!*******************************************************************************
SUBROUTINE RRTM_TAUMOL8 (KLEV,P_TAU,P_WX,&
 & P_TAUAERL,P_FAC00,P_FAC01,P_FAC10,P_FAC11,K_JP,K_JT,K_JT1,&
 & P_COLH2O,P_COLO3,P_COLN2O,P_CO2MULT,K_LAYSWTCH,P_SELFFAC,P_SELFFRAC,K_INDSELF,PFRAC)  

!     BAND 8:  1080-1180 cm-1 (low (i.e.>~300mb) - H2O; high - O3)

! Modifications
!        M.Hamrud      01-Oct-2003 CY28 Cleaning

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

USE PARKIND1  ,ONLY : JPIM     ,JPRB
USE YOMHOOK   ,ONLY : LHOOK,   DR_HOOK

USE PARRRTM  , ONLY : JPLAY  ,JPBAND ,JPGPT  ,JPXSEC ,NG8   ,NGS7
USE YOERRTWN , ONLY :      NSPA   ,NSPB
USE YOERRTA8 , ONLY : ABSA   ,ABSB   ,FRACREFA, FRACREFB,SELFREF,ABSCO2A , ABSCO2B ,&
 & ABSN2OA , ABSN2OB,CFC12  ,CFC22ADJ, H2OREF  ,&
 & N2OREF  , O3REF  

!  Input
!#include "yoeratm.h"

IMPLICIT NONE

INTEGER(KIND=JPIM),INTENT(IN)    :: KLEV 
REAL(KIND=JPRB)   ,INTENT(OUT)   :: P_TAU(JPGPT,JPLAY) 
REAL(KIND=JPRB)   ,INTENT(IN)    :: P_WX(JPXSEC,JPLAY) ! Amount of trace gases
REAL(KIND=JPRB)   ,INTENT(IN)    :: P_TAUAERL(JPLAY,JPBAND) 
REAL(KIND=JPRB)   ,INTENT(IN)    :: P_FAC00(JPLAY) 
REAL(KIND=JPRB)   ,INTENT(IN)    :: P_FAC01(JPLAY) 
REAL(KIND=JPRB)   ,INTENT(IN)    :: P_FAC10(JPLAY) 
REAL(KIND=JPRB)   ,INTENT(IN)    :: P_FAC11(JPLAY) 
INTEGER(KIND=JPIM),INTENT(IN)    :: K_JP(JPLAY) 
INTEGER(KIND=JPIM),INTENT(IN)    :: K_JT(JPLAY) 
INTEGER(KIND=JPIM),INTENT(IN)    :: K_JT1(JPLAY) 
REAL(KIND=JPRB)   ,INTENT(IN)    :: P_COLH2O(JPLAY) 
REAL(KIND=JPRB)   ,INTENT(IN)    :: P_COLO3(JPLAY) 
REAL(KIND=JPRB)   ,INTENT(IN)    :: P_COLN2O(JPLAY) 
REAL(KIND=JPRB)   ,INTENT(IN)    :: P_CO2MULT(JPLAY) 
INTEGER(KIND=JPIM),INTENT(IN)    :: K_LAYSWTCH 
REAL(KIND=JPRB)   ,INTENT(IN)    :: P_SELFFAC(JPLAY) 
REAL(KIND=JPRB)   ,INTENT(IN)    :: P_SELFFRAC(JPLAY) 
INTEGER(KIND=JPIM),INTENT(IN)    :: K_INDSELF(JPLAY) 
REAL(KIND=JPRB)   ,INTENT(OUT)   :: PFRAC(JPGPT,JPLAY) 
!  Output
!- from AER
!- from INTFAC      
!- from INTIND
!- from PROFDATA             
!- from SELF             
!- from SP             
INTEGER(KIND=JPIM) :: IND0(JPLAY),IND1(JPLAY),INDS(JPLAY)

!      REAL TAUAER(JPLAY)
REAL(KIND=JPRB) :: Z_N2OMULT(JPLAY)

INTEGER(KIND=JPIM) :: IG, I_LAY

REAL(KIND=JPRB) :: Z_COLREF1, Z_COLREF2, Z_CURRN2O, Z_FP, Z_RATIO, Z_WCOMB1, Z_WCOMB2
REAL(KIND=JPRB) :: ZHOOK_HANDLE

!      EQUIVALENCE (TAUAERL(1,8),TAUAER)

!     Compute the optical depth by interpolating in ln(pressure) and 
!     temperature.  

IF (LHOOK) CALL DR_HOOK('RRTM_TAUMOL8',0,ZHOOK_HANDLE)
DO I_LAY = 1, K_LAYSWTCH
  Z_FP = P_FAC01(I_LAY) + P_FAC11(I_LAY)
  IND0(I_LAY) = ((K_JP(I_LAY)-1)*5+(K_JT(I_LAY)-1))*NSPA(8) + 1
  IND1(I_LAY) = (K_JP(I_LAY)*5+(K_JT1(I_LAY)-1))*NSPA(8) + 1
  INDS(I_LAY) = K_INDSELF(I_LAY)
  Z_COLREF1 = N2OREF(K_JP(I_LAY))
  Z_COLREF2 = N2OREF(K_JP(I_LAY)+1)
  Z_WCOMB1 = 1.0_JPRB/H2OREF(K_JP(I_LAY))
  Z_WCOMB2 = 1.0_JPRB/H2OREF(K_JP(I_LAY)+1)
  Z_RATIO = (Z_COLREF1*Z_WCOMB1)+Z_FP*((Z_COLREF2*Z_WCOMB2)-(Z_COLREF1*Z_WCOMB1))
  Z_CURRN2O = P_COLH2O(I_LAY) * Z_RATIO
  Z_N2OMULT(I_LAY) = P_COLN2O(I_LAY) - Z_CURRN2O
ENDDO

!-- DS_000515
DO IG = 1, NG8
  DO I_LAY = 1, K_LAYSWTCH
!-- DS_000515
    P_TAU (NGS7+IG,I_LAY) = P_COLH2O(I_LAY) *&
     & (P_FAC00(I_LAY) * ABSA(IND0(I_LAY)  ,IG) +&
     & P_FAC10(I_LAY) * ABSA(IND0(I_LAY)+1,IG) +&
     & P_FAC01(I_LAY) * ABSA(IND1(I_LAY)  ,IG) +&
     & P_FAC11(I_LAY) * ABSA(IND1(I_LAY)+1,IG) +&
     & P_SELFFAC(I_LAY) * (SELFREF(INDS(I_LAY),IG) + &
     & P_SELFFRAC(I_LAY) *&
     & (SELFREF(INDS(I_LAY)+1,IG) - SELFREF(INDS(I_LAY),IG))))&
     & + P_WX(3,I_LAY) * CFC12(IG)&
     & + P_WX(4,I_LAY) * CFC22ADJ(IG)&
     & + P_CO2MULT(I_LAY) * ABSCO2A(IG)&
     & + Z_N2OMULT(I_LAY) * ABSN2OA(IG)&
     & + P_TAUAERL(I_LAY,8)  
    PFRAC(NGS7+IG,I_LAY) = FRACREFA(IG)
  ENDDO
ENDDO

DO I_LAY = K_LAYSWTCH+1, KLEV
  Z_FP = P_FAC01(I_LAY) + P_FAC11(I_LAY)
  IND0(I_LAY) = ((K_JP(I_LAY)-7)*5+(K_JT(I_LAY)-1))*NSPB(8) + 1
  IND1(I_LAY) = ((K_JP(I_LAY)-6)*5+(K_JT1(I_LAY)-1))*NSPB(8) + 1
  Z_COLREF1 = N2OREF(K_JP(I_LAY))
  Z_COLREF2 = N2OREF(K_JP(I_LAY)+1)
  Z_WCOMB1 = 1.0_JPRB/O3REF(K_JP(I_LAY))
  Z_WCOMB2 = 1.0_JPRB/O3REF(K_JP(I_LAY)+1)
  Z_RATIO = (Z_COLREF1*Z_WCOMB1)+Z_FP*((Z_COLREF2*Z_WCOMB2)-(Z_COLREF1*Z_WCOMB1))
  Z_CURRN2O = P_COLO3(I_LAY) * Z_RATIO
  Z_N2OMULT(I_LAY) = P_COLN2O(I_LAY) - Z_CURRN2O
ENDDO

!-- JJM_000517
DO IG = 1, NG8
  DO I_LAY = K_LAYSWTCH+1, KLEV
!-- JJM_000517
    P_TAU (NGS7+IG,I_LAY) = P_COLO3(I_LAY) *&
     & (P_FAC00(I_LAY) * ABSB(IND0(I_LAY)  ,IG) +&
     & P_FAC10(I_LAY) * ABSB(IND0(I_LAY)+1,IG) +&
     & P_FAC01(I_LAY) * ABSB(IND1(I_LAY)  ,IG) +&
     & P_FAC11(I_LAY) * ABSB(IND1(I_LAY)+1,IG)) &
     & + P_WX(3,I_LAY) * CFC12(IG)&
     & + P_WX(4,I_LAY) * CFC22ADJ(IG)&
     & + P_CO2MULT(I_LAY) * ABSCO2B(IG)&
     & + Z_N2OMULT(I_LAY) * ABSN2OB(IG)&
     & + P_TAUAERL(I_LAY,8)  
    PFRAC(NGS7+IG,I_LAY) = FRACREFB(IG)
  ENDDO
ENDDO

IF (LHOOK) CALL DR_HOOK('RRTM_TAUMOL8',1,ZHOOK_HANDLE)
END SUBROUTINE RRTM_TAUMOL8