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C $Header: /u/gcmpack/MITgcm/pkg/bulk_force/bulkf_forcing.F,v 1.13 2009/04/28 18:08:13 jmc Exp $ |
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C $Name: $ |
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|
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#include "BULK_FORCE_OPTIONS.h" |
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|
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CBOP |
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C !ROUTINE: BULKF_FORCING |
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C !INTERFACE: |
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SUBROUTINE BULKF_FORCING( |
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I myTime, myIter, myThid ) |
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|
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C !DESCRIPTION: \bv |
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C *==========================================================* |
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C | SUBROUTINE BULKF_FORCING |
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C *==========================================================* |
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C \ev |
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|
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C o Get the surface fluxes used to force ocean model |
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C Output: |
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C ------ |
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C ustress, vstress :: wind stress |
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C qnet :: net heat flux |
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C empmr :: freshwater flux |
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C --------- |
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C |
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C Input: |
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C ------ |
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C uwind, vwind :: mean wind speed (m/s) at height hu (m) |
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C Tair :: mean air temperature (K) at height ht (m) |
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C Qair :: mean air humidity (kg/kg) at height hq (m) |
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C theta(k=1) :: sea surface temperature (K) |
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C rain :: precipitation |
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C runoff :: river(ice) runoff |
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C |
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C ================================================================== |
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C SUBROUTINE bulkf_forcing |
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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 "EEPARAMS.h" |
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#include "SIZE.h" |
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#include "PARAMS.h" |
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#include "DYNVARS.h" |
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#include "GRID.h" |
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#include "FFIELDS.h" |
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#include "BULKF_PARAMS.h" |
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#include "BULKF.h" |
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#include "BULKF_INT.h" |
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#include "BULKF_TAVE.h" |
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|
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C !INPUT/OUTPUT PARAMETERS: |
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C == routine arguments == |
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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_BULK_FORCE |
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C == Local variables == |
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INTEGER bi,bj |
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INTEGER i,j |
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INTEGER ks, iceornot |
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|
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_RL df0dT, hfl, evp, dEvdT |
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#ifdef ALLOW_FORMULA_AIM |
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_RL SHF(1), EVPloc(1), SLRU(1) |
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_RL dEvp(1), sFlx(0:2) |
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#endif |
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|
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C- surface level index: |
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ks = 1 |
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|
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C- Compute surface fluxes over ice-free ocean only: |
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iceornot = 0 |
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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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DO j = 1-OLy,sNy+OLy |
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DO i = 1-OLx,sNx+OLx |
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IF ( maskC(i,j,ks,bi,bj).NE.0. _d 0 ) THEN |
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|
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#ifdef ALLOW_FORMULA_AIM |
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IF ( useFluxFormula_AIM ) THEN |
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CALL BULKF_FORMULA_AIM( |
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I theta(i,j,ks,bi,bj), flwdwn(i,j,bi,bj), |
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I thAir(i,j,bi,bj), Tair(i,j,bi,bj), |
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I Qair(i,j,bi,bj), wspeed(i,j,bi,bj), |
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O SHF, EVPloc, SLRU, |
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O dEvp, sFlx, |
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I iceornot, myThid ) |
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|
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flwup(i,j,bi,bj)= ocean_emissivity*SLRU(1) |
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C- reverse sign (AIM convention -> BULKF convention): |
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fsh(i,j,bi,bj) = -SHF(1) |
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flh(i,j,bi,bj) = -Lvap*EVPloc(1) |
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C- Convert from g/m2/s to m/s |
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evap(i,j,bi,bj) = EVPloc(1) * 1. _d -3 / rhoFW |
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dEvdT = dEvp(1) * 1. _d -3 |
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df0dT = sFlx(2) |
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|
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ELSEIF ( blk_nIter.EQ.0 ) THEN |
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#else /* ALLOW_FORMULA_AIM */ |
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IF ( blk_nIter.EQ.0 ) THEN |
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#endif /* ALLOW_FORMULA_AIM */ |
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CALL BULKF_FORMULA_LANL( |
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I uwind(i,j,bi,bj),vwind(i,j,bi,bj),wspeed(i,j,bi,bj), |
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I Tair(i,j,bi,bj), Qair(i,j,bi,bj), |
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I cloud(i,j,bi,bj),theta(i,j,ks,bi,bj), |
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O flwup(i,j,bi,bj), flh(i,j,bi,bj), |
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O fsh(i,j,bi,bj), df0dT, |
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O ustress(i,j,bi,bj), vstress(i,j,bi,bj), |
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O evp, savssq(i,j,bi,bj), dEvdT, |
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I iceornot, myThid ) |
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C Note that the LANL flux conventions are opposite |
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C of what they are in the model. |
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|
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C- Convert from kg/m2/s to m/s |
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evap(i,j,bi,bj) = evp/rhoFW |
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|
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ELSE |
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CALL BULKF_FORMULA_LAY( |
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I uwind(i,j,bi,bj), vwind(i,j,bi,bj), |
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I wspeed(i,j,bi,bj), Tair(i,j,bi,bj), |
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I Qair(i,j,bi,bj), theta(i,j,ks,bi,bj), |
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O flwup(i,j,bi,bj), flh(i,j,bi,bj), |
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O fsh(i,j,bi,bj), df0dT, |
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O ustress(i,j,bi,bj), vstress(i,j,bi,bj), |
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O evp, savssq(i,j,bi,bj), dEvdT, |
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I iceornot, i,j,bi,bj,myThid ) |
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|
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C- Convert from kg/m2/s to m/s |
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evap(i,j,bi,bj) = evp/rhoFW |
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|
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ENDIF |
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|
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C- use down long wave data |
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flwupnet(i,j,bi,bj)=flwup(i,j,bi,bj)-flwdwn(i,j,bi,bj) |
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C- using down solar, need to have water albedo -- .1 |
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fswnet(i,j,bi,bj) = solar(i,j,bi,bj) |
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& *( 1. _d 0 - ocean_albedo ) |
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ElSE |
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ustress(i,j,bi,bj) = 0. _d 0 |
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vstress(i,j,bi,bj) = 0. _d 0 |
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fsh(i,j,bi,bj) = 0. _d 0 |
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flh(i,j,bi,bj) = 0. _d 0 |
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flwup(i,j,bi,bj) = 0. _d 0 |
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evap(i,j,bi,bj) = 0. _d 0 |
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fswnet(i,j,bi,bj) = 0. _d 0 |
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savssq(i,j,bi,bj) = 0. _d 0 |
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ENDIF |
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ENDDO |
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ENDDO |
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|
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IF ( calcWindStress ) THEN |
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C- move wind stresses to u and v points |
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DO j = 1-OLy,sNy+OLy |
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DO i = 1-OLx+1,sNx+OLx |
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fu(i,j,bi,bj) = maskW(i,j,1,bi,bj) |
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& *(ustress(i,j,bi,bj)+ustress(i-1,j,bi,bj))*0.5 _d 0 |
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ENDDO |
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ENDDO |
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DO j = 1-OLy+1,sNy+OLy |
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DO i = 1-OLx,sNx+OLx |
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fv(i,j,bi,bj) = maskS(i,j,1,bi,bj) |
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& *(vstress(i,j,bi,bj)+vstress(i,j-1,bi,bj))*0.5 _d 0 |
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ENDDO |
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ENDDO |
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ENDIF |
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|
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C- Add all contributions. |
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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,ks,bi,bj).NE.0. _d 0 ) THEN |
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C- Net downward surface heat flux : |
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hfl = 0. _d 0 |
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hfl = hfl + fsh(i,j,bi,bj) |
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hfl = hfl + flh(i,j,bi,bj) |
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hfl = hfl - flwupnet(i,j,bi,bj) |
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hfl = hfl + fswnet(i,j,bi,bj) |
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C- Heat flux: |
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Qnet(i,j,bi,bj) = -hfl |
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Qsw (i,j,bi,bj) = -fswnet(i,j,bi,bj) |
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#ifdef COUPLE_MODEL |
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dFdT(i,j,bi,bj) = df0dT |
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#endif |
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C- Fresh-water flux from Precipitation and Evaporation. |
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EmPmR(i,j,bi,bj) = (evap(i,j,bi,bj)-rain(i,j,bi,bj) |
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& - runoff(i,j,bi,bj))*rhoConstFresh |
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C---- cheating: now done in S/R BULKF_FLUX_ADJUST, over ice-free ocean only |
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c Qnet(i,j,bi,bj) = Qnetch(i,j,bi,bj) |
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c EmPmR(i,j,bi,bj) = EmPch(i,j,bi,bj) |
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C---- |
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ELSE |
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Qnet(i,j,bi,bj) = 0. _d 0 |
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Qsw (i,j,bi,bj) = 0. _d 0 |
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EmPmR(i,j,bi,bj)= 0. _d 0 |
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#ifdef COUPLE_MODEL |
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dFdT(i,j,bi,bj) = 0. _d 0 |
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#endif |
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ENDIF |
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ENDDO |
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ENDDO |
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|
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IF ( temp_EvPrRn .NE. UNSET_RL ) THEN |
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C-- Account for energy content of Precip + RunOff & Evap. Assumes: |
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C 1) Rain has same temp as Air |
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C 2) Snow has no heat capacity (consistent with seaice & thsice pkgs) |
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C 3) No distinction between sea-water Cp and fresh-water Cp |
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C 4) Run-Off comes at the temp of surface water (with same Cp) |
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C 5) Evap is released to the Atmos @ surf-temp (=SST); should be using |
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C the water-vapor heat capacity here and consistently in Bulk-Formulae; |
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C Could also be put directly into Latent Heat flux. |
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c IF ( SnowFile .NE. ' ' ) THEN |
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C-- Melt snow (if provided) into the ocean and account for rain-temp |
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c DO j = 1-OLy,sNy+OLy |
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c DO i = 1-OLx,sNx+OLx |
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c Qnet(i,j,bi,bj) = Qnet(i,j,bi,bj) |
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c & + Lfresh*snowPrecip(i,j,bi,bj)*rhoConstFresh |
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c & - HeatCapacity_Cp |
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c & *( Tair(i,j,bi,bj) - Tf0kel - temp_EvPrRn ) |
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c & *( rain(i,j,bi,bj)- snowPrecip(i,j,bi,bj) ) |
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c & *rhoConstFresh |
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c ENDDO |
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c ENDDO |
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c ELSE |
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C-- Make snow (according to Air Temp) and melt it in the ocean |
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C note: here we just use the same criteria as over seaice but would be |
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C better to consider a higher altitude air temp, e.g., 850.mb |
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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 ( Tair(i,j,bi,bj).LE.Tf0kel ) THEN |
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Qnet(i,j,bi,bj) = Qnet(i,j,bi,bj) |
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& + Lfresh*rain(i,j,bi,bj)*rhoConstFresh |
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ELSE |
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C-- Account for rain-temp |
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Qnet(i,j,bi,bj) = Qnet(i,j,bi,bj) |
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& - HeatCapacity_Cp |
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& *( Tair(i,j,bi,bj) - Tf0kel - temp_EvPrRn ) |
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& *rain(i,j,bi,bj)*rhoConstFresh |
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ENDIF |
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ENDDO |
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ENDDO |
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c ENDIF |
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C-- Account for energy content of Evap and RunOff: |
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DO j = 1-OLy,sNy+OLy |
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DO i = 1-OLx,sNx+OLx |
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c Qnet(i,j,bi,bj) = Qnet(i,j,bi,bj) |
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c & + ( theta(i,j,ks,bi,bj) - temp_EvPrRn ) |
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c & *( evap(i,j,bi,bj)*cpwv |
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c & - runoff(i,j,bi,bj)*HeatCapacity_Cp |
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c & )*rhoConstFresh |
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Qnet(i,j,bi,bj) = Qnet(i,j,bi,bj) |
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& + ( theta(i,j,ks,bi,bj) - temp_EvPrRn ) |
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& *( evap(i,j,bi,bj) - runoff(i,j,bi,bj) ) |
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& *HeatCapacity_Cp*rhoConstFresh |
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Qnet(i,j,bi,bj) = Qnet(i,j,bi,bj)*maskC(i,j,ks,bi,bj) |
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ENDDO |
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ENDDO |
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ENDIF |
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|
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IF ( blk_taveFreq.GT.0. _d 0 ) |
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& CALL BULKF_AVE( bi, bj, myThid ) |
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|
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C-- end bi,bj loops |
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ENDDO |
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ENDDO |
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|
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C-- Update the tile edges. |
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C jmc: Is it necessary ? |
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c _EXCH_XY_RS(Qnet, myThid) |
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c _EXCH_XY_RS(EmPmR, myThid) |
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c CALL EXCH_UV_XY_RS(fu, fv, .TRUE., myThid) |
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|
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#endif /*ALLOW_BULK_FORCE*/ |
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|
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RETURN |
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END |
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