASK(J)*(VSTR(J,1)-VSTR(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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cdj |
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QSAT0(J,1) = QSAT0(J,2)+FMASK(J)*(QSAT0(J,1)-QSAT0(J,2)) |
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cdj |
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ENDDO |
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|
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C-- |
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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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