!copyright (C) 2001  MSC-RPN COMM  %%%RPNPHY%%%
***S/R MFOQSA  -  CALCULE HUM SP SATURANTE,(EAU SEULEMENT)
*
#include "phy_macros_f.h"

      SUBROUTINE MFOQSA(QS,TT,PX,LNPS,MODP,NI,NK,N) 12
*
#include "impnone.cdk"
*
      INTEGER NI, NK, N, MODP
      REAL QS(NI,NK), TT(NI,NK)
      REAL PX(*), LNPS(NI,*)
      REAL TEMP1
*
*Author
*          N. Brunet  (Jan91)
*
*Revision
* 001      B. Bilodeau  (August 1991)- Adaptation to UNIX
* 002      B. Bilodeau (January 2001) - Automatic arrays
* 003      G. Pellerin (Mai 03) - IBM conversion
*                  - calls to vexp routine (from massvp4 library)
*
*Object
*          to calculate saturation specific humidity (water phase
*          considered only for all temperatures)
*
*Arguments
*
*          - Output -
* QS       saturated specific humidity in kg/kg
*
*          - Input -
* TT       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)
* NI       horizontal dimension
* NK       vertical dimension
* N        number of points to process
*
*
*IMPLICITES
#include "consphy.cdk"
*MODULES
      EXTERNAL INCTPHY
*
**
*--------------------------------------------------------------------
      INTEGER K, I
      REAL*8 DEPS1,DEPS2,DTRPL,DTEMP
*
************************************************************************
*     AUTOMATIC ARRAYS
************************************************************************
*
      AUTOMATIC ( PN , REAL   , (N     ) )
      AUTOMATIC ( XT , REAL*8 , (NI, NK) )
*
************************************************************************
*
#include "initcph.cdk"
*
      DTRPL=DBLE(TRPL)
      DEPS1=DBLE(EPS1)
      DEPS2=DBLE(EPS2)
*
      DO K=1,NK
         DO I=1,NI
         DTEMP=DBLE(TT(I,K))
         XT(I,K)= 17.269D0 * (DTEMP-DTRPL)/(DTEMP-35.86D0)
         ENDDO
      ENDDO
*
      CALL VEXP(XT,XT,NI*NK)

      DO 10 K=1,NK
*
#include "modpr2.cdk"
*
      DO 15 I=1,N
         DTEMP = DBLE(PN(I))
         QS(I,K) = DEPS1/(DMAX1(1.0D0,DTEMP/
     *                    (610.78D0*XT(I,K)))-DEPS2)
15    CONTINUE
10    CONTINUE
*
*
      RETURN
      END