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C $Header: /u/gcmpack/MITgcm/pkg/aim_v23/phy_lscond.F,v 1.1 2002/11/22 17:17:03 jmc Exp $ |
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C $Name: $ |
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#include "AIM_OPTIONS.h" |
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|
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SUBROUTINE LSCOND (PSA,dpFac,QA,QSAT, |
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O PRECLS,DTLSC,DQLSC, |
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I kGrd,bi,bj,myThid) |
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C-- |
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C-- SUBROUTINE LSCOND (PSA,QA,QSAT, |
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C-- * PRECLS,DTLSC,DQLSC) |
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C-- |
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C-- Purpose: Compute large-scale precipitation and |
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C-- associated tendencies of temperature and moisture |
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C-- Input: PSA = norm. surface pressure [p/p0] (2-dim) |
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C dpFac = cell delta_P fraction (3-dim) |
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C-- QA = specific humidity [g/kg] (3-dim) |
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C-- QSAT = saturation spec. hum. [g/kg] (3-dim) |
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C-- Output: PRECLS = large-scale precipitation [g/(m^2 s)] (2-dim) |
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C-- DTLSC = temperature tendency from l.s. cond (3-dim) |
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C-- DQLSC = hum. tendency [g/(kg s)] from l.s. cond (3-dim) |
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C Input: kGrd = Ground level index (2-dim) |
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C bi,bj = tile index |
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C myThid = Thread number for this instance of the routine |
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C-- |
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IMPLICIT NONE |
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C Resolution parameters |
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|
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C-- size for MITgcm & Physics package : |
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#include "AIM_SIZE.h" |
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#include "EEPARAMS.h" |
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C Physical constants + functions of sigma and latitude |
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#include "com_physcon.h" |
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C Large-scale condensation constants |
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#include "com_lsccon.h" |
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|
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C-- Routine arguments: |
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_RL PSA(NGP), dpFac(NGP,NLEV), QA(NGP,NLEV), QSAT(NGP,NLEV) |
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_RL PRECLS(NGP), DTLSC(NGP,NLEV), DQLSC(NGP,NLEV) |
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INTEGER kGrd(NGP) |
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INTEGER bi,bj,myThid |
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|
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#ifdef ALLOW_AIM |
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|
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C-- Local variables: |
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INTEGER J, K |
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_RL PSA2(NGP) |
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|
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C- jmc: declare all local variables: |
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_RL RTLSC, TFACT, PRG |
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_RL SIG2, RHREF, DQMAX, PFACT |
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C---+----1----+----2----+----3----+----4----+----5----+----6----+----7-|--+----| |
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|
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C-- 1. Initialization |
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|
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c_FM QSMAX = 50. |
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|
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RTLSC = 1./(TRLSC*3600.) |
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TFACT = ALHC/CP |
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PRG = P0/GG |
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|
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DO J=1,NGP |
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DTLSC(J,1) = 0. |
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DQLSC(J,1) = 0. |
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PRECLS(J) = 0. |
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PSA2(J) = PSA(J)*PSA(J) |
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ENDDO |
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|
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C-- 2. Tendencies of temperature and moisture |
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C NB. A maximum heating rate is imposed to avoid |
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C grid-point-storm instability |
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|
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DO K=2,NLEV |
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SIG2=SIG(K)*SIG(K) |
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c_FM RHREF = RHLSC+DRHLSC*(SIG2-1.) |
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c_FM DQMAX = (1.1-RHREF)*QSMAX*SIG2*RTLSC |
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DO J=1,NGP |
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RHREF = RHLSC+DRHLSC*(SIG2/PSA2(J) - 1. _d 0) |
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DQMAX = (1.1 _d 0-RHREF)*QSMAX*SIG2*RTLSC |
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DQLSC(J,K) = MIN(0. _d 0,(RHREF*QSAT(J,K)-QA(J,K)))*RTLSC |
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c_FM DTLSC(J,K) = TFACT*MIN(-DQLSC(J,K),DQMAX*PSA2(J)) |
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c DTLSC(J,K) = TFACT*MIN(-DQLSC(J,K),DQMAX) |
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C-jmc: the threshold on latent heat (above) breaks the energy conservation; |
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C to fix this, apply the threshold directly to the condensation |
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DQLSC(J,K) = MAX(-DQMAX, DQLSC(J,K) ) |
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DTLSC(J,K) = -TFACT*DQLSC(J,K) |
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ENDDO |
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ENDDO |
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|
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C-- 3. Large-scale precipitation |
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|
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DO J=1,NGP |
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DO K=2,kGrd(J) |
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PFACT = DSIG(K)*PRG*dpFac(J,K) |
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PRECLS(J) = PRECLS(J)-PFACT*DQLSC(J,K) |
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ENDDO |
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ENDDO |
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|
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c_FM DO J=1,NGP |
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c_FM PRECLS(J) = PRECLS(J)*PSA(J) |
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c_FM ENDDO |
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C-- |
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#endif /* ALLOW_AIM */ |
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|
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RETURN |
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END |
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