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SUBROUTINE LWC(KLIM,PCLDLD,PCLDLU,PEMIS,PFLUC, |
2 |
R PBINT,PBSUIN,PCTS,PCNTRB, |
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S PFLUX) |
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use dimens_m |
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use dimphy |
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use raddim |
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use radepsi |
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use radopt |
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IMPLICIT none |
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C |
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C PURPOSE. |
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C -------- |
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C INTRODUCES CLOUD EFFECTS ON LONGWAVE FLUXES OR |
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C RADIANCES |
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C |
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C EXPLICIT ARGUMENTS : |
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C -------------------- |
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C ==== INPUTS === |
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C PBINT : (KDLON,0:KFLEV) ; HALF LEVEL PLANCK FUNCTION |
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C PBSUIN : (KDLON) ; SURFACE PLANCK FUNCTION |
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C PCLDLD : (KDLON,KFLEV) ; DOWNWARD EFFECTIVE CLOUD FRACTION |
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C PCLDLU : (KDLON,KFLEV) ; UPWARD EFFECTIVE CLOUD FRACTION |
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C PCNTRB : (KDLON,KFLEV+1,KFLEV+1); CLEAR-SKY ENERGY EXCHANGE |
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C PCTS : (KDLON,KFLEV) ; CLEAR-SKY LAYER COOLING-TO-SPACE |
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C PEMIS : (KDLON) ; SURFACE EMISSIVITY |
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C PFLUC |
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C ==== OUTPUTS === |
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C PFLUX(KDLON,2,KFLEV) ; RADIATIVE FLUXES : |
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C 1 ==> UPWARD FLUX TOTAL |
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C 2 ==> DOWNWARD FLUX TOTAL |
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C |
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C METHOD. |
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C ------- |
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C |
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C 1. INITIALIZES ALL FLUXES TO CLEAR-SKY VALUES |
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C 2. EFFECT OF ONE OVERCAST UNITY EMISSIVITY CLOUD LAYER |
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C 3. EFFECT OF SEMI-TRANSPARENT, PARTIAL OR MULTI-LAYERED |
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C CLOUDS |
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C |
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C REFERENCE. |
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C ---------- |
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C |
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C SEE RADIATION'S PART OF THE MODEL'S DOCUMENTATION AND |
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C ECMWF RESEARCH DEPARTMENT DOCUMENTATION OF THE IFS |
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C |
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C AUTHOR. |
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C ------- |
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C JEAN-JACQUES MORCRETTE *ECMWF* |
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C |
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C MODIFICATIONS. |
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C -------------- |
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C ORIGINAL : 89-07-14 |
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C Voigt lines (loop 231 to 233) - JJM & PhD - 01/96 |
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C----------------------------------------------------------------------- |
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C* ARGUMENTS: |
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INTEGER klim |
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DOUBLE PRECISION PFLUC(KDLON,2,KFLEV+1) ! CLEAR-SKY RADIATIVE FLUXES |
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DOUBLE PRECISION PBINT(KDLON,KFLEV+1) ! HALF LEVEL PLANCK FUNCTION |
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DOUBLE PRECISION PBSUIN(KDLON) ! SURFACE PLANCK FUNCTION |
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DOUBLE PRECISION PCNTRB(KDLON,KFLEV+1,KFLEV+1) !CLEAR-SKY ENERGY EXCHANGE |
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DOUBLE PRECISION PCTS(KDLON,KFLEV) ! CLEAR-SKY LAYER COOLING-TO-SPACE |
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c |
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DOUBLE PRECISION PCLDLD(KDLON,KFLEV) |
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DOUBLE PRECISION PCLDLU(KDLON,KFLEV) |
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DOUBLE PRECISION PEMIS(KDLON) |
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C |
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DOUBLE PRECISION PFLUX(KDLON,2,KFLEV+1) |
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C----------------------------------------------------------------------- |
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C* LOCAL VARIABLES: |
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INTEGER IMX(KDLON), IMXP(KDLON) |
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C |
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DOUBLE PRECISION ZCLEAR(KDLON),ZCLOUD(KDLON) |
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DOUBLE PRECISION ZDNF(KDLON,KFLEV+1,KFLEV+1) |
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S , ZFD(KDLON), ZFN10(KDLON), ZFU(KDLON) |
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S , ZUPF(KDLON,KFLEV+1,KFLEV+1) |
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DOUBLE PRECISION ZCLM(KDLON,KFLEV+1,KFLEV+1) |
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C |
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INTEGER jk, jl, imaxc, imx1, imx2, jkj, jkp1, jkm1 |
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INTEGER jk1, jk2, jkc, jkcp1, jcloud |
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INTEGER imxm1, imxp1 |
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DOUBLE PRECISION zcfrac |
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C ------------------------------------------------------------------ |
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C |
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C* 1. INITIALIZATION |
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C -------------- |
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C |
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100 CONTINUE |
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C |
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IMAXC = 0 |
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C |
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DO 101 JL = 1, KDLON |
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IMX(JL)=0 |
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IMXP(JL)=0 |
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ZCLOUD(JL) = 0. |
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101 CONTINUE |
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C |
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C* 1.1 SEARCH THE LAYER INDEX OF THE HIGHEST CLOUD |
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C ------------------------------------------- |
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C |
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110 CONTINUE |
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C |
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DO 112 JK = 1 , KFLEV |
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DO 111 JL = 1, KDLON |
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IMX1=IMX(JL) |
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IMX2=JK |
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IF (PCLDLU(JL,JK).GT.ZEPSC) THEN |
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IMXP(JL)=IMX2 |
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ELSE |
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IMXP(JL)=IMX1 |
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END IF |
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IMAXC=MAX(IMXP(JL),IMAXC) |
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IMX(JL)=IMXP(JL) |
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111 CONTINUE |
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112 CONTINUE |
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CGM******* |
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IMAXC=KFLEV |
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CGM******* |
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C |
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DO 114 JK = 1 , KFLEV+1 |
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DO 113 JL = 1, KDLON |
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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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113 CONTINUE |
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114 CONTINUE |
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C |
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C ------------------------------------------------------------------ |
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C |
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C* 2. EFFECT OF CLOUDINESS ON LONGWAVE FLUXES |
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C --------------------------------------- |
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C |
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IF (IMAXC.GT.0) THEN |
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C |
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IMXP1 = IMAXC + 1 |
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IMXM1 = IMAXC - 1 |
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C |
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C* 2.0 INITIALIZE TO CLEAR-SKY FLUXES |
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C ------------------------------ |
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C |
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200 CONTINUE |
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C |
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DO 203 JK1=1,KFLEV+1 |
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DO 202 JK2=1,KFLEV+1 |
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DO 201 JL = 1, KDLON |
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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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201 CONTINUE |
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202 CONTINUE |
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203 CONTINUE |
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C |
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C* 2.1 FLUXES FOR ONE OVERCAST UNITY EMISSIVITY CLOUD |
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C ---------------------------------------------- |
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C |
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210 CONTINUE |
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C |
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DO 213 JKC = 1 , IMAXC |
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JCLOUD=JKC |
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JKCP1=JCLOUD+1 |
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C |
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C* 2.1.1 ABOVE THE CLOUD |
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C --------------- |
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C |
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2110 CONTINUE |
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C |
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DO 2115 JK=JKCP1,KFLEV+1 |
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JKM1=JK-1 |
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DO 2111 JL = 1, KDLON |
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ZFU(JL)=0. |
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2111 CONTINUE |
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IF (JK .GT. JKCP1) THEN |
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DO 2113 JKJ=JKCP1,JKM1 |
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DO 2112 JL = 1, KDLON |
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ZFU(JL) = ZFU(JL) + PCNTRB(JL,JK,JKJ) |
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2112 CONTINUE |
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2113 CONTINUE |
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END IF |
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C |
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DO 2114 JL = 1, KDLON |
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ZUPF(JL,JKCP1,JK)=PBINT(JL,JK)-ZFU(JL) |
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2114 CONTINUE |
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2115 CONTINUE |
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C |
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C* 2.1.2 BELOW THE CLOUD |
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C --------------- |
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C |
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2120 CONTINUE |
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C |
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DO 2125 JK=1,JCLOUD |
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JKP1=JK+1 |
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DO 2121 JL = 1, KDLON |
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ZFD(JL)=0. |
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2121 CONTINUE |
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C |
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IF (JK .LT. JCLOUD) THEN |
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DO 2123 JKJ=JKP1,JCLOUD |
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DO 2122 JL = 1, KDLON |
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ZFD(JL) = ZFD(JL) + PCNTRB(JL,JK,JKJ) |
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2122 CONTINUE |
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2123 CONTINUE |
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END IF |
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DO 2124 JL = 1, KDLON |
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ZDNF(JL,JKCP1,JK)=-PBINT(JL,JK)-ZFD(JL) |
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2124 CONTINUE |
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2125 CONTINUE |
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C |
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213 CONTINUE |
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C |
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C |
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C* 2.2 CLOUD COVER MATRIX |
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C ------------------ |
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C |
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C* ZCLM(JK1,JK2) IS THE OBSCURATION FACTOR BY CLOUD LAYERS BETWEEN |
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C HALF-LEVELS JK1 AND JK2 AS SEEN FROM JK1 |
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C |
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220 CONTINUE |
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C |
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DO 223 JK1 = 1 , KFLEV+1 |
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DO 222 JK2 = 1 , KFLEV+1 |
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DO 221 JL = 1, KDLON |
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ZCLM(JL,JK1,JK2) = 0. |
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221 CONTINUE |
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222 CONTINUE |
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223 CONTINUE |
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C |
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C |
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C |
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C* 2.4 CLOUD COVER BELOW THE LEVEL OF CALCULATION |
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C ------------------------------------------ |
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C |
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240 CONTINUE |
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C |
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DO 244 JK1 = 2 , KFLEV+1 |
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DO 241 JL = 1, KDLON |
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ZCLEAR(JL)=1. |
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ZCLOUD(JL)=0. |
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241 CONTINUE |
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DO 243 JK = JK1 - 1 , 1 , -1 |
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DO 242 JL = 1, KDLON |
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IF (NOVLP.EQ.1) THEN |
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c* maximum-random |
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ZCLEAR(JL)=ZCLEAR(JL)*(1.0-MAX(PCLDLU(JL,JK),ZCLOUD(JL))) |
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* /(1.0-MIN(ZCLOUD(JL),1.-ZEPSEC)) |
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ZCLM(JL,JK1,JK) = 1.0 - ZCLEAR(JL) |
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ZCLOUD(JL) = PCLDLU(JL,JK) |
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ELSE IF (NOVLP.EQ.2) THEN |
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c* 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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ELSE IF (NOVLP.EQ.3) THEN |
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c* random |
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ZCLEAR(JL) = ZCLEAR(JL)*(1.0 - PCLDLU(JL,JK)) |
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ZCLOUD(JL) = 1.0 - ZCLEAR(JL) |
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ZCLM(JL,JK1,JK) = ZCLOUD(JL) |
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END IF |
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242 CONTINUE |
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243 CONTINUE |
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244 CONTINUE |
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C |
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C |
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C* 2.5 CLOUD COVER ABOVE THE LEVEL OF CALCULATION |
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C ------------------------------------------ |
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C |
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250 CONTINUE |
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C |
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DO 254 JK1 = 1 , KFLEV |
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DO 251 JL = 1, KDLON |
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ZCLEAR(JL)=1. |
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ZCLOUD(JL)=0. |
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251 CONTINUE |
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DO 253 JK = JK1 , KFLEV |
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DO 252 JL = 1, KDLON |
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IF (NOVLP.EQ.1) THEN |
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c* maximum-random |
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ZCLEAR(JL)=ZCLEAR(JL)*(1.0-MAX(PCLDLD(JL,JK),ZCLOUD(JL))) |
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* /(1.0-MIN(ZCLOUD(JL),1.-ZEPSEC)) |
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ZCLM(JL,JK1,JK) = 1.0 - ZCLEAR(JL) |
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ZCLOUD(JL) = PCLDLD(JL,JK) |
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ELSE IF (NOVLP.EQ.2) THEN |
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c* maximum |
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ZCLOUD(JL) = MAX(ZCLOUD(JL) , PCLDLD(JL,JK)) |
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ZCLM(JL,JK1,JK) = ZCLOUD(JL) |
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ELSE IF (NOVLP.EQ.3) THEN |
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c* random |
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ZCLEAR(JL) = ZCLEAR(JL)*(1.0 - PCLDLD(JL,JK)) |
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ZCLOUD(JL) = 1.0 - ZCLEAR(JL) |
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ZCLM(JL,JK1,JK) = ZCLOUD(JL) |
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END IF |
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252 CONTINUE |
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253 CONTINUE |
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254 CONTINUE |
290 |
C |
291 |
C |
292 |
C |
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C* 3. FLUXES FOR PARTIAL/MULTIPLE LAYERED CLOUDINESS |
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C ---------------------------------------------- |
295 |
C |
296 |
300 CONTINUE |
297 |
C |
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C* 3.1 DOWNWARD FLUXES |
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C --------------- |
300 |
C |
301 |
310 CONTINUE |
302 |
C |
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DO 311 JL = 1, KDLON |
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PFLUX(JL,2,KFLEV+1) = 0. |
305 |
311 CONTINUE |
306 |
C |
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DO 317 JK1 = KFLEV , 1 , -1 |
308 |
C |
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C* CONTRIBUTION FROM CLEAR-SKY FRACTION |
310 |
C |
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DO 312 JL = 1, KDLON |
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ZFD (JL) = (1. - ZCLM(JL,JK1,KFLEV)) * ZDNF(JL,1,JK1) |
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312 CONTINUE |
314 |
C |
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C* CONTRIBUTION FROM ADJACENT CLOUD |
316 |
C |
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DO 313 JL = 1, KDLON |
318 |
ZFD(JL) = ZFD(JL) + ZCLM(JL,JK1,JK1) * ZDNF(JL,JK1+1,JK1) |
319 |
313 CONTINUE |
320 |
C |
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C* CONTRIBUTION FROM OTHER CLOUDY FRACTIONS |
322 |
C |
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DO 315 JK = KFLEV-1 , JK1 , -1 |
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DO 314 JL = 1, KDLON |
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ZCFRAC = ZCLM(JL,JK1,JK+1) - ZCLM(JL,JK1,JK) |
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ZFD(JL) = ZFD(JL) + ZCFRAC * ZDNF(JL,JK+2,JK1) |
327 |
314 CONTINUE |
328 |
315 CONTINUE |
329 |
C |
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DO 316 JL = 1, KDLON |
331 |
PFLUX(JL,2,JK1) = ZFD (JL) |
332 |
316 CONTINUE |
333 |
C |
334 |
317 CONTINUE |
335 |
C |
336 |
C |
337 |
C |
338 |
C |
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C* 3.2 UPWARD FLUX AT THE SURFACE |
340 |
C -------------------------- |
341 |
C |
342 |
320 CONTINUE |
343 |
C |
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DO 321 JL = 1, KDLON |
345 |
PFLUX(JL,1,1) = PEMIS(JL)*PBSUIN(JL)-(1.-PEMIS(JL))*PFLUX(JL,2,1) |
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321 CONTINUE |
347 |
C |
348 |
C |
349 |
C |
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C* 3.3 UPWARD FLUXES |
351 |
C ------------- |
352 |
C |
353 |
330 CONTINUE |
354 |
C |
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DO 337 JK1 = 2 , KFLEV+1 |
356 |
C |
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C* CONTRIBUTION FROM CLEAR-SKY FRACTION |
358 |
C |
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DO 332 JL = 1, KDLON |
360 |
ZFU (JL) = (1. - ZCLM(JL,JK1,1)) * ZUPF(JL,1,JK1) |
361 |
332 CONTINUE |
362 |
C |
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C* CONTRIBUTION FROM ADJACENT CLOUD |
364 |
C |
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DO 333 JL = 1, KDLON |
366 |
ZFU(JL) = ZFU(JL) + ZCLM(JL,JK1,JK1-1) * ZUPF(JL,JK1,JK1) |
367 |
333 CONTINUE |
368 |
C |
369 |
C* CONTRIBUTION FROM OTHER CLOUDY FRACTIONS |
370 |
C |
371 |
DO 335 JK = 2 , JK1-1 |
372 |
DO 334 JL = 1, KDLON |
373 |
ZCFRAC = ZCLM(JL,JK1,JK-1) - ZCLM(JL,JK1,JK) |
374 |
ZFU(JL) = ZFU(JL) + ZCFRAC * ZUPF(JL,JK ,JK1) |
375 |
334 CONTINUE |
376 |
335 CONTINUE |
377 |
C |
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DO 336 JL = 1, KDLON |
379 |
PFLUX(JL,1,JK1) = ZFU (JL) |
380 |
336 CONTINUE |
381 |
C |
382 |
337 CONTINUE |
383 |
C |
384 |
C |
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END IF |
386 |
C |
387 |
C |
388 |
C* 2.3 END OF CLOUD EFFECT COMPUTATIONS |
389 |
C |
390 |
230 CONTINUE |
391 |
C |
392 |
IF (.NOT.LEVOIGT) THEN |
393 |
DO 231 JL = 1, KDLON |
394 |
ZFN10(JL) = PFLUX(JL,1,KLIM) + PFLUX(JL,2,KLIM) |
395 |
231 CONTINUE |
396 |
DO 233 JK = KLIM+1 , KFLEV+1 |
397 |
DO 232 JL = 1, KDLON |
398 |
ZFN10(JL) = ZFN10(JL) + PCTS(JL,JK-1) |
399 |
PFLUX(JL,1,JK) = ZFN10(JL) |
400 |
PFLUX(JL,2,JK) = 0.0 |
401 |
232 CONTINUE |
402 |
233 CONTINUE |
403 |
ENDIF |
404 |
C |
405 |
RETURN |
406 |
END |