!-------------------------------------- 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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!
!This software is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; 
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!See the above mentioned License/Disclaimer for more details.
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!-------------------------------------- LICENCE END --------------------------------------
***FONCTION SHRAES  -  PASSAGE DE HR A ES
*

      FUNCTION SHRAES(HR,TX,PX,LNPS,MODP,SWTT,SWPH),2
*
#include "impnone.cdk"
      REAL SHRAES, HR, TX, PX, LNPS
      INTEGER MODP
      LOGICAL SWTT, SWPH
*
*Author
*          N. Brunet  (Jan91)
*
*Object
*          to return the dew point depression(Celsius) calculated
*          from relative humidity, temperature and pressure
*
*Arguments
*
*          - Input -
* HR       relative humidity (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
*
*
*IMPLICITES
#include "consphy.cdk"
*MODULES
      EXTERNAL INCTPHY, SHRAHU, SHUAES
*
**
*--------------------------------------------------------------------
      REAL HUS
*
      REAL SHRAHU, SHUAES
#include "dintern.cdk"
#include "fintern.cdk"
*--------------------------------------------------------------------
#include "initcph.cdk"
*
      HUS = SHRAHU(HR,TX,PX,LNPS,MODP,SWTT,SWPH)
      SHRAES = SHUAES(HUS,TX,PX,LNPS,MODP,SWTT,SWPH)
*
      RETURN
      CONTAINS
#include "fintern90.cdk"
      END