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C $Header: /u/gcmpack/MITgcm/pkg/frazil/frazil_calc_rhs.F,v 1.3 2012/03/04 23:11:20 dimitri Exp $ |
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C $Name: $ |
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|
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#include "FRAZIL_OPTIONS.h" |
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|
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CBOP |
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C !ROUTINE: FRAZIL_CALC_RHS |
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|
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C !INTERFACE: ========================================================== |
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SUBROUTINE FRAZIL_CALC_RHS( |
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I myTime, myIter, myThid ) |
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|
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C !DESCRIPTION: |
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C Check water temperature and if colder than freezing |
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C point bring excess negative heat to the surface. |
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|
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C !USES: =============================================================== |
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IMPLICIT NONE |
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#include "EEPARAMS.h" |
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#include "SIZE.h" |
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#include "PARAMS.h" |
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#include "GRID.h" |
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#include "DYNVARS.h" |
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#include "FFIELDS.h" |
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#ifdef ALLOW_FRAZIL |
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# include "FRAZIL.h" |
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#endif |
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|
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C !INPUT/OUTPUT PARAMETERS: |
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C myTime :: current time in simulation |
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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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_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_FRAZIL |
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|
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C !LOCAL VARIABLES: |
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C Tfreezing :: freezing threshold temperature |
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INTEGER bi,bj,i,j,k,kTop |
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_RL Tfreezing, Tresid, pLoc, sLoc, tLoc |
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_RL a0, a1, a2, b |
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PARAMETER( a0 = -0.0575 _d 0 ) |
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PARAMETER( a1 = 1.710523 _d -3 ) |
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PARAMETER( a2 = -2.154996 _d -4 ) |
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PARAMETER( b = -7.53 _d -4 ) |
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|
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_RL SW_TEMP |
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EXTERNAL SW_TEMP |
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|
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DO bj=myByLo(myThid),myByHi(myThid) |
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DO bi=myBxLo(myThid),myBxHi(myThid) |
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|
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C Initialize FrazilForcingT to zero |
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DO k=1,Nr |
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DO j=1-Oly,sNy+OLy |
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DO i=1-Olx,sNx+Olx |
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FrazilForcingT(i,j,k,bi,bj) = 0. _d 0 |
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ENDDO |
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ENDDO |
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ENDDO |
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|
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C Check for water below freezing point. |
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DO k = 2, Nr |
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DO j=1-OLy,sNy+OLy |
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DO i=1-OLx,sNx+OLx |
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IF ( maskC(i,j,k-1,bi,bj) .NE. 0. _d 0 .AND. |
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& maskC(i,j,k, bi,bj) .NE. 0. _d 0 ) THEN |
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|
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pLoc = ABS(RC(k)) |
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sLoc = MAX(salt(i,j,k,bi,bj), 0. _d 0) |
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tLoc = SW_TEMP(sLoc,theta(i,j,k,bi,bj),pLoc,0. _d 0) |
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|
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C Freezing point of seawater |
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C REFERENCE: UNESCO TECH. PAPERS IN THE MARINE SCIENCE NO. 28. 1978 |
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C EIGHTH REPORT JPOTS |
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C ANNEX 6 FREEZING POINT OF SEAWATER F.J. MILLERO PP.29-35. |
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C |
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C UNITS: |
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C PRESSURE P DECIBARS |
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C SALINITY S PSS-78 |
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C TEMPERATURE TF DEGREES CELSIUS |
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C FREEZING PT. |
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C************************************************************ |
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C CHECKVALUE: TF= -2.588567 DEG. C FOR S=40.0, P=500. DECIBARS |
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Tfreezing = (a0 + a1*sqrt(sLoc) + a2*sLoc) * sLoc + b*pLoc |
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|
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IF (tLoc .LT. Tfreezing) THEN |
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C Move the negative heat to surface level. |
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kTop = kSurfC(i,j,bi,bj) |
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Tresid = ( Tfreezing - tloc ) |
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& * HeatCapacity_Cp * rUnit2mass |
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& * drF(k) * _hFacC(i,j,k,bi,bj) |
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FrazilForcingT(i,j,k,bi,bj) = Tresid / dTtracerLev(k) |
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FrazilForcingT(i,j,kTop,bi,bj) = |
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& FrazilForcingT(i,j,kTop,bi,bj) |
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& - Tresid / dTtracerLev(kTop) |
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ENDIF |
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ENDIF |
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ENDDO |
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ENDDO |
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ENDDO |
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ENDDO |
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ENDDO |
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|
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# ifdef ALLOW_DIAGNOSTICS |
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IF ( useDiagnostics ) THEN |
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CALL DIAGNOSTICS_FILL( FrazilForcingT, 'FrzForcT', |
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& 0,Nr, 0, 1, 1, myThid ) |
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ENDIF |
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# endif /* ALLOW_DIAGNOSTICS */ |
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|
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#endif /* ALLOW_FRAZIL */ |
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|
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RETURN |
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END |
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