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C $Header: /u/gcmpack/MITgcm/pkg/thsice/thsice_step_fwd.F,v 1.1 2003/11/23 01:20:13 jmc Exp $ |
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C $Name: $ |
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|
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#include "THSICE_OPTIONS.h" |
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|
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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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I myTime, myIter, myThid ) |
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C *==========================================================* |
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C | SUBROUTINE THSICE_STEP_FWD |
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C | o Step Forward Therm-SeaIce model. |
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C *==========================================================* |
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|
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C !USES: |
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IMPLICIT NONE |
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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 "DYNVARS.h" |
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#include "GRID.h" |
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#ifdef ALLOW_BULK_FORCE |
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#include "BULKF.h" |
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#endif |
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#include "THSICE_SIZE.h" |
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#include "THSICE_PARAMS.h" |
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#include "THSICE.h" |
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#include "THSICE_DIAGS.h" |
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|
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C !INPUT/OUTPUT PARAMETERS: |
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C === Routine arguments === |
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C myIter :: iteration counter for this thread |
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C myTime :: time counter for this thread |
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C myThid :: thread number for this instance of the routine. |
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INTEGER bi,bj |
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INTEGER iMin, iMax |
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INTEGER jMin, jMax |
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_RL myTime |
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INTEGER myIter |
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INTEGER myThid |
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|
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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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C snowAge :: snow age (s) |
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C albedo :: surface albedo [0-1] |
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C fSWabs :: net Short-Wave (+ = down) at surface (W m-2) |
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C Fbot :: the oceanic heat flux already incorporated (ice_therm) |
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C flxAtm :: net heat flux from the atmosphere ( >0 downward) |
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C evpAtm :: evaporation to the atmosphere |
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C frwAtm :: net fresh-water flux (E-P-R) to the atmosphere (m/s) |
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C qleft :: net heat flux from the ice to the ocean |
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C ffresh :: 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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INTEGER i,j |
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_RL snowAge |
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_RL albedo |
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_RL fSWabs |
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_RL qleft, qNewIce |
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_RL fsalt |
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_RL ffresh |
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_RL Tf, cphm, frzmlt |
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_RL Fbot, esurp |
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_RL flxAtm, evpAtm, frwAtm |
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_RL openFrac, iceFrac, qicAv |
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_RL oceHs, oceV2s, oceSs, oceTs |
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_RL compact, hIce, hSnow, Tsf, Tice(nlyr), qicen(nlyr) |
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|
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LOGICAL dBug |
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|
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dBug = .FALSE. |
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1010 FORMAT(A,1P4E11.3) |
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|
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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.13 .AND. j.EQ.13 ) |
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|
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Tf = -mu_Tf*salt(i,j,1,bi,bj) |
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cphm = cpwater*rhosw*drF(1)*hFacC(i,j,1,bi,bj) |
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oceTs = theta(i,j,1,bi,bj) |
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frzmlt = (Tf-oceTs)*cphm/thSIce_deltaT |
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compact= iceMask(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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Fbot = 0. _d 0 |
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snow(i,j,bi,bj) = 0. _d 0 |
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saltFlux(i,j,bi,bj) = 0. _d 0 |
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|
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IF (dBug .AND. (frzmlt.GT.0. .OR. compact.GT.0.) ) THEN |
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WRITE(6,1010) 'ThSI_FWD:-0- iceMask,hIc,hSn,Qnet=', |
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& compact, hIce, hSnow, Qnet(i,j,bi,bj) |
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WRITE(6,1010) 'ThSI_FWD: ocTs,Tf,frzmlt=', |
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& oceTs,Tf,frzmlt |
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ENDIF |
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|
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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 can only reduce the ice-fraction but not increase it. |
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C------- |
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IF (iceMask(i,j,bi,bj).GT.0. _d 0) THEN |
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oceHs = hfacC(i,j,1,bi,bj)*drF(1) |
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oceSs = salt (i,j,1,bi,bj) |
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oceV2s = ( uvel(i,j,1,bi,bj)*uvel(i,j,1,bi,bj) |
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& + uvel(i+1,j,1,bi,bj)*uvel(i+1,j,1,bi,bj) |
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& + vvel(i,j+1,1,bi,bj)*vvel(i,j+1,1,bi,bj) |
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& + vvel(i,j,1,bi,bj)*vvel(i,j,1,bi,bj) )*0.5 _d 0 |
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snowAge = sage(i,j,bi,bj) |
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c snowAge = thSIce_deltaT |
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Tsf = Tsrf(i,j,bi,bj) |
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Tice(1) = Tice1(i,j,bi,bj) |
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Tice(2) = Tice2(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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CALL THSICE_ALBEDO(hIce,hSnow,Tsf,snowAge,albedo) |
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fSWabs = solar(i,j,bi,bj)*(1. _d 0 - albedo) |
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CALL THSICE_THERM( |
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I fSWabs, oceHs, oceV2s, oceSs, oceTs, |
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U compact, hIce, hSnow, Tsf, Tice, qicen, |
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O qleft, ffresh, fsalt, Fbot, |
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O flxAtm, evpAtm, |
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I i,j, bi,bj, myThid) |
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|
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C-- Diagnostic of Atmospheric Fluxes over sea-ice : |
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frwAtm = evpAtm - snow(i,j,bi,bj)*rhos/rhofw |
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C note: Any flux of mass (here fresh water) that enter or leave the system |
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C with a non zero energy HAS TO be counted: add snow precip. |
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flxAtm = flxAtm - Lfresh*snow(i,j,bi,bj)*rhos |
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|
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C---+----1----+----2----+----3----+----4----+----5----+----6----+----7-|--+----| |
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IF (dBug) WRITE(6,1010) 'ThSI_FWD: iceFrac,flxAtm,evpAtm,flxSnw=', |
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& iceMask(i,j,bi,bj),flxAtm,evpAtm,-Lfresh*snow(i,j,bi,bj)*rhos |
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IF (dBug) WRITE(6,1010) 'ThSI_FWD: compact,qleft,fsalt,ffresh=', |
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& compact,qleft,fsalt,ffresh |
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#ifdef CHECK_ENERGY_CONSERV |
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iceFrac = iceMask(i,j,bi,bj) |
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CALL THSICE_CHECK_CONSERV( dBug, i, j, bi, bj, 0, |
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I iceFrac, compact, hIce, hSnow, qicen, |
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I qleft, ffresh, fsalt, flxAtm, frwAtm, |
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I myTime, myIter, myThid ) |
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#endif /* CHECK_ENERGY_CONSERV */ |
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C---+----1----+----2----+----3----+----4----+----5----+----6----+----7-|--+----| |
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|
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C-- Update Sea-Ice state : |
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c iceMask(i,j,bi,bj)=compact |
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iceheight(i,j,bi,bj) = hIce |
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snowheight(i,j,bi,bj)= hSnow |
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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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|
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C-- Net fluxes : |
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ffresh = ffresh/rhofw |
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ffresh = -ffresh-rain(i,j,bi,bj)-runoff(i,j,bi,bj) |
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frwAtm = frwAtm-rain(i,j,bi,bj)-runoff(i,j,bi,bj) |
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iceFrac = iceMask(i,j,bi,bj) |
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openFrac= 1. _d 0-iceFrac |
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#ifdef ALLOW_TIMEAVE |
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ICE_Qnet_AVE(i,j,bi,bj) = ICE_Qnet_AVE(i,j,bi,bj) |
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& + ( -iceFrac*flxAtm + openFrac*Qnet(i,j,bi,bj) |
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& )*thSIce_deltaT |
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ICE_FWfx_AVE(i,j,bi,bj) = ICE_FWfx_AVE(i,j,bi,bj) |
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& + ( iceFrac*frwAtm + openFrac*EmPmR(i,j,bi,bj) |
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& )*thSIce_deltaT |
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ICE_albedo_AVE(i,j,bi,bj) = ICE_albedo_AVE(i,j,bi,bj) |
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& + iceFrac*albedo*thSIce_deltaT |
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#endif /*ALLOW_TIMEAVE*/ |
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Qnet(i,j,bi,bj)=-iceFrac*qleft + openFrac*Qnet(i,j,bi,bj) |
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EmPmR(i,j,bi,bj)=iceFrac*ffresh+openFrac*EmPmR(i,j,bi,bj) |
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saltFlux(i,j,bi,bj)=-iceFrac*fsalt |
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|
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IF (dBug) WRITE(6,1010)'ThSI_FWD:-1- compact,hIc,hSn,Qnet=', |
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& compact,hIce,hSnow,Qnet(i,j,bi,bj) |
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|
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ELSEIF (hFacC(i,j,1,bi,bj).gt.0. _d 0) THEN |
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|
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#ifdef ALLOW_TIMEAVE |
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ICE_Qnet_AVE(i,j,bi,bj) = ICE_Qnet_AVE(i,j,bi,bj) |
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& +Qnet(i,j,bi,bj)*thSIce_deltaT |
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ICE_FWfx_AVE(i,j,bi,bj) = ICE_FWfx_AVE(i,j,bi,bj) |
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& +EmPmR(i,j,bi,bj)*thSIce_deltaT |
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#endif /*ALLOW_TIMEAVE*/ |
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|
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ENDIF |
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|
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C---+----1----+----2----+----3----+----4----+----5----+----6----+----7-|--+----| |
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C part.2 : freezing of sea-water |
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C over ice-free fraction and what is left from ice-covered fraction |
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C------- |
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esurp = frzmlt - Fbot*iceMask(i,j,bi,bj) |
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IF (esurp.GT.0. _d 0) THEN |
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iceFrac = compact |
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IF ( compact.GT.0. _d 0 ) THEN |
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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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ELSE |
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qicen(1)= -cpwater*Tmlt1 |
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& + cpice *(Tmlt1-Tf) + Lfresh*(1. _d 0-Tmlt1/Tf) |
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qicen(2)= -cpice *Tf + Lfresh |
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ENDIF |
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qicAv = rhoi*(qicen(1)+qicen(2))*0.5 _d 0 |
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CALL THSICE_START( myThid, |
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I esurp, qicAv, Tf, |
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O qNewIce, ffresh, fsalt, |
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U oceTs, compact, hIce, hSnow ) |
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C---+----1----+----2----+----3----+----4----+----5----+----6----+----7-|--+----| |
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IF (dBug) WRITE(6,1010) 'ThSI_FWD: compact,qNewIce,fsalt,ffresh=' |
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& ,compact,qNewIce,fsalt,ffresh |
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#ifdef CHECK_ENERGY_CONSERV |
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flxAtm = 0. |
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frwAtm = 0. |
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CALL THSICE_CHECK_CONSERV( dBug, i, j, bi, bj, 1, |
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I iceFrac, compact, hIce, hSnow, qicen, |
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I qNewIce, ffresh, fsalt, flxAtm, frwAtm, |
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I myTime, myIter, myThid ) |
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#endif /* CHECK_ENERGY_CONSERV */ |
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C---+----1----+----2----+----3----+----4----+----5----+----6----+----7-|--+----| |
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C-- Update Sea-Ice state : |
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IF ( compact.GT.0. _d 0 .AND. iceFrac.EQ.0. _d 0) THEN |
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Tsrf(i,j,bi,bj) = Tf |
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Tice1(i,j,bi,bj) = Tf |
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Tice2(i,j,bi,bj) = Tf |
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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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ENDIF |
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iceheight(i,j,bi,bj) = hIce |
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snowheight(i,j,bi,bj)= hSnow |
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C-- Net fluxes : |
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Qnet(i,j,bi,bj) = Qnet(i,j,bi,bj) - qNewIce |
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EmPmR(i,j,bi,bj)= EmPmR(i,j,bi,bj)- ffresh/rhofw |
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saltFlux(i,j,bi,bj)=saltFlux(i,j,bi,bj) - fsalt |
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|
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IF (dBug) WRITE(6,1010)'ThSI_FWD:-2- compact,hIc,hSn,Qnet=', |
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& compact,hIce,hSnow,Qnet(i,j,bi,bj) |
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C-- - if esurp > 0 : end |
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ENDIF |
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|
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IF ( compact .GT. 0. _d 0 ) THEN |
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iceMask(i,j,bi,bj)=compact |
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IF ( hSnow .EQ. 0. _d 0 ) sage(i,j,bi,bj) = 0. _d 0 |
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ELSE |
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iceMask(i,j,bi,bj) = 0. _d 0 |
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iceHeight(i,j,bi,bj)= 0. _d 0 |
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snowHeight(i,j,bi,bj)=0. _d 0 |
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sage(i,j,bi,bj) = 0. _d 0 |
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Tsrf(i,j,bi,bj) = oceTs |
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Tice1(i,j,bi,bj) = 0. _d 0 |
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Tice2(i,j,bi,bj) = 0. _d 0 |
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Qice1(i,j,bi,bj) = 0. _d 0 |
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Qice2(i,j,bi,bj) = 0. _d 0 |
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ENDIF |
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|
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#ifndef CHECK_ENERGY_CONSERV |
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#ifdef ALLOW_TIMEAVE |
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ICE_qleft_AVE(i,j,bi,bj)=ICE_qleft_AVE(i,j,bi,bj) |
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& + ( Qnet(i,j,bi,bj) |
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& )*thSIce_deltaT |
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ICE_fresh_AVE(i,j,bi,bj)=ICE_fresh_AVE(i,j,bi,bj) |
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& + ( EmPmR(i,j,bi,bj) |
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& )*thSIce_deltaT |
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ICE_salFx_AVE(i,j,bi,bj)=ICE_salFx_AVE(i,j,bi,bj) |
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& +saltFlux(i,j,bi,bj)*thSIce_deltaT |
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#endif /* ALLOW_TIMEAVE */ |
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#endif /* CHECK_ENERGY_CONSERV */ |
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|
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ENDDO |
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ENDDO |
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|
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C---+----1----+----2----+----3----+----4----+----5----+----6----+----7-|--+----| |
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#endif /* ALLOW_THSICE */ |
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|
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RETURN |
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END |
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