!-------------------------------------- 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 
!of the Environment Canada - Atmospheric Science and Technology License/Disclaimer 
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***S/R MHUAHR  -  PASSAGE DE HU A HR
*
#include "phy_macros_f.h"

      SUBROUTINE MHUAHR(HR,HU,TX,PX,LNPS,MODP,SWTT,SWPH, 1,7
     $                  NI,NK,N)
#include "impnone.cdk"
*
      INTEGER NI, NK, N, MODP
      REAL HR(NI,NK), HU(NI,NK), TX(NI,NK)
      REAL PX(NK), LNPS(NI,*)
      REAL TEMP1, TEMP2
*
*
      LOGICAL SWTT, SWPH
*
*Author
*          N. Brunet  (Jan91)
*
*Revision
* 001      B. Bilodeau  (August 1991)- Adaptation to UNIX
* 002      B. Bilodeau (January 2001) - Automatic arrays
*
*Object
*          to calculate relative humidity from specific humidity,
*          temperature and pressure
*
*Arguments
*
*          - Output -
* HR       relative humidity in fraction
*
*          - Input -
* HU       specific humidity in kg/kg
* 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) )
      AUTOMATIC ( TP , REAL , (N) )
*
************************************************************************
*
      INTEGER I, K
*
#include "dintern.cdk"
#include "fintern.cdk"
*--------------------------------------------------------------------
#include "initcph.cdk"
*
*
      DO 10 K=1,NK
*
#include "modpr2.cdk"
*
         IF(SWTT)THEN
            DO 100 I=1,NTP(I) = TX(I,K)
         ELSE
            DO 105 I=1,NTP(I) = FOTTV(TX(I,K),HU(I,K))
         END IF
*
         DO 200 I=1,N
            IF(SWPH)THEN
               TEMP1   = TP(I)
               TEMP2   = PN(I)
               HR(I,K) = FOHR(HU(I,K),TEMP1,TEMP2)
            ELSE
               TEMP1   = TP(I)
               TEMP2   = PN(I)
               HR(I,K) = FOHRA(HU(I,K),TEMP1,TEMP2)
            END IF
200      CONTINUE
*
10    CONTINUE
*
*
      RETURN
      CONTAINS
#include "fintern90.cdk"
      END