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jmc |
1.4 |
C $Header: /u/gcmpack/MITgcm/pkg/thsice/thsice_step_fwd.F,v 1.3 2004/04/07 23:40:34 jmc Exp $ |
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jmc |
1.1 |
C $Name: $ |
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#include "THSICE_OPTIONS.h" |
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jmc |
1.3 |
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CBOP |
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jmc |
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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jmc |
1.1 |
I myTime, myIter, myThid ) |
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jmc |
1.3 |
C !DESCRIPTION: \bv |
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jmc |
1.1 |
C *==========================================================* |
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jmc |
1.3 |
C | S/R THSICE_STEP_FWD |
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jmc |
1.1 |
C | o Step Forward Therm-SeaIce model. |
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C *==========================================================* |
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jmc |
1.3 |
C \ev |
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jmc |
1.1 |
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C !USES: |
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IMPLICIT NONE |
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1.3 |
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jmc |
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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jmc |
1.3 |
#include "THSICE_VARS.h" |
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#include "THSICE_TAVE.h" |
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jmc |
1.1 |
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C !INPUT/OUTPUT PARAMETERS: |
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C === Routine arguments === |
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jmc |
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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jmc |
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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jmc |
1.1 |
_RL myTime |
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INTEGER myIter |
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INTEGER myThid |
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jmc |
1.3 |
CEOP |
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jmc |
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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jmc |
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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jmc |
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 |
1.1 |
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LOGICAL dBug |
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jmc |
1.4 |
1010 FORMAT(A,1P4E11.3) |
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jmc |
1.1 |
dBug = .FALSE. |
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jmc |
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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jmc |
1.3 |
IF ( buoyancyRelation(1:7) .EQ. 'OCEANIC' ) THEN |
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DO j = jMin, jMax |
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DO i = iMin, iMax |
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c dBug = ( bi.EQ.3 .AND. i.EQ.15 .AND. j.EQ.15 ) |
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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------- |
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IF (iceMask(i,j,bi,bj).GT.0. _d 0) THEN |
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icFrac = iceMask(i,j,bi,bj) |
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TFrzOce = -mu_Tf*sOceMxL(i,j,bi,bj) |
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hIce = iceHeight(i,j,bi,bj) |
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hSnow = snowHeight(i,j,bi,bj) |
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Tsf = Tsrf(i,j,bi,bj) |
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qicen(1)= Qice1(i,j,bi,bj) |
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qicen(2)= Qice2(i,j,bi,bj) |
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| 121 |
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CALL THSICE_ALBEDO( |
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I hIce, hSnow, Tsf, snowAge(i,j,bi,bj), |
| 123 |
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O albedo, |
| 124 |
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I myThid ) |
| 125 |
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flxSW(i,j) = flxSW(i,j)*(1. _d 0 - albedo) |
| 126 |
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| 127 |
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CALL THSICE_SOLVE4TEMP( |
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I useBulkforce, tmpflx, TFrzOce, hIce, hSnow, |
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U flxSW(i,j), Tsf, qicen, |
| 130 |
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O Tice, sHeating(i,j,bi,bj), flxCndBt(i,j,bi,bj), |
| 131 |
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O tmpdTs, flxAtm(i,j), evpAtm(i,j), |
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I i,j, bi,bj, myThid) |
| 133 |
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| 134 |
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#ifdef SHORTWAVE_HEATING |
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C-- Update Fluxes : |
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opFrac= 1. _d 0-icFrac |
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Qsw(i,j,bi,bj)=-icFrac*flxSW(i,j) +opFrac*Qsw(i,j,bi,bj) |
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#endif |
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C-- Update Sea-Ice state : |
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Tsrf(i,j,bi,bj) =Tsf |
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Tice1(i,j,bi,bj)=Tice(1) |
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Tice2(i,j,bi,bj)=Tice(2) |
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Qice1(i,j,bi,bj)=qicen(1) |
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Qice2(i,j,bi,bj)=qicen(2) |
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#ifdef ALLOW_TIMEAVE |
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ice_albedo_Ave(i,j,bi,bj) = ice_albedo_Ave(i,j,bi,bj) |
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& + icFrac*albedo*thSIce_deltaT |
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#endif /*ALLOW_TIMEAVE*/ |
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ENDIF |
| 150 |
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ENDDO |
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ENDDO |
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ENDIF |
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dBug = .FALSE. |
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C---+----1----+----2----+----3----+----4----+----5----+----6----+----7-|--+----| |
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C part.2 : ice-covered fraction ; |
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C change in ice/snow thickness and ice-fraction |
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C note: can only reduce the ice-fraction but not increase it. |
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C------- |
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agingTime = 50. _d 0 * 86400. _d 0 |
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ageFac = 1. _d 0 - thSIce_deltaT/agingTime |
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jmc |
1.1 |
DO j = jMin, jMax |
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DO i = iMin, iMax |
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jmc |
1.3 |
c dBug = ( bi.EQ.3 .AND. i.EQ.15 .AND. j.EQ.15 ) |
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TFrzOce = -mu_Tf*sOceMxL(i,j,bi,bj) |
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oceTs = tOceMxL(i,j,bi,bj) |
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cphm = cpwater*rhosw*hOceMxL(i,j,bi,bj) |
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frzmltMxL = (TFrzOce-oceTs)*cphm/ocean_deltaT |
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jmc |
1.1 |
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Fbot = 0. _d 0 |
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saltFlux(i,j,bi,bj) = 0. _d 0 |
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jmc |
1.3 |
compact= iceMask(i,j,bi,bj) |
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C------- |
| 175 |
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IF (dBug .AND. (frzmltMxL.GT.0. .OR. compact.GT.0.) ) THEN |
| 176 |
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WRITE(6,1010) 'ThSI_FWD:-1- iceMask,hIc,hSn,Qnet=', |
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jmc |
1.2 |
& compact, hIce, hSnow, Qnet(i,j,bi,bj) |
| 178 |
jmc |
1.3 |
WRITE(6,1010) 'ThSI_FWD: ocTs,TFrzOce,frzmltMxL=', |
| 179 |
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& oceTs,TFrzOce,frzmltMxL |
| 180 |
jmc |
1.1 |
ENDIF |
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C------- |
| 182 |
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IF (iceMask(i,j,bi,bj).GT.0. _d 0) THEN |
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jmc |
1.3 |
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| 184 |
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oceV2s = v2ocMxL(i,j,bi,bj) |
| 185 |
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snowPr = snowPrc(i,j,bi,bj) |
| 186 |
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hIce = iceHeight(i,j,bi,bj) |
| 187 |
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hSnow = snowHeight(i,j,bi,bj) |
| 188 |
jmc |
1.1 |
Tsf = Tsrf(i,j,bi,bj) |
| 189 |
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qicen(1)= Qice1(i,j,bi,bj) |
| 190 |
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qicen(2)= Qice2(i,j,bi,bj) |
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jmc |
1.3 |
flx2oc = flxSW(i,j) |
| 192 |
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| 193 |
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CALL THSICE_CALC_THICKN( |
| 194 |
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I frzmltMxL, TFrzOce, oceTs, oceV2s, snowPr, |
| 195 |
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I sHeating(i,j,bi,bj), flxCndBt(i,j,bi,bj), evpAtm(i,j), |
| 196 |
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U compact, hIce, hSnow, Tsf, qicen, flx2oc, |
| 197 |
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O frw2oc, fsalt, Fbot, |
| 198 |
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I dBug, myThid) |
| 199 |
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| 200 |
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C- note : snowPr was not supposed to be modified in THSICE_THERM ; |
| 201 |
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C but to reproduce old results, is reset to zero if Tsf >= 0 |
| 202 |
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snowPrc(i,j,bi,bj) = snowPr |
| 203 |
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| 204 |
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C-- Snow aging : |
| 205 |
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snowAge(i,j,bi,bj) = thSIce_deltaT |
| 206 |
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& + snowAge(i,j,bi,bj)*ageFac |
| 207 |
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IF ( snowPr.GT.0. _d 0 ) |
| 208 |
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& snowAge(i,j,bi,bj) = snowAge(i,j,bi,bj) |
| 209 |
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& * EXP( -(thSIce_deltaT*snowPr/rhos)/hNewSnowAge ) |
| 210 |
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C-- |
| 211 |
jmc |
1.1 |
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| 212 |
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C-- Diagnostic of Atmospheric Fluxes over sea-ice : |
| 213 |
jmc |
1.3 |
frwAtm = evpAtm(i,j) - prcAtm(i,j) |
| 214 |
jmc |
1.1 |
C note: Any flux of mass (here fresh water) that enter or leave the system |
| 215 |
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C with a non zero energy HAS TO be counted: add snow precip. |
| 216 |
jmc |
1.3 |
flxAtm(i,j) = flxAtm(i,j) - Lfresh*snowPrc(i,j,bi,bj) |
| 217 |
jmc |
1.1 |
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| 218 |
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C---+----1----+----2----+----3----+----4----+----5----+----6----+----7-|--+----| |
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jmc |
1.3 |
IF (dBug) WRITE(6,1010) 'ThSI_FWD: icFrac,flxAtm,evpAtm,flxSnw=', |
| 220 |
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& iceMask(i,j,bi,bj),flxAtm(i,j),evpAtm(i,j),-Lfresh*snowPr |
| 221 |
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IF (dBug) WRITE(6,1010) 'ThSI_FWD: compact,flx2oc,fsalt,frw2oc=', |
| 222 |
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& compact,flx2oc,fsalt,frw2oc |
| 223 |
jmc |
1.1 |
#ifdef CHECK_ENERGY_CONSERV |
| 224 |
jmc |
1.3 |
icFrac = iceMask(i,j,bi,bj) |
| 225 |
jmc |
1.1 |
CALL THSICE_CHECK_CONSERV( dBug, i, j, bi, bj, 0, |
| 226 |
jmc |
1.3 |
I icFrac, compact, hIce, hSnow, qicen, |
| 227 |
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I flx2oc, frw2oc, fsalt, flxAtm(i,j), frwAtm, |
| 228 |
jmc |
1.1 |
I myTime, myIter, myThid ) |
| 229 |
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#endif /* CHECK_ENERGY_CONSERV */ |
| 230 |
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C---+----1----+----2----+----3----+----4----+----5----+----6----+----7-|--+----| |
| 231 |
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| 232 |
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C-- Update Sea-Ice state : |
| 233 |
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c iceMask(i,j,bi,bj)=compact |
| 234 |
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iceheight(i,j,bi,bj) = hIce |
| 235 |
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snowheight(i,j,bi,bj)= hSnow |
| 236 |
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Tsrf(i,j,bi,bj) =Tsf |
| 237 |
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Qice1(i,j,bi,bj)=qicen(1) |
| 238 |
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Qice2(i,j,bi,bj)=qicen(2) |
| 239 |
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| 240 |
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C-- Net fluxes : |
| 241 |
jmc |
1.3 |
frw2oc = frw2oc + (prcAtm(i,j)-snowPrc(i,j,bi,bj)) |
| 242 |
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C- weighted average net fluxes: |
| 243 |
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icFrac = iceMask(i,j,bi,bj) |
| 244 |
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opFrac= 1. _d 0-icFrac |
| 245 |
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flxAtm(i,j) = icFrac*flxAtm(i,j) - opFrac*Qnet(i,j,bi,bj) |
| 246 |
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frwAtm = icFrac*frwAtm + opFrac*rhofw*EmPmR(i,j,bi,bj) |
| 247 |
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Qnet(i,j,bi,bj)=-icFrac*flx2oc +opFrac*Qnet(i,j,bi,bj) |
| 248 |
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EmPmR(i,j,bi,bj)=-icFrac*frw2oc/rhofw+opFrac*EmPmR(i,j,bi,bj) |
| 249 |
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saltFlux(i,j,bi,bj)=-icFrac*fsalt |
| 250 |
jmc |
1.1 |
|
| 251 |
jmc |
1.3 |
IF (dBug) WRITE(6,1010)'ThSI_FWD:-3- compact,hIc,hSn,Qnet=', |
| 252 |
jmc |
1.1 |
& compact,hIce,hSnow,Qnet(i,j,bi,bj) |
| 253 |
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| 254 |
jmc |
1.3 |
ELSEIF (hOceMxL(i,j,bi,bj).gt.0. _d 0) THEN |
| 255 |
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flxAtm(i,j) = -Qnet(i,j,bi,bj) |
| 256 |
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frwAtm = rhofw*EmPmR(i,j,bi,bj) |
| 257 |
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ELSE |
| 258 |
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flxAtm(i,j) = 0. _d 0 |
| 259 |
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frwAtm = 0. _d 0 |
| 260 |
jmc |
1.1 |
ENDIF |
| 261 |
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| 262 |
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C---+----1----+----2----+----3----+----4----+----5----+----6----+----7-|--+----| |
| 263 |
jmc |
1.3 |
C part.3 : freezing of sea-water |
| 264 |
jmc |
1.1 |
C over ice-free fraction and what is left from ice-covered fraction |
| 265 |
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C------- |
| 266 |
jmc |
1.3 |
c compact= iceMask(i,j,bi,bj) |
| 267 |
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hIce = iceHeight(i,j,bi,bj) |
| 268 |
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hSnow = snowHeight(i,j,bi,bj) |
| 269 |
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| 270 |
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esurp = frzmltMxL - Fbot*iceMask(i,j,bi,bj) |
| 271 |
jmc |
1.1 |
IF (esurp.GT.0. _d 0) THEN |
| 272 |
jmc |
1.3 |
icFrac = compact |
| 273 |
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qicen(1)= Qice1(i,j,bi,bj) |
| 274 |
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qicen(2)= Qice2(i,j,bi,bj) |
| 275 |
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CALL THSICE_EXTEND( |
| 276 |
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I esurp, TFrzOce, |
| 277 |
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U oceTs, compact, hIce, hSnow, qicen, |
| 278 |
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O flx2oc, frw2oc, fsalt, |
| 279 |
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I dBug, myThid ) |
| 280 |
jmc |
1.1 |
C---+----1----+----2----+----3----+----4----+----5----+----6----+----7-|--+----| |
| 281 |
jmc |
1.3 |
IF (dBug) WRITE(6,1010) 'ThSI_FWD: compact,flx2oc,fsalt,frw2oc=' |
| 282 |
|
|
& ,compact,flx2oc,fsalt,frw2oc |
| 283 |
jmc |
1.1 |
#ifdef CHECK_ENERGY_CONSERV |
| 284 |
jmc |
1.3 |
tmpflx(1) = 0. |
| 285 |
|
|
tmpflx(2) = 0. |
| 286 |
jmc |
1.1 |
CALL THSICE_CHECK_CONSERV( dBug, i, j, bi, bj, 1, |
| 287 |
jmc |
1.3 |
I icFrac, compact, hIce, hSnow, qicen, |
| 288 |
|
|
I flx2oc, frw2oc, fsalt, tmpflx(1), tmpflx(2), |
| 289 |
jmc |
1.1 |
I myTime, myIter, myThid ) |
| 290 |
|
|
#endif /* CHECK_ENERGY_CONSERV */ |
| 291 |
|
|
C---+----1----+----2----+----3----+----4----+----5----+----6----+----7-|--+----| |
| 292 |
|
|
C-- Update Sea-Ice state : |
| 293 |
jmc |
1.3 |
IF ( compact.GT.0. _d 0 .AND. icFrac.EQ.0. _d 0) THEN |
| 294 |
|
|
Tsrf(i,j,bi,bj) = TFrzOce |
| 295 |
|
|
Tice1(i,j,bi,bj) = TFrzOce |
| 296 |
|
|
Tice2(i,j,bi,bj) = TFrzOce |
| 297 |
jmc |
1.1 |
Qice1(i,j,bi,bj) = qicen(1) |
| 298 |
|
|
Qice2(i,j,bi,bj) = qicen(2) |
| 299 |
|
|
ENDIF |
| 300 |
|
|
iceheight(i,j,bi,bj) = hIce |
| 301 |
|
|
snowheight(i,j,bi,bj)= hSnow |
| 302 |
|
|
C-- Net fluxes : |
| 303 |
jmc |
1.3 |
Qnet(i,j,bi,bj) = Qnet(i,j,bi,bj) - flx2oc |
| 304 |
|
|
EmPmR(i,j,bi,bj)= EmPmR(i,j,bi,bj)- frw2oc/rhofw |
| 305 |
jmc |
1.1 |
saltFlux(i,j,bi,bj)=saltFlux(i,j,bi,bj) - fsalt |
| 306 |
|
|
|
| 307 |
jmc |
1.3 |
IF (dBug) WRITE(6,1010)'ThSI_FWD:-4- compact,hIc,hSn,Qnet=', |
| 308 |
jmc |
1.1 |
& compact,hIce,hSnow,Qnet(i,j,bi,bj) |
| 309 |
|
|
C-- - if esurp > 0 : end |
| 310 |
|
|
ENDIF |
| 311 |
|
|
|
| 312 |
|
|
IF ( compact .GT. 0. _d 0 ) THEN |
| 313 |
|
|
iceMask(i,j,bi,bj)=compact |
| 314 |
jmc |
1.3 |
IF ( hSnow .EQ. 0. _d 0 ) snowAge(i,j,bi,bj) = 0. _d 0 |
| 315 |
jmc |
1.1 |
ELSE |
| 316 |
|
|
iceMask(i,j,bi,bj) = 0. _d 0 |
| 317 |
|
|
iceHeight(i,j,bi,bj)= 0. _d 0 |
| 318 |
|
|
snowHeight(i,j,bi,bj)=0. _d 0 |
| 319 |
jmc |
1.3 |
snowAge(i,j,bi,bj) = 0. _d 0 |
| 320 |
jmc |
1.2 |
Tsrf(i,j,bi,bj) = oceTs |
| 321 |
jmc |
1.1 |
Tice1(i,j,bi,bj) = 0. _d 0 |
| 322 |
|
|
Tice2(i,j,bi,bj) = 0. _d 0 |
| 323 |
|
|
Qice1(i,j,bi,bj) = 0. _d 0 |
| 324 |
|
|
Qice2(i,j,bi,bj) = 0. _d 0 |
| 325 |
|
|
ENDIF |
| 326 |
|
|
|
| 327 |
jmc |
1.3 |
C-- Return atmospheric fluxes in evpAtm & flxSW (same sign and units): |
| 328 |
|
|
evpAtm(i,j) = frwAtm |
| 329 |
|
|
flxSW (i,j) = flxAtm(i,j) |
| 330 |
jmc |
1.1 |
ENDDO |
| 331 |
|
|
ENDDO |
| 332 |
|
|
|
| 333 |
|
|
C---+----1----+----2----+----3----+----4----+----5----+----6----+----7-|--+----| |
| 334 |
|
|
#endif /* ALLOW_THSICE */ |
| 335 |
|
|
|
| 336 |
|
|
RETURN |
| 337 |
|
|
END |
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