| [2089] | 1 | SUBROUTINE SWTT ( KIDIA, KFDIA, KLON, KNU, KA , PU, PTR) |
|---|
| 2 | |
|---|
| 3 | !**** *SWTT* - COMPUTES THE SHORTWAVE TRANSMISSION FUNCTIONS |
|---|
| 4 | |
|---|
| 5 | ! PURPOSE. |
|---|
| 6 | ! -------- |
|---|
| 7 | ! THIS ROUTINE COMPUTES THE TRANSMISSION FUNCTIONS FOR ALL THE |
|---|
| 8 | ! ABSORBERS (H2O, UNIFORMLY MIXED GASES, AND O3) IN THE TWO SPECTRAL |
|---|
| 9 | ! INTERVALS. |
|---|
| 10 | |
|---|
| 11 | !** INTERFACE. |
|---|
| 12 | ! ---------- |
|---|
| 13 | ! *SWTT* IS CALLED FROM *SW1S*, *SWNI*. |
|---|
| 14 | |
|---|
| 15 | |
|---|
| 16 | ! EXPLICIT ARGUMENTS : |
|---|
| 17 | ! -------------------- |
|---|
| 18 | ! KNU : ; INDEX OF THE SPECTRAL INTERVAL |
|---|
| 19 | ! KA : ; INDEX OF THE ABSORBER |
|---|
| 20 | ! PU : (KLON) ; ABSORBER AMOUNT |
|---|
| 21 | ! ==== OUTPUTS === |
|---|
| 22 | ! PTR : (KLON) ; TRANSMISSION FUNCTION |
|---|
| 23 | |
|---|
| 24 | ! IMPLICIT ARGUMENTS : NONE |
|---|
| 25 | ! -------------------- |
|---|
| 26 | |
|---|
| 27 | ! METHOD. |
|---|
| 28 | ! ------- |
|---|
| 29 | |
|---|
| 30 | ! TRANSMISSION FUNCTION ARE COMPUTED USING PADE APPROXIMANTS |
|---|
| 31 | ! AND HORNER'S ALGORITHM. |
|---|
| 32 | |
|---|
| 33 | ! EXTERNALS. |
|---|
| 34 | ! ---------- |
|---|
| 35 | |
|---|
| 36 | ! NONE |
|---|
| 37 | |
|---|
| 38 | ! REFERENCE. |
|---|
| 39 | ! ---------- |
|---|
| 40 | |
|---|
| 41 | ! SEE RADIATION'S PART OF THE MODEL'S DOCUMENTATION AND |
|---|
| 42 | ! ECMWF RESEARCH DEPARTMENT DOCUMENTATION OF THE IFS |
|---|
| 43 | |
|---|
| 44 | ! AUTHOR. |
|---|
| 45 | ! ------- |
|---|
| 46 | ! JEAN-JACQUES MORCRETTE *ECMWF* |
|---|
| 47 | |
|---|
| 48 | ! MODIFICATIONS. |
|---|
| 49 | ! -------------- |
|---|
| 50 | ! ORIGINAL : 88-12-15 |
|---|
| 51 | |
|---|
| 52 | !----------------------------------------------------------------------- |
|---|
| 53 | |
|---|
| 54 | #include "tsmbkind.h" |
|---|
| 55 | |
|---|
| 56 | USE YOESW , ONLY : APAD ,BPAD ,D |
|---|
| 57 | |
|---|
| 58 | |
|---|
| 59 | IMPLICIT NONE |
|---|
| 60 | |
|---|
| 61 | |
|---|
| 62 | ! DUMMY INTEGER SCALARS |
|---|
| 63 | INTEGER_M :: KA |
|---|
| 64 | INTEGER_M :: KFDIA |
|---|
| 65 | INTEGER_M :: KIDIA |
|---|
| 66 | INTEGER_M :: KLON |
|---|
| 67 | INTEGER_M :: KNU |
|---|
| 68 | |
|---|
| 69 | |
|---|
| 70 | |
|---|
| 71 | !----------------------------------------------------------------------- |
|---|
| 72 | |
|---|
| 73 | !* 0.1 ARGUMENTS |
|---|
| 74 | ! --------- |
|---|
| 75 | |
|---|
| 76 | REAL_B :: PU(KLON), PTR(KLON) |
|---|
| 77 | |
|---|
| 78 | !----------------------------------------------------------------------- |
|---|
| 79 | |
|---|
| 80 | !* 0.2 LOCAL ARRAYS |
|---|
| 81 | ! ------------ |
|---|
| 82 | |
|---|
| 83 | REAL_B :: ZR1(KLON), ZR2(KLON) |
|---|
| 84 | |
|---|
| 85 | ! LOCAL INTEGER SCALARS |
|---|
| 86 | INTEGER_M :: JL |
|---|
| 87 | |
|---|
| 88 | |
|---|
| 89 | !----------------------------------------------------------------------- |
|---|
| 90 | |
|---|
| 91 | !* 1. HORNER'S ALGORITHM TO COMPUTE TRANSMISSION FUNCTION |
|---|
| 92 | |
|---|
| 93 | |
|---|
| 94 | DO JL = KIDIA,KFDIA |
|---|
| 95 | ZR1(JL) = APAD(KNU,KA,1) + PU(JL) * (APAD(KNU,KA,2) + PU(JL)& |
|---|
| 96 | &* ( APAD(KNU,KA,3) + PU(JL) * (APAD(KNU,KA,4) + PU(JL)& |
|---|
| 97 | &* ( APAD(KNU,KA,5) + PU(JL) * (APAD(KNU,KA,6) + PU(JL)& |
|---|
| 98 | &* ( APAD(KNU,KA,7) )))))) |
|---|
| 99 | |
|---|
| 100 | ZR2(JL) = BPAD(KNU,KA,1) + PU(JL) * (BPAD(KNU,KA,2) + PU(JL)& |
|---|
| 101 | &* ( BPAD(KNU,KA,3) + PU(JL) * (BPAD(KNU,KA,4) + PU(JL)& |
|---|
| 102 | &* ( BPAD(KNU,KA,5) + PU(JL) * (BPAD(KNU,KA,6) + PU(JL)& |
|---|
| 103 | &* ( BPAD(KNU,KA,7) )))))) |
|---|
| 104 | |
|---|
| 105 | |
|---|
| 106 | !* 2. ADD THE BACKGROUND TRANSMISSION |
|---|
| 107 | |
|---|
| 108 | |
|---|
| 109 | |
|---|
| 110 | PTR(JL) = (ZR1(JL) / ZR2(JL)) * (_ONE_ - D(KNU,KA)) + D(KNU,KA) |
|---|
| 111 | ENDDO |
|---|
| 112 | |
|---|
| 113 | RETURN |
|---|
| 114 | END SUBROUTINE SWTT |
|---|
