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SUBROUTINE LWC & |
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& ( KIDIA , KFDIA, KLON , KLEV,& |
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& PBINT , PBSUI, PCLDLD, PCLDLU,& |
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& PCNTRB, PEMIT, PFLUC,& |
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& PFLUX & |
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& ) |
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!**** *LWC* - LONGWAVE RADIATION, CLOUD EFFECTS |
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! PURPOSE. |
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! -------- |
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! INTRODUCES CLOUD EFFECTS ON LONGWAVE FLUXES OR |
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! RADIANCES |
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!** INTERFACE. |
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! ---------- |
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! EXPLICIT ARGUMENTS : |
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! -------------------- |
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! ==== INPUTS === |
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! PBINT : (KLON,KLEV+1) ; HALF LEVEL PLANCK FUNCTION |
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! PBSUI : (KLON) ; SURFACE PLANCK FUNCTION |
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! PCLDLD : (KLON,KLEV) ; DOWNWARD EFFECTIVE CLOUD FRACTION |
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! PCLDLU : (KLON,KLEV) ; UPWARD EFFECTIVE CLOUD FRACTION |
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! PCNTRB : (KLON,KLEV+1,KLEV+1); CLEAR-SKY ENERGY EXCHANGE MATRIX |
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! PEMIT : (KLON) ; SURFACE TOTAL LW EMISSIVITY |
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! PFLUC : (KLON,2,KLEV+1) ; CLEAR-SKY LW RADIATIVE FLUXES |
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! ==== OUTPUTS === |
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! PFLUX : (KLON,2,KLEV+1) ; TOTAL SKY LW RADIATIVE FLUXES : |
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! 1 ==> UPWARD FLUX TOTAL |
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! 2 ==> DOWNWARD FLUX TOTAL |
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! IMPLICIT ARGUMENTS : NONE |
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! -------------------- |
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! METHOD. |
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! ------- |
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! 1. INITIALIZES ALL FLUXES TO CLEAR-SKY VALUES |
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! 2. EFFECT OF ONE OVERCAST UNITY EMISSIVITY CLOUD LAYER |
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! 3. EFFECT OF SEMI-TRANSPARENT, PARTIAL OR MULTI-LAYERED |
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! CLOUDS |
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! EXTERNALS. |
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! ---------- |
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! NONE |
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! REFERENCE. |
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! ---------- |
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! SEE RADIATION'S PART OF THE MODEL'S DOCUMENTATION AND |
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! ECMWF RESEARCH DEPARTMENT DOCUMENTATION OF THE IFS |
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! AUTHOR. |
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! ------- |
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! JEAN-JACQUES MORCRETTE *ECMWF* |
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! MODIFICATIONS. |
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! -------------- |
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! ORIGINAL : 89-07-14 |
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! JJ Morcrette 97-04-18 Cleaning |
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! JJMorcrette 01-02-16 Hogan & Illingworth (2001)'s mixed overlap |
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! M.Hamrud 01-Oct-2003 CY28 Cleaning |
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!----------------------------------------------------------------------- |
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USE PARKIND1 ,ONLY : JPIM ,JPRB |
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USE YOMHOOK ,ONLY : LHOOK, DR_HOOK |
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USE YOERAD , ONLY : NOVLP |
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USE YOERDI , ONLY : REPCLC |
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USE YOEOVLP , ONLY : RA1OVLP |
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IMPLICIT NONE |
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INTEGER(KIND=JPIM),INTENT(IN) :: KLON |
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INTEGER(KIND=JPIM),INTENT(IN) :: KLEV |
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INTEGER(KIND=JPIM),INTENT(IN) :: KIDIA |
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INTEGER(KIND=JPIM),INTENT(IN) :: KFDIA |
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REAL(KIND=JPRB) ,INTENT(IN) :: PBINT(KLON,KLEV+1) |
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REAL(KIND=JPRB) ,INTENT(IN) :: PBSUI(KLON) |
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REAL(KIND=JPRB) ,INTENT(IN) :: PCLDLD(KLON,KLEV) |
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REAL(KIND=JPRB) ,INTENT(IN) :: PCLDLU(KLON,KLEV) |
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REAL(KIND=JPRB) ,INTENT(IN) :: PCNTRB(KLON,KLEV+1,KLEV+1) |
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REAL(KIND=JPRB) ,INTENT(IN) :: PEMIT(KLON) |
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REAL(KIND=JPRB) ,INTENT(IN) :: PFLUC(KLON,2,KLEV+1) |
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REAL(KIND=JPRB) ,INTENT(OUT) :: PFLUX(KLON,2,KLEV+1) |
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!----------------------------------------------------------------------- |
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!* 0.1 ARGUMENTS |
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! --------- |
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!----------------------------------------------------------------------- |
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! ------------ |
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REAL(KIND=JPRB) :: ZCLEAR(KLON) , ZCLOUD(KLON)& |
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& , ZCLM(KLON,KLEV+1,KLEV+1), ZDNF(KLON,KLEV+1,KLEV+1)& |
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& , ZFD(KLON) , ZFU(KLON)& |
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& , ZUPF(KLON,KLEV+1,KLEV+1) |
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INTEGER(KIND=JPIM) :: IKCP1, IKM1, IKP1, IMAXC, IMXM1, IMXP1, JCLOUD,& |
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& JK, JK1, JK2, JKJ, JL |
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REAL(KIND=JPRB) :: ZALPHA1, ZCFRAC |
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REAL(KIND=JPRB) :: ZHOOK_HANDLE |
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! ------------------------------------------------------------------ |
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!* 1. INITIALIZATION |
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! -------------- |
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!100 CONTINUE |
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! print *,' Enter LWC ' |
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IF (LHOOK) CALL DR_HOOK('LWC',0,ZHOOK_HANDLE) |
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DO JL = KIDIA,KFDIA |
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ZCLOUD(JL) = 0.0_JPRB |
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ENDDO |
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DO JK = 1 , KLEV+1 |
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DO JL = KIDIA,KFDIA |
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PFLUX(JL,1,JK) = PFLUC(JL,1,JK) |
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PFLUX(JL,2,JK) = PFLUC(JL,2,JK) |
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ENDDO |
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ENDDO |
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!GM******* |
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IMAXC=KLEV |
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!GM******* |
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! ------------------------------------------------------------------ |
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!* 2. EFFECT OF CLOUDINESS ON LONGWAVE FLUXES |
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! --------------------------------------- |
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IMXP1 = IMAXC + 1 |
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IMXM1 = IMAXC - 1 |
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!* 2.0 INITIALIZE TO CLEAR-SKY FLUXES |
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! ------------------------------ |
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!200 CONTINUE |
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DO JK1=1,KLEV+1 |
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DO JK2=1,KLEV+1 |
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DO JL = KIDIA,KFDIA |
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ZUPF(JL,JK2,JK1)=PFLUC(JL,1,JK1) |
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ZDNF(JL,JK2,JK1)=PFLUC(JL,2,JK1) |
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ENDDO |
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ENDDO |
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ENDDO |
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! print *,' LWC after Initialisation to clear-sky fluxes' |
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!* 2.1 FLUXES FOR ONE OVERCAST UNITY EMISSIVITY CLOUD |
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! ---------------------------------------------- |
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!210 CONTINUE |
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DO JCLOUD = 1 , IMAXC |
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IKCP1=JCLOUD+1 |
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!* 2.1.1 ABOVE THE CLOUD |
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! --------------- |
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!2110 CONTINUE |
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DO JK=IKCP1,KLEV+1 |
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IKM1=JK-1 |
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DO JL = KIDIA,KFDIA |
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ZFU(JL)=0.0_JPRB |
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ENDDO |
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IF (JK > IKCP1) THEN |
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DO JKJ=IKCP1,IKM1 |
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DO JL = KIDIA,KFDIA |
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ZFU(JL) = ZFU(JL) + PCNTRB(JL,JK,JKJ) |
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ENDDO |
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ENDDO |
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ENDIF |
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DO JL = KIDIA,KFDIA |
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ZUPF(JL,IKCP1,JK)=PBINT(JL,JK)-ZFU(JL) |
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ENDDO |
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ENDDO |
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!* 2.1.2 BELOW THE CLOUD |
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! --------------- |
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!2120 CONTINUE |
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DO JK=1,JCLOUD |
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IKP1=JK+1 |
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DO JL = KIDIA,KFDIA |
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ZFD(JL)=0.0_JPRB |
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ENDDO |
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IF (JK < JCLOUD) THEN |
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DO JKJ=IKP1,JCLOUD |
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DO JL = KIDIA,KFDIA |
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ZFD(JL) = ZFD(JL) + PCNTRB(JL,JK,JKJ) |
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ENDDO |
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ENDDO |
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ENDIF |
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DO JL = KIDIA,KFDIA |
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ZDNF(JL,IKCP1,JK)=-PBINT(JL,JK)-ZFD(JL) |
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ENDDO |
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ENDDO |
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ENDDO |
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! print *,' LWC after 213: Fluxes for unity emissivity' |
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!* 2.2 CLOUD COVER MATRIX |
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! ------------------ |
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!* ZCLM(JK1,JK2) IS THE OBSCURATION FACTOR BY CLOUD LAYERS BETWEEN |
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! HALF-LEVELS JK1 AND JK2 AS SEEN FROM JK1 |
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!220 CONTINUE |
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DO JK1 = 1 , KLEV+1 |
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DO JK2 = 1 , KLEV+1 |
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DO JL = KIDIA,KFDIA |
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ZCLM(JL,JK1,JK2) = 0.0_JPRB |
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ENDDO |
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ENDDO |
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ENDDO |
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! print *,' LWC after Initialisation CC matrix' |
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!* 2.4 CLOUD COVER BELOW THE LEVEL OF CALCULATION |
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! ------------------------------------------ |
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!240 CONTINUE |
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DO JK1 = 2 , KLEV+1 |
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DO JL = KIDIA,KFDIA |
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ZCLEAR(JL)=1.0_JPRB |
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ZCLOUD(JL)=0.0_JPRB |
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ENDDO |
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DO JK = JK1 - 1 , 1 , -1 |
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ZALPHA1=RA1OVLP(KLEV+1-JK) |
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DO JL = KIDIA,KFDIA |
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!++MODIFCODE |
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IF ((NOVLP==1).OR.(NOVLP==6).OR.(NOVLP==8)) THEN |
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!--MODIFCODE |
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!* maximum-random |
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ZCLEAR(JL)=ZCLEAR(JL)*(1.0_JPRB-MAX(PCLDLU(JL,JK),ZCLOUD(JL)))& |
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& /(1.0_JPRB-MIN(ZCLOUD(JL),1.0_JPRB-REPCLC)) |
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ZCLM(JL,JK1,JK) = 1.0_JPRB - ZCLEAR(JL) |
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ZCLOUD(JL) = PCLDLU(JL,JK) |
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!++MODIFCODE |
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ELSEIF ((NOVLP==2).OR.(NOVLP==7)) THEN |
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!--MODIFCODE |
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!* maximum |
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ZCLOUD(JL) = MAX(ZCLOUD(JL) , PCLDLU(JL,JK)) |
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ZCLM(JL,JK1,JK) = ZCLOUD(JL) |
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!++MODIFCODE |
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ELSEIF ((NOVLP == 3).OR.(NOVLP==5)) THEN |
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!--MODIFCODE |
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!* random |
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ZCLEAR(JL) = ZCLEAR(JL)*(1.0_JPRB - PCLDLU(JL,JK)) |
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ZCLOUD(JL) = 1.0_JPRB - ZCLEAR(JL) |
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ZCLM(JL,JK1,JK) = ZCLOUD(JL) |
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ELSEIF (NOVLP == 4) THEN |
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!** Hogan & Illingworth (2001) |
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ZCLEAR(JL)=ZCLEAR(JL)*( & |
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& ZALPHA1*(1.0_JPRB-MAX(PCLDLU(JL,JK),ZCLOUD(JL))) & |
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& /(1.0_JPRB-MIN(ZCLOUD(JL),1.0_JPRB-REPCLC)) & |
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& +(1.0_JPRB-ZALPHA1)*(1.0_JPRB-PCLDLU(JL,JK)) ) |
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ZCLM(JL,JK1,JK) = 1.0_JPRB - ZCLEAR(JL) |
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ZCLOUD(JL) = PCLDLU(JL,JK) |
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ENDIF |
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ENDDO |
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ENDDO |
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ENDDO |
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! print *,' LWC after 244: CC below level of calculation' |
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!* 2.5 CLOUD COVER ABOVE THE LEVEL OF CALCULATION |
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! ------------------------------------------ |
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!250 CONTINUE |
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DO JK1 = 1 , KLEV |
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DO JL = KIDIA,KFDIA |
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ZCLEAR(JL)=1.0_JPRB |
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ZCLOUD(JL)=0.0_JPRB |
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ENDDO |
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DO JK = JK1 , KLEV |
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ZALPHA1=RA1OVLP(KLEV+1-JK) |
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DO JL = KIDIA,KFDIA |
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!++MODIFCODE |
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IF ((NOVLP == 1).OR.(NOVLP==6).OR.(NOVLP==8)) THEN |
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!--MODIFCODE |
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!* maximum-random |
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ZCLEAR(JL)=ZCLEAR(JL)*(1.0_JPRB-MAX(PCLDLD(JL,JK),ZCLOUD(JL)))& |
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& /(1.0_JPRB-MIN(ZCLOUD(JL),1.0_JPRB-REPCLC)) |
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ZCLM(JL,JK1,JK) = 1.0_JPRB - ZCLEAR(JL) |
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ZCLOUD(JL) = PCLDLD(JL,JK) |
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!++MODIFCODE |
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ELSEIF ((NOVLP == 2).OR.(NOVLP==7)) THEN |
308 |
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!--MODIFCODE |
309 |
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!* maximum |
310 |
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ZCLOUD(JL) = MAX(ZCLOUD(JL) , PCLDLD(JL,JK)) |
311 |
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ZCLM(JL,JK1,JK) = ZCLOUD(JL) |
312 |
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!++MODIFCODE |
313 |
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ELSEIF ((NOVLP == 3).OR.(NOVLP==5)) THEN |
314 |
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!--MODIFCODE |
315 |
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!* random |
316 |
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ZCLEAR(JL) = ZCLEAR(JL)*(1.0_JPRB - PCLDLD(JL,JK)) |
317 |
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ZCLOUD(JL) = 1.0_JPRB - ZCLEAR(JL) |
318 |
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ZCLM(JL,JK1,JK) = ZCLOUD(JL) |
319 |
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ELSEIF (NOVLP == 4) THEN |
320 |
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!** Hogan & Illingworth (2001) |
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ZCLEAR(JL)=ZCLEAR(JL)*( & |
322 |
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& ZALPHA1*(1.0_JPRB-MAX(PCLDLD(JL,JK),ZCLOUD(JL))) & |
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& /(1.0_JPRB-MIN(ZCLOUD(JL),1.0_JPRB-REPCLC)) & |
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& +(1.0_JPRB-ZALPHA1)*(1.0_JPRB - PCLDLD(JL,JK)) ) |
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ZCLM(JL,JK1,JK) = 1.0_JPRB - ZCLEAR(JL) |
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ZCLOUD(JL) = PCLDLD(JL,JK) |
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ENDIF |
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ENDDO |
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ENDDO |
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ENDDO |
331 |
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! print *,' LWC after 254: CC above level of calculation' |
332 |
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333 |
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!* 3. FLUXES FOR PARTIAL/MULTIPLE LAYERED CLOUDINESS |
334 |
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! ---------------------------------------------- |
335 |
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336 |
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!300 CONTINUE |
337 |
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338 |
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!* 3.1 DOWNWARD FLUXES |
339 |
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! --------------- |
340 |
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341 |
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!310 CONTINUE |
342 |
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343 |
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DO JL = KIDIA,KFDIA |
344 |
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PFLUX(JL,2,KLEV+1) = 0.0_JPRB |
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ENDDO |
346 |
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347 |
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DO JK1 = KLEV , 1 , -1 |
348 |
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349 |
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!* CONTRIBUTION FROM CLEAR-SKY FRACTION |
350 |
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351 |
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DO JL = KIDIA,KFDIA |
352 |
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ZFD (JL) = (1.0_JPRB - ZCLM(JL,JK1,KLEV)) * ZDNF(JL,1,JK1) |
353 |
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354 |
|
|
!* CONTRIBUTION FROM ADJACENT CLOUD |
355 |
|
|
|
356 |
|
|
ZFD(JL) = ZFD(JL) + ZCLM(JL,JK1,JK1) * ZDNF(JL,JK1+1,JK1) |
357 |
|
|
ENDDO |
358 |
|
|
|
359 |
|
|
!* CONTRIBUTION FROM OTHER CLOUDY FRACTIONS |
360 |
|
|
|
361 |
|
|
DO JK = KLEV-1 , JK1 , -1 |
362 |
|
|
DO JL = KIDIA,KFDIA |
363 |
|
|
ZCFRAC = ZCLM(JL,JK1,JK+1) - ZCLM(JL,JK1,JK) |
364 |
|
|
ZFD(JL) = ZFD(JL) + ZCFRAC * ZDNF(JL,JK+2,JK1) |
365 |
|
|
ENDDO |
366 |
|
|
ENDDO |
367 |
|
|
|
368 |
|
|
DO JL = KIDIA,KFDIA |
369 |
|
|
PFLUX(JL,2,JK1) = ZFD (JL) |
370 |
|
|
ENDDO |
371 |
|
|
|
372 |
|
|
ENDDO |
373 |
|
|
! print *,' LWC after 317: Downward fluxes' |
374 |
|
|
|
375 |
|
|
!* 3.2 UPWARD FLUX AT THE SURFACE |
376 |
|
|
! -------------------------- |
377 |
|
|
|
378 |
|
|
!320 CONTINUE |
379 |
|
|
|
380 |
|
|
DO JL = KIDIA,KFDIA |
381 |
|
|
PFLUX(JL,1,1) = PEMIT(JL)*PBSUI(JL)-(1.0_JPRB-PEMIT(JL))*PFLUX(JL,2,1) |
382 |
|
|
ENDDO |
383 |
|
|
|
384 |
|
|
!* 3.3 UPWARD FLUXES |
385 |
|
|
! ------------- |
386 |
|
|
|
387 |
|
|
!330 CONTINUE |
388 |
|
|
|
389 |
|
|
DO JK1 = 2 , KLEV+1 |
390 |
|
|
|
391 |
|
|
!* CONTRIBUTION FROM CLEAR-SKY FRACTION |
392 |
|
|
|
393 |
|
|
DO JL = KIDIA,KFDIA |
394 |
|
|
ZFU (JL) = (1.0_JPRB - ZCLM(JL,JK1,1)) * ZUPF(JL,1,JK1) |
395 |
|
|
|
396 |
|
|
!* CONTRIBUTION FROM ADJACENT CLOUD |
397 |
|
|
|
398 |
|
|
ZFU(JL) = ZFU(JL) + ZCLM(JL,JK1,JK1-1) * ZUPF(JL,JK1,JK1) |
399 |
|
|
ENDDO |
400 |
|
|
|
401 |
|
|
!* CONTRIBUTION FROM OTHER CLOUDY FRACTIONS |
402 |
|
|
|
403 |
|
|
DO JK = 2 , JK1-1 |
404 |
|
|
DO JL = KIDIA,KFDIA |
405 |
|
|
ZCFRAC = ZCLM(JL,JK1,JK-1) - ZCLM(JL,JK1,JK) |
406 |
|
|
ZFU(JL) = ZFU(JL) + ZCFRAC * ZUPF(JL,JK ,JK1) |
407 |
|
|
ENDDO |
408 |
|
|
ENDDO |
409 |
|
|
|
410 |
|
|
DO JL = KIDIA,KFDIA |
411 |
|
|
PFLUX(JL,1,JK1) = ZFU (JL) |
412 |
|
|
ENDDO |
413 |
|
|
|
414 |
|
|
ENDDO |
415 |
|
|
! print *,' LWC after 337: Upward fluxes' |
416 |
|
|
|
417 |
|
|
!----------------------------------------------------------------------- |
418 |
|
|
|
419 |
|
|
IF (LHOOK) CALL DR_HOOK('LWC',1,ZHOOK_HANDLE) |
420 |
|
|
END SUBROUTINE LWC |