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adcroft |
1.5 |
C $Header: /u/gcmpack/models/MITgcmUV/model/src/find_rho.F,v 1.4 1998/04/29 21:30:18 adcroft Exp $ |
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cnh |
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#include "CPP_EEOPTIONS.h" |
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adcroft |
1.5 |
#define USE_FACTORIZED_POLY |
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cnh |
1.1 |
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! ============================================================================== |
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adcroft |
1.4 |
subroutine FIND_RHO( |
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I bi, bj, iMin, iMax, jMin, jMax, k, kRef, eqn, |
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O rholoc, |
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I myThid ) |
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C /==========================================================\ |
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C | o SUBROUTINE FIND_RHO | |
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C | Calculates [rho(S,T,z)-Rhonil] of a slice | |
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C |==========================================================| |
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C | | |
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C | k - is the Theta/Salt level | |
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C | kRef - determines pressure reference level | |
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C | (not used in 'LINEAR' mode) | |
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C | eqn - determines the eqn. of state: 'LINEAR' or 'POLY3' | |
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C | | |
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C \==========================================================/ |
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cnh |
1.1 |
implicit none |
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! Common |
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#include "SIZE.h" |
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#include "DYNVARS.h" |
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#include "PARAMS.h" |
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adcroft |
1.4 |
! Arguments |
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integer bi,bj,iMin,iMax,jMin,jMax |
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integer k ! Level of Theta/Salt slice |
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integer kRef ! Pressure reference level |
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character*(*) eqn |
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_RL rholoc(1-Olx:sNx+Olx,1-Oly:sNy+Oly) |
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integer myThid |
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cnh |
1.1 |
! Local |
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adcroft |
1.4 |
integer i,j |
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_RL refTemp,refSalt,sigRef,tP,sP,deltaSig |
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cnh |
1.1 |
! ------------------------------------------------------------------------------ |
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adcroft |
1.4 |
if (eqn.eq.'LINEAR') then |
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C ***NOTE*** |
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C In the linear EOS, to make the static stability calculation meaningful |
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C we alway calculate the perturbation with respect to the surface level. |
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C ********** |
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refTemp=tRef(1) |
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refSalt=sRef(1) |
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cnh |
1.1 |
do j=jMin,jMax |
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do i=iMin,iMax |
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adcroft |
1.4 |
rholoc(i,j)=rhonil*( |
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& sBeta*( salt(i,j,k,bi,bj)-refSalt) |
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& -tAlpha*(theta(i,j,k,bi,bj)-refTemp) ) |
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cnh |
1.1 |
enddo |
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enddo |
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adcroft |
1.4 |
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elseif (eqn.eq.'POLY3') then |
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refTemp=eosRefT(kRef) |
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refSalt=eosRefS(kRef) |
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adcroft |
1.5 |
sigRef=eosSig0(kRef) + (1000.-Rhonil) |
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adcroft |
1.4 |
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do j=jMin,jMax |
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do i=iMin,iMax |
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tP=theta(i,j,k,bi,bj)-refTemp |
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sP=salt(i,j,k,bi,bj)-refSalt |
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adcroft |
1.5 |
#ifdef USE_FACTORIZED_POLY |
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adcroft |
1.4 |
deltaSig= |
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adcroft |
1.5 |
& (( eosC(9,kRef)*sP + eosC(5,kRef) )*sP + eosC(2,kRef) )*sP |
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& + ( ( eosC(6,kRef) |
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& *tP |
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& +eosC(7,kRef)*sP + eosC(3,kRef) |
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& )*tP |
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& +(eosC(8,kRef)*sP + eosC(4,kRef) )*sP + eosC(1,kRef) |
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& )*tP |
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#else |
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deltaSig= |
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& eosC(1,kRef)*tP |
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& +eosC(2,kRef) *sP |
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& +eosC(3,kRef)*tP*tP |
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& +eosC(4,kRef)*tP *sP |
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& +eosC(5,kRef) *sP*sP |
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& +eosC(6,kRef)*tP*tP*tP |
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& +eosC(7,kRef)*tP*tP *sP |
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& +eosC(8,kRef)*tP *sP*sP |
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& +eosC(9,kRef) *sP*sP*sP |
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#endif |
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rholoc(i,j)=sigRef+deltaSig |
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adcroft |
1.4 |
enddo |
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enddo |
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else |
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write(0,*) 'FIND_RHO: eqn = ',eqn |
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stop 'FIND_RHO: argument "eqn" has illegal value' |
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endif |
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cnh |
1.1 |
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! ------------------------------------------------------------------------------ |
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return |
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end |
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! ============================================================================== |
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