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gforget |
1.2 |
C $Header: /u/gcmpack/MITgcm/pkg/seaice/seaice_tracer_phys.F,v 1.1 2011/06/07 03:58:23 gforget Exp $ |
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gforget |
1.1 |
C $Name: $ |
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#include "SEAICE_OPTIONS.h" |
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CStartOfInterface |
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SUBROUTINE SEAICE_TRACER_PHYS( myTime, myIter, myThid ) |
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C /=======================================================\ |
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C | SUBROUTINE seaice_tracer_phys | |
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C | o Time step SItr/SItrEFF as a result of | |
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C | seaice thermodynamics and specific tracer physics | |
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C \=======================================================/ |
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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 "FFIELDS.h" |
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#include "DYNVARS.h" |
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#include "SEAICE_SIZE.h" |
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#include "SEAICE.h" |
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#include "SEAICE_PARAMS.h" |
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#include "SEAICE_TRACER.h" |
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C === Routine arguments === |
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C INPUT: |
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C myTime :: Simulation time |
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C myIter :: Simulation timestep number |
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C myThid :: Thread no. that called this routine. |
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C OUTPUT: |
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_RL myTime |
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INTEGER myIter, myThid |
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CEndOfInterface |
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C === Local variables === |
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#ifdef ALLOW_SITRACER |
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INTEGER iTr, jTh, I, J, bi, bj, ks |
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_RL SItrFromOcean (1:sNx,1:sNy) |
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gforget |
1.2 |
_RL SItrFromFlood (1:sNx,1:sNy) |
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gforget |
1.1 |
_RL HEFFprev, HEFFpost, growFact, meltPart, tmpscal1 |
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gforget |
1.2 |
_RL SItrExpand (1:sNx,1:sNy) |
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_RL AREAprev, AREApost, expandFact |
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gforget |
1.1 |
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#ifdef ALLOW_SITRACER_DIAG |
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_RL DIAGarray (1:sNx,1:sNy,Nr) |
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#endif |
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cgf for now I do not fully account for ocean-ice fluxes of tracer |
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cgf -> I just prescribe it consistent with age tracer |
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cgf eventually I will need to handle them as function params |
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ks=1 |
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DO bj=myByLo(myThid),myByHi(myThid) |
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DO bi=myBxLo(myThid),myBxHi(myThid) |
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DO iTr=1,SItrMaxNum |
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c 0) set ice-ocean and ice-snow exchange values |
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c ============================================= |
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DO J=1,sNy |
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DO I=1,sNx |
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SItrFromOcean(i,j)=0. _d 0 |
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gforget |
1.2 |
SItrFromFlood(i,j)=0. _d 0 |
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SItrExpand(i,j)=0. _d 0 |
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gforget |
1.1 |
ENDDO |
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ENDDO |
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if (SItrName(iTr).EQ.'age') then |
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gforget |
1.2 |
c age tracer: no age in ocean, or effect from ice cover changes |
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gforget |
1.1 |
elseif (SItrName(iTr).EQ.'salinity') then |
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c salinity tracer: |
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DO J=1,sNy |
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DO I=1,sNx |
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SItrFromOcean(i,j)=SIsal0 |
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#ifdef SEAICE_VARIABLE_SALINITY |
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if (SIsalFRAC.GT.0.) |
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& SItrFromOcean(i,j)=SIsalFRAC*salt(I,j,ks,bi,bj) |
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#endif |
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gforget |
1.2 |
c as of now, flooding implies no salt extraction from ocean |
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gforget |
1.1 |
ENDDO |
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ENDDO |
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elseif (SItrName(iTr).EQ.'one') then |
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c "ice concentration" tracer that should remain .EQ.1. |
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DO J=1,sNy |
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DO I=1,sNx |
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SItrFromOcean(i,j)=1. _d 0 |
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gforget |
1.2 |
SItrFromFlood(i,j)=1. _d 0 |
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gforget |
1.1 |
ENDDO |
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ENDDO |
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endif |
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c 1) seaice thermodynamics processes |
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c ================================== |
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gforget |
1.2 |
if (SItrMate(iTr).EQ.'HEFF') then |
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gforget |
1.1 |
DO J=1,sNy |
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DO I=1,sNx |
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HEFFprev=SItrHEFF(i,j,bi,bj,1) |
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#ifdef ALLOW_SITRACER_DIAG |
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diagArray(I,J,5+(iTr-1)*5) = |
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& HEFFprev*SItracer(i,j,bi,bj,iTr) + SItrBucket(i,j,bi,bj,iTr) |
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#endif |
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c apply the sequence of thermodynamics increments to actual traceur |
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c (see seaice_growth.F) |
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c (jTh=1 tendency due to ice-ocean interaction) |
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c (jTh=2 tendency due to the atmosphere, over ice covered part) |
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c (jTh=3 tendency due to the atmosphere, over open water part) |
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c (jTh=4 tendency due to flooding) |
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DO jTh=1,3 |
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HEFFprev=SItrHEFF(i,j,bi,bj,jTh) |
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HEFFpost=SItrHEFF(i,j,bi,bj,jTh+1) |
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c compute ratio in [0. 1.] range for either growth or melt |
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growFact=1. _d 0 |
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meltPart=0. _d 0 |
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if (HEFFpost.GT.HEFFprev) growFact=HEFFprev/HEFFpost |
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if (HEFFpost.LT.HEFFprev) meltPart=HEFFprev-HEFFpost |
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c update SItr accordingly |
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SItracer(i,j,bi,bj,iTr)=SItracer(i,j,bi,bj,iTr)*growFact |
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& +SItrFromOcean(i,j)*(1. _d 0 - growFact) |
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SItrBucket(i,j,bi,bj,iTr)=SItrBucket(i,j,bi,bj,iTr) |
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& -HEFFpost*SItrFromOcean(i,j)*(1. _d 0 - growFact) |
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SItrBucket(i,j,bi,bj,iTr)=SItrBucket(i,j,bi,bj,iTr) |
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& +meltPart*SItracer(i,j,bi,bj,iTr) |
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ENDDO |
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c apply flooding term |
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growFact=1. _d 0 |
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HEFFprev=SItrHEFF(i,j,bi,bj,4) |
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HEFFpost=SItrHEFF(i,j,bi,bj,5) |
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if (HEFFpost.GT.HEFFprev) growFact=HEFFprev/HEFFpost |
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SItracer(i,j,bi,bj,iTr)=SItracer(i,j,bi,bj,iTr)*growFact |
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gforget |
1.2 |
& +SItrFromFlood(i,j) *(1. _d 0 - growFact) |
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c rk: flooding can only imply an ocean-ice tracer exchange, as long |
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c as we dont have snow tracers, so it goes through SItrBucket. |
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gforget |
1.1 |
SItrBucket(i,j,bi,bj,iTr)=SItrBucket(i,j,bi,bj,iTr) |
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gforget |
1.2 |
& -HEFFpost*SItrFromFlood(i,j)*(1. _d 0 - growFact) |
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gforget |
1.1 |
#ifdef ALLOW_SITRACER_DIAG |
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diagArray(I,J,5+(iTr-1)*5) = HEFFpost*SItracer(i,j,bi,bj,iTr) |
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& +SItrBucket(i,j,bi,bj,iTr)-diagArray(I,J,5+(iTr-1)*5) |
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#endif |
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ENDDO |
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ENDDO |
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gforget |
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c TAF? if (SItrMate(iTr).EQ.'AREA') then |
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else |
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c 1) or seaice cover expansion |
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c ============================ |
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c this is much simpler than for ice volume/mass tracers, because |
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c properties of the ice surface are not be conserved across the |
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c ocean-ice system, the contraction/expansion terms are all |
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c simultaneous (which is sane), and the only generic effect |
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c is due to expansion (new cover). |
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DO J=1,sNy |
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DO I=1,sNx |
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c apply expansion |
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AREAprev=SItrAREA(i,j,bi,bj,2) |
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AREApost=SItrAREA(i,j,bi,bj,3) |
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c compute ratio in [0. 1.] range for expansion/contraction |
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expandFact=1. _d 0 |
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if (AREApost.GT.AREAprev) expandFact=AREAprev/AREApost |
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c update SItr accordingly |
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SItracer(i,j,bi,bj,iTr)=SItracer(i,j,bi,bj,iTr)*expandFact |
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& +SItrExpand(i,j)*(1. _d 0 - expandFact) |
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ENDDO |
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ENDDO |
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endif |
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gforget |
1.1 |
c 2) very ice tracer processes |
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c ============================ |
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if (SItrName(iTr).EQ.'age') then |
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c age tracer: grow old as time passes by |
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DO J=1,sNy |
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DO I=1,sNx |
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gforget |
1.2 |
if (( (SItrHEFF(i,j,bi,bj,5).GT.0. _d 0).AND.(SItrMate(iTr) |
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& .EQ.'HEFF') ).OR.( (SItrAREA(i,j,bi,bj,3).GT.0. _d 0).AND. |
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& (SItrMate(iTr).EQ.'AREA') )) then |
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gforget |
1.1 |
SItracer(i,j,bi,bj,iTr)= |
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& SItracer(i,j,bi,bj,iTr)+SEAICE_deltaTtherm |
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else |
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SItracer(i,j,bi,bj,iTr)=0. _d 0 |
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endif |
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ENDDO |
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ENDDO |
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elseif (SItrName(iTr).EQ.'salinity') then |
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c salinity tracer: no specific process |
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elseif (SItrName(iTr).EQ.'one') then |
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c "ice concentration" tracer: no specific process |
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gforget |
1.2 |
elseif (SItrName(iTr).EQ.'ridge') then |
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c simple, made up, ice surface roughness index prototype |
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#ifndef SEAICE_GROWTH_LEGACY |
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DO J=1,sNy |
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DO I=1,sNx |
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c ridging increases roughness |
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SItracer(i,j,bi,bj,iTr)=SItracer(i,j,bi,bj,iTr)+ |
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& MAX(0. _d 0, SItrAREA(i,j,bi,bj,1)-SItrAREA(i,j,bi,bj,2)) |
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c ice melt reduces ridges/roughness |
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HEFFprev=SItrHEFF(i,j,bi,bj,1) |
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HEFFpost=SItrHEFF(i,j,bi,bj,4) |
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tmpscal1=1. _d 0 |
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if (HEFFprev.GT.HEFFpost) tmpscal1=HEFFpost/HEFFprev |
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SItracer(i,j,bi,bj,iTr)=SItracer(i,j,bi,bj,iTr)*tmpscal1 |
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ENDDO |
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ENDDO |
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#endif |
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gforget |
1.1 |
endif |
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gforget |
1.2 |
c 3) ice-ocean tracer exchange/mapping to external variables |
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c ========================================================== |
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gforget |
1.1 |
if (SItrName(iTr).EQ.'age') then |
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c age tracer: not passed to ocean |
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elseif (SItrName(iTr).EQ.'salinity') then |
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c salinity tracer: salt flux |
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c DO J=1,sNy |
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c DO I=1,sNx |
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c saltFlux(I,J,bi,bj) = - SItrBucket(i,j,bi,bj,iTr) |
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c & *HEFFM(I,J,bi,bj)/SEAICE_deltaTtherm*SEAICE_rhoIce |
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c note: at this point of the time step, that is the correct sign |
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c saltPlumeFlux(I,J,bi,bj) = ... |
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c ENDDO |
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c ENDDO |
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elseif (SItrName(iTr).EQ.'one') then |
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c "ice concentration" tracer: not passed to ocean |
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endif |
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DO J=1,sNy |
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DO I=1,sNx |
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#ifdef ALLOW_SITRACER_DIAG |
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diagArray(I,J,4+(iTr-1)*5) = - SItrBucket(i,j,bi,bj,iTr) |
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& *HEFFM(I,J,bi,bj)/SEAICE_deltaTtherm*SEAICE_rhoIce |
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#endif |
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c empty bucket |
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SItrBucket(i,j,bi,bj,iTr)=0. _d 0 |
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ENDDO |
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ENDDO |
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gforget |
1.2 |
c TAF? elseif (SItrMate(iTr).EQ.'AREA') then |
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gforget |
1.1 |
c 4) diagnostics |
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c ============== |
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#ifdef ALLOW_SITRACER_DIAG |
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gforget |
1.2 |
if (SItrMate(iTr).EQ.'HEFF') then |
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gforget |
1.1 |
DO J=1,sNy |
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DO I=1,sNx |
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HEFFpost=SItrHEFF(i,j,bi,bj,5) |
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DIAGarray(I,J,1+(iTr-1)*5) = SItracer(i,j,bi,bj,iTr) |
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DIAGarray(I,J,2+(iTr-1)*5) = SItracer(i,j,bi,bj,iTr)*HEFFpost |
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c diagArray(:,:,3) is the term of comparison for diagArray(:,:,2) |
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if (SItrName(iTr).EQ.'age') then |
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DIAGarray(I,J,3+(iTr-1)*5) = IceAgeTr(i,j,bi,bj,2) |
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elseif (SItrName(iTr).EQ.'salinity') then |
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DIAGarray(I,J,3+(iTr-1)*5) = HSALT(i,j,bi,bj)/SEAICE_rhoIce |
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elseif (SItrName(iTr).EQ.'one') then |
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DIAGarray(I,J,3+(iTr-1)*5) = HEFFpost |
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endif |
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c diagArray(:,:,4) allows check of conservation : del(SItrBucket)+del(SItr*HEFF)=0. over do_phys |
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c diagArray(:,:,5) is the tracer flux from the ocean (<0 incr. ocean tracer) |
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ENDDO |
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ENDDO |
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gforget |
1.2 |
else |
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DO J=1,sNy |
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DO I=1,sNx |
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AREApost=SItrAREA(i,j,bi,bj,3) |
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DIAGarray(I,J,1+(iTr-1)*5) = SItracer(i,j,bi,bj,iTr) |
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DIAGarray(I,J,2+(iTr-1)*5) = SItracer(i,j,bi,bj,iTr)*AREApost |
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c diagArray(:,:,3) is the term of comparison for diagArray(:,:,2) |
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if (SItrName(iTr).EQ.'age') then |
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DIAGarray(I,J,3+(iTr-1)*5) = IceAgeTr(i,j,bi,bj,1) |
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endif |
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ENDDO |
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ENDDO |
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endif |
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gforget |
1.1 |
#endif |
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ENDDO |
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#ifdef ALLOW_SITRACER_DIAG |
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CALL DIAGNOSTICS_FILL(DIAGarray,'UDIAG1 ',0,Nr,3,bi,bj,myThid) |
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#endif |
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ENDDO |
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ENDDO |
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#endif /* ALLOW_SITRACER */ |
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RETURN |
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END |
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