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SUBROUTINE swclr(knu, paer, flag_aer, tauae, pizae, cgae, palbp, pdsig, & |
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prayl, psec, pcgaz, ppizaz, pray1, pray2, prefz, prj, prk, prmu0, ptauaz, & |
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ptra1, ptra2) |
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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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! ------------------------------------------------------------------ |
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! PURPOSE. |
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! -------- |
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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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! ---------- |
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|
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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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! ------- |
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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 : 94-11-15 |
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! ------------------------------------------------------------------ |
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! * ARGUMENTS: |
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|
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INTEGER knu |
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! -OB |
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DOUBLE PRECISION flag_aer |
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DOUBLE PRECISION tauae(kdlon, kflev, 2) |
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DOUBLE PRECISION pizae(kdlon, kflev, 2) |
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DOUBLE PRECISION cgae(kdlon, kflev, 2) |
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DOUBLE PRECISION paer(kdlon, kflev, 5) |
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DOUBLE PRECISION palbp(kdlon, 2) |
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DOUBLE PRECISION pdsig(kdlon, kflev) |
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DOUBLE PRECISION prayl(kdlon) |
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DOUBLE PRECISION psec(kdlon) |
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|
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DOUBLE PRECISION pcgaz(kdlon, kflev) |
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DOUBLE PRECISION 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 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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|
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DOUBLE PRECISION zc0i(kdlon, kflev+1) |
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DOUBLE PRECISION zcle0(kdlon, kflev) |
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DOUBLE PRECISION zclear(kdlon) |
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DOUBLE PRECISION zr21(kdlon) |
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DOUBLE PRECISION zr23(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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|
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INTEGER jl, jk, ja, jae, jkl, jklp1, jaj, jkm1, in |
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DOUBLE PRECISION ztray, zgar, zratio, zff, 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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|
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! * Prescribed Data for Aerosols: |
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|
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DOUBLE PRECISION taua(2, 5), rpiza(2, 5), rcga(2, 5) |
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SAVE taua, rpiza, rcga |
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DATA ((taua(in,ja),ja=1,5), in=1, 2)/.730719, .912819, .725059, .745405, & |
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.682188, .730719, .912819, .725059, .745405, .682188/ |
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DATA ((rpiza(in,ja),ja=1,5), in=1, 2)/.872212, .982545, .623143, .944887, & |
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.997975, .872212, .982545, .623143, .944887, .997975/ |
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DATA ((rcga(in,ja),ja=1,5), in=1, 2)/.647596, .739002, .580845, .662657, & |
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.624246, .647596, .739002, .580845, .662657, .624246/ |
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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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|
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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) = 0. |
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prk(jl, ja, jk) = 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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DO jk = 1, kflev |
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! -OB |
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! DO 104 JL = 1, KDLON |
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! PCGAZ(JL,JK) = 0. |
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! PPIZAZ(JL,JK) = 0. |
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! PTAUAZ(JL,JK) = 0. |
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! 104 CONTINUE |
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! -OB |
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! DO 106 JAE=1,5 |
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! DO 105 JL = 1, KDLON |
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! PTAUAZ(JL,JK)=PTAUAZ(JL,JK) |
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! S +PAER(JL,JK,JAE)*TAUA(KNU,JAE) |
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! PPIZAZ(JL,JK)=PPIZAZ(JL,JK)+PAER(JL,JK,JAE) |
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! S * TAUA(KNU,JAE)*RPIZA(KNU,JAE) |
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! PCGAZ(JL,JK) = PCGAZ(JL,JK) +PAER(JL,JK,JAE) |
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! S * TAUA(KNU,JAE)*RPIZA(KNU,JAE)*RCGA(KNU,JAE) |
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! 105 CONTINUE |
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! 106 CONTINUE |
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! -OB |
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DO jl = 1, kdlon |
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ptauaz(jl, jk) = flag_aer*tauae(jl, jk, knu) |
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ppizaz(jl, jk) = flag_aer*pizae(jl, jk, knu) |
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pcgaz(jl, jk) = flag_aer*cgae(jl, jk, knu) |
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END DO |
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|
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IF (flag_aer>0) THEN |
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! -OB |
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DO jl = 1, kdlon |
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! PCGAZ(JL,JK)=PCGAZ(JL,JK)/PPIZAZ(JL,JK) |
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! PPIZAZ(JL,JK)=PPIZAZ(JL,JK)/PTAUAZ(JL,JK) |
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ztray = prayl(jl)*pdsig(jl, jk) |
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zratio = ztray/(ztray+ptauaz(jl,jk)) |
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zgar = pcgaz(jl, jk) |
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zff = zgar*zgar |
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ptauaz(jl, jk) = ztray + ptauaz(jl, jk)*(1.-ppizaz(jl,jk)*zff) |
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pcgaz(jl, jk) = zgar*(1.-zratio)/(1.+zgar) |
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ppizaz(jl, jk) = zratio + (1.-zratio)*ppizaz(jl, jk)*(1.-zff)/(1.- & |
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ppizaz(jl,jk)*zff) |
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END DO |
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ELSE |
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DO jl = 1, kdlon |
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ztray = prayl(jl)*pdsig(jl, jk) |
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ptauaz(jl, jk) = ztray |
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pcgaz(jl, jk) = 0. |
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ppizaz(jl, jk) = 1. - repsct |
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END DO |
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END IF ! check flag_aer |
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! 107 CONTINUE |
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! PRINT 9107,JK,((PAER(JL,JK,JAE),JAE=1,5) |
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! $ ,PTAUAZ(JL,JK),PPIZAZ(JL,JK),PCGAZ(JL,JK),JL=1,KDLON) |
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! 9107 FORMAT(1X,'SWCLR_107',I3,8E12.5) |
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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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! * 2. TOTAL EFFECTIVE CLOUDINESS ABOVE A GIVEN LEVEL |
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! ---------------------------------------------- |
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|
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|
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DO jl = 1, kdlon |
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zr23(jl) = 0. |
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zc0i(jl, kflev+1) = 0. |
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zclear(jl) = 1. |
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zscat(jl) = 0. |
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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 = 1. - ppizaz(jl, jkl)*pcgaz(jl, jkl)*pcgaz(jl, jkl) |
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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) = 1. - zr21(jl) |
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zcle0(jl, jkl) = zss0(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)*(1.0-max(zss0(jl),zscat(jl)))/ & |
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(1.0-min(zscat(jl),1.-zepsec)) |
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zc0i(jl, jkl) = 1.0 - 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)*(1.0-zss0(jl)) |
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zscat(jl) = 1.0 - 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 = 1. - ppizaz(jl, jkl)*pcgaz(jl, jkl)*pcgaz(jl, jkl) |
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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) = 1. - zr21(jl) |
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zcle0(jl, jkl) = zss0(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)*(1.0-max(zss0(jl),zscat(jl)))/ & |
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(1.0-min(zscat(jl),1.-zepsec)) |
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zc0i(jl, jkl) = 1.0 - 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)*(1.0-zss0(jl)) |
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zscat(jl) = 1.0 - 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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! ------------------------------------------------------------------ |
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|
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! * 3. REFLECTIVITY/TRANSMISSIVITY FOR PURE SCATTERING |
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! ----------------------------------------------- |
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|
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|
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DO jl = 1, kdlon |
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pray1(jl, kflev+1) = 0. |
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pray2(jl, kflev+1) = 0. |
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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) = 1. |
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ptra2(jl, kflev+1) = 1. |
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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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|
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! ------------------------------------------------------------------ |
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|
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! * 3.1 EQUIVALENT ZENITH ANGLE |
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! ----------------------- |
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|
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|
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zmue = (1.-zc0i(jl,jk))*psec(jl) + zc0i(jl, jk)*1.66 |
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prmu0(jl, jk) = 1./zmue |
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|
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|
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! ------------------------------------------------------------------ |
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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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|
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|
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zgap = pcgaz(jl, jkm1) |
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zbmu0 = 0.5 - 0.75*zgap/zmue |
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zww = ppizaz(jl, jkm1) |
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zto = ptauaz(jl, jkm1) |
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zden = 1. + (1.-zww+zbmu0*zww)*zto*zmue + (1-zww)*(1.-zww+2.*zbmu0*zww) & |
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*zto*zto*zmue*zmue |
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pray1(jl, jkm1) = zbmu0*zww*zto*zmue/zden |
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ptra1(jl, jkm1) = 1./zden |
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|
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zmu1 = 0.5 |
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zbmu1 = 0.5 - 0.75*zgap*zmu1 |
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zden1 = 1. + (1.-zww+zbmu1*zww)*zto/zmu1 + (1-zww)*(1.-zww+2.*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) = 1./zden1 |
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|
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|
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|
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prefz(jl, 1, jk) = (pray1(jl,jkm1)+prefz(jl,1,jkm1)*ptra1(jl,jkm1)* & |
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ptra2(jl,jkm1)/(1.-pray2(jl,jkm1)*prefz(jl,1,jkm1))) |
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|
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ztr(jl, 1, jkm1) = (ptra1(jl,jkm1)/(1.-pray2(jl,jkm1)*prefz(jl,1, & |
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jkm1))) |
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|
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prefz(jl, 2, jk) = (pray1(jl,jkm1)+prefz(jl,2,jkm1)*ptra1(jl,jkm1)* & |
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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 = (1.-zc0i(jl,1))*psec(jl) + zc0i(jl, 1)*1.66 |
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prmu0(jl, 1) = 1./zmue |
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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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! * 3.5 REFLECT./TRANSMISSIVITY BETWEEN SURFACE AND LEVEL |
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! ------------------------------------------------- |
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|
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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) = 1. |
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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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|
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ELSE |
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|
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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) = 1. |
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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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|
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END IF |
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|
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! ------------------------------------------------------------------ |
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|
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RETURN |
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END SUBROUTINE swclr |
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