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!Environment Canada - Atmospheric Science and Technology License/Disclaimer,
!                     version 3; Last Modified: May 7, 2008.
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!

      SUBROUTINE SUMASKLAT 2,8
#if defined (DOC)
*
***s/r SUMASKLAT  - Set-up mask used when computing statistics only over
*                   a restricted latitude band as specified by namelist
*                   variable NREGION
*
*Author  : M. Buehner 2007
*Revision:
*
*    -------------------
**    Purpose:
*     .
*Arguments
#endif
      IMPLICIT NONE
*implicits
#include "comdim.cdk"
#include "comlun.cdk"
#include "comcva.cdk"
#include "comcse1.cdk"
#include "comcst.cdk"
C
      integer jj,klat1,klat2,klat3,klat4,ISRCHILA
c
      klat1=0
      klat2=0
      klat3=0
      klat4=0

      if(nregion.eq.0) then
c GLOBAL
        do jj=1,nj
          masklat(jj)=1.0d0
        enddo
      elseif(nregion.eq.1) then
c NH
        klat1=ISRCHILA(35.0*rpi/180.0)-1
        klat2=ISRCHILA(10.0*rpi/180.0)-1
        do jj=1,(klat1-1)
          masklat(jj)=1.0d0
        enddo
        do jj=klat1,klat2
          masklat(jj)=dble(klat2-jj+1)/dble(klat2-klat1+2)
        enddo
        do jj=(klat2+1),nj
          masklat(jj)=0.0d0
        enddo
      elseif(nregion.eq.2) then
c TR
        klat1=ISRCHILA(35.0*rpi/180.0)-1
        klat2=ISRCHILA(10.0*rpi/180.0)-1
        klat3=ISRCHILA(-10.0*rpi/180.0)-1
        klat4=ISRCHILA(-35.0*rpi/180.0)-1
        do jj=1,(klat1-1)
          masklat(jj)=0.0d0
        enddo
        do jj=klat1,klat2
          masklat(jj)=dble(jj-klat1+1)/dble(klat2-klat1+2)
        enddo
        do jj=(klat2+1),(klat3-1)
          masklat(jj)=1.0d0
        enddo
        do jj=klat3,klat4
          masklat(jj)=dble(klat4-jj+1)/dble(klat4-klat3+2)
        enddo
        do jj=(klat4+1),nj
          masklat(jj)=0.0d0
        enddo
      elseif(nregion.eq.3) then
c SH
        klat3=ISRCHILA(-10.0*rpi/180.0)-1
        klat4=ISRCHILA(-35.0*rpi/180.0)-1
        do jj=1,(klat3-1)
          masklat(jj)=0.0d0
        enddo
        do jj=klat3,klat4
          masklat(jj)=dble(jj-klat3+1)/dble(klat4-klat3+2)
        enddo
        do jj=(klat4+1),nj
          masklat(jj)=1.0d0
        enddo
      endif

      write(nulout,*) 'SUMASKLAT: NREGION=',nregion
      write(nulout,*) 'SUMASKLAT: KLAT=',klat1,klat2,klat3,klat4
      write(nulout,*) 'SUMASKLAT: MASKLAT=',masklat

      RETURN
      END