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C $Header: $ |
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C $Name: $ |
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|
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#include "AIM_OPTIONS.h" |
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|
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CBOP |
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C !ROUTINE: SNOW_PRECIP |
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C !INTERFACE: |
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SUBROUTINE SNOW_PRECIP ( |
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I PSA, dpFac, ThA, |
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I IDEPTH,PRECNV,DQCNV,PRECLS,DQLSC, |
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U DTCNV,DTLSC, |
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O EnPrec, |
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I kGrd,bi,bj,myThid) |
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|
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C !DESCRIPTION: \bv |
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C *==========================================================* |
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C | S/R SNOW_PRECIP |
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C | o Diagnose snow precipitation according to near surface |
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C | air temperature. |
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C *==========================================================* |
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C | Correct condensation heating for energy (rain Temp, snow) |
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C | of precipication (L.S. cond & convect. precip) |
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C *==========================================================* |
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C \ev |
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|
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C !USES: |
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IMPLICIT NONE |
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|
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C == Global variables === |
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|
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C Resolution parameters |
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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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|
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C Physical constants + functions of sigma and latitude |
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#include "com_physcon.h" |
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|
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C == Routine Arguments == |
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C !INPUT PARAMETERS: |
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C 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 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 ThA :: Pot.temperature [K] (3-dim) |
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C IDEPTH :: convection depth in layers (2-dim) |
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C PRECNV :: convective precipitation [g/(m^2 s)] (2-dim) |
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C DQCNV :: hum. tendency [g/(kg s)] from convection (3-dim) |
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C PRECLS :: large-scale precipitation [g/(m^2 s)] (2-dim) |
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C DQLSC :: hum. tendency [g/(kg s)] from l.s. cond (3-dim) |
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C !MODIFIED PARAMETERS: |
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C DTCNV :: temperature tendency from convection (3-dim) |
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C DTLSC :: temperature tendency from l.s. cond (3-dim) |
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C !OUTPUT PARAMETERS: |
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C EnPrec :: energy of precipitation (snow, rain temp) [J/g] |
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C-- |
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_RL PSA(NGP), dpFac(NGP,NLEV), ThA(NGP,NLEV) |
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_RL PRECLS(NGP), DTLSC(NGP,NLEV), DQLSC(NGP,NLEV) |
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_RL PRECNV(NGP), DTCNV(NGP,NLEV), DQCNV(NGP,NLEV) |
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_RL EnPrec(NGP) |
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INTEGER IDEPTH(NGP) |
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INTEGER kGrd(NGP) |
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INTEGER bi,bj,myThid |
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CEOP |
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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, Ktop |
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_RL kappa |
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_RL T1(NGP) |
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|
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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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kappa = RD/CP |
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|
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C-- 2. Compute energy of precip, based on near-surface Air temperature: |
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C note: EnPrec units are J/g since precip is in g/m2 and spec.hum. in g/Kg |
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DO J=1,NGP |
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IF ( kGrd(J).NE.0 ) THEN |
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T1(J) = ThA(J,kGrd(J))*(PSA(J)**kappa) |
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IF ( T1(J) .GE. tFreeze ) THEN |
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EnPrec(J) = rainCP*(T1(J)-tFreeze) |
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ELSE |
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EnPrec(J) = -ALHF |
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ENDIF |
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ELSE |
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EnPrec(J) = 0. |
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ENDIF |
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ENDDO |
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|
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C-- 3. Large-scale precipitation: correct condensation Heating |
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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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DTLSC(J,K) = DTLSC(J,K) + EnPrec(J)*DQLSC(J,K)/CP |
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ENDDO |
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ENDDO |
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|
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C-- 4. Convective precipitation: correct condensation Heating |
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|
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DO J=1,NGP |
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IF (kGrd(J).NE.0 .AND. IDEPTH(J).NE.0 ) THEN |
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Ktop = kGrd(J) - IDEPTH(J) |
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DTCNV(J,Ktop) = DTCNV(J,Ktop) |
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& - EnPrec(J)*PRECNV(J)*GRDSCP(Ktop) |
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ENDIF |
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ENDDO |
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|
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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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