rrtm_taumol9.F90

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!----------------------------------------------------------------------------
SUBROUTINE rrtm_taumol9 (KLEV,TAU,&
  &tauaerl,fac00,fac01,fac10,fac11,jp,jt,jt1,oneminus,&
  &colh2o,coln2o,colch4,laytrop,layswtch,laylow,selffac,selffrac,indself,pfrac)

!     BAND 9:  1180-1390 cm-1 (low - H2O,CH4; high - CH4)

! Modifications
!
!     D Salmond   2000-05-15 speed-up
!     JJMorcrette 2000-05-17 speed-up


#include "tsmbkind.h"

USE parrrtm  , ONLY : jplay  ,jpband ,jpgpt  ,jpxsec  , ngs8
USE yoerrtwn , ONLY : ng     ,nspa   ,nspb
USE yoerrta9 , ONLY : ng9    ,absa   ,absb   ,fracrefa, fracrefb,&
            &ka      , kb     ,selfref,absn2o  , ch4ref  ,&
            &etaref  , h2oref ,n2oref ,strrat

!  Input
!#include "yoeratm.h"


IMPLICIT NONE

!  Output
real_b :: tau(jpgpt,jplay)

!     DUMMY INTEGER SCALARS
integer_m :: klev

!- from AER
real_b :: tauaerl(jplay,jpband)

!- from INTFAC      
real_b :: fac00(jplay)
real_b :: fac01(jplay)
real_b :: fac10(jplay)
real_b :: fac11(jplay)

!- from INTIND
integer_m :: jp(jplay)
integer_m :: jt(jplay)
integer_m :: jt1(jplay)

!- from PRECISE             
real_b :: oneminus

!- from PROFDATA             
real_b :: colh2o(jplay)
real_b :: coln2o(jplay)
real_b :: colch4(jplay)
integer_m :: laytrop
integer_m :: layswtch
integer_m :: laylow

!- from SELF             
real_b :: selffac(jplay)
real_b :: selffrac(jplay)
integer_m :: indself(jplay)

!- from SP             
real_b :: pfrac(jpgpt,jplay)

integer_m :: jfrac(jplay)
real_b :: ffrac(jplay),zfs(jplay),speccomb(jplay)
integer_m :: ind0(jplay),ind1(jplay),inds(jplay),iioff(jplay)

!      REAL TAUAER(JPLAY)
real_b :: n2omult(jplay)

!     LOCAL INTEGER SCALARS
integer_m :: ig, ioff, js, lay, ns

!     LOCAL REAL SCALARS
real_b :: colref1, colref2, currn2o, fac000, fac001,&
          &fac010, fac011, fac100, fac101, fac110, fac111, &
          &fp, fs, ratio, specmult, specparm, wcomb1, &
          &wcomb2

!      EQUIVALENCE (TAUAERL(1,9),TAUAER)

ioff = 0

!     Compute the optical depth by interpolating in ln(pressure), 
!     temperature, and appropriate species.  Below LAYTROP, the water
!     vapor self-continuum is interpolated (in temperature) separately.
  
DO lay = 1, laytrop
  speccomb(lay) = colh2o(lay) + strrat*colch4(lay)
  specparm = colh2o(lay)/speccomb(lay)
  specparm=min(oneminus,specparm)
  specmult = 8._jprb*(specparm)
  js = 1 + int(specmult)
  jfrac(lay) = js
  fs = mod(specmult,_one_)
  ffrac(lay) = fs
  IF (js  ==  8) THEN
    IF (fs.LE. 0.68_jprb) THEN
      fs = fs/0.68_jprb
    ELSEIF (fs  <=  0.92_jprb) THEN
      js = js + 1
      fs = (fs-0.68_jprb)/0.24_jprb
    ELSE
      js = js + 2
      fs = (fs-0.92_jprb)/0.08_jprb
    ENDIF
  ELSEIF (js  == 9) THEN
    js = 10
    fs = _one_
    jfrac(lay) = 8
    ffrac(lay) = _one_
  ENDIF
  fp = fac01(lay) + fac11(lay)
  ns = js + int(fs + _half_)
  ind0(lay) = ((jp(lay)-1)*5+(jt(lay)-1))*nspa(9) + js
  ind1(lay) = (jp(lay)*5+(jt1(lay)-1))*nspa(9) + js
  inds(lay) = indself(lay)
  IF (lay  ==  laylow) ioff = ng9
  IF (lay  ==  layswtch) ioff = 2*ng9
  colref1 = n2oref(jp(lay))
  colref2 = n2oref(jp(lay)+1)
  IF (ns  ==  11) THEN
    wcomb1 = _one_/h2oref(jp(lay))
    wcomb2 = _one_/h2oref(jp(lay)+1)
  ELSE
    wcomb1 = (_one_-etaref(ns))/(strrat * ch4ref(jp(lay)))
    wcomb2 = (_one_-etaref(ns))/(strrat * ch4ref(jp(lay)+1))
  ENDIF
  ratio = (colref1*wcomb1)+fp*((colref2*wcomb2)-(colref1*wcomb1))
  currn2o = speccomb(lay) * ratio
  n2omult(lay) = coln2o(lay) - currn2o

  zfs(lay)=fs
  iioff(lay)=ioff

ENDDO

!-- DS_000515
DO ig = 1, ng9
  DO lay = 1, laytrop
!-- DS_000515

    fs=zfs(lay)
    ioff=iioff(lay)
!---jjm
!    FAC000 = (_ONE_ - FS) * FAC00(LAY)
!    FAC010 = (_ONE_ - FS) * FAC10(LAY)
!    FAC100 = FS * FAC00(LAY)
!    FAC110 = FS * FAC10(LAY)
!    FAC001 = (_ONE_ - FS) * FAC01(LAY)
!    FAC011 = (_ONE_ - FS) * FAC11(LAY)
!    FAC101 = FS * FAC01(LAY)
!    FAC111 = FS * FAC11(LAY)
!------         

    tau(ngs8+ig,lay) = speccomb(lay) *&
!-- DS_000515
!     &(FAC000 * ABSA(IND0(LAY)   ,IG) +&
!     & FAC100 * ABSA(IND0(LAY)+ 1,IG) +&
!     & FAC010 * ABSA(IND0(LAY)+11,IG) +&
!     & FAC110 * ABSA(IND0(LAY)+12,IG) +&
!     & FAC001 * ABSA(IND1(LAY)   ,IG) +&
!     & FAC101 * ABSA(IND1(LAY)+ 1,IG) +&
!     & FAC011 * ABSA(IND1(LAY)+11,IG) +&
!     & FAC111 * ABSA(IND1(LAY)+12,IG))+&
     &( (1. - fs) *(fac00(lay) * absa(ind0(lay)   ,ig) +   &
     &              fac10(lay) * absa(ind0(lay)+11,ig) +   &
     &              fac01(lay) * absa(ind1(lay)   ,ig) +   &
     &              fac11(lay) * absa(ind1(lay)+11,ig))+   &
     &     fs     *(fac00(lay) * absa(ind0(lay)+ 1,ig) +   &
     &              fac10(lay) * absa(ind0(lay)+12,ig) +   &
     &              fac01(lay) * absa(ind1(lay)+ 1,ig) +   &
     &              fac11(lay) * absa(ind1(lay)+12,ig))) + &
!-- DS_000515
     &colh2o(lay) * &
     &selffac(lay) * (selfref(inds(lay),ig) + &
     &selffrac(lay) *&
     &(selfref(inds(lay)+1,ig) - selfref(inds(lay),ig)))&
     &+ n2omult(lay) * absn2o(ig+ioff)&
     &+ tauaerl(lay,9)
    pfrac(ngs8+ig,lay) = fracrefa(ig,jfrac(lay)) + ffrac(lay) *&
     &(fracrefa(ig,jfrac(lay)+1) - fracrefa(ig,jfrac(lay)))
  ENDDO
ENDDO

DO lay = laytrop+1, klev
  ind0(lay) = ((jp(lay)-13)*5+(jt(lay)-1))*nspb(9) + 1
  ind1(lay) = ((jp(lay)-12)*5+(jt1(lay)-1))*nspb(9) + 1
ENDDO

!-- JJM_000517
DO ig = 1, ng9
  DO lay = laytrop+1, klev
!-- JJM_000517
    tau(ngs8+ig,lay) = colch4(lay) *&
     &(fac00(lay) * absb(ind0(lay)  ,ig) +&
     & fac10(lay) * absb(ind0(lay)+1,ig) +&
     & fac01(lay) * absb(ind1(lay)  ,ig) +&
     & fac11(lay) * absb(ind1(lay)+1,ig))&
     &+ tauaerl(lay,9)
    pfrac(ngs8+ig,lay) = fracrefb(ig)
  ENDDO
ENDDO

RETURN
END SUBROUTINE rrtm_taumol9