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module swclr_m |
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IMPLICIT NONE |
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|
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contains |
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SUBROUTINE swclr(knu, palbp, pdsig, prayl, psec, ppizaz, pray1, pray2, & |
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prefz, prj, prk, prmu0, ptauaz, ptra1, ptra2) |
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|
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! PURPOSE. |
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! COMPUTES THE REFLECTIVITY AND TRANSMISSIVITY IN CASE OF |
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! CLEAR-SKY COLUMN |
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|
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! REFERENCE. |
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! SEE RADIATION'S PART OF THE ECMWF RESEARCH DEPARTMENT |
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! DOCUMENTATION, AND FOUQUART AND BONNEL (1980) |
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|
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! AUTHOR. |
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! JEAN-JACQUES MORCRETTE *ECMWF* |
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|
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! MODIFICATIONS. |
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! ORIGINAL : 94-11-15 |
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|
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USE raddim, only: kdlon, kflev |
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USE radepsi, only: zepsec |
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USE radopt, only: novlp |
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|
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! ARGUMENTS: |
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|
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INTEGER knu |
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DOUBLE PRECISION palbp(kdlon, 2) |
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DOUBLE PRECISION, intent(in):: pdsig(kdlon, kflev) |
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DOUBLE PRECISION, intent(in):: prayl(kdlon) |
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DOUBLE PRECISION psec(kdlon) |
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|
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DOUBLE PRECISION, intent(out):: ppizaz(kdlon, kflev) |
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DOUBLE PRECISION pray1(kdlon, kflev + 1) |
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DOUBLE PRECISION pray2(kdlon, kflev + 1) |
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DOUBLE PRECISION prefz(kdlon, 2, kflev + 1) |
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DOUBLE PRECISION prj(kdlon, 6, kflev + 1) |
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DOUBLE PRECISION prk(kdlon, 6, kflev + 1) |
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DOUBLE PRECISION prmu0(kdlon, kflev + 1) |
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DOUBLE PRECISION, intent(out):: ptauaz(kdlon, kflev) |
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DOUBLE PRECISION ptra1(kdlon, kflev + 1) |
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DOUBLE PRECISION ptra2(kdlon, kflev + 1) |
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|
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! LOCAL VARIABLES: |
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DOUBLE PRECISION zc0i(kdlon, kflev + 1) |
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DOUBLE PRECISION zclear(kdlon) |
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DOUBLE PRECISION zr21(kdlon) |
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DOUBLE PRECISION zss0(kdlon) |
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DOUBLE PRECISION zscat(kdlon) |
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DOUBLE PRECISION ztr(kdlon, 2, kflev + 1) |
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INTEGER jl, jk, ja, jkl, jklp1, jaj, jkm1 |
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DOUBLE PRECISION zfacoa, zcorae |
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DOUBLE PRECISION zmue, zgap, zww, zto, zden, zmu1, zden1 |
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DOUBLE PRECISION zbmu0, zbmu1, zre11 |
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double precision, parameter:: REPSCT = 1d-10 |
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|
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!------------------------------------------------------------------ |
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|
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! 1. OPTICAL PARAMETERS FOR AEROSOLS AND RAYLEIGH |
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|
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DO jk = 1, kflev + 1 |
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DO ja = 1, 6 |
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DO jl = 1, kdlon |
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prj(jl, ja, jk) = 0d0 |
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prk(jl, ja, jk) = 0d0 |
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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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DO jk = 1, kflev |
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DO jl = 1, kdlon |
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ptauaz(jl, jk) = prayl(jl) * pdsig(jl, jk) |
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ppizaz(jl, jk) = 1d0 - repsct |
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END DO |
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END DO |
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|
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! 2. TOTAL EFFECTIVE CLOUDINESS ABOVE A GIVEN LEVEL |
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|
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DO jl = 1, kdlon |
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zc0i(jl, kflev + 1) = 0d0 |
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zclear(jl) = 1d0 |
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zscat(jl) = 0d0 |
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END DO |
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|
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jk = 1 |
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jkl = kflev + 1 - jk |
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jklp1 = jkl + 1 |
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DO jl = 1, kdlon |
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zfacoa = 1d0 |
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zcorae = zfacoa * ptauaz(jl, jkl) * psec(jl) |
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zr21(jl) = exp(- zcorae) |
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zss0(jl) = 1d0 - zr21(jl) |
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|
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IF (novlp == 1) THEN |
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! maximum-random |
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zclear(jl) = zclear(jl) * (1d0 - max(zss0(jl), zscat(jl))) / (1d0 & |
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- min(zscat(jl), 1d0 - zepsec)) |
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zc0i(jl, jkl) = 1d0 - zclear(jl) |
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zscat(jl) = zss0(jl) |
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ELSE IF (novlp == 2) THEN |
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! maximum |
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zscat(jl) = max(zss0(jl), zscat(jl)) |
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zc0i(jl, jkl) = zscat(jl) |
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ELSE IF (novlp == 3) THEN |
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! random |
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zclear(jl) = zclear(jl) * (1d0 - zss0(jl)) |
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zscat(jl) = 1d0 - zclear(jl) |
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zc0i(jl, jkl) = zscat(jl) |
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END IF |
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END DO |
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|
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DO jk = 2, kflev |
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jkl = kflev + 1 - jk |
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jklp1 = jkl + 1 |
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DO jl = 1, kdlon |
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zfacoa = 1d0 |
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zcorae = zfacoa * ptauaz(jl, jkl) * psec(jl) |
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zr21(jl) = exp(- zcorae) |
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zss0(jl) = 1d0 - zr21(jl) |
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|
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IF (novlp == 1) THEN |
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! maximum-random |
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zclear(jl) = zclear(jl) * (1d0 - max(zss0(jl), zscat(jl))) & |
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/ (1d0 - min(zscat(jl), 1d0 - zepsec)) |
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zc0i(jl, jkl) = 1d0 - zclear(jl) |
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zscat(jl) = zss0(jl) |
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ELSE IF (novlp == 2) THEN |
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! maximum |
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zscat(jl) = max(zss0(jl), zscat(jl)) |
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zc0i(jl, jkl) = zscat(jl) |
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ELSE IF (novlp == 3) THEN |
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! random |
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zclear(jl) = zclear(jl) * (1d0 - zss0(jl)) |
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zscat(jl) = 1d0 - zclear(jl) |
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zc0i(jl, jkl) = zscat(jl) |
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END IF |
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END DO |
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END DO |
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|
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! 3. REFLECTIVITY/TRANSMISSIVITY FOR PURE SCATTERING |
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|
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DO jl = 1, kdlon |
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pray1(jl, kflev + 1) = 0d0 |
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pray2(jl, kflev + 1) = 0d0 |
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prefz(jl, 2, 1) = palbp(jl, knu) |
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prefz(jl, 1, 1) = palbp(jl, knu) |
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ptra1(jl, kflev + 1) = 1d0 |
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ptra2(jl, kflev + 1) = 1d0 |
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END DO |
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|
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DO jk = 2, kflev + 1 |
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jkm1 = jk - 1 |
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DO jl = 1, kdlon |
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|
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! 3.1 EQUIVALENT ZENITH ANGLE |
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|
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zmue = (1d0 - zc0i(jl, jk)) * psec(jl) + zc0i(jl, jk) * 1.66d0 |
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prmu0(jl, jk) = 1d0 / zmue |
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|
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! 3.2 REFLECT./TRANSMISSIVITY DUE TO RAYLEIGH AND AEROSOLS |
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|
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zgap = 0d0 |
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zbmu0 = 0.5d0 - 0.75d0 * zgap / zmue |
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zww = ppizaz(jl, jkm1) |
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zto = ptauaz(jl, jkm1) |
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zden = 1d0 + (1d0 - zww + zbmu0 * zww) * zto * zmue + (1d0 - zww) & |
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* (1d0 - zww + 2d0 * zbmu0 * zww) * zto * zto * zmue * zmue |
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pray1(jl, jkm1) = zbmu0 * zww * zto * zmue / zden |
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ptra1(jl, jkm1) = 1d0 / zden |
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|
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zmu1 = 0.5d0 |
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zbmu1 = 0.5d0 - 0.75d0 * zgap * zmu1 |
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zden1 = 1d0 + (1d0 - zww + zbmu1 * zww) * zto / zmu1 + (1d0 - zww) & |
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* (1d0 - zww + 2d0 * zbmu1 * zww & |
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) * zto * zto / zmu1 / zmu1 |
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pray2(jl, jkm1) = zbmu1 * zww * zto / zmu1 / zden1 |
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ptra2(jl, jkm1) = 1d0 / zden1 |
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|
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prefz(jl, 1, jk) = (pray1(jl, jkm1) + prefz(jl, 1, jkm1) & |
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* ptra1(jl, jkm1)* ptra2(jl, jkm1) / (1d0 - pray2(jl, jkm1) & |
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* prefz(jl, 1, jkm1))) |
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|
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ztr(jl, 1, jkm1) = (ptra1(jl, jkm1) / (1d0 - pray2(jl, jkm1) & |
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* prefz(jl, 1, jkm1))) |
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|
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prefz(jl, 2, jk) = (pray1(jl, jkm1) + prefz(jl, 2, jkm1) & |
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* ptra1(jl, jkm1) * ptra2(jl, jkm1)) |
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|
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ztr(jl, 2, jkm1) = ptra1(jl, jkm1) |
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|
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END DO |
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END DO |
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DO jl = 1, kdlon |
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zmue = (1d0 - zc0i(jl, 1)) * psec(jl) + zc0i(jl, 1) * 1.66d0 |
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prmu0(jl, 1) = 1d0 / zmue |
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END DO |
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|
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! 3.5 REFLECT./TRANSMISSIVITY BETWEEN SURFACE AND LEVEL |
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|
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IF (knu == 1) THEN |
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jaj = 2 |
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DO jl = 1, kdlon |
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prj(jl, jaj, kflev + 1) = 1d0 |
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prk(jl, jaj, kflev + 1) = prefz(jl, 1, kflev + 1) |
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END DO |
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|
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DO jk = 1, kflev |
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jkl = kflev + 1 - jk |
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jklp1 = jkl + 1 |
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DO jl = 1, kdlon |
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zre11 = prj(jl, jaj, jklp1) * ztr(jl, 1, jkl) |
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prj(jl, jaj, jkl) = zre11 |
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prk(jl, jaj, jkl) = zre11 * prefz(jl, 1, jkl) |
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END DO |
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END DO |
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ELSE |
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DO jaj = 1, 2 |
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DO jl = 1, kdlon |
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prj(jl, jaj, kflev + 1) = 1d0 |
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prk(jl, jaj, kflev + 1) = prefz(jl, jaj, kflev + 1) |
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END DO |
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|
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DO jk = 1, kflev |
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jkl = kflev + 1 - jk |
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jklp1 = jkl + 1 |
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DO jl = 1, kdlon |
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zre11 = prj(jl, jaj, jklp1) * ztr(jl, jaj, jkl) |
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prj(jl, jaj, jkl) = zre11 |
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prk(jl, jaj, jkl) = zre11 * prefz(jl, jaj, jkl) |
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END DO |
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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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END SUBROUTINE swclr |
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|
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end module swclr_m |
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