| 1 | subroutine lwtt (kdlon,u,up,nu,tr) |
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| 2 | |
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| 3 | c---------------------------------------------------------------------- |
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| 4 | c LWTT computes the longwave transmission functions |
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| 5 | c for all the absorbers in all spectral intervals |
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| 6 | c using pade approximants and horner's algorithm |
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| 7 | c---------------------------------------------------------------------- |
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| 8 | |
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| 9 | implicit none |
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| 10 | |
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| 11 | #include "dimensions.h" |
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| 12 | #include "dimphys.h" |
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| 13 | #include "dimradmars.h" |
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| 14 | #include "yomlw.h" |
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| 15 | |
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| 16 | c---------------------------------------------------------------------- |
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| 17 | c 0.1 arguments |
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| 18 | c --------- |
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| 19 | c inputs: |
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| 20 | c ------- |
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| 21 | integer kdlon ! part of ngrid |
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| 22 | integer nu ! |
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| 23 | |
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| 24 | real u (ndlo2,nu) ! absorber amounts |
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| 25 | real up (ndlo2,nu) ! idem scaled by the pressure |
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| 26 | |
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| 27 | c outputs: |
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| 28 | c -------- |
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| 29 | real tr (ndlo2,nu) ! transmission functions |
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| 30 | |
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| 31 | c---------------------------------------------------------------------- |
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| 32 | c 0.2 local arrays |
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| 33 | c ------------ |
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| 34 | |
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| 35 | integer ja,jl |
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| 36 | |
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| 37 | real xn (ndlon) |
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| 38 | real xd (ndlon) |
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| 39 | real ueq (ndlon) |
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| 40 | |
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| 41 | c---------------------------------------------------------------------- |
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| 42 | c Transmission by the CO2 15 microns band: |
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| 43 | c ---------------------------------------- |
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| 44 | |
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| 45 | do ja=1,nu |
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| 46 | do jl=1,kdlon |
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| 47 | c equivalent absorber amount (Doppler effect) |
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| 48 | c -------------------------------------------- |
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| 49 | ueq(jl) = sqrt(up(jl,ja)) |
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| 50 | . +cst_voigt(1,ja)*u(jl,ja)**cst_voigt(2,ja) |
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| 51 | |
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| 52 | c Horner's algorithm |
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| 53 | c ------------------ |
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| 54 | xn(jl) = ga(1,ja) + |
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| 55 | . ueq(jl)*(ga(2,ja) + ueq(jl) * ga(3,ja) ) |
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| 56 | xd(jl) = gb(1,ja) + ueq(jl)*(gb(2,ja) + |
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| 57 | . ueq(jl) * ( gb(3,ja) + ueq(jl) )) |
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| 58 | tr(jl,ja) = xn(jl) / xd(jl) |
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| 59 | |
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| 60 | enddo |
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| 61 | enddo |
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| 62 | |
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| 63 | c---------------------------------------------------------------------- |
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| 64 | return |
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| 65 | end |
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