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torge |
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C $Header: /u/gcmpack/MITgcm/pkg/seaice/seaice_budget_ocean.F,v 1.19 2012/11/09 22:15:18 heimbach Exp $ |
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torge |
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C $Name: $ |
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#include "SEAICE_OPTIONS.h" |
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CStartOfInterface |
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SUBROUTINE SEAICE_BUDGET_OCEAN( |
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I UG, |
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I TSURF, |
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O netHeatFlux, SWHeatFlux, |
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I bi, bj, myTime, myIter, myThid ) |
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C *================================================================* |
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C | SUBROUTINE seaice_budget_ocean |
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C | o Calculate surface heat fluxes over open ocean |
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C | see Hibler, MWR, 108, 1943-1973, 1980 |
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C | If SEAICE_EXTERNAL_FLUXES is defined this routine simply |
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C | copies the global fields to the seaice-local fields. |
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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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#ifndef SEAICE_EXTERNAL_FLUXES |
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# include "PARAMS.h" |
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# include "GRID.h" |
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# include "SEAICE_SIZE.h" |
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# include "SEAICE_PARAMS.h" |
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# ifdef ALLOW_EXF |
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# include "EXF_OPTIONS.h" |
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# include "EXF_FIELDS.h" |
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# endif |
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#endif |
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C === Routine arguments === |
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C INPUT: |
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C UG :: thermal wind of atmosphere |
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C TSURF :: ocean surface temperature in Kelvin |
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C bi,bj :: loop indices |
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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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C netHeatFlux :: net surface heat flux over open water or under ice |
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C SWHeatFlux :: short wave heat flux over open water or under ice |
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_RL UG (1:sNx,1:sNy) |
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_RL TSURF (1:sNx,1:sNy) |
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_RL netHeatFlux(1:sNx,1:sNy) |
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_RL SWHeatFlux (1:sNx,1:sNy) |
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_RL myTime |
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INTEGER bi, bj, myIter, myThid |
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CEndOfInterface |
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C === Local variables === |
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C i,j - Loop counters |
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INTEGER i, j |
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#ifndef SEAICE_EXTERNAL_FLUXES |
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_RL QS1, D1, D1W, D3, TMELT |
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C local copies of global variables |
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_RL tsurfLoc (1:sNx,1:sNy) |
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_RL atempLoc (1:sNx,1:sNy) |
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_RL lwdownLoc (1:sNx,1:sNy) |
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C auxiliary variable |
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_RL ssq, sstdegC |
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_RL recip_rhoConstFresh, recip_lhEvap |
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C NOW DEFINE ASSORTED CONSTANTS |
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C SATURATION VAPOR PRESSURE CONSTANT |
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QS1=0.622 _d 0/1013.0 _d 0 |
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C SENSIBLE HEAT CONSTANT |
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D1=SEAICE_dalton*SEAICE_cpAir*SEAICE_rhoAir |
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C WATER LATENT HEAT CONSTANT |
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D1W=SEAICE_dalton*SEAICE_lhEvap*SEAICE_rhoAir |
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C STEFAN BOLTZMAN CONSTANT TIMES EMISSIVITY |
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D3=SEAICE_emissivity*SEAICE_boltzmann |
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C MELTING TEMPERATURE OF ICE |
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TMELT = celsius2K |
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C |
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recip_lhEvap = 1./SEAICE_lhEvap |
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recip_rhoConstFresh = 1./rhoConstFresh |
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DO J=1,sNy |
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DO I=1,sNx |
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netHeatFlux(I,J) = 0. _d 0 |
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SWHeatFlux (I,J) = 0. _d 0 |
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C |
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C MAX_TICE does not exist anly longer, lets see if it works without |
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C tsurfLoc (I,J) = MIN(celsius2K+MAX_TICE,TSURF(I,J)) |
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tsurfLoc (I,J) = TSURF(I,J) |
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# ifdef ALLOW_ATM_TEMP |
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C Is this necessary? |
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atempLoc (I,J) = MAX(celsius2K+MIN_ATEMP,ATEMP(I,J,bi,bj)) |
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# endif |
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# ifdef ALLOW_DOWNWARD_RADIATION |
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lwdownLoc(I,J) = MAX(MIN_LWDOWN,LWDOWN(I,J,bi,bj)) |
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# endif |
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ENDDO |
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ENDDO |
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#endif /* SEAICE_EXTERNAL_FLUXES */ |
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C NOW DETERMINE OPEN WATER HEAT BUD. ASSUMING TSURF=WATER TEMP. |
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C WATER ALBEDO IS ASSUMED TO BE THE CONSTANT SEAICE_waterAlbedo |
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DO J=1,sNy |
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DO I=1,sNx |
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#ifdef SEAICE_EXTERNAL_FLUXES |
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netHeatFlux(I,J) = Qnet(I,J,bi,bj) |
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SWHeatFlux (I,J) = Qsw(I,J,bi,bj) |
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#else /* SEAICE_EXTERNAL_FLUXES undefined */ |
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C This is an example of how one could implement surface fluxes |
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C over the ocean (if one dislikes the fluxes computed in pkg/exf). |
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C In this example, the exf-fields are re-used so that they no longer |
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C have the same values as at the time when they are saved for |
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C diagnostics (e.g., hl, hs, lwflux, sflux). To properly |
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C diagnose them, one has to save them again as different (SI-)fields. |
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# ifdef ALLOW_DOWNWARD_RADIATION |
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C net upward short wave heat flux |
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SWHeatFlux(I,J) = (SEAICE_waterAlbedo - 1. _d 0) |
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& *swdown(I,J,bi,bj) |
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C lwup = emissivity*stefanBoltzmann*Tsrf^4 + (1-emissivity)*lwdown |
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C the second terms is the reflected incoming long wave radiation |
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C so that the net upward long wave heat flux is: |
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lwflux(I,J,bi,bj) = - lwdownLoc(I,J)*SEAICE_emissivity |
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& + D3*tsurfLoc(I,J)**4 |
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sstdegC = tsurfLoc(I,J) - TMELT |
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C downward sensible heat |
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hs(I,J,bi,bj) = D1*UG(I,J)*(atempLoc(I,J)-tsurfLoc(I,J)) |
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C saturation humidity |
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ssq = QS1*6.11 _d 0 *EXP( 17.2694 _d 0 |
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& *sstdegC/(sstdegC+237.3 _d 0) ) |
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C downward latent heat |
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hl(I,J,bi,bj) = D1W*UG(I,J)*(AQH(I,J,bi,bj)-ssq) |
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C net heat is positive upward |
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netHeatFlux(I,J)=SWHeatFlux(I,J) |
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& + lwflux(I,J,bi,bj) |
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& - hs(I,J,bi,bj) - hl(I,J,bi,bj) |
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C compute evaporation here again because latent heat is different |
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C from its previous value |
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evap(i,j,bi,bj) = -hl(I,J,bi,bj) |
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& *recip_lhEvap*recip_rhoConstFresh |
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C Salt flux from Precipitation and Evaporation. |
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sflux(i,j,bi,bj) = evap(i,j,bi,bj) - precip(i,j,bi,bj) |
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# ifdef ALLOW_RUNOFF |
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sflux(i,j,bi,bj) = sflux(i,j,bi,bj) - runoff(i,j,bi,bj) |
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# endif |
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sflux(i,j,bi,bj) = sflux(i,j,bi,bj)*maskC(i,j,1,bi,bj) |
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empmr(i,j,bi,bj) = sflux(i,j,bi,bj)*rhoConstFresh |
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# endif /* ALLOW_DOWNWARD_RADIATION */ |
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#endif /* SEAICE_EXTERNAL_FLUXES */ |
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ENDDO |
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ENDDO |
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RETURN |
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END |
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