C $Header: /u/gcmpack/MITgcm/pkg/thsice/thsice_step_fwd.F,v 1.30 2010/12/17 04:00:14 gforget Exp $
C $Name: $
#include "THSICE_OPTIONS.h"
#ifdef ALLOW_ATM2D
# include "ctrparam.h"
#endif
CBOP
C !ROUTINE: THSICE_STEP_FWD
C !INTERFACE:
SUBROUTINE THSICE_STEP_FWD(
I bi, bj, iMin, iMax, jMin, jMax,
I prcAtm,
I myTime, myIter, myThid )
C !DESCRIPTION: \bv
C *==========================================================*
C | S/R THSICE_STEP_FWD
C | o Step Forward Therm-SeaIce model.
C *==========================================================*
C \ev
C !USES:
IMPLICIT NONE
C === Global variables ===
#include "SIZE.h"
#include "EEPARAMS.h"
#include "PARAMS.h"
#include "FFIELDS.h"
#ifdef ALLOW_ATM2D
# include "ATMSIZE.h"
# include "ATM2D_VARS.h"
#endif
#include "THSICE_SIZE.h"
#include "THSICE_PARAMS.h"
#include "THSICE_VARS.h"
#include "THSICE_TAVE.h"
#ifdef ALLOW_AUTODIFF_TAMC
# include "tamc.h"
# include "tamc_keys.h"
#endif
INTEGER siLo, siHi, sjLo, sjHi
PARAMETER ( siLo = 1-OLx , siHi = sNx+OLx )
PARAMETER ( sjLo = 1-OLy , sjHi = sNy+OLy )
C !INPUT/OUTPUT PARAMETERS:
C === Routine arguments ===
C- input:
C bi,bj :: tile indices
C iMin,iMax :: computation domain: 1rst index range
C jMin,jMax :: computation domain: 2nd index range
C prcAtm :: total precip from the atmosphere [kg/m2/s]
C myTime :: current Time of simulation [s]
C myIter :: current Iteration number in simulation
C myThid :: my Thread Id number
C-- Use fluxes hold in commom blocks
C- input:
C icFlxSW :: net short-wave heat flux (+=down) below sea-ice, into ocean
C icFlxAtm :: net Atmospheric surf. heat flux over sea-ice [W/m2], (+=down)
C icFrwAtm :: evaporation over sea-ice to the atmosphere [kg/m2/s] (+=up)
C- output
C icFlxAtm :: net Atmospheric surf. heat flux over ice+ocean [W/m2], (+=down)
C icFrwAtm :: net fresh-water flux (E-P) from the atmosphere [m/s] (+=up)
INTEGER bi,bj
INTEGER iMin, iMax
INTEGER jMin, jMax
_RL prcAtm(1-OLx:sNx+OLx,1-OLy:sNy+OLy)
_RL myTime
INTEGER myIter
INTEGER myThid
CEOP
#ifdef ALLOW_THSICE
C !LOCAL VARIABLES:
C === Local variables ===
C iceFrac :: fraction of grid area covered in ice
C flx2oc :: net heat flux from the ice to the ocean (+=down) [W/m2]
C frw2oc :: fresh-water flux from the ice to the ocean
C fsalt :: mass salt flux to the ocean
C frzmltMxL :: ocean mixed-layer freezing/melting potential [W/m2]
C tFrzOce :: sea-water freezing temperature [oC] (function of S)
C isIceFree :: true for ice-free grid-cell that remains ice-free
C ageFac :: snow aging factor [1]
C snowFac :: snowing refreshing-age factor [units of 1/snowPr]
LOGICAL isIceFree(1-OLx:sNx+OLx,1-OLy:sNy+OLy)
_RL iceFrac (1-OLx:sNx+OLx,1-OLy:sNy+OLy)
_RL flx2oc (1-OLx:sNx+OLx,1-OLy:sNy+OLy)
_RL frw2oc (1-OLx:sNx+OLx,1-OLy:sNy+OLy)
_RL fsalt (1-OLx:sNx+OLx,1-OLy:sNy+OLy)
_RL tFrzOce (1-OLx:sNx+OLx,1-OLy:sNy+OLy)
_RL frzmltMxL(1-OLx:sNx+OLx,1-OLy:sNy+OLy)
_RL ageFac
_RL snowFac
_RL cphm
_RL opFrac, icFrac
#ifdef ALLOW_DIAGNOSTICS
_RL tmpFac
#endif
INTEGER i,j
LOGICAL dBugFlag
C- define grid-point location where to print debugging values
#include "THSICE_DEBUG.h"
1010 FORMAT(A,1P4E14.6)
C---+----1----+----2----+----3----+----4----+----5----+----6----+----7-|--+----|
#ifdef ALLOW_AUTODIFF_TAMC
act1 = bi - myBxLo(myThid)
max1 = myBxHi(myThid) - myBxLo(myThid) + 1
act2 = bj - myByLo(myThid)
max2 = myByHi(myThid) - myByLo(myThid) + 1
act3 = myThid - 1
max3 = nTx*nTy
act4 = ikey_dynamics - 1
ticekey = (act1 + 1) + act2*max1
& + act3*max1*max2
& + act4*max1*max2*max3
#endif /* ALLOW_AUTODIFF_TAMC */
C- Initialise
dBugFlag = debugLevel.GE.debLevB
DO j = 1-OLy, sNy+OLy
DO i = 1-OLx, sNx+OLx
isIceFree(i,j) = .FALSE.
#ifdef ALLOW_ATM2D
sFluxFromIce(i,j) = 0. _d 0
#else
saltFlux(i,j,bi,bj) = 0. _d 0
#endif
#ifdef ALLOW_AUTODIFF_TAMC
iceFrac(i,j) = 0.
#endif
ENDDO
ENDDO
ageFac = 1. _d 0 - thSIce_deltaT/snowAgTime
snowFac = thSIce_deltaT/(rhos*hNewSnowAge)
#ifdef ALLOW_AUTODIFF_TAMC
CADJ STORE iceMask(:,:,bi,bj) = comlev1_bibj,key=ticekey,byte=isbyte
CADJ STORE iceheight(:,:,bi,bj) = comlev1_bibj,key=ticekey,byte=isbyte
CADJ STORE icfrwatm(:,:,bi,bj) = comlev1_bibj,key=ticekey,byte=isbyte
CADJ STORE qice1(:,:,bi,bj) = comlev1_bibj,key=ticekey,byte=isbyte
CADJ STORE qice2(:,:,bi,bj) = comlev1_bibj,key=ticekey,byte=isbyte
CADJ STORE snowheight(:,:,bi,bj) = comlev1_bibj,key=ticekey,byte=isbyte
#endif
DO j = jMin, jMax
DO i = iMin, iMax
IF (iceMask(i,j,bi,bj).GT.0. _d 0) THEN
C-- Snow aging :
snowAge(i,j,bi,bj) = thSIce_deltaT
& + snowAge(i,j,bi,bj)*ageFac
IF ( snowPrc(i,j,bi,bj).GT.0. _d 0 )
& snowAge(i,j,bi,bj) = snowAge(i,j,bi,bj)
& * EXP( - snowFac*snowPrc(i,j,bi,bj) )
c & * EXP( -(thSIce_deltaT*snowPrc(i,j,bi,bj)/rhos)
c & /hNewSnowAge )
C-------
C note: Any flux of mass (here fresh water) that enter or leave the system
C with a non zero energy HAS TO be counted: add snow precip.
icFlxAtm(i,j,bi,bj) = icFlxAtm(i,j,bi,bj)
& - Lfresh*snowPrc(i,j,bi,bj)
C--
ENDIF
ENDDO
ENDDO
#ifdef ALLOW_DIAGNOSTICS
IF ( useDiagnostics ) THEN
tmpFac = 1. _d 0
CALL DIAGNOSTICS_FILL(iceMask,'SI_FrcFx',0,1,1,bi,bj,myThid)
CALL DIAGNOSTICS_FRACT_FILL(
I snowPrc, iceMask,tmpFac,1,'SIsnwPrc',
I 0,1,1,bi,bj,myThid)
CALL DIAGNOSTICS_FRACT_FILL(
I siceAlb, iceMask,tmpFac,1,'SIalbedo',
I 0,1,1,bi,bj,myThid)
ENDIF
#endif /* ALLOW_DIAGNOSTICS */
DO j = jMin, jMax
DO i = iMin, iMax
siceAlb(i,j,bi,bj) = iceMask(i,j,bi,bj)*siceAlb(i,j,bi,bj)
ENDDO
ENDDO
C---+----1----+----2----+----3----+----4----+----5----+----6----+----7-|--+----|
C part.2 : ice-covered fraction ;
C change in ice/snow thickness and ice-fraction
C note: can only reduce the ice-fraction but not increase it.
C-------
DO j = jMin, jMax
DO i = iMin, iMax
tFrzOce(i,j) = -mu_Tf*sOceMxL(i,j,bi,bj)
cphm = cpwater*rhosw*hOceMxL(i,j,bi,bj)
frzmltMxL(i,j) = ( tFrzOce(i,j)-tOceMxL(i,j,bi,bj) )
& * cphm/ocean_deltaT
iceFrac(i,j) = iceMask(i,j,bi,bj)
flx2oc(i,j) = icFlxSW(i,j,bi,bj)
C-------
#ifdef ALLOW_DBUG_THSICE
IF ( dBug(i,j,bi,bj) ) THEN
IF (frzmltMxL(i,j).GT.0. .OR. iceFrac(i,j).GT.0.) THEN
WRITE(6,'(A,2I4,2I2)') 'ThSI_FWD: i,j=',i,j,bi,bj
WRITE(6,1010) 'ThSI_FWD:-1- iceMask, hIc, hSn, Tsf =',
& iceFrac(i,j), iceHeight(i,j,bi,bj),
& snowHeight(i,j,bi,bj), Tsrf(i,j,bi,bj)
WRITE(6,1010) 'ThSI_FWD: ocTs,tFrzOce,frzmltMxL,Qnet=',
& tOceMxL(i,j,bi,bj), tFrzOce(i,j),
& frzmltMxL(i,j), Qnet(i,j,bi,bj)
ENDIF
IF (iceFrac(i,j).GT.0.)
& WRITE(6,1010) 'ThSI_FWD: icFrac,flxAtm,evpAtm,flxSnw=',
& iceFrac(i,j), icFlxAtm(i,j,bi,bj),
& icFrwAtm(i,j,bi,bj),-Lfresh*snowPrc(i,j,bi,bj)
ENDIF
#endif
ENDDO
ENDDO
#ifdef ALLOW_AUTODIFF_TAMC
CADJ STORE iceMask(:,:,bi,bj) = comlev1_bibj,key=ticekey,byte=isbyte
#endif
CALL THSICE_CALC_THICKN(
I bi, bj,
I iMin,iMax, jMin,jMax, dBugFlag,
I iceMask(siLo,sjLo,bi,bj), tFrzOce,
I tOceMxL(siLo,sjLo,bi,bj), v2ocMxL(siLo,sjLo,bi,bj),
I snowPrc(siLo,sjLo,bi,bj), prcAtm,
I sHeating(siLo,sjLo,bi,bj), flxCndBt(siLo,sjLo,bi,bj),
U iceFrac, iceHeight(siLo,sjLo,bi,bj),
U snowHeight(siLo,sjLo,bi,bj), Tsrf(siLo,sjLo,bi,bj),
U Qice1(siLo,sjLo,bi,bj), Qice2(siLo,sjLo,bi,bj),
U icFrwAtm(siLo,sjLo,bi,bj), frzmltMxL, flx2oc,
O frw2oc, fsalt,
I myTime, myIter, myThid )
#ifdef ALLOW_AUTODIFF_TAMC
CADJ STORE iceMask(:,:,bi,bj) = comlev1_bibj,key=ticekey,byte=isbyte
CADJ STORE fsalt(:,:) = comlev1_bibj,key=ticekey,byte=isbyte
CADJ STORE flx2oc(:,:) = comlev1_bibj,key=ticekey,byte=isbyte
CADJ STORE frw2oc(:,:) = comlev1_bibj,key=ticekey,byte=isbyte
#endif
C-- Net fluxes :
DO j = jMin, jMax
DO i = iMin, iMax
c#ifdef ALLOW_AUTODIFF_TAMC
c ikey_1 = i
c & + sNx*(j-1)
c & + sNx*sNy*act1
c & + sNx*sNy*max1*act2
c & + sNx*sNy*max1*max2*act3
c & + sNx*sNy*max1*max2*max3*act4
c#endif /* ALLOW_AUTODIFF_TAMC */
c#ifdef ALLOW_AUTODIFF_TAMC
cCADJ STORE icemask(i,j,bi,bj) = comlev1_thsice_1, key=ikey_1
c#endif
IF (iceMask(i,j,bi,bj).GT.0. _d 0) THEN
C- weighted average net fluxes:
c#ifdef ALLOW_AUTODIFF_TAMC
cCADJ STORE fsalt(i,j) = comlev1_thsice_1, key=ikey_1
cCADJ STORE flx2oc(i,j) = comlev1_thsice_1, key=ikey_1
cCADJ STORE frw2oc(i,j) = comlev1_thsice_1, key=ikey_1
cCADJ STORE icemask(i,j,bi,bj) = comlev1_thsice_1, key=ikey_1
c#endif
icFrac = iceMask(i,j,bi,bj)
opFrac= 1. _d 0-icFrac
#ifdef ALLOW_ATM2D
pass_qnet(i,j) = pass_qnet(i,j) - icFrac*flx2oc(i,j)
pass_evap(i,j) = pass_evap(i,j) - icFrac*frw2oc(i,j)/rhofw
sFluxFromIce(i,j) = -icFrac*fsalt(i,j)
#else
icFlxAtm(i,j,bi,bj) = icFrac*icFlxAtm(i,j,bi,bj)
& - opFrac*Qnet(i,j,bi,bj)
icFrwAtm(i,j,bi,bj) = icFrac*icFrwAtm(i,j,bi,bj)
& + opFrac*EmPmR(i,j,bi,bj)
Qnet(i,j,bi,bj) = -icFrac*flx2oc(i,j) + opFrac*Qnet(i,j,bi,bj)
EmPmR(i,j,bi,bj)= -icFrac*frw2oc(i,j)
& + opFrac*EmPmR(i,j,bi,bj)
saltFlux(i,j,bi,bj) = -icFrac*fsalt(i,j)
#endif
#ifdef ALLOW_DBUG_THSICE
IF (dBug(i,j,bi,bj)) WRITE(6,1010)
& 'ThSI_FWD:-3- iceFrac, hIc, hSn, Qnet =',
& iceFrac(i,j), iceHeight(i,j,bi,bj),
& snowHeight(i,j,bi,bj), Qnet(i,j,bi,bj)
#endif
ELSEIF (hOceMxL(i,j,bi,bj).GT.0. _d 0) THEN
icFlxAtm(i,j,bi,bj) = -Qnet(i,j,bi,bj)
icFrwAtm(i,j,bi,bj) = EmPmR(i,j,bi,bj)
ELSE
icFlxAtm(i,j,bi,bj) = 0. _d 0
icFrwAtm(i,j,bi,bj) = 0. _d 0
ENDIF
ENDDO
ENDDO
C---+----1----+----2----+----3----+----4----+----5----+----6----+----7-|--+----|
C part.3 : freezing of sea-water
C over ice-free fraction and what is left from ice-covered fraction
C-------
CALL THSICE_EXTEND(
I bi, bj,
I iMin,iMax, jMin,jMax, dBugFlag,
I frzmltMxL, tFrzOce,
I tOceMxL(siLo,sjLo,bi,bj),
U iceFrac, iceHeight(siLo,sjLo,bi,bj),
U snowHeight(siLo,sjLo,bi,bj), Tsrf(siLo,sjLo,bi,bj),
U Tice1(siLo,sjLo,bi,bj), Tice2(siLo,sjLo,bi,bj),
U Qice1(siLo,sjLo,bi,bj), Qice2(siLo,sjLo,bi,bj),
O flx2oc, frw2oc, fsalt,
I myTime, myIter, myThid )
#ifdef ALLOW_AUTODIFF_TAMC
CADJ STORE snowHeight(:,:,bi,bj) =
CADJ & comlev1_bibj,key=ticekey,byte=isbyte
#endif
DO j = jMin, jMax
DO i = iMin, iMax
IF (frzmltMxL(i,j).GT.0. _d 0) THEN
C-- Net fluxes :
#ifdef ALLOW_ATM2D
pass_qnet(i,j) = pass_qnet(i,j) - flx2oc(i,j)
pass_evap(i,j) = pass_evap(i,j) - frw2oc(i,j)/rhofw
sFluxFromIce(i,j)= sFluxFromIce(i,j) - fsalt(i,j)
#else
Qnet(i,j,bi,bj) = Qnet(i,j,bi,bj) - flx2oc(i,j)
EmPmR(i,j,bi,bj)= EmPmR(i,j,bi,bj)- frw2oc(i,j)
saltFlux(i,j,bi,bj)=saltFlux(i,j,bi,bj) - fsalt(i,j)
#endif
#ifdef ALLOW_DBUG_THSICE
IF (dBug(i,j,bi,bj)) WRITE(6,1010)
& 'ThSI_FWD:-4- iceFrac, hIc, hSn, Qnet =',
& iceFrac(i,j), iceHeight(i,j,bi,bj),
& snowHeight(i,j,bi,bj), Qnet(i,j,bi,bj)
#endif
ENDIF
IF ( hOceMxL(i,j,bi,bj).GT.0. _d 0 )
& isIceFree(i,j) = iceMask(i,j,bi,bj).LE.0. _d 0
& .AND. iceFrac(i,j) .LE.0. _d 0
IF ( iceFrac(i,j) .GT. 0. _d 0 ) THEN
iceMask(i,j,bi,bj)=iceFrac(i,j)
IF ( snowHeight(i,j,bi,bj).EQ.0. _d 0 )
& snowAge(i,j,bi,bj) = 0. _d 0
ELSE
iceMask(i,j,bi,bj) = 0. _d 0
iceHeight(i,j,bi,bj)= 0. _d 0
snowHeight(i,j,bi,bj)=0. _d 0
snowAge(i,j,bi,bj) = 0. _d 0
Tsrf(i,j,bi,bj) = tOceMxL(i,j,bi,bj)
Tice1(i,j,bi,bj) = 0. _d 0
Tice2(i,j,bi,bj) = 0. _d 0
Qice1(i,j,bi,bj) = Lfresh
Qice2(i,j,bi,bj) = Lfresh
ENDIF
ENDDO
ENDDO
# ifdef ALLOW_AUTODIFF_TAMC
CADJ STORE snowHeight(:,:,bi,bj) =
CADJ & comlev1_bibj,key=ticekey,byte=isbyte
# endif
DO j = jMin, jMax
DO i = iMin, iMax
C-- Compute Sea-Ice Loading (= mass of sea-ice + snow / area unit)
sIceLoad(i,j,bi,bj) = ( snowHeight(i,j,bi,bj)*rhos
& + iceHeight(i,j,bi,bj)*rhoi
& )*iceMask(i,j,bi,bj)
ENDDO
ENDDO
IF ( thSIceAdvScheme.GT.0 ) THEN
C-- note: those fluxes should to be added directly to Qnet, EmPmR & saltFlux
DO j = jMin, jMax
DO i = iMin, iMax
IF ( hOceMxL(i,j,bi,bj).GT.0. _d 0 ) THEN
Qnet(i,j,bi,bj) = Qnet(i,j,bi,bj) - oceQnet(i,j,bi,bj)
EmPmR(i,j,bi,bj)= EmPmR(i,j,bi,bj)- oceFWfx(i,j,bi,bj)
saltFlux(i,j,bi,bj)=saltFlux(i,j,bi,bj) - oceSflx(i,j,bi,bj)
ENDIF
ENDDO
ENDDO
ENDIF
#ifdef ALLOW_BULK_FORCE
IF ( useBulkForce ) THEN
CALL BULKF_FLUX_ADJUST(
I bi, bj, iMin, iMax, jMin, jMax,
I isIceFree, myTime, myIter, myThid )
ENDIF
#endif /* ALLOW_BULK_FORCE */
C---+----1----+----2----+----3----+----4----+----5----+----6----+----7-|--+----|
#endif /* ALLOW_THSICE */
RETURN
END