| 1 | SUBROUTINE LWC & |
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| 2 | &( KIDIA , KFDIA, KLON , KLEV & |
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| 3 | &, PBINT , PBSUI, PCLDLD, PCLDLU & |
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| 4 | &, PCNTRB, PEMIT, PFLUC & |
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| 5 | &, PFLUX & |
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| 6 | &) |
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| 7 | |
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| 8 | !**** *LWC* - LONGWAVE RADIATION, CLOUD EFFECTS |
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| 9 | |
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| 10 | ! PURPOSE. |
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| 11 | ! -------- |
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| 12 | ! INTRODUCES CLOUD EFFECTS ON LONGWAVE FLUXES OR |
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| 13 | ! RADIANCES |
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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 | ! EXPLICIT ARGUMENTS : |
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| 19 | ! -------------------- |
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| 20 | ! ==== INPUTS === |
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| 21 | ! PBINT : (KLON,KLEV+1) ; HALF LEVEL PLANCK FUNCTION |
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| 22 | ! PBSUI : (KLON) ; SURFACE PLANCK FUNCTION |
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| 23 | ! PCLDLD : (KLON,KLEV) ; DOWNWARD EFFECTIVE CLOUD FRACTION |
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| 24 | ! PCLDLU : (KLON,KLEV) ; UPWARD EFFECTIVE CLOUD FRACTION |
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| 25 | ! PCNTRB : (KLON,KLEV+1,KLEV+1); CLEAR-SKY ENERGY EXCHANGE MATRIX |
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| 26 | ! PEMIT : (KLON) ; SURFACE TOTAL LW EMISSIVITY |
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| 27 | ! PFLUC : (KLON,2,KLEV+1) ; CLEAR-SKY LW RADIATIVE FLUXES |
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| 28 | ! ==== OUTPUTS === |
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| 29 | ! PFLUX : (KLON,2,KLEV+1) ; TOTAL SKY LW RADIATIVE FLUXES : |
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| 30 | ! 1 ==> UPWARD FLUX TOTAL |
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| 31 | ! 2 ==> DOWNWARD FLUX TOTAL |
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| 32 | |
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| 33 | ! IMPLICIT ARGUMENTS : NONE |
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| 34 | ! -------------------- |
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| 35 | |
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| 36 | ! METHOD. |
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| 37 | ! ------- |
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| 38 | |
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| 39 | ! 1. INITIALIZES ALL FLUXES TO CLEAR-SKY VALUES |
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| 40 | ! 2. EFFECT OF ONE OVERCAST UNITY EMISSIVITY CLOUD LAYER |
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| 41 | ! 3. EFFECT OF SEMI-TRANSPARENT, PARTIAL OR MULTI-LAYERED |
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| 42 | ! CLOUDS |
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| 43 | |
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| 44 | ! EXTERNALS. |
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| 45 | ! ---------- |
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| 46 | |
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| 47 | ! NONE |
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| 48 | |
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| 49 | ! REFERENCE. |
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| 50 | ! ---------- |
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| 51 | |
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| 52 | ! SEE RADIATION'S PART OF THE MODEL'S DOCUMENTATION AND |
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| 53 | ! ECMWF RESEARCH DEPARTMENT DOCUMENTATION OF THE IFS |
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| 54 | |
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| 55 | ! AUTHOR. |
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| 56 | ! ------- |
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| 57 | ! JEAN-JACQUES MORCRETTE *ECMWF* |
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| 58 | |
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| 59 | ! MODIFICATIONS. |
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| 60 | ! -------------- |
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| 61 | ! ORIGINAL : 89-07-14 |
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| 62 | ! JJ Morcrette 97-04-18 Cleaning |
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| 63 | |
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| 64 | !----------------------------------------------------------------------- |
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| 65 | |
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| 66 | #include "tsmbkind.h" |
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| 67 | |
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| 68 | USE YOERAD , ONLY : NOVLP |
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| 69 | USE YOERDI , ONLY : REPCLC |
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| 70 | USE YOEOVLP , ONLY : RA1OVLP |
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| 71 | |
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| 72 | |
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| 73 | IMPLICIT NONE |
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| 74 | |
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| 75 | |
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| 76 | ! DUMMY INTEGER SCALARS |
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| 77 | INTEGER_M :: KFDIA |
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| 78 | INTEGER_M :: KIDIA |
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| 79 | INTEGER_M :: KLEV |
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| 80 | INTEGER_M :: KLON |
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| 81 | |
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| 82 | |
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| 83 | |
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| 84 | !----------------------------------------------------------------------- |
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| 85 | |
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| 86 | !* 0.1 ARGUMENTS |
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| 87 | ! --------- |
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| 88 | |
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| 89 | REAL_B ::& |
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| 90 | &PBINT(KLON,KLEV+1), PBSUI(KLON) & |
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| 91 | &, PCLDLD(KLON,KLEV) , PCLDLU(KLON,KLEV)& |
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| 92 | &, PCNTRB(KLON,KLEV+1,KLEV+1)& |
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| 93 | &, PEMIT(KLON)& |
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| 94 | &, PFLUC(KLON,2,KLEV+1) |
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| 95 | |
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| 96 | REAL_B :: PFLUX(KLON,2,KLEV+1) |
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| 97 | |
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| 98 | !----------------------------------------------------------------------- |
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| 99 | |
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| 100 | !* 0.2 LOCAL ARRAYS |
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| 101 | ! ------------ |
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| 102 | |
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| 103 | REAL_B :: ZCLEAR(KLON) , ZCLOUD(KLON)& |
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| 104 | &, ZCLM(KLON,KLEV+1,KLEV+1), ZDNF(KLON,KLEV+1,KLEV+1)& |
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| 105 | &, ZFD(KLON) , ZFU(KLON)& |
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| 106 | &, ZUPF(KLON,KLEV+1,KLEV+1) |
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| 107 | |
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| 108 | ! LOCAL INTEGER SCALARS |
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| 109 | INTEGER_M :: IKCP1, IKM1, IKP1, IMAXC, IMXM1, IMXP1, JCLOUD,& |
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| 110 | &JK, JK1, JK2, JKJ, JL |
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| 111 | |
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| 112 | ! LOCAL REAL SCALARS |
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| 113 | REAL_B :: ZALPHA1, ZCFRAC |
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| 114 | |
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| 115 | |
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| 116 | ! ------------------------------------------------------------------ |
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| 117 | |
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| 118 | !* 1. INITIALIZATION |
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| 119 | ! -------------- |
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| 120 | |
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| 121 | !100 CONTINUE |
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| 122 | |
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| 123 | !print *,' Enter LWC ' |
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| 124 | DO JL = KIDIA,KFDIA |
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| 125 | ZCLOUD(JL) = _ZERO_ |
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| 126 | ENDDO |
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| 127 | |
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| 128 | DO JK = 1 , KLEV+1 |
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| 129 | DO JL = KIDIA,KFDIA |
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| 130 | PFLUX(JL,1,JK) = PFLUC(JL,1,JK) |
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| 131 | PFLUX(JL,2,JK) = PFLUC(JL,2,JK) |
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| 132 | ENDDO |
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| 133 | ENDDO |
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| 134 | |
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| 135 | !GM******* |
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| 136 | IMAXC=KLEV |
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| 137 | !GM******* |
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| 138 | |
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| 139 | |
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| 140 | ! ------------------------------------------------------------------ |
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| 141 | |
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| 142 | !* 2. EFFECT OF CLOUDINESS ON LONGWAVE FLUXES |
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| 143 | ! --------------------------------------- |
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| 144 | |
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| 145 | |
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| 146 | IMXP1 = IMAXC + 1 |
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| 147 | IMXM1 = IMAXC - 1 |
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| 148 | |
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| 149 | !* 2.0 INITIALIZE TO CLEAR-SKY FLUXES |
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| 150 | ! ------------------------------ |
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| 151 | |
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| 152 | !200 CONTINUE |
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| 153 | |
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| 154 | DO JK1=1,KLEV+1 |
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| 155 | DO JK2=1,KLEV+1 |
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| 156 | DO JL = KIDIA,KFDIA |
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| 157 | ZUPF(JL,JK2,JK1)=PFLUC(JL,1,JK1) |
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| 158 | ZDNF(JL,JK2,JK1)=PFLUC(JL,2,JK1) |
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| 159 | ENDDO |
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| 160 | ENDDO |
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| 161 | ENDDO |
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| 162 | !print *,' LWC after Initialisation to clear-sky fluxes' |
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| 163 | |
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| 164 | !* 2.1 FLUXES FOR ONE OVERCAST UNITY EMISSIVITY CLOUD |
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| 165 | ! ---------------------------------------------- |
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| 166 | |
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| 167 | !210 CONTINUE |
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| 168 | |
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| 169 | DO JCLOUD = 1 , IMAXC |
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| 170 | IKCP1=JCLOUD+1 |
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| 171 | |
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| 172 | !* 2.1.1 ABOVE THE CLOUD |
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| 173 | ! --------------- |
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| 174 | |
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| 175 | !2110 CONTINUE |
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| 176 | |
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| 177 | DO JK=IKCP1,KLEV+1 |
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| 178 | IKM1=JK-1 |
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| 179 | DO JL = KIDIA,KFDIA |
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| 180 | ZFU(JL)=_ZERO_ |
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| 181 | ENDDO |
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| 182 | |
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| 183 | IF (JK > IKCP1) THEN |
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| 184 | DO JKJ=IKCP1,IKM1 |
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| 185 | DO JL = KIDIA,KFDIA |
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| 186 | ZFU(JL) = ZFU(JL) + PCNTRB(JL,JK,JKJ) |
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| 187 | ENDDO |
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| 188 | ENDDO |
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| 189 | ENDIF |
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| 190 | |
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| 191 | DO JL = KIDIA,KFDIA |
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| 192 | ZUPF(JL,IKCP1,JK)=PBINT(JL,JK)-ZFU(JL) |
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| 193 | ENDDO |
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| 194 | ENDDO |
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| 195 | |
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| 196 | !* 2.1.2 BELOW THE CLOUD |
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| 197 | ! --------------- |
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| 198 | |
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| 199 | !2120 CONTINUE |
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| 200 | |
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| 201 | DO JK=1,JCLOUD |
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| 202 | IKP1=JK+1 |
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| 203 | DO JL = KIDIA,KFDIA |
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| 204 | ZFD(JL)=_ZERO_ |
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| 205 | ENDDO |
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| 206 | |
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| 207 | IF (JK < JCLOUD) THEN |
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| 208 | DO JKJ=IKP1,JCLOUD |
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| 209 | DO JL = KIDIA,KFDIA |
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| 210 | ZFD(JL) = ZFD(JL) + PCNTRB(JL,JK,JKJ) |
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| 211 | ENDDO |
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| 212 | ENDDO |
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| 213 | ENDIF |
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| 214 | |
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| 215 | DO JL = KIDIA,KFDIA |
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| 216 | ZDNF(JL,IKCP1,JK)=-PBINT(JL,JK)-ZFD(JL) |
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| 217 | ENDDO |
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| 218 | ENDDO |
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| 219 | |
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| 220 | ENDDO |
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| 221 | !print *,' LWC after 213: Fluxes for unity emissivity' |
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| 222 | |
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| 223 | |
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| 224 | !* 2.2 CLOUD COVER MATRIX |
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| 225 | ! ------------------ |
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| 226 | |
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| 227 | !* ZCLM(JK1,JK2) IS THE OBSCURATION FACTOR BY CLOUD LAYERS BETWEEN |
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| 228 | ! HALF-LEVELS JK1 AND JK2 AS SEEN FROM JK1 |
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| 229 | |
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| 230 | !220 CONTINUE |
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| 231 | |
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| 232 | DO JK1 = 1 , KLEV+1 |
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| 233 | DO JK2 = 1 , KLEV+1 |
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| 234 | DO JL = KIDIA,KFDIA |
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| 235 | ZCLM(JL,JK1,JK2) = _ZERO_ |
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| 236 | ENDDO |
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| 237 | ENDDO |
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| 238 | ENDDO |
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| 239 | !print *,' LWC after Initialisation CC matrix' |
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| 240 | |
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| 241 | |
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| 242 | |
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| 243 | !* 2.4 CLOUD COVER BELOW THE LEVEL OF CALCULATION |
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| 244 | ! ------------------------------------------ |
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| 245 | |
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| 246 | !240 CONTINUE |
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| 247 | |
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| 248 | DO JK1 = 2 , KLEV+1 |
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| 249 | DO JL = KIDIA,KFDIA |
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| 250 | ZCLEAR(JL)=_ONE_ |
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| 251 | ZCLOUD(JL)=_ZERO_ |
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| 252 | ENDDO |
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| 253 | |
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| 254 | DO JK = JK1 - 1 , 1 , -1 |
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| 255 | DO JL = KIDIA,KFDIA |
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| 256 | IF (NOVLP == 1) THEN |
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| 257 | !* maximum-random |
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| 258 | ZCLEAR(JL)=ZCLEAR(JL)*(_ONE_-MAX(PCLDLU(JL,JK),ZCLOUD(JL)))& |
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| 259 | &/(_ONE_-MIN(ZCLOUD(JL),_ONE_-REPCLC)) |
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| 260 | ZCLM(JL,JK1,JK) = _ONE_ - ZCLEAR(JL) |
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| 261 | ZCLOUD(JL) = PCLDLU(JL,JK) |
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| 262 | ELSEIF (NOVLP == 2) THEN |
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| 263 | !* maximum |
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| 264 | ZCLOUD(JL) = MAX(ZCLOUD(JL) , PCLDLU(JL,JK)) |
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| 265 | ZCLM(JL,JK1,JK) = ZCLOUD(JL) |
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| 266 | ELSEIF (NOVLP == 3) THEN |
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| 267 | !* random |
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| 268 | ZCLEAR(JL) = ZCLEAR(JL)*(_ONE_ - PCLDLU(JL,JK)) |
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| 269 | ZCLOUD(JL) = _ONE_ - ZCLEAR(JL) |
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| 270 | ZCLM(JL,JK1,JK) = ZCLOUD(JL) |
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| 271 | ELSEIF (NOVLP == 4) THEN |
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| 272 | !** Hogan & Illingworth (2001) |
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| 273 | ZALPHA1=RA1OVLP(KLEV+1-JK) |
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| 274 | ZCLEAR(JL)=ZCLEAR(JL)*( & |
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| 275 | & ZALPHA1*(_ONE_-MAX(PCLDLU(JL,JK),ZCLOUD(JL))) & |
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| 276 | & /(_ONE_-MIN(ZCLOUD(JL),_ONE_-REPCLC)) & |
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| 277 | & +(_ONE_-ZALPHA1)*(_ONE_-PCLDLU(JL,JK)) ) |
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| 278 | ZCLM(JL,JK1,JK) = _ONE_ - ZCLEAR(JL) |
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| 279 | ZCLOUD(JL) = PCLDLU(JL,JK) |
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| 280 | ENDIF |
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| 281 | ENDDO |
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| 282 | ENDDO |
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| 283 | |
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| 284 | ENDDO |
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| 285 | !print *,' LWC after 244: CC below level of calculation' |
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| 286 | |
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| 287 | |
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| 288 | !* 2.5 CLOUD COVER ABOVE THE LEVEL OF CALCULATION |
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| 289 | ! ------------------------------------------ |
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| 290 | |
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| 291 | !250 CONTINUE |
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| 292 | |
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| 293 | DO JK1 = 1 , KLEV |
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| 294 | DO JL = KIDIA,KFDIA |
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| 295 | ZCLEAR(JL)=_ONE_ |
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| 296 | ZCLOUD(JL)=_ZERO_ |
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| 297 | ENDDO |
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| 298 | |
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| 299 | DO JK = JK1 , KLEV |
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| 300 | DO JL = KIDIA,KFDIA |
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| 301 | IF (NOVLP == 1) THEN |
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| 302 | !* maximum-random |
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| 303 | ZCLEAR(JL)=ZCLEAR(JL)*(_ONE_-MAX(PCLDLD(JL,JK),ZCLOUD(JL)))& |
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| 304 | &/(_ONE_-MIN(ZCLOUD(JL),_ONE_-REPCLC)) |
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| 305 | ZCLM(JL,JK1,JK) = _ONE_ - ZCLEAR(JL) |
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| 306 | ZCLOUD(JL) = PCLDLD(JL,JK) |
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| 307 | ELSEIF (NOVLP == 2) THEN |
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| 308 | !* maximum |
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| 309 | ZCLOUD(JL) = MAX(ZCLOUD(JL) , PCLDLD(JL,JK)) |
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| 310 | ZCLM(JL,JK1,JK) = ZCLOUD(JL) |
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| 311 | ELSEIF (NOVLP == 3) THEN |
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| 312 | !* random |
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| 313 | ZCLEAR(JL) = ZCLEAR(JL)*(_ONE_ - PCLDLD(JL,JK)) |
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| 314 | ZCLOUD(JL) = _ONE_ - ZCLEAR(JL) |
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| 315 | ZCLM(JL,JK1,JK) = ZCLOUD(JL) |
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| 316 | ELSEIF (NOVLP == 4) THEN |
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| 317 | !** Hogan & Illingworth (2001) |
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| 318 | ZALPHA1=RA1OVLP(KLEV+1-JK) |
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| 319 | ZCLEAR(JL)=ZCLEAR(JL)*( & |
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| 320 | & ZALPHA1*(_ONE_-MAX(PCLDLD(JL,JK),ZCLOUD(JL))) & |
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| 321 | & /(_ONE_-MIN(ZCLOUD(JL),_ONE_-REPCLC)) & |
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| 322 | & +(_ONE_-ZALPHA1)*(_ONE_ - PCLDLD(JL,JK)) ) |
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| 323 | ZCLM(JL,JK1,JK) = _ONE_ - ZCLEAR(JL) |
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| 324 | ZCLOUD(JL) = PCLDLD(JL,JK) |
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| 325 | ENDIF |
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| 326 | ENDDO |
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| 327 | ENDDO |
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| 328 | ENDDO |
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| 329 | !print *,' LWC after 254: CC above level of calculation' |
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| 330 | |
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| 331 | |
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| 332 | |
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| 333 | !* 3. FLUXES FOR PARTIAL/MULTIPLE LAYERED CLOUDINESS |
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| 334 | ! ---------------------------------------------- |
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| 335 | |
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| 336 | !300 CONTINUE |
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| 337 | |
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| 338 | !* 3.1 DOWNWARD FLUXES |
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| 339 | ! --------------- |
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| 340 | |
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| 341 | !310 CONTINUE |
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| 342 | |
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| 343 | DO JL = KIDIA,KFDIA |
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| 344 | PFLUX(JL,2,KLEV+1) = _ZERO_ |
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| 345 | ENDDO |
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| 346 | |
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| 347 | DO JK1 = KLEV , 1 , -1 |
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| 348 | |
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| 349 | !* CONTRIBUTION FROM CLEAR-SKY FRACTION |
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| 350 | |
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| 351 | DO JL = KIDIA,KFDIA |
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| 352 | ZFD (JL) = (_ONE_ - ZCLM(JL,JK1,KLEV)) * ZDNF(JL,1,JK1) |
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| 353 | |
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| 354 | !* CONTRIBUTION FROM ADJACENT CLOUD |
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| 355 | |
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| 356 | ZFD(JL) = ZFD(JL) + ZCLM(JL,JK1,JK1) * ZDNF(JL,JK1+1,JK1) |
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| 357 | ENDDO |
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| 358 | |
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| 359 | !* CONTRIBUTION FROM OTHER CLOUDY FRACTIONS |
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| 360 | |
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| 361 | DO JK = KLEV-1 , JK1 , -1 |
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| 362 | DO JL = KIDIA,KFDIA |
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| 363 | ZCFRAC = ZCLM(JL,JK1,JK+1) - ZCLM(JL,JK1,JK) |
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| 364 | ZFD(JL) = ZFD(JL) + ZCFRAC * ZDNF(JL,JK+2,JK1) |
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| 365 | ENDDO |
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| 366 | ENDDO |
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| 367 | |
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| 368 | DO JL = KIDIA,KFDIA |
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| 369 | PFLUX(JL,2,JK1) = ZFD (JL) |
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| 370 | ENDDO |
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| 371 | |
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| 372 | ENDDO |
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| 373 | ! print *,' LWC after 317: Downward fluxes' |
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| 374 | |
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| 375 | |
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| 376 | |
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| 377 | |
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| 378 | !* 3.2 UPWARD FLUX AT THE SURFACE |
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| 379 | ! -------------------------- |
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| 380 | |
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| 381 | !320 CONTINUE |
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| 382 | |
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| 383 | DO JL = KIDIA,KFDIA |
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| 384 | PFLUX(JL,1,1) = PEMIT(JL)*PBSUI(JL)-(_ONE_-PEMIT(JL))*PFLUX(JL,2,1) |
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| 385 | ENDDO |
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| 386 | |
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| 387 | |
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| 388 | |
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| 389 | !* 3.3 UPWARD FLUXES |
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| 390 | ! ------------- |
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| 391 | |
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| 392 | !330 CONTINUE |
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| 393 | |
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| 394 | DO JK1 = 2 , KLEV+1 |
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| 395 | |
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| 396 | !* CONTRIBUTION FROM CLEAR-SKY FRACTION |
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| 397 | |
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| 398 | DO JL = KIDIA,KFDIA |
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| 399 | ZFU (JL) = (_ONE_ - ZCLM(JL,JK1,1)) * ZUPF(JL,1,JK1) |
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| 400 | |
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| 401 | !* CONTRIBUTION FROM ADJACENT CLOUD |
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| 402 | |
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| 403 | ZFU(JL) = ZFU(JL) + ZCLM(JL,JK1,JK1-1) * ZUPF(JL,JK1,JK1) |
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| 404 | ENDDO |
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| 405 | |
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| 406 | !* CONTRIBUTION FROM OTHER CLOUDY FRACTIONS |
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| 407 | |
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| 408 | DO JK = 2 , JK1-1 |
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| 409 | DO JL = KIDIA,KFDIA |
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| 410 | ZCFRAC = ZCLM(JL,JK1,JK-1) - ZCLM(JL,JK1,JK) |
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| 411 | ZFU(JL) = ZFU(JL) + ZCFRAC * ZUPF(JL,JK ,JK1) |
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| 412 | ENDDO |
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| 413 | ENDDO |
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| 414 | |
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| 415 | DO JL = KIDIA,KFDIA |
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| 416 | PFLUX(JL,1,JK1) = ZFU (JL) |
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| 417 | ENDDO |
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| 418 | |
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| 419 | ENDDO |
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| 420 | ! print *,' LWC after 337: Upward fluxes' |
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| 421 | |
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| 422 | !----------------------------------------------------------------------- |
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| 423 | |
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| 424 | RETURN |
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| 425 | END SUBROUTINE LWC |
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