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jmc |
1.9 |
C $Header: /u/gcmpack/MITgcm/pkg/thsice/thsice_step_fwd.F,v 1.8 2004/10/19 02:42:04 jmc Exp $ |
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1.1 |
C $Name: $ |
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#include "THSICE_OPTIONS.h" |
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1.3 |
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CBOP |
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1.1 |
C !ROUTINE: THSICE_STEP_FWD |
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C !INTERFACE: |
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SUBROUTINE THSICE_STEP_FWD( |
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I bi, bj, iMin, iMax, jMin, jMax, |
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jmc |
1.3 |
I prcAtm, |
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U evpAtm, flxSW, |
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1.1 |
I myTime, myIter, myThid ) |
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1.3 |
C !DESCRIPTION: \bv |
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1.1 |
C *==========================================================* |
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1.3 |
C | S/R THSICE_STEP_FWD |
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1.1 |
C | o Step Forward Therm-SeaIce model. |
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C *==========================================================* |
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1.3 |
C \ev |
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1.1 |
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C !USES: |
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IMPLICIT NONE |
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1.3 |
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1.1 |
C === Global variables === |
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#include "SIZE.h" |
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#include "EEPARAMS.h" |
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#include "PARAMS.h" |
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#include "FFIELDS.h" |
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#include "THSICE_SIZE.h" |
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#include "THSICE_PARAMS.h" |
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1.3 |
#include "THSICE_VARS.h" |
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#include "THSICE_TAVE.h" |
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1.1 |
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C !INPUT/OUTPUT PARAMETERS: |
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C === Routine arguments === |
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1.3 |
C bi,bj :: tile indices |
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C iMin,iMax :: computation domain: 1rst index range |
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C jMin,jMax :: computation domain: 2nd index range |
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C- input: |
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C prcAtm :: total precip from the atmosphere [kg/m2/s] |
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C evpAtm :: (Inp) evaporation to the atmosphere [kg/m2/s] (>0 if evaporate) |
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C flxSW :: (Inp) short-wave heat flux (+=down): downward comp. only |
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C (part.1), becomes net SW flux into ocean (part.2). |
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C- output |
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C evpAtm :: (Out) net fresh-water flux (E-P) from the atmosphere [m/s] (+=up) |
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C flxSW :: (Out) net surf. heat flux from the atmosphere [W/m2], (+=down) |
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C myTime :: time counter for this thread |
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C myIter :: iteration counter for this thread |
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C myThid :: thread number for this instance of the routine. |
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1.1 |
INTEGER bi,bj |
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INTEGER iMin, iMax |
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INTEGER jMin, jMax |
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jmc |
1.3 |
_RL prcAtm(1-OLx:sNx+OLx,1-OLy:sNy+OLy) |
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_RL evpAtm(1-OLx:sNx+OLx,1-OLy:sNy+OLy) |
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_RL flxSW (1-OLx:sNx+OLx,1-OLy:sNy+OLy) |
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1.1 |
_RL myTime |
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INTEGER myIter |
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INTEGER myThid |
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1.3 |
CEOP |
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1.1 |
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#ifdef ALLOW_THSICE |
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C !LOCAL VARIABLES: |
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C === Local variables === |
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1.3 |
C snowPr :: snow precipitation [kg/m2/s] |
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C agingTime :: aging time scale (s) |
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C ageFac :: snow aging factor [1] |
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C albedo :: surface albedo [0-1] |
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C flxAtm :: net heat flux from the atmosphere (+=down) [W/m2] |
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C frwAtm :: net fresh-water flux (E-P) to the atmosphere [kg/m2/s] |
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C Fbot :: the oceanic heat flux already incorporated (ice_therm) |
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C flx2oc :: net heat flux from the ice to the ocean (+=down) [W/m2] |
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C frw2oc :: fresh-water flux from the ice to the ocean |
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C fsalt :: mass salt flux to the ocean |
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C frzmltMxL :: ocean mixed-layer freezing/melting potential [W/m2] |
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C TFrzOce :: sea-water freezing temperature [oC] (function of S) |
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jmc |
1.1 |
INTEGER i,j |
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jmc |
1.3 |
_RL snowPr |
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_RL agingTime, ageFac |
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jmc |
1.2 |
_RL albedo |
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1.3 |
_RL flxAtm(1-OLx:sNx+OLx,1-OLy:sNy+OLy) |
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_RL frwAtm |
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_RL flx2oc |
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_RL frw2oc |
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jmc |
1.1 |
_RL fsalt |
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jmc |
1.3 |
_RL TFrzOce, cphm, frzmltMxL |
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jmc |
1.1 |
_RL Fbot, esurp |
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jmc |
1.3 |
_RL opFrac, icFrac |
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_RL oceV2s, oceTs |
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jmc |
1.1 |
_RL compact, hIce, hSnow, Tsf, Tice(nlyr), qicen(nlyr) |
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jmc |
1.3 |
_RL tmpflx(0:2), tmpdTs |
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jmc |
1.9 |
#ifdef ALLOW_DIAGNOSTICS |
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_RL tmpFld(1-OLx:sNx+OLx,1-OLy:sNy+OLy) |
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LOGICAL DIAGNOSTICS_IS_ON |
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EXTERNAL DIAGNOSTICS_IS_ON |
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#endif |
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1.1 |
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LOGICAL dBug |
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1.4 |
1010 FORMAT(A,1P4E11.3) |
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1.1 |
dBug = .FALSE. |
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1.4 |
C- Initialise flxAtm |
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DO j = 1-Oly, sNy+Oly |
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DO i = 1-Olx, sNx+Olx |
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flxAtm(i,j) = 0. |
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ENDDO |
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ENDDO |
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jmc |
1.1 |
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1.8 |
IF ( fluidIsWater ) THEN |
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jmc |
1.3 |
DO j = jMin, jMax |
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DO i = iMin, iMax |
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jmc |
1.5 |
c dBug = ( bi.EQ.3 .AND. i.EQ.15 .AND. j.EQ.11 ) |
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jmc |
1.3 |
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C---+----1----+----2----+----3----+----4----+----5----+----6----+----7-|--+----| |
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C part.1 : ice-covered fraction ; |
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C Solve for surface and ice temperature (implicitly) ; compute surf. fluxes |
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C------- |
117 |
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IF (iceMask(i,j,bi,bj).GT.0. _d 0) THEN |
118 |
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icFrac = iceMask(i,j,bi,bj) |
119 |
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TFrzOce = -mu_Tf*sOceMxL(i,j,bi,bj) |
120 |
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hIce = iceHeight(i,j,bi,bj) |
121 |
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hSnow = snowHeight(i,j,bi,bj) |
122 |
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Tsf = Tsrf(i,j,bi,bj) |
123 |
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qicen(1)= Qice1(i,j,bi,bj) |
124 |
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qicen(2)= Qice2(i,j,bi,bj) |
125 |
jmc |
1.5 |
IF ( dBug ) THEN |
126 |
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WRITE(6,'(A,2I4,2I2)') 'ThSI_FWD: i,j=',i,j,bi,bj |
127 |
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WRITE(6,1010) 'ThSI_FWD:-0- iceMask, hIc, hSn, Tsf =', |
128 |
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& icFrac, hIce,hSnow,Tsf |
129 |
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ENDIF |
130 |
jmc |
1.3 |
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131 |
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CALL THSICE_ALBEDO( |
132 |
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I hIce, hSnow, Tsf, snowAge(i,j,bi,bj), |
133 |
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O albedo, |
134 |
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I myThid ) |
135 |
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flxSW(i,j) = flxSW(i,j)*(1. _d 0 - albedo) |
136 |
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137 |
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CALL THSICE_SOLVE4TEMP( |
138 |
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I useBulkforce, tmpflx, TFrzOce, hIce, hSnow, |
139 |
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U flxSW(i,j), Tsf, qicen, |
140 |
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O Tice, sHeating(i,j,bi,bj), flxCndBt(i,j,bi,bj), |
141 |
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O tmpdTs, flxAtm(i,j), evpAtm(i,j), |
142 |
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I i,j, bi,bj, myThid) |
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#ifdef SHORTWAVE_HEATING |
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C-- Update Fluxes : |
146 |
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opFrac= 1. _d 0-icFrac |
147 |
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Qsw(i,j,bi,bj)=-icFrac*flxSW(i,j) +opFrac*Qsw(i,j,bi,bj) |
148 |
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#endif |
149 |
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C-- Update Sea-Ice state : |
150 |
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Tsrf(i,j,bi,bj) =Tsf |
151 |
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Tice1(i,j,bi,bj)=Tice(1) |
152 |
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Tice2(i,j,bi,bj)=Tice(2) |
153 |
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Qice1(i,j,bi,bj)=qicen(1) |
154 |
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Qice2(i,j,bi,bj)=qicen(2) |
155 |
jmc |
1.9 |
siceAlb(i,j,bi,bj) = icFrac*albedo |
156 |
jmc |
1.5 |
IF ( dBug ) THEN |
157 |
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WRITE(6,1010) 'ThSI_FWD: Tsf, Tice(1,2), frzmltMxL =', |
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& Tsf, Tice, frzmltMxL |
159 |
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WRITE(6,1010) 'ThSI_FWD: sHeat,fxCndBt, fxAtm,evAtm=', |
160 |
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& sHeating(i,j,bi,bj), flxCndBt(i,j,bi,bj), |
161 |
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& flxAtm(i,j), evpAtm(i,j) |
162 |
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ENDIF |
163 |
jmc |
1.3 |
ENDIF |
164 |
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ENDDO |
165 |
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ENDDO |
166 |
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ENDIF |
167 |
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dBug = .FALSE. |
168 |
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jmc |
1.9 |
#ifdef ALLOW_DIAGNOSTICS |
170 |
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IF ( useDiagnostics ) THEN |
171 |
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172 |
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IF ( DIAGNOSTICS_IS_ON('SIsnwPrc',myThid) ) THEN |
173 |
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DO j=1,sNy |
174 |
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DO i=1,sNx |
175 |
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tmpFld(i,j) = iceMask(i,j,bi,bj)*snowPrc(i,j,bi,bj) |
176 |
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ENDDO |
177 |
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ENDDO |
178 |
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CALL DIAGNOSTICS_FILL(tmpFld,'SIsnwPrc',0,1,2,bi,bj,myThid) |
179 |
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ENDIF |
180 |
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181 |
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ENDIF |
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#endif /* ALLOW_DIAGNOSTICS */ |
183 |
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jmc |
1.3 |
C---+----1----+----2----+----3----+----4----+----5----+----6----+----7-|--+----| |
185 |
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C part.2 : ice-covered fraction ; |
186 |
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C change in ice/snow thickness and ice-fraction |
187 |
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C note: can only reduce the ice-fraction but not increase it. |
188 |
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C------- |
189 |
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agingTime = 50. _d 0 * 86400. _d 0 |
190 |
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ageFac = 1. _d 0 - thSIce_deltaT/agingTime |
191 |
jmc |
1.1 |
DO j = jMin, jMax |
192 |
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DO i = iMin, iMax |
193 |
jmc |
1.5 |
c dBug = ( bi.EQ.3 .AND. i.EQ.15 .AND. j.EQ.11 ) |
194 |
jmc |
1.3 |
|
195 |
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TFrzOce = -mu_Tf*sOceMxL(i,j,bi,bj) |
196 |
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oceTs = tOceMxL(i,j,bi,bj) |
197 |
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cphm = cpwater*rhosw*hOceMxL(i,j,bi,bj) |
198 |
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frzmltMxL = (TFrzOce-oceTs)*cphm/ocean_deltaT |
199 |
jmc |
1.1 |
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200 |
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Fbot = 0. _d 0 |
201 |
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saltFlux(i,j,bi,bj) = 0. _d 0 |
202 |
jmc |
1.3 |
compact= iceMask(i,j,bi,bj) |
203 |
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C------- |
204 |
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IF (dBug .AND. (frzmltMxL.GT.0. .OR. compact.GT.0.) ) THEN |
205 |
jmc |
1.5 |
WRITE(6,'(A,2I4,2I2)') 'ThSI_FWD: i,j=',i,j,bi,bj |
206 |
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WRITE(6,1010) 'ThSI_FWD:-1- iceMask, hIc, hSn, Tsf =', |
207 |
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& compact, iceHeight(i,j,bi,bj), |
208 |
jmc |
1.7 |
& snowHeight(i,j,bi,bj), Tsrf(i,j,bi,bj) |
209 |
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WRITE(6,1010) 'ThSI_FWD: ocTs,TFrzOce,frzmltMxL,Qnet=', |
210 |
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& oceTs, TFrzOce, frzmltMxL,Qnet(i,j,bi,bj) |
211 |
jmc |
1.1 |
ENDIF |
212 |
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C------- |
213 |
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IF (iceMask(i,j,bi,bj).GT.0. _d 0) THEN |
214 |
jmc |
1.3 |
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215 |
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oceV2s = v2ocMxL(i,j,bi,bj) |
216 |
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snowPr = snowPrc(i,j,bi,bj) |
217 |
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hIce = iceHeight(i,j,bi,bj) |
218 |
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hSnow = snowHeight(i,j,bi,bj) |
219 |
jmc |
1.1 |
Tsf = Tsrf(i,j,bi,bj) |
220 |
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qicen(1)= Qice1(i,j,bi,bj) |
221 |
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qicen(2)= Qice2(i,j,bi,bj) |
222 |
jmc |
1.3 |
flx2oc = flxSW(i,j) |
223 |
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224 |
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CALL THSICE_CALC_THICKN( |
225 |
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I frzmltMxL, TFrzOce, oceTs, oceV2s, snowPr, |
226 |
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I sHeating(i,j,bi,bj), flxCndBt(i,j,bi,bj), evpAtm(i,j), |
227 |
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U compact, hIce, hSnow, Tsf, qicen, flx2oc, |
228 |
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O frw2oc, fsalt, Fbot, |
229 |
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I dBug, myThid) |
230 |
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231 |
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C- note : snowPr was not supposed to be modified in THSICE_THERM ; |
232 |
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C but to reproduce old results, is reset to zero if Tsf >= 0 |
233 |
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snowPrc(i,j,bi,bj) = snowPr |
234 |
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235 |
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C-- Snow aging : |
236 |
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snowAge(i,j,bi,bj) = thSIce_deltaT |
237 |
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& + snowAge(i,j,bi,bj)*ageFac |
238 |
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IF ( snowPr.GT.0. _d 0 ) |
239 |
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& snowAge(i,j,bi,bj) = snowAge(i,j,bi,bj) |
240 |
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& * EXP( -(thSIce_deltaT*snowPr/rhos)/hNewSnowAge ) |
241 |
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C-- |
242 |
jmc |
1.1 |
|
243 |
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C-- Diagnostic of Atmospheric Fluxes over sea-ice : |
244 |
jmc |
1.3 |
frwAtm = evpAtm(i,j) - prcAtm(i,j) |
245 |
jmc |
1.1 |
C note: Any flux of mass (here fresh water) that enter or leave the system |
246 |
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C with a non zero energy HAS TO be counted: add snow precip. |
247 |
jmc |
1.3 |
flxAtm(i,j) = flxAtm(i,j) - Lfresh*snowPrc(i,j,bi,bj) |
248 |
jmc |
1.1 |
|
249 |
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C---+----1----+----2----+----3----+----4----+----5----+----6----+----7-|--+----| |
250 |
jmc |
1.3 |
IF (dBug) WRITE(6,1010) 'ThSI_FWD: icFrac,flxAtm,evpAtm,flxSnw=', |
251 |
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& iceMask(i,j,bi,bj),flxAtm(i,j),evpAtm(i,j),-Lfresh*snowPr |
252 |
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IF (dBug) WRITE(6,1010) 'ThSI_FWD: compact,flx2oc,fsalt,frw2oc=', |
253 |
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& compact,flx2oc,fsalt,frw2oc |
254 |
jmc |
1.1 |
#ifdef CHECK_ENERGY_CONSERV |
255 |
jmc |
1.3 |
icFrac = iceMask(i,j,bi,bj) |
256 |
jmc |
1.1 |
CALL THSICE_CHECK_CONSERV( dBug, i, j, bi, bj, 0, |
257 |
jmc |
1.3 |
I icFrac, compact, hIce, hSnow, qicen, |
258 |
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I flx2oc, frw2oc, fsalt, flxAtm(i,j), frwAtm, |
259 |
jmc |
1.1 |
I myTime, myIter, myThid ) |
260 |
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#endif /* CHECK_ENERGY_CONSERV */ |
261 |
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C---+----1----+----2----+----3----+----4----+----5----+----6----+----7-|--+----| |
262 |
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263 |
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C-- Update Sea-Ice state : |
264 |
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c iceMask(i,j,bi,bj)=compact |
265 |
jmc |
1.5 |
iceHeight(i,j,bi,bj) = hIce |
266 |
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snowHeight(i,j,bi,bj)= hSnow |
267 |
jmc |
1.1 |
Tsrf(i,j,bi,bj) =Tsf |
268 |
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Qice1(i,j,bi,bj)=qicen(1) |
269 |
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Qice2(i,j,bi,bj)=qicen(2) |
270 |
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271 |
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C-- Net fluxes : |
272 |
jmc |
1.3 |
frw2oc = frw2oc + (prcAtm(i,j)-snowPrc(i,j,bi,bj)) |
273 |
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C- weighted average net fluxes: |
274 |
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icFrac = iceMask(i,j,bi,bj) |
275 |
|
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opFrac= 1. _d 0-icFrac |
276 |
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flxAtm(i,j) = icFrac*flxAtm(i,j) - opFrac*Qnet(i,j,bi,bj) |
277 |
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frwAtm = icFrac*frwAtm + opFrac*rhofw*EmPmR(i,j,bi,bj) |
278 |
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Qnet(i,j,bi,bj)=-icFrac*flx2oc +opFrac*Qnet(i,j,bi,bj) |
279 |
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EmPmR(i,j,bi,bj)=-icFrac*frw2oc/rhofw+opFrac*EmPmR(i,j,bi,bj) |
280 |
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saltFlux(i,j,bi,bj)=-icFrac*fsalt |
281 |
jmc |
1.1 |
|
282 |
jmc |
1.5 |
IF (dBug) WRITE(6,1010) |
283 |
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& 'ThSI_FWD:-3- compact, hIc, hSn, Qnet =', |
284 |
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& compact,hIce,hSnow,Qnet(i,j,bi,bj) |
285 |
jmc |
1.1 |
|
286 |
jmc |
1.3 |
ELSEIF (hOceMxL(i,j,bi,bj).gt.0. _d 0) THEN |
287 |
|
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flxAtm(i,j) = -Qnet(i,j,bi,bj) |
288 |
|
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frwAtm = rhofw*EmPmR(i,j,bi,bj) |
289 |
|
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ELSE |
290 |
|
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flxAtm(i,j) = 0. _d 0 |
291 |
|
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frwAtm = 0. _d 0 |
292 |
jmc |
1.1 |
ENDIF |
293 |
|
|
|
294 |
|
|
C---+----1----+----2----+----3----+----4----+----5----+----6----+----7-|--+----| |
295 |
jmc |
1.3 |
C part.3 : freezing of sea-water |
296 |
jmc |
1.1 |
C over ice-free fraction and what is left from ice-covered fraction |
297 |
|
|
C------- |
298 |
jmc |
1.3 |
c compact= iceMask(i,j,bi,bj) |
299 |
|
|
hIce = iceHeight(i,j,bi,bj) |
300 |
|
|
hSnow = snowHeight(i,j,bi,bj) |
301 |
|
|
|
302 |
|
|
esurp = frzmltMxL - Fbot*iceMask(i,j,bi,bj) |
303 |
jmc |
1.1 |
IF (esurp.GT.0. _d 0) THEN |
304 |
jmc |
1.3 |
icFrac = compact |
305 |
|
|
qicen(1)= Qice1(i,j,bi,bj) |
306 |
|
|
qicen(2)= Qice2(i,j,bi,bj) |
307 |
|
|
CALL THSICE_EXTEND( |
308 |
|
|
I esurp, TFrzOce, |
309 |
|
|
U oceTs, compact, hIce, hSnow, qicen, |
310 |
|
|
O flx2oc, frw2oc, fsalt, |
311 |
|
|
I dBug, myThid ) |
312 |
jmc |
1.1 |
C---+----1----+----2----+----3----+----4----+----5----+----6----+----7-|--+----| |
313 |
jmc |
1.3 |
IF (dBug) WRITE(6,1010) 'ThSI_FWD: compact,flx2oc,fsalt,frw2oc=' |
314 |
|
|
& ,compact,flx2oc,fsalt,frw2oc |
315 |
jmc |
1.1 |
#ifdef CHECK_ENERGY_CONSERV |
316 |
jmc |
1.3 |
tmpflx(1) = 0. |
317 |
|
|
tmpflx(2) = 0. |
318 |
jmc |
1.1 |
CALL THSICE_CHECK_CONSERV( dBug, i, j, bi, bj, 1, |
319 |
jmc |
1.3 |
I icFrac, compact, hIce, hSnow, qicen, |
320 |
|
|
I flx2oc, frw2oc, fsalt, tmpflx(1), tmpflx(2), |
321 |
jmc |
1.1 |
I myTime, myIter, myThid ) |
322 |
|
|
#endif /* CHECK_ENERGY_CONSERV */ |
323 |
|
|
C---+----1----+----2----+----3----+----4----+----5----+----6----+----7-|--+----| |
324 |
|
|
C-- Update Sea-Ice state : |
325 |
jmc |
1.3 |
IF ( compact.GT.0. _d 0 .AND. icFrac.EQ.0. _d 0) THEN |
326 |
|
|
Tsrf(i,j,bi,bj) = TFrzOce |
327 |
|
|
Tice1(i,j,bi,bj) = TFrzOce |
328 |
|
|
Tice2(i,j,bi,bj) = TFrzOce |
329 |
jmc |
1.1 |
Qice1(i,j,bi,bj) = qicen(1) |
330 |
|
|
Qice2(i,j,bi,bj) = qicen(2) |
331 |
|
|
ENDIF |
332 |
jmc |
1.5 |
iceHeight(i,j,bi,bj) = hIce |
333 |
|
|
snowHeight(i,j,bi,bj)= hSnow |
334 |
jmc |
1.1 |
C-- Net fluxes : |
335 |
jmc |
1.3 |
Qnet(i,j,bi,bj) = Qnet(i,j,bi,bj) - flx2oc |
336 |
|
|
EmPmR(i,j,bi,bj)= EmPmR(i,j,bi,bj)- frw2oc/rhofw |
337 |
jmc |
1.1 |
saltFlux(i,j,bi,bj)=saltFlux(i,j,bi,bj) - fsalt |
338 |
|
|
|
339 |
jmc |
1.5 |
IF (dBug) WRITE(6,1010) |
340 |
|
|
& 'ThSI_FWD:-4- compact, hIc, hSn, Qnet =', |
341 |
jmc |
1.1 |
& compact,hIce,hSnow,Qnet(i,j,bi,bj) |
342 |
|
|
C-- - if esurp > 0 : end |
343 |
|
|
ENDIF |
344 |
|
|
|
345 |
|
|
IF ( compact .GT. 0. _d 0 ) THEN |
346 |
|
|
iceMask(i,j,bi,bj)=compact |
347 |
jmc |
1.3 |
IF ( hSnow .EQ. 0. _d 0 ) snowAge(i,j,bi,bj) = 0. _d 0 |
348 |
jmc |
1.1 |
ELSE |
349 |
|
|
iceMask(i,j,bi,bj) = 0. _d 0 |
350 |
|
|
iceHeight(i,j,bi,bj)= 0. _d 0 |
351 |
|
|
snowHeight(i,j,bi,bj)=0. _d 0 |
352 |
jmc |
1.3 |
snowAge(i,j,bi,bj) = 0. _d 0 |
353 |
jmc |
1.2 |
Tsrf(i,j,bi,bj) = oceTs |
354 |
jmc |
1.1 |
Tice1(i,j,bi,bj) = 0. _d 0 |
355 |
|
|
Tice2(i,j,bi,bj) = 0. _d 0 |
356 |
|
|
Qice1(i,j,bi,bj) = 0. _d 0 |
357 |
|
|
Qice2(i,j,bi,bj) = 0. _d 0 |
358 |
|
|
ENDIF |
359 |
|
|
|
360 |
jmc |
1.3 |
C-- Return atmospheric fluxes in evpAtm & flxSW (same sign and units): |
361 |
|
|
evpAtm(i,j) = frwAtm |
362 |
|
|
flxSW (i,j) = flxAtm(i,j) |
363 |
jmc |
1.6 |
|
364 |
|
|
#ifdef ATMOSPHERIC_LOADING |
365 |
|
|
C-- Compute Sea-Ice Loading (= mass of sea-ice + snow / area unit) |
366 |
|
|
sIceLoad(i,j,bi,bj) = ( snowHeight(i,j,bi,bj)*rhos |
367 |
|
|
& + iceHeight(i,j,bi,bj)*rhoi |
368 |
|
|
& )*iceMask(i,j,bi,bj) |
369 |
|
|
#endif |
370 |
|
|
|
371 |
jmc |
1.1 |
ENDDO |
372 |
|
|
ENDDO |
373 |
|
|
|
374 |
|
|
C---+----1----+----2----+----3----+----4----+----5----+----6----+----7-|--+----| |
375 |
|
|
#endif /* ALLOW_THSICE */ |
376 |
|
|
|
377 |
|
|
RETURN |
378 |
|
|
END |