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SUBROUTINE lwc(klim, pcldld, pcldlu, pemis, pfluc, pbint, pbsuin, pcts, & |
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pcntrb, 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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|
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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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|
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! EXPLICIT ARGUMENTS : |
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! -------------------- |
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! ==== INPUTS === |
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! PBINT : (KDLON,0:KFLEV) ; HALF LEVEL PLANCK FUNCTION |
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! PBSUIN : (KDLON) ; SURFACE PLANCK FUNCTION |
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! PCLDLD : (KDLON,KFLEV) ; DOWNWARD EFFECTIVE CLOUD FRACTION |
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! PCLDLU : (KDLON,KFLEV) ; UPWARD EFFECTIVE CLOUD FRACTION |
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! PCNTRB : (KDLON,KFLEV+1,KFLEV+1); CLEAR-SKY ENERGY EXCHANGE |
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! PCTS : (KDLON,KFLEV) ; CLEAR-SKY LAYER COOLING-TO-SPACE |
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! PEMIS : (KDLON) ; SURFACE EMISSIVITY |
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! PFLUC |
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! ==== OUTPUTS === |
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! PFLUX(KDLON,2,KFLEV) ; RADIATIVE FLUXES : |
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! 1 ==> UPWARD FLUX TOTAL |
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! 2 ==> DOWNWARD FLUX TOTAL |
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|
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! METHOD. |
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! ------- |
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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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|
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! REFERENCE. |
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! ---------- |
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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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|
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! AUTHOR. |
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! ------- |
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! JEAN-JACQUES MORCRETTE *ECMWF* |
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|
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! MODIFICATIONS. |
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! -------------- |
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! ORIGINAL : 89-07-14 |
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! Voigt lines (loop 231 to 233) - JJM & PhD - 01/96 |
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! ----------------------------------------------------------------------- |
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! * 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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|
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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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|
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DOUBLE PRECISION pflux(kdlon, 2, kflev+1) |
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! ----------------------------------------------------------------------- |
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! * LOCAL VARIABLES: |
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INTEGER imx(kdlon), imxp(kdlon) |
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|
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DOUBLE PRECISION zclear(kdlon), zcloud(kdlon) |
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DOUBLE PRECISION zdnf(kdlon, kflev+1, kflev+1), zfd(kdlon), zfn10(kdlon), & |
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zfu(kdlon), zupf(kdlon, kflev+1, kflev+1) |
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DOUBLE PRECISION zclm(kdlon, kflev+1, kflev+1) |
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|
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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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DOUBLE PRECISION zcfrac |
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! ------------------------------------------------------------------ |
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|
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! * 1. INITIALIZATION |
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! -------------- |
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|
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|
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imaxc = 0 |
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|
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DO 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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END DO |
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|
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! * 1.1 SEARCH THE LAYER INDEX OF THE HIGHEST CLOUD |
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! ------------------------------------------- |
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|
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|
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DO jk = 1, kflev |
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DO jl = 1, kdlon |
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imx1 = imx(jl) |
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imx2 = jk |
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IF (pcldlu(jl,jk)>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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END DO |
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END DO |
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! GM******* |
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imaxc = kflev |
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! GM******* |
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|
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DO jk = 1, kflev + 1 |
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DO 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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END DO |
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END DO |
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|
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! ------------------------------------------------------------------ |
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|
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! * 2. EFFECT OF CLOUDINESS ON LONGWAVE FLUXES |
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! --------------------------------------- |
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|
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IF (imaxc>0) THEN |
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! * 2.0 INITIALIZE TO CLEAR-SKY FLUXES |
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! ------------------------------ |
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|
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|
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DO jk1 = 1, kflev + 1 |
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DO jk2 = 1, kflev + 1 |
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DO 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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END DO |
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END DO |
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END DO |
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|
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! * 2.1 FLUXES FOR ONE OVERCAST UNITY EMISSIVITY CLOUD |
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! ---------------------------------------------- |
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|
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|
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DO jkc = 1, imaxc |
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jcloud = jkc |
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jkcp1 = jcloud + 1 |
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|
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! * 2.1.1 ABOVE THE CLOUD |
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! --------------- |
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|
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|
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DO jk = jkcp1, kflev + 1 |
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jkm1 = jk - 1 |
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DO jl = 1, kdlon |
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zfu(jl) = 0. |
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END DO |
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IF (jk>jkcp1) THEN |
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DO jkj = jkcp1, jkm1 |
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DO jl = 1, kdlon |
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zfu(jl) = zfu(jl) + pcntrb(jl, jk, jkj) |
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END DO |
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END DO |
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END IF |
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|
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DO jl = 1, kdlon |
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zupf(jl, jkcp1, jk) = pbint(jl, jk) - zfu(jl) |
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END DO |
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END DO |
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|
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! * 2.1.2 BELOW THE CLOUD |
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! --------------- |
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|
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|
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DO jk = 1, jcloud |
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jkp1 = jk + 1 |
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DO jl = 1, kdlon |
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zfd(jl) = 0. |
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END DO |
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|
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IF (jk<jcloud) THEN |
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DO jkj = jkp1, jcloud |
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DO jl = 1, kdlon |
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zfd(jl) = zfd(jl) + pcntrb(jl, jk, jkj) |
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END DO |
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END DO |
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END IF |
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DO jl = 1, kdlon |
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zdnf(jl, jkcp1, jk) = -pbint(jl, jk) - zfd(jl) |
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END DO |
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END DO |
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|
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END DO |
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|
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|
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! * 2.2 CLOUD COVER MATRIX |
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! ------------------ |
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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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|
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|
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DO jk1 = 1, kflev + 1 |
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DO jk2 = 1, kflev + 1 |
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DO jl = 1, kdlon |
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zclm(jl, jk1, jk2) = 0. |
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END DO |
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END DO |
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END DO |
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|
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|
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|
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! * 2.4 CLOUD COVER BELOW THE LEVEL OF CALCULATION |
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! ------------------------------------------ |
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|
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|
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DO jk1 = 2, kflev + 1 |
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DO jl = 1, kdlon |
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zclear(jl) = 1. |
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zcloud(jl) = 0. |
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END DO |
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DO jk = jk1 - 1, 1, -1 |
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DO jl = 1, kdlon |
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IF (novlp==1) THEN |
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! * maximum-random |
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zclear(jl) = zclear(jl)*(1.0-max(pcldlu(jl, & |
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jk),zcloud(jl)))/(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==2) THEN |
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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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ELSE IF (novlp==3) THEN |
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! * 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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END DO |
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END DO |
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END DO |
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|
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|
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! * 2.5 CLOUD COVER ABOVE THE LEVEL OF CALCULATION |
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! ------------------------------------------ |
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|
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|
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DO jk1 = 1, kflev |
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DO jl = 1, kdlon |
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zclear(jl) = 1. |
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zcloud(jl) = 0. |
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END DO |
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DO jk = jk1, kflev |
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DO jl = 1, kdlon |
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IF (novlp==1) THEN |
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! * maximum-random |
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zclear(jl) = zclear(jl)*(1.0-max(pcldld(jl, & |
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jk),zcloud(jl)))/(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==2) THEN |
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! * 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==3) THEN |
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! * 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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END DO |
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END DO |
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END DO |
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|
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|
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|
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! * 3. FLUXES FOR PARTIAL/MULTIPLE LAYERED CLOUDINESS |
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! ---------------------------------------------- |
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|
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|
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! * 3.1 DOWNWARD FLUXES |
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! --------------- |
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|
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|
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DO jl = 1, kdlon |
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pflux(jl, 2, kflev+1) = 0. |
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END DO |
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|
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DO jk1 = kflev, 1, -1 |
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|
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! * CONTRIBUTION FROM CLEAR-SKY FRACTION |
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|
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DO jl = 1, kdlon |
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zfd(jl) = (1.-zclm(jl,jk1,kflev))*zdnf(jl, 1, jk1) |
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END DO |
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|
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! * CONTRIBUTION FROM ADJACENT CLOUD |
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|
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DO jl = 1, kdlon |
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zfd(jl) = zfd(jl) + zclm(jl, jk1, jk1)*zdnf(jl, jk1+1, jk1) |
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END DO |
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|
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! * CONTRIBUTION FROM OTHER CLOUDY FRACTIONS |
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|
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DO jk = kflev - 1, jk1, -1 |
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DO 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) |
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END DO |
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END DO |
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|
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DO jl = 1, kdlon |
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pflux(jl, 2, jk1) = zfd(jl) |
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END DO |
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|
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END DO |
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|
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|
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|
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|
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! * 3.2 UPWARD FLUX AT THE SURFACE |
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! -------------------------- |
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|
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|
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DO jl = 1, kdlon |
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pflux(jl, 1, 1) = pemis(jl)*pbsuin(jl) - (1.-pemis(jl))*pflux(jl, 2, 1) |
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END DO |
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|
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|
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|
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! * 3.3 UPWARD FLUXES |
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! ------------- |
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|
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|
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DO jk1 = 2, kflev + 1 |
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|
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! * CONTRIBUTION FROM CLEAR-SKY FRACTION |
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|
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DO jl = 1, kdlon |
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zfu(jl) = (1.-zclm(jl,jk1,1))*zupf(jl, 1, jk1) |
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END DO |
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|
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! * CONTRIBUTION FROM ADJACENT CLOUD |
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|
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DO jl = 1, kdlon |
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zfu(jl) = zfu(jl) + zclm(jl, jk1, jk1-1)*zupf(jl, jk1, jk1) |
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END DO |
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|
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! * CONTRIBUTION FROM OTHER CLOUDY FRACTIONS |
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|
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DO jk = 2, jk1 - 1 |
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DO jl = 1, kdlon |
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zcfrac = zclm(jl, jk1, jk-1) - zclm(jl, jk1, jk) |
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zfu(jl) = zfu(jl) + zcfrac*zupf(jl, jk, jk1) |
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END DO |
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END DO |
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|
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DO jl = 1, kdlon |
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pflux(jl, 1, jk1) = zfu(jl) |
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END DO |
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|
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END DO |
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|
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|
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END IF |
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|
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|
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! * 2.3 END OF CLOUD EFFECT COMPUTATIONS |
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|
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|
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IF (.NOT. levoigt) THEN |
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DO jl = 1, kdlon |
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zfn10(jl) = pflux(jl, 1, klim) + pflux(jl, 2, klim) |
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END DO |
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DO jk = klim + 1, kflev + 1 |
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DO jl = 1, kdlon |
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zfn10(jl) = zfn10(jl) + pcts(jl, jk-1) |
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pflux(jl, 1, jk) = zfn10(jl) |
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pflux(jl, 2, jk) = 0.0 |
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END DO |
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END DO |
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END IF |
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|
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RETURN |
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END SUBROUTINE lwc |