| 1 | SUBROUTINE SWCLR & |
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| 2 | &( KIDIA , KFDIA , KLON , KLEV , KAER , KNU & |
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| 3 | &, PAER , PALBP , PDSIG , PRAYL , PSEC & |
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| 4 | &, PCGAZ , PPIZAZ, PRAY1 , PRAY2 , PREFZ , PRJ & |
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| 5 | &, PRK , PRMU0 , PTAUAZ, PTRA1 , PTRA2 , PTRCLR & |
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| 6 | &) |
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| 7 | |
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| 8 | !**** *SWCLR* - CLEAR-SKY COLUMN COMPUTATIONS |
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| 9 | |
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| 10 | ! PURPOSE. |
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| 11 | ! -------- |
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| 12 | ! COMPUTES THE REFLECTIVITY AND TRANSMISSIVITY IN CASE OF |
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| 13 | ! CLEAR-SKY COLUMN |
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| 14 | |
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| 15 | !** INTERFACE. |
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| 16 | ! ---------- |
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| 17 | |
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| 18 | ! *SWCLR* IS CALLED EITHER FROM *SW1S* |
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| 19 | ! OR FROM *SWNI* |
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| 20 | |
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| 21 | ! IMPLICIT ARGUMENTS : |
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| 22 | ! -------------------- |
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| 23 | |
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| 24 | ! ==== INPUTS === |
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| 25 | ! ==== OUTPUTS === |
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| 26 | |
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| 27 | ! METHOD. |
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| 28 | ! ------- |
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| 29 | |
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| 30 | |
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| 31 | ! EXTERNALS. |
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| 32 | ! ---------- |
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| 33 | |
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| 34 | ! NONE |
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| 35 | |
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| 36 | ! REFERENCE. |
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| 37 | ! ---------- |
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| 38 | |
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| 39 | ! SEE RADIATION'S PART OF THE ECMWF RESEARCH DEPARTMENT |
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| 40 | ! DOCUMENTATION, AND FOUQUART AND BONNEL (1980) |
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| 41 | |
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| 42 | ! AUTHOR. |
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| 43 | ! ------- |
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| 44 | ! JEAN-JACQUES MORCRETTE *ECMWF* |
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| 45 | |
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| 46 | ! MODIFICATIONS. |
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| 47 | ! -------------- |
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| 48 | ! ORIGINAL : 94-11-15 |
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| 49 | ! Modified : 96-03-19 JJM-PhD (loop 107 in absence of aerosols) |
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| 50 | ! JJMorcrette 990128 : sunshine duration |
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| 51 | ! JJMorcrette 990128 : sunshine duration |
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| 52 | ! 99-05-25 JJMorcrette Revised aerosols |
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| 53 | ! JJMorcrette 001218 : 6 spectral intervals |
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| 54 | |
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| 55 | ! ------------------------------------------------------------------ |
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| 56 | |
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| 57 | |
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| 58 | #include "tsmbkind.h" |
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| 59 | |
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| 60 | USE YOESW , ONLY : RTAUA ,RPIZA ,RCGA |
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| 61 | USE YOERAD , ONLY : NOVLP ,NSW |
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| 62 | USE YOERDI , ONLY : REPCLC |
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| 63 | USE YOERDU , ONLY : REPSCT |
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| 64 | |
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| 65 | |
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| 66 | IMPLICIT NONE |
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| 67 | |
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| 68 | |
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| 69 | ! DUMMY INTEGER SCALARS |
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| 70 | INTEGER_M :: KAER |
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| 71 | INTEGER_M :: KFDIA |
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| 72 | INTEGER_M :: KIDIA |
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| 73 | INTEGER_M :: KLEV |
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| 74 | INTEGER_M :: KLON |
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| 75 | INTEGER_M :: KNU |
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| 76 | |
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| 77 | |
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| 78 | |
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| 79 | ! ------------------------------------------------------------------ |
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| 80 | |
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| 81 | !* 0.1 ARGUMENTS |
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| 82 | ! --------- |
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| 83 | |
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| 84 | REAL_B :: PAER(KLON,6,KLEV), PALBP(KLON,NSW)& |
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| 85 | &, PDSIG(KLON,KLEV)& |
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| 86 | &, PRAYL(KLON)& |
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| 87 | &, PSEC(KLON) |
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| 88 | |
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| 89 | REAL_B ::& |
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| 90 | &PCGAZ(KLON,KLEV) & |
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| 91 | &, PPIZAZ(KLON,KLEV)& |
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| 92 | &, PRAY1(KLON,KLEV+1) , PRAY2(KLON,KLEV+1)& |
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| 93 | &, PREFZ(KLON,2,KLEV+1), PRJ(KLON,6,KLEV+1)& |
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| 94 | &, PRK(KLON,6,KLEV+1) , PRMU0(KLON,KLEV+1)& |
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| 95 | &, PTAUAZ(KLON,KLEV)& |
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| 96 | &, PTRA1(KLON,KLEV+1) , PTRA2(KLON,KLEV+1)& |
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| 97 | &, PTRCLR(KLON) |
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| 98 | |
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| 99 | ! ------------------------------------------------------------------ |
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| 100 | |
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| 101 | !* 0.2 LOCAL ARRAYS |
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| 102 | ! ------------ |
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| 103 | |
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| 104 | REAL_B :: ZC0I(KLON,KLEV+1)& |
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| 105 | &, ZCLE0(KLON,KLEV), ZCLEAR(KLON) & |
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| 106 | &, ZR21(KLON)& |
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| 107 | &, ZR23(KLON) , ZSS0(KLON) , ZSCAT(KLON)& |
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| 108 | &, ZTR(KLON,2,KLEV+1) |
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| 109 | |
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| 110 | ! LOCAL INTEGER SCALARS |
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| 111 | INTEGER_M :: IKL, JA, JAE, JAJ, JK, JKL, JKLP1, JKM1, JL, INU1 |
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| 112 | |
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| 113 | ! LOCAL REAL SCALARS |
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| 114 | REAL_B :: ZBMU0, ZBMU1, ZCORAE, ZDEN, ZDEN1, ZFACOA,& |
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| 115 | &ZFF, ZGAP, ZGAR, ZMU1, ZMUE, ZRATIO, ZRE11, & |
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| 116 | &ZTO, ZTRAY, ZWW |
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| 117 | |
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| 118 | |
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| 119 | ! ------------------------------------------------------------------ |
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| 120 | |
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| 121 | !* 1. OPTICAL PARAMETERS FOR AEROSOLS AND RAYLEIGH |
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| 122 | ! -------------------------------------------- |
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| 123 | |
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| 124 | |
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| 125 | DO JK = 1 , KLEV+1 |
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| 126 | DO JA = 1 , 6 |
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| 127 | DO JL = KIDIA,KFDIA |
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| 128 | PRJ(JL,JA,JK) = _ZERO_ |
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| 129 | PRK(JL,JA,JK) = _ZERO_ |
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| 130 | ENDDO |
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| 131 | ENDDO |
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| 132 | ENDDO |
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| 133 | |
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| 134 | ! ------ NB: 'PAER' AEROSOLS ARE ENTERED FROM TOP TO BOTTOM |
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| 135 | |
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| 136 | DO JK = 1 , KLEV |
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| 137 | IKL=KLEV+1-JK |
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| 138 | DO JL = KIDIA,KFDIA |
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| 139 | PCGAZ(JL,JK) = _ZERO_ |
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| 140 | PPIZAZ(JL,JK) = _ZERO_ |
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| 141 | PTAUAZ(JL,JK) = _ZERO_ |
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| 142 | ENDDO |
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| 143 | DO JAE=1,6 |
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| 144 | DO JL = KIDIA,KFDIA |
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| 145 | PTAUAZ(JL,JK)=PTAUAZ(JL,JK)+PAER(JL, JAE, IKL)*RTAUA(KNU,JAE) |
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| 146 | PPIZAZ(JL,JK)=PPIZAZ(JL,JK)+PAER(JL, JAE, IKL)& |
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| 147 | &* RTAUA(KNU,JAE)*RPIZA(KNU,JAE) |
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| 148 | PCGAZ(JL,JK) = PCGAZ(JL,JK) +PAER(JL, JAE, IKL)& |
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| 149 | &* RTAUA(KNU,JAE)*RPIZA(KNU,JAE)*RCGA(KNU,JAE) |
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| 150 | ENDDO |
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| 151 | ENDDO |
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| 152 | |
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| 153 | DO JL = KIDIA,KFDIA |
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| 154 | IF (KAER /= 0) THEN |
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| 155 | PCGAZ(JL,JK)=PCGAZ(JL,JK)/PPIZAZ(JL,JK) |
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| 156 | PPIZAZ(JL,JK)=PPIZAZ(JL,JK)/PTAUAZ(JL,JK) |
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| 157 | ZTRAY = PRAYL(JL) * PDSIG(JL,JK) |
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| 158 | ZRATIO = ZTRAY / (ZTRAY + PTAUAZ(JL,JK)) |
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| 159 | ZGAR = PCGAZ(JL,JK) |
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| 160 | ZFF = ZGAR * ZGAR |
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| 161 | PTAUAZ(JL,JK)=ZTRAY+PTAUAZ(JL,JK)*(_ONE_-PPIZAZ(JL,JK)*ZFF) |
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| 162 | PCGAZ(JL,JK) = ZGAR * (_ONE_ - ZRATIO) / (_ONE_ + ZGAR) |
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| 163 | PPIZAZ(JL,JK) =ZRATIO+(_ONE_-ZRATIO)*PPIZAZ(JL,JK)*(_ONE_-ZFF)& |
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| 164 | &/ (_ONE_ - PPIZAZ(JL,JK) * ZFF) |
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| 165 | ELSE |
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| 166 | ZTRAY = PRAYL(JL) * PDSIG(JL,JK) |
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| 167 | PTAUAZ(JL,JK) = ZTRAY |
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| 168 | PCGAZ(JL,JK) = _ZERO_ |
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| 169 | PPIZAZ(JL,JK) = _ONE_-REPSCT |
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| 170 | ENDIF |
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| 171 | ENDDO |
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| 172 | ENDDO |
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| 173 | |
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| 174 | ! ------------------------------------------------------------------ |
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| 175 | |
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| 176 | !* 2. TOTAL EFFECTIVE CLOUDINESS ABOVE A GIVEN LEVEL |
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| 177 | ! ---------------------------------------------- |
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| 178 | |
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| 179 | |
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| 180 | DO JL = KIDIA,KFDIA |
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| 181 | ZR23(JL) = _ZERO_ |
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| 182 | ZC0I(JL,KLEV+1) = _ZERO_ |
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| 183 | ZCLEAR(JL) = _ONE_ |
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| 184 | ZSCAT(JL) = _ZERO_ |
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| 185 | ENDDO |
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| 186 | |
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| 187 | JK = 1 |
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| 188 | JKL = KLEV+1 - JK |
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| 189 | JKLP1 = JKL + 1 |
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| 190 | DO JL = KIDIA,KFDIA |
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| 191 | ZFACOA = _ONE_ - PPIZAZ(JL,JKL)*PCGAZ(JL,JKL)*PCGAZ(JL,JKL) |
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| 192 | ZCORAE = ZFACOA * PTAUAZ(JL,JKL) * PSEC(JL) |
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| 193 | ZR21(JL) = EXP(-ZCORAE ) |
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| 194 | ZSS0(JL) = _ONE_-ZR21(JL) |
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| 195 | ZCLE0(JL,JKL) = ZSS0(JL) |
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| 196 | |
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| 197 | IF (NOVLP == 1 .OR. NOVLP == 4) THEN |
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| 198 | !* maximum-random |
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| 199 | ZCLEAR(JL) = ZCLEAR(JL)& |
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| 200 | &*(_ONE_-MAX(ZSS0(JL),ZSCAT(JL)))& |
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| 201 | &/(_ONE_-MIN(ZSCAT(JL),_ONE_-REPCLC)) |
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| 202 | ZC0I(JL,JKL) = _ONE_ - ZCLEAR(JL) |
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| 203 | ZSCAT(JL) = ZSS0(JL) |
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| 204 | ELSEIF (NOVLP == 2) THEN |
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| 205 | !* maximum |
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| 206 | ZSCAT(JL) = MAX( ZSS0(JL) , ZSCAT(JL) ) |
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| 207 | ZC0I(JL,JKL) = ZSCAT(JL) |
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| 208 | ELSEIF (NOVLP == 3) THEN |
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| 209 | !* random |
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| 210 | ZCLEAR(JL)=ZCLEAR(JL)*(_ONE_-ZSS0(JL)) |
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| 211 | ZSCAT(JL) = _ONE_ - ZCLEAR(JL) |
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| 212 | ZC0I(JL,JKL) = ZSCAT(JL) |
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| 213 | ENDIF |
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| 214 | ENDDO |
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| 215 | |
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| 216 | DO JK = 2 , KLEV |
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| 217 | JKL = KLEV+1 - JK |
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| 218 | JKLP1 = JKL + 1 |
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| 219 | DO JL = KIDIA,KFDIA |
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| 220 | ZFACOA = _ONE_ - PPIZAZ(JL,JKL)*PCGAZ(JL,JKL)*PCGAZ(JL,JKL) |
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| 221 | ZCORAE = ZFACOA * PTAUAZ(JL,JKL) * PSEC(JL) |
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| 222 | ZR21(JL) = EXP(-ZCORAE ) |
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| 223 | ZSS0(JL) = _ONE_-ZR21(JL) |
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| 224 | ZCLE0(JL,JKL) = ZSS0(JL) |
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| 225 | |
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| 226 | IF (NOVLP == 1 .OR. NOVLP == 4) THEN |
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| 227 | !* maximum-random |
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| 228 | ZCLEAR(JL) = ZCLEAR(JL)& |
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| 229 | &*(_ONE_-MAX(ZSS0(JL),ZSCAT(JL)))& |
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| 230 | &/(_ONE_-MIN(ZSCAT(JL),_ONE_-REPCLC)) |
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| 231 | ZC0I(JL,JKL) = _ONE_ - ZCLEAR(JL) |
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| 232 | ZSCAT(JL) = ZSS0(JL) |
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| 233 | ELSEIF (NOVLP == 2) THEN |
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| 234 | !* maximum |
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| 235 | ZSCAT(JL) = MAX( ZSS0(JL) , ZSCAT(JL) ) |
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| 236 | ZC0I(JL,JKL) = ZSCAT(JL) |
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| 237 | ELSEIF (NOVLP == 3) THEN |
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| 238 | !* random |
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| 239 | ZCLEAR(JL)=ZCLEAR(JL)*(_ONE_-ZSS0(JL)) |
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| 240 | ZSCAT(JL) = _ONE_ - ZCLEAR(JL) |
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| 241 | ZC0I(JL,JKL) = ZSCAT(JL) |
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| 242 | ENDIF |
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| 243 | ENDDO |
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| 244 | ENDDO |
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| 245 | |
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| 246 | ! ------------------------------------------------------------------ |
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| 247 | |
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| 248 | !* 3. REFLECTIVITY/TRANSMISSIVITY FOR PURE SCATTERING |
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| 249 | ! ----------------------------------------------- |
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| 250 | |
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| 251 | |
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| 252 | DO JL = KIDIA,KFDIA |
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| 253 | PRAY1(JL,KLEV+1) = _ZERO_ |
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| 254 | PRAY2(JL,KLEV+1) = _ZERO_ |
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| 255 | PREFZ(JL,2,1) = PALBP(JL,KNU) |
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| 256 | PREFZ(JL,1,1) = PALBP(JL,KNU) |
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| 257 | PTRA1(JL,KLEV+1) = _ONE_ |
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| 258 | PTRA2(JL,KLEV+1) = _ONE_ |
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| 259 | ENDDO |
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| 260 | |
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| 261 | DO JK = 2 , KLEV+1 |
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| 262 | JKM1 = JK-1 |
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| 263 | DO JL = KIDIA,KFDIA |
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| 264 | |
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| 265 | |
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| 266 | ! ------------------------------------------------------------------ |
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| 267 | |
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| 268 | !* 3.1 EQUIVALENT ZENITH ANGLE |
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| 269 | ! ----------------------- |
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| 270 | |
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| 271 | |
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| 272 | ZMUE = (_ONE_-ZC0I(JL,JK)) * PSEC(JL)+ ZC0I(JL,JK) * 1.66_JPRB |
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| 273 | PRMU0(JL,JK) = _ONE_/ZMUE |
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| 274 | |
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| 275 | |
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| 276 | ! ------------------------------------------------------------------ |
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| 277 | |
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| 278 | !* 3.2 REFLECT./TRANSMISSIVITY DUE TO RAYLEIGH AND AEROSOLS |
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| 279 | ! ---------------------------------------------------- |
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| 280 | |
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| 281 | |
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| 282 | ZGAP = PCGAZ(JL,JKM1) |
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| 283 | ZBMU0 = _HALF_ - 0.75_JPRB * ZGAP / ZMUE |
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| 284 | ZWW = PPIZAZ(JL,JKM1) |
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| 285 | ZTO = PTAUAZ(JL,JKM1) |
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| 286 | ZDEN = _ONE_ + (_ONE_ - ZWW + ZBMU0 * ZWW) * ZTO * ZMUE & |
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| 287 | &+ (1-ZWW) * (_ONE_ - ZWW +_TWO_*ZBMU0*ZWW)*ZTO*ZTO*ZMUE*ZMUE |
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| 288 | PRAY1(JL,JKM1) = ZBMU0 * ZWW * ZTO * ZMUE / ZDEN |
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| 289 | PTRA1(JL,JKM1) = _ONE_ / ZDEN |
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| 290 | |
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| 291 | ZMU1 = _HALF_ |
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| 292 | ZBMU1 = _HALF_ - 0.75_JPRB * ZGAP * ZMU1 |
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| 293 | ZDEN1= _ONE_ + (_ONE_ - ZWW + ZBMU1 * ZWW) * ZTO / ZMU1 & |
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| 294 | &+ (1-ZWW) * (_ONE_ - ZWW +_TWO_*ZBMU1*ZWW)*ZTO*ZTO/ZMU1/ZMU1 |
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| 295 | PRAY2(JL,JKM1) = ZBMU1 * ZWW * ZTO / ZMU1 / ZDEN1 |
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| 296 | PTRA2(JL,JKM1) = _ONE_ / ZDEN1 |
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| 297 | |
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| 298 | |
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| 299 | |
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| 300 | PREFZ(JL,1,JK) = (PRAY1(JL,JKM1)& |
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| 301 | &+ PREFZ(JL,1,JKM1) * PTRA1(JL,JKM1)& |
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| 302 | &* PTRA2(JL,JKM1)& |
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| 303 | &/ (_ONE_-PRAY2(JL,JKM1)*PREFZ(JL,1,JKM1))) |
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| 304 | |
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| 305 | ZTR(JL,1,JKM1) = (PTRA1(JL,JKM1)& |
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| 306 | &/ (_ONE_-PRAY2(JL,JKM1)*PREFZ(JL,1,JKM1))) |
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| 307 | |
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| 308 | PREFZ(JL,2,JK) = (PRAY1(JL,JKM1)& |
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| 309 | &+ PREFZ(JL,2,JKM1) * PTRA1(JL,JKM1)& |
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| 310 | &* PTRA2(JL,JKM1) ) |
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| 311 | |
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| 312 | ZTR(JL,2,JKM1) = PTRA1(JL,JKM1) |
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| 313 | |
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| 314 | ENDDO |
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| 315 | ENDDO |
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| 316 | DO JL = KIDIA,KFDIA |
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| 317 | ZMUE = (_ONE_-ZC0I(JL,1))*PSEC(JL)+ZC0I(JL,1)*1.66_JPRB |
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| 318 | PRMU0(JL,1)=_ONE_/ZMUE |
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| 319 | PTRCLR(JL)=_ONE_-ZC0I(JL,1) |
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| 320 | ENDDO |
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| 321 | |
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| 322 | |
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| 323 | ! ------------------------------------------------------------------ |
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| 324 | |
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| 325 | !* 3.5 REFLECT./TRANSMISSIVITY BETWEEN SURFACE AND LEVEL |
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| 326 | ! ------------------------------------------------- |
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| 327 | |
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| 328 | IF (NSW <= 4) THEN |
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| 329 | INU1=1 |
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| 330 | ELSE IF (NSW == 6) THEN |
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| 331 | INU1=3 |
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| 332 | END IF |
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| 333 | |
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| 334 | IF (KNU <= INU1) THEN |
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| 335 | JAJ = 2 |
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| 336 | DO JL = KIDIA,KFDIA |
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| 337 | PRJ(JL,JAJ,KLEV+1) = _ONE_ |
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| 338 | PRK(JL,JAJ,KLEV+1) = PREFZ(JL, 1,KLEV+1) |
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| 339 | ENDDO |
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| 340 | |
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| 341 | DO JK = 1 , KLEV |
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| 342 | JKL = KLEV+1 - JK |
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| 343 | JKLP1 = JKL + 1 |
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| 344 | DO JL = KIDIA,KFDIA |
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| 345 | ZRE11= PRJ(JL,JAJ,JKLP1) * ZTR(JL, 1,JKL) |
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| 346 | PRJ(JL,JAJ,JKL) = ZRE11 |
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| 347 | PRK(JL,JAJ,JKL) = ZRE11 * PREFZ(JL, 1,JKL) |
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| 348 | ENDDO |
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| 349 | ENDDO |
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| 350 | |
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| 351 | ELSE |
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| 352 | |
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| 353 | DO JAJ = 1 , 2 |
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| 354 | DO JL = KIDIA,KFDIA |
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| 355 | PRJ(JL,JAJ,KLEV+1) = _ONE_ |
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| 356 | PRK(JL,JAJ,KLEV+1) = PREFZ(JL,JAJ,KLEV+1) |
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| 357 | ENDDO |
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| 358 | |
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| 359 | DO JK = 1 , KLEV |
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| 360 | JKL = KLEV+1 - JK |
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| 361 | JKLP1 = JKL + 1 |
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| 362 | DO JL = KIDIA,KFDIA |
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| 363 | ZRE11= PRJ(JL,JAJ,JKLP1) * ZTR(JL,JAJ,JKL) |
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| 364 | PRJ(JL,JAJ,JKL) = ZRE11 |
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| 365 | PRK(JL,JAJ,JKL) = ZRE11 * PREFZ(JL,JAJ,JKL) |
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| 366 | ENDDO |
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| 367 | ENDDO |
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| 368 | ENDDO |
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| 369 | |
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| 370 | ENDIF |
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| 371 | |
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| 372 | ! ------------------------------------------------------------------ |
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| 373 | |
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| 374 | RETURN |
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| 375 | END SUBROUTINE SWCLR |
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