[2089] | 1 | SUBROUTINE LWB & |
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| 2 | &( KIDIA, KFDIA, KLON , KLEV , KMODE & |
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| 3 | &, PDT0 , PTAVE, PTL & |
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| 4 | &, PB , PBINT, PBSUR , PBTOP , PDBSL & |
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| 5 | &, PGA , PGB , PGASUR, PGBSUR, PGATOP, PGBTOP & |
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| 6 | &) |
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| 7 | |
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| 8 | !**** *LWB* - COMPUTES BLACK-BODY FUNCTIONS FOR LONGWAVE CALCULATIONS |
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| 9 | |
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| 10 | ! PURPOSE. |
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| 11 | ! -------- |
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| 12 | ! COMPUTES PLANCK FUNCTIONS |
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| 13 | |
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| 14 | !** INTERFACE. |
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| 15 | ! ---------- |
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| 16 | |
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| 17 | ! EXPLICIT ARGUMENTS : |
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| 18 | ! -------------------- |
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| 19 | ! ==== INPUTS === |
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| 20 | ! PDT0 : (KLON) ; SURFACE TEMPERATURE DISCONTINUITY |
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| 21 | ! PTAVE : (KLON,KLEV) ; TEMPERATURE |
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| 22 | ! PTL : (KLON,KLEV+1) ; HALF LEVEL TEMPERATURE |
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| 23 | ! ==== OUTPUTS === |
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| 24 | ! PB : (KLON,NSIL,KLEV+1); SPECTRAL HALF LEVEL PLANCK FUNCTION |
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| 25 | ! PBINT : (KLON,KLEV+1) ; HALF LEVEL PLANCK FUNCTION |
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| 26 | ! PBSUR : (KLON,NSIL) ; SURFACE SPECTRAL PLANCK FUNCTION |
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| 27 | ! PBTOP : (KLON,NSIL) ; TOP SPECTRAL PLANCK FUNCTION |
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| 28 | ! PDBSL : (KLON,NSIL,KLEV*2); SUB-LAYER PLANCK FUNCTION GRADIENT |
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| 29 | ! PGA : (KLON,8,2,KLEV) ; dB/dT-weighted LAYER PADE APPROXIMANTS |
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| 30 | ! PGB : (KLON,8,2,KLEV) ; dB/dT-weighted LAYER PADE APPROXIMANTS |
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| 31 | ! PGASUR, PGBSUR (KLON,8,2) ; SURFACE PADE APPROXIMANTS |
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| 32 | ! PGATOP, PGBTOP (KLON,8,2) ; T.O.A. PADE APPROXIMANTS |
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| 33 | |
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| 34 | ! IMPLICIT ARGUMENTS : NONE |
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| 35 | ! -------------------- |
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| 36 | |
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| 37 | ! METHOD. |
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| 38 | ! ------- |
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| 39 | |
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| 40 | ! 1. COMPUTES THE PLANCK FUNCTION ON ALL LEVELS AND HALF LEVELS |
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| 41 | ! FROM A POLYNOMIAL DEVELOPMENT OF PLANCK FUNCTION |
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| 42 | |
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| 43 | ! EXTERNALS. |
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| 44 | ! ---------- |
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| 45 | |
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| 46 | ! NONE |
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| 47 | |
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| 48 | ! REFERENCE. |
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| 49 | ! ---------- |
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| 50 | |
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| 51 | ! SEE RADIATION'S PART OF THE MODEL'S DOCUMENTATION AND |
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| 52 | ! ECMWF RESEARCH DEPARTMENT DOCUMENTATION OF THE IFS " |
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| 53 | |
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| 54 | ! AUTHOR. |
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| 55 | ! ------- |
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| 56 | ! JEAN-JACQUES MORCRETTE *ECMWF* |
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| 57 | |
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| 58 | ! MODIFICATIONS. |
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| 59 | ! -------------- |
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| 60 | ! ORIGINAL : 89-07-14 |
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| 61 | ! MODIFIED : 99-06-14 D.SALMOND Optimisation |
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| 62 | |
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| 63 | !----------------------------------------------------------------------- |
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| 64 | |
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| 65 | #include "tsmbkind.h" |
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| 66 | |
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| 67 | USE YOELW , ONLY : MXIXT ,NSIL ,NIPD ,PDGA ,& |
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| 68 | &PDGB ,TINTP ,TSTAND ,TSTP ,XP |
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| 69 | |
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| 70 | |
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| 71 | IMPLICIT NONE |
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| 72 | |
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| 73 | |
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| 74 | ! DUMMY INTEGER SCALARS |
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| 75 | INTEGER_M :: KFDIA |
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| 76 | INTEGER_M :: KIDIA |
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| 77 | INTEGER_M :: KLEV |
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| 78 | INTEGER_M :: KLON |
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| 79 | INTEGER_M :: KMODE |
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| 80 | |
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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 | !* 0.1 ARGUMENTS |
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| 86 | ! --------- |
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| 87 | |
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| 88 | REAL_B :: PDT0(KLON),PTAVE(KLON,KLEV),PTL(KLON,KLEV+1) |
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| 89 | |
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| 90 | REAL_B :: PB(KLON,NSIL,KLEV+1) , PBINT(KLON,KLEV+1)& |
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| 91 | &, PBSUR(KLON,NSIL) , PBTOP(KLON,NSIL) & |
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| 92 | &, PDBSL(KLON,NSIL,KLEV*2)& |
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| 93 | &, PGA(KLON,NIPD,2,KLEV) , PGB(KLON,NIPD,2,KLEV)& |
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| 94 | &, PGASUR(KLON,NIPD,2) , PGBSUR(KLON,NIPD,2)& |
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| 95 | &, PGATOP(KLON,NIPD,2) , PGBTOP(KLON,NIPD,2) |
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| 96 | |
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| 97 | !------------------------------------------------------------------------- |
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| 98 | |
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| 99 | !* 0.2 LOCAL ARRAYS |
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| 100 | ! ------------ |
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| 101 | INTEGER_M :: INDB(KLON) , INDS(KLON) |
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| 102 | REAL_B :: ZBLAY(KLON,KLEV), ZBLEV(KLON,KLEV+1)& |
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| 103 | &, ZRES(KLON) , ZRES2(KLON)& |
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| 104 | &, ZTI(KLON) , ZTI2(KLON) |
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| 105 | |
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| 106 | ! LOCAL INTEGER SCALARS |
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| 107 | INTEGER_M :: ILEV2, INDSU, INDT, INDTO, INDTP, INUE, INUS,& |
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| 108 | &IXTOX, IXTX, JF, JG, JK, JK1, JK2, JL, JNU |
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| 109 | |
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| 110 | ! LOCAL REAL SCALARS |
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| 111 | REAL_B :: ZDST1, ZDSTO1, ZDSTOX, ZDSTX |
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| 112 | |
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| 113 | |
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| 114 | ! ------------------------------------------------------------------ |
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| 115 | |
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| 116 | |
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| 117 | !* 1.0 PLANCK FUNCTIONS AND GRADIENTS |
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| 118 | ! ------------------------------ |
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| 119 | |
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| 120 | ILEV2=2*KLEV |
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| 121 | INUS=1 |
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| 122 | INUE=NSIL |
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| 123 | IF (KMODE == 2) THEN |
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| 124 | INUS=3 |
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| 125 | INUE=4 |
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| 126 | ENDIF |
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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 | PBINT(JL,JK) = _ZERO_ |
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| 131 | ENDDO |
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| 132 | ENDDO |
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| 133 | |
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| 134 | DO JNU=1,NSIL |
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| 135 | DO JL=KIDIA,KFDIA |
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| 136 | PBSUR(JL,JNU)=_ZERO_ |
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| 137 | PBTOP(JL,JNU)=_ZERO_ |
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| 138 | ENDDO |
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| 139 | DO JK=1,KLEV |
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| 140 | DO JL=KIDIA,KFDIA |
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| 141 | PB(JL,JNU,JK)=_ZERO_ |
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| 142 | ENDDO |
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| 143 | ENDDO |
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| 144 | DO JK=1,ILEV2 |
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| 145 | DO JL=KIDIA,KFDIA |
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| 146 | PDBSL(JL,JNU,JK)=_ZERO_ |
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| 147 | ENDDO |
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| 148 | ENDDO |
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| 149 | ENDDO |
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| 150 | |
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| 151 | DO JNU=INUS,INUE |
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| 152 | |
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| 153 | |
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| 154 | !* 1.1 LEVELS FROM SURFACE TO KLEV |
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| 155 | ! ---------------------------- |
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| 156 | |
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| 157 | DO JK = 1 , KLEV |
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| 158 | DO JL = KIDIA,KFDIA |
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| 159 | ZTI(JL)=(PTL(JL,JK)-TSTAND)/TSTAND |
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| 160 | ZRES(JL) = XP(1,JNU)+ZTI(JL)*(XP(2,JNU)+ZTI(JL)*(XP(3,JNU)& |
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| 161 | &+ZTI(JL)*(XP(4,JNU)+ZTI(JL)*(XP(5,JNU)+ZTI(JL)*(XP(6,JNU)& |
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| 162 | &))))) |
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| 163 | PBINT(JL,JK)=PBINT(JL,JK)+ZRES(JL) |
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| 164 | PB(JL,JNU,JK)= ZRES(JL) |
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| 165 | ZBLEV(JL,JK) = ZRES(JL) |
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| 166 | |
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| 167 | ZTI2(JL)=(PTAVE(JL,JK)-TSTAND)/TSTAND |
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| 168 | ZRES2(JL)=XP(1,JNU)+ZTI2(JL)*(XP(2,JNU)+ZTI2(JL)*(XP(3,JNU)& |
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| 169 | &+ZTI2(JL)*(XP(4,JNU)+ZTI2(JL)*(XP(5,JNU)+ZTI2(JL)*(XP(6,& |
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| 170 | &JNU)& |
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| 171 | &))))) |
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| 172 | ZBLAY(JL,JK) = ZRES2(JL) |
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| 173 | ENDDO |
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| 174 | ENDDO |
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| 175 | |
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| 176 | |
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| 177 | !* 1.2 TOP OF THE ATMOSPHERE AND SURFACE |
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| 178 | ! --------------------------------- |
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| 179 | |
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| 180 | DO JL = KIDIA,KFDIA |
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| 181 | ZTI(JL)=(PTL(JL,KLEV+1)-TSTAND)/TSTAND |
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| 182 | ZTI2(JL) = (PTL(JL,1) + PDT0(JL) - TSTAND) / TSTAND |
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| 183 | ZRES(JL) = XP(1,JNU)+ZTI(JL)*(XP(2,JNU)+ZTI(JL)*(XP(3,JNU)& |
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| 184 | &+ZTI(JL)*(XP(4,JNU)+ZTI(JL)*(XP(5,JNU)+ZTI(JL)*(XP(6,JNU)& |
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| 185 | &))))) |
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| 186 | ZRES2(JL) = XP(1,JNU)+ZTI2(JL)*(XP(2,JNU)+ZTI2(JL)*(XP(3,JNU)& |
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| 187 | &+ZTI2(JL)*(XP(4,JNU)+ZTI2(JL)*(XP(5,JNU)+ZTI2(JL)*(XP(6,JNU)& |
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| 188 | &))))) |
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| 189 | PBINT(JL,KLEV+1) = PBINT(JL,KLEV+1)+ZRES(JL) |
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| 190 | PB(JL,JNU,KLEV+1)= ZRES(JL) |
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| 191 | ZBLEV(JL,KLEV+1) = ZRES(JL) |
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| 192 | PBTOP(JL,JNU) = ZRES(JL) |
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| 193 | PBSUR(JL,JNU) = ZRES2(JL) |
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| 194 | ENDDO |
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| 195 | |
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| 196 | |
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| 197 | !* 1.3 GRADIENTS IN SUB-LAYERS |
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| 198 | ! ----------------------- |
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| 199 | |
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| 200 | DO JK = 1 , KLEV |
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| 201 | JK2 = 2 * JK |
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| 202 | JK1 = JK2 - 1 |
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| 203 | DO JL = KIDIA,KFDIA |
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| 204 | PDBSL(JL,JNU,JK1) = ZBLAY(JL,JK ) - ZBLEV(JL,JK) |
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| 205 | PDBSL(JL,JNU,JK2) = ZBLEV(JL,JK+1) - ZBLAY(JL,JK) |
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| 206 | ENDDO |
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| 207 | ENDDO |
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| 208 | |
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| 209 | ENDDO |
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| 210 | |
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| 211 | !* 2.0 CHOOSE THE RELEVANT SETS OF PADE APPROXIMANTS |
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| 212 | ! --------------------------------------------- |
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| 213 | |
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| 214 | DO JL=KIDIA,KFDIA |
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| 215 | ZDSTO1 = (PTL(JL,KLEV+1)-TINTP(1)) / TSTP |
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| 216 | IXTOX = MAX( 1, MIN( INT(MXIXT), INT( ZDSTO1 + _ONE_ ) ) ) |
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| 217 | ZDSTOX = (PTL(JL,KLEV+1)-TINTP(IXTOX))/TSTP |
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| 218 | IF (ZDSTOX < _HALF_) THEN |
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| 219 | INDTO=IXTOX |
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| 220 | ELSE |
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| 221 | INDTO=IXTOX+1 |
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| 222 | ENDIF |
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| 223 | INDB(JL)=INDTO |
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| 224 | ZDST1 = (PTL(JL,1)-TINTP(1)) / TSTP |
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| 225 | IXTX = MAX( 1, MIN( INT(MXIXT), INT( ZDST1 + _ONE_ ) ) ) |
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| 226 | ZDSTX = (PTL(JL,1)-TINTP(IXTX))/TSTP |
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| 227 | IF (ZDSTX < _HALF_) THEN |
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| 228 | INDT=IXTX |
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| 229 | ELSE |
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| 230 | INDT=IXTX+1 |
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| 231 | ENDIF |
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| 232 | INDS(JL)=INDT |
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| 233 | ENDDO |
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| 234 | |
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| 235 | DO JF=1,2 |
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| 236 | DO JG=1,NIPD |
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| 237 | DO JL=KIDIA,KFDIA |
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| 238 | INDSU=INDS(JL) |
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| 239 | PGASUR(JL,JG,JF)=PDGA(INDSU,2*JG-1,JF) |
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| 240 | PGBSUR(JL,JG,JF)=PDGB(INDSU,2*JG-1,JF) |
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| 241 | INDTP=INDB(JL) |
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| 242 | PGATOP(JL,JG,JF)=PDGA(INDTP,2*JG-1,JF) |
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| 243 | PGBTOP(JL,JG,JF)=PDGB(INDTP,2*JG-1,JF) |
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| 244 | ENDDO |
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| 245 | ENDDO |
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| 246 | ENDDO |
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| 247 | |
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| 248 | |
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| 249 | DO JK=1,KLEV |
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| 250 | DO JL=KIDIA,KFDIA |
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| 251 | ZDST1 = (PTAVE(JL,JK)-TINTP(1)) / TSTP |
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| 252 | IXTX = MAX( 1, MIN( INT(MXIXT), INT( ZDST1 + _ONE_ ) ) ) |
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| 253 | ZDSTX = (PTAVE(JL,JK)-TINTP(IXTX))/TSTP |
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| 254 | IF (ZDSTX < _HALF_) THEN |
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| 255 | INDT=IXTX |
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| 256 | ELSE |
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| 257 | INDT=IXTX+1 |
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| 258 | ENDIF |
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| 259 | INDB(JL)=INDT |
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| 260 | ENDDO |
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| 261 | |
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| 262 | DO JF=1,2 |
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| 263 | DO JL=KIDIA,KFDIA |
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| 264 | INDT=INDB(JL) |
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| 265 | DO JG=1,NIPD |
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| 266 | PGA(JL,JG,JF,JK)=PDGA(INDT,2*JG,JF) |
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| 267 | PGB(JL,JG,JF,JK)=PDGB(INDT,2*JG,JF) |
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| 268 | ENDDO |
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| 269 | ENDDO |
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| 270 | ENDDO |
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| 271 | |
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| 272 | |
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| 273 | ENDDO |
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| 274 | |
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| 275 | ! ------------------------------------------------------------------ |
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| 276 | |
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| 277 | RETURN |
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| 278 | END SUBROUTINE LWB |
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