!-------------------------------------- LICENCE BEGIN ------------------------------------
!Environment Canada - Atmospheric Science and Technology License/Disclaimer,
! version 3; Last Modified: May 7, 2008.
!This is free but copyrighted software; you can use/redistribute/modify it under the terms
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!See the above mentioned License/Disclaimer for more details.
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***S/R MHRAHU - PASSAGE DE HR A HU
*
#include "phy_macros_f.h"
SUBROUTINE MHRAHU(HU,HR,TX,PX,LNPS,MODP,SWTT,SWPH, 2,8
$ NI,NK,N)
#include "impnone.cdk"
*
INTEGER NI, NK, N, MODP
REAL HU(NI,NK), HR(NI,NK), TX(NI,NK)
REAL PX(NK), LNPS(NI,*)
*
LOGICAL SWTT, SWPH
*
*Author
* N. Brunet (Jan91)
*
*Revision
* 001 B. Bilodeau (August 1991)- Adaptation to UNIX
* 002 N. Brunet (May 1994) - Improved iteration for tx=tv
* 003 B. Bilodeau (January 2001) - Automatic arrays
*
*Object
* to calculate the specific humidity from relative humidity,
* temperature and pressure
*
*Arguments
*
* - Output -
* HU specific humidity in kg/kg
*
* - Input -
* HR relative humidity in fraction
* TX temperature or virtual temperature in Kelvins
* PX see MODP
* LNPS see MODP
* MODP pressure mode (SI units only):
* =0; pressure level in PX
* =1; sigma level in PX and PS(surface pressure) in LNPS
* =2; sigma level in PX and logarithm of sigma level in
* LNPS
* =3; all points of pressure in LNPS(NI,*) in Pascals
* =4; sigma level in PX and logarithm of sigma level in
* LNPS(in millibars unless using SI units)
* =5; logarithm of pressure level in PX(in millibars unless
* using SI units)
* SWTT .TRUE. to pass TT for argument
* .FALSE. to pass TV for argument
* SWPH .TRUE. to consider water and ice phase
* .FALSE. to consider water phase only
* NI horizontal dimension
* NK vertical dimension
* N number of treated points
*
*
*IMPLICITES
#include "consphy.cdk"
*MODULES
EXTERNAL INCTPHY
*
**
*--------------------------------------------------------------------
*
************************************************************************
* AUTOMATIC ARRAYS
************************************************************************
*
AUTOMATIC ( PN , REAL , (N) )
*
************************************************************************
*
REAL E
REAL TP, TG, HUS
REAL EPSIL
INTEGER K, I, ITER, NITER
*
#include "dintern.cdk"
#include "fintern.cdk"
*--------------------------------------------------------------------
#include "initcph.cdk"
*
*
*
NITER = 25
EPSIL = 0.001
*
DO 10 K=1,NK
*
#include "modpr2.cdk"
*
DO 100 I=1,N
TP = TX(I,K)
IF(SWPH)THEN
E = DMIN1(DBLE(PN(I)),HR(I,K)*FOEW(TP))
ELSE
E = DMIN1(DBLE(PN(I)),HR(I,K)*FOEWA(TP))
END IF
HUS = FOQFE(E,PN(I))
TP = FOTTV(TX(I,K),HUS)
IF(SWTT)THEN
HU(I,K) = HUS
GO TO 100
END IF
TG = 0.5*(TX(I,K)+TP)
*
DO 200 ITER=1,NITER
IF(SWPH)THEN
E = DMIN1(DBLE(PN(I)),HR(I,K)*FOEW(TG))
ELSE
E = DMIN1(DBLE(PN(I)),HR(I,K)*FOEWA(TG))
END IF
HUS = FOQFE(E,PN(I))
TP = FOTTV(TX(I,K),HUS)
IF(ABS(TP-TG) .LT. EPSIL)THEN
HU(I,K) = HUS
GO TO 100
END IF
TG = 0.5 * (TG + TP)
200 CONTINUE
*
HU(I,K) = HUS
*
100 CONTINUE
10 CONTINUE
*
*
RETURN
CONTAINS
#include "fintern90.cdk"
END