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C $Header: /u/gcmpack/MITgcm/pkg/thsice/thsice_extend.F,v 1.7 2007/05/01 02:37:44 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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CBOP |
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C !ROUTINE: THSICE_EXTEND |
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C !INTERFACE: |
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SUBROUTINE THSICE_EXTEND( |
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I bi, bj, siLo, siHi, sjLo, sjHi, |
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I iMin,iMax, jMin,jMax, dBugFlag, |
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I fzMlOc, tFrz, tOce, |
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U icFrac, hIce, hSnow, |
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U tSrf, tIc1, tIc2, qIc1, qIc2, |
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O flx2oc, frw2oc, fsalt, |
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I myTime, myIter, myThid ) |
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C !DESCRIPTION: \bv |
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C *==========================================================* |
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C | S/R THSICE_EXTEND |
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C | o Extend sea-ice area incresing ice fraction |
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C *==========================================================* |
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C | o incorporate surplus of energy to |
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C | make new ice or make ice grow laterally |
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C *==========================================================* |
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C \ev |
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|
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C !USES: |
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IMPLICIT NONE |
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|
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C == Global variables == |
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#include "EEPARAMS.h" |
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#include "THSICE_SIZE.h" |
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#include "THSICE_PARAMS.h" |
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#ifdef ALLOW_AUTODIFF_TAMC |
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# include "SIZE.h" |
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# include "tamc.h" |
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# include "tamc_keys.h" |
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#endif |
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|
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C !INPUT/OUTPUT PARAMETERS: |
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C == Routine Arguments == |
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C siLo,siHi :: size of input/output array: 1rst dim. lower,higher bounds |
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C sjLo,sjHi :: size of input/output array: 2nd dim. lower,higher bounds |
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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 dBugFlag :: allow to print debugging stuff (e.g. on 1 grid point). |
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C--- Input: |
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C iceMask :: sea-ice fractional mask [0-1] |
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C fzMlOc (esurp) :: ocean mixed-layer freezing/melting potential [W/m2] |
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C tFrz (Tf) :: sea-water freezing temperature [oC] (function of S) |
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C tOce :: surface level oceanic temperature [oC] |
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C--- Modified (input&output): |
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C icFrac(iceFrac):: fraction of grid area covered in ice |
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C hIce (iceThick):: ice height [m] |
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C hSnow :: snow height [m] |
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C tSrf :: surface (ice or snow) temperature [oC] |
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C tIc1 :: temperature of ice layer 1 [oC] |
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C tIc2 :: temperature of ice layer 2 [oC] |
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C qIc1 (qicen) :: ice enthalpy (J/kg), 1rst level |
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C qIc2 (qicen) :: ice enthalpy (J/kg), 2nd level |
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C--- Output |
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C flx2oc (=) :: (additional) heat flux to ocean [W/m2] (+=dwn) |
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C frw2oc (=) :: (additional) fresh water flux to ocean [kg/m2/s] (+=dwn) |
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C fsalt (=) :: (additional) salt flux to ocean [g/m2/s] (+=dwn) |
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C--- Input: |
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C myTime :: current Time of simulation [s] |
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C myIter :: current Iteration number in simulation |
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C myThid :: my Thread Id number |
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INTEGER siLo, siHi, sjLo, sjHi |
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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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LOGICAL dBugFlag |
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c _RL iceMask(siLo:siHi,sjLo:sjHi) |
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_RL fzMlOc (siLo:siHi,sjLo:sjHi) |
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_RL tFrz (siLo:siHi,sjLo:sjHi) |
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_RL tOce (siLo:siHi,sjLo:sjHi) |
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_RL icFrac (siLo:siHi,sjLo:sjHi) |
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_RL hIce (siLo:siHi,sjLo:sjHi) |
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_RL hSnow (siLo:siHi,sjLo:sjHi) |
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_RL tSrf (siLo:siHi,sjLo:sjHi) |
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_RL tIc1 (siLo:siHi,sjLo:sjHi) |
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_RL tIc2 (siLo:siHi,sjLo:sjHi) |
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_RL qIc1 (siLo:siHi,sjLo:sjHi) |
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_RL qIc2 (siLo:siHi,sjLo:sjHi) |
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_RL flx2oc (siLo:siHi,sjLo:sjHi) |
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_RL frw2oc (siLo:siHi,sjLo:sjHi) |
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_RL fsalt (siLo:siHi,sjLo:sjHi) |
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_RL myTime |
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INTEGER myIter |
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INTEGER myThid |
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CEOP |
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|
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#ifdef ALLOW_THSICE |
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C !LOCAL VARIABLES: |
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C--- local copy of input/output argument list variables (see description above) |
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_RL esurp |
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_RL Tf |
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_RL iceFrac |
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_RL iceThick |
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_RL qicen(nlyr) |
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|
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C == Local variables == |
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C iceVol :: previous ice volume |
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C newIce :: new ice volume to produce |
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C hNewIce :: thickness of new ice to form |
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C iceFormed :: ice-volume formed (new ice volume = iceVol+iceFormed ) |
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C qicAv :: mean enthalpy of ice (layer 1 & 2) [J/m^3] |
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_RL deltaTice ! time-step for ice model |
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_RL iceVol |
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_RL newIce |
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_RL hNewIce |
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_RL iceFormed |
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_RL qicAv |
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INTEGER i,j ! loop indices |
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|
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C- define grid-point location where to print debugging values |
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#include "THSICE_DEBUG.h" |
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|
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1010 FORMAT(A,I3,3F8.3) |
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1020 FORMAT(A,1P4E11.3) |
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|
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C---+----1----+----2----+----3----+----4----+----5----+----6----+----7-|--+----| |
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|
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#ifdef ALLOW_AUTODIFF_TAMC |
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act1 = bi - myBxLo(myThid) |
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max1 = myBxHi(myThid) - myBxLo(myThid) + 1 |
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act2 = bj - myByLo(myThid) |
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max2 = myByHi(myThid) - myByLo(myThid) + 1 |
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act3 = myThid - 1 |
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max3 = nTx*nTy |
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act4 = ikey_dynamics - 1 |
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#endif /* ALLOW_AUTODIFF_TAMC */ |
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|
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deltaTice = thSIce_deltaT |
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|
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DO j = jMin, jMax |
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DO i = iMin, iMax |
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#ifdef ALLOW_AUTODIFF_TAMC |
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ikey_1 = i |
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& + sNx*(j-1) |
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& + sNx*sNy*act1 |
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& + sNx*sNy*max1*act2 |
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& + sNx*sNy*max1*max2*act3 |
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& + sNx*sNy*max1*max2*max3*act4 |
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#endif /* ALLOW_AUTODIFF_TAMC */ |
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C-- |
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#ifdef ALLOW_AUTODIFF_TAMC |
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CADJ STORE hice(i,j) = comlev1_thsice_1, key=ikey_1 |
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CADJ STORE hsnow(i,j) = comlev1_thsice_1, key=ikey_1 |
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CADJ STORE icfrac(i,j) = comlev1_thsice_1, key=ikey_1 |
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CADJ STORE qic1(i,j) = comlev1_thsice_1, key=ikey_1 |
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CADJ STORE qic2(i,j) = comlev1_thsice_1, key=ikey_1 |
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#endif |
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|
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IF (fzMlOc(i,j).GT.0. _d 0) THEN |
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esurp = fzMlOc(i,j) |
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Tf = tFrz(i,j) |
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iceFrac = icFrac(i,j) |
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iceThick= hIce(i,j) |
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qicen(1)= qIc1(i,j) |
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qicen(2)= qIc2(i,j) |
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C--- |
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C-- start ice |
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iceFormed = 0. _d 0 |
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iceVol = iceFrac*iceThick |
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|
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C- enthalpy of new ice to form : |
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IF ( iceFrac.LE.0. _d 0 ) THEN |
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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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newIce = esurp*deltaTice/qicAv |
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|
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IF ( icFrac(i,j).EQ.0. _d 0 ) THEN |
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C- to keep identical results (as it use to be): |
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c-old_v IF ( newIce.GE.hThinIce*iceMaskMin ) THEN |
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C- here we allow to form ice earlier (as soon as min-ice-vol is reached) |
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c-new_v: |
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IF ( newIce.GT.hIceMin*iceMaskMin ) THEN |
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C- if there is no ice in grid-cell and enough ice to form: |
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C- make ice over iceMaskMin fraction, up to hThinIce, |
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C and if more ice to form, then increase fraction |
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iceThick = MIN(hThinIce,newIce/iceMaskMin) |
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iceThick = MAX(iceThick,newIce/iceMaskMax) |
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iceFrac = newIce/iceThick |
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iceFormed = newIce |
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ENDIF |
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ELSEIF ( iceVol.LT.hiMax*iceMaskMax ) THEN |
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C- if there is already some ice |
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C create ice with same thickness or hNewIceMax (the smallest of the 2) |
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hNewIce = MIN(iceThick,hNewIceMax) |
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iceFrac = MIN(icFrac(i,j)+newIce/hNewIce,iceMaskMax) |
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C- update thickness: area weighted average |
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c-new_v: |
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iceThick = MIN(hiMax,(iceVol+newIce)/iceFrac) |
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C- to keep identical results: comment the line above and uncomment line below: |
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c-old_v iceFrac = MIN(icFrac(i,j)+newIce/iceThick,iceMaskMax) |
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iceFormed = iceThick*iceFrac - iceVol |
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C- spread snow out over ice |
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hSnow(i,j) = hSnow(i,j)*icFrac(i,j)/iceFrac |
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ENDIF |
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C- oceanic fluxes: |
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flx2oc(i,j)= qicAv*iceFormed/deltaTice |
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frw2oc(i,j)= -rhoi*iceFormed/deltaTice |
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fsalt(i,j)= -(rhoi*saltIce)*iceFormed/deltaTice |
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|
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C---+----1----+----2----+----3----+----4----+----5----+----6----+----7-|--+----| |
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#ifdef ALLOW_DBUG_THSICE |
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IF ( dBug(i,j,bi,bj) ) THEN |
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WRITE(6,1020) 'ThSI_EXT: iceH, newIce, newIceFrac=', |
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& iceThick, newIce, iceFrac-icFrac(i,j) |
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WRITE(6,1020) 'ThSI_EXT: iceFrac,flx2oc,fsalt,frw2oc=', |
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& iceFrac,flx2oc(i,j),fsalt(i,j),frw2oc(i,j) |
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ENDIF |
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#endif |
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#ifdef CHECK_ENERGY_CONSERV |
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CALL THSICE_CHECK_CONSERV( dBugFlag, i, j, bi, bj, 1, |
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I icFrac(i,j), iceFrac, iceThick, hSnow(i,j), qicen, |
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I flx2oc(i,j), frw2oc(i,j), fsalt(i,j), |
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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 output: |
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IF ( iceFrac.GT.0. _d 0 .AND. icFrac(i,j).EQ.0. _d 0) THEN |
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c hSnow(i,j) = 0. _d 0 |
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tSrf(i,j) = tFrz(i,j) |
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tIc1(i,j) = tFrz(i,j) |
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tIc2(i,j) = tFrz(i,j) |
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qIc1(i,j) = qicen(1) |
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qIc2(i,j) = qicen(2) |
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ENDIF |
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icFrac(i,j) = iceFrac |
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hIce(i,j) = iceThick |
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ENDIF |
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ENDDO |
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ENDDO |
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|
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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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