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SUBROUTINE swtt(knu, ka, pu, ptr) |
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USE dimensions |
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USE dimphy |
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USE raddim |
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IMPLICIT NONE |
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! ----------------------------------------------------------------------- |
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! PURPOSE. |
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! -------- |
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! THIS ROUTINE COMPUTES THE TRANSMISSION FUNCTIONS FOR ALL THE |
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! ABSORBERS (H2O, UNIFORMLY MIXED GASES, AND O3) IN THE TWO SPECTRAL |
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! INTERVALS. |
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! METHOD. |
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! ------- |
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! TRANSMISSION FUNCTION ARE COMPUTED USING PADE APPROXIMANTS |
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! AND HORNER'S ALGORITHM. |
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! REFERENCE. |
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! ---------- |
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! SEE RADIATION'S PART OF THE MODEL'S DOCUMENTATION AND |
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! ECMWF RESEARCH DEPARTMENT DOCUMENTATION OF THE IFS |
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! AUTHOR. |
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! ------- |
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! JEAN-JACQUES MORCRETTE *ECMWF* |
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! MODIFICATIONS. |
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! -------------- |
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! ORIGINAL : 88-12-15 |
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! ----------------------------------------------------------------------- |
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! * ARGUMENTS |
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INTEGER knu ! INDEX OF THE SPECTRAL INTERVAL |
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INTEGER ka ! INDEX OF THE ABSORBER |
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DOUBLE PRECISION pu(kdlon) ! ABSORBER AMOUNT |
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DOUBLE PRECISION ptr(kdlon) ! TRANSMISSION FUNCTION |
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! * LOCAL VARIABLES: |
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DOUBLE PRECISION zr1(kdlon), zr2(kdlon) |
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INTEGER jl, i, j |
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! * Prescribed Data: |
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DOUBLE PRECISION apad(2, 3, 7), bpad(2, 3, 7), d(2, 3) |
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SAVE apad, bpad, d |
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DATA ((apad(1,i,j),i=1,3), j=1, 7)/0.912418292D+05, 0.000000000D-00, & |
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0.925887084D-04, 0.723613782D+05, 0.000000000D-00, 0.129353723D-01, & |
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0.596037057D+04, 0.000000000D-00, 0.800821928D+00, 0.000000000D-00, & |
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0.000000000D-00, 0.242715973D+02, 0.000000000D-00, 0.000000000D-00, & |
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0.878331486D+02, 0.000000000D-00, 0.000000000D-00, 0.191559725D+02, & |
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0.000000000D-00, 0.000000000D-00, 0.000000000D+00/ |
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DATA ((apad(2,i,j),i=1,3), j=1, 7)/0.376655383D-08, 0.739646016D-08, & |
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0.410177786D+03, 0.978576773D-04, 0.131849595D-03, 0.672595424D+02, & |
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0.387714006D+00, 0.437772681D+00, 0.000000000D-00, 0.118461660D+03, & |
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0.151345118D+03, 0.000000000D-00, 0.119079797D+04, 0.233628890D+04, & |
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0.000000000D-00, 0.293353397D+03, 0.797219934D+03, 0.000000000D-00, & |
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0.000000000D+00, 0.000000000D+00, 0.000000000D+00/ |
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DATA ((bpad(1,i,j),i=1,3), j=1, 7)/0.912418292D+05, 0.000000000D-00, & |
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0.925887084D-04, 0.724555318D+05, 0.000000000D-00, 0.131812683D-01, & |
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0.602593328D+04, 0.000000000D-00, 0.812706117D+00, 0.100000000D+01, & |
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0.000000000D-00, 0.249863591D+02, 0.000000000D-00, 0.000000000D-00, & |
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0.931071925D+02, 0.000000000D-00, 0.000000000D-00, 0.252233437D+02, & |
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0.000000000D-00, 0.000000000D-00, 0.100000000D+01/ |
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DATA ((bpad(2,i,j),i=1,3), j=1, 7)/0.376655383D-08, 0.739646016D-08, & |
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0.410177786D+03, 0.979023421D-04, 0.131861712D-03, 0.731185438D+02, & |
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0.388611139D+00, 0.437949001D+00, 0.100000000D+01, 0.120291383D+03, & |
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0.151692730D+03, 0.000000000D+00, 0.130531005D+04, 0.237071130D+04, & |
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0.000000000D+00, 0.415049409D+03, 0.867914360D+03, 0.000000000D+00, & |
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0.100000000D+01, 0.100000000D+01, 0.000000000D+00/ |
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DATA (d(1,i), i=1, 3)/0.00d0, 0.00d0, 0.00d0/ |
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DATA (d(2,i), i=1, 3)/0.000000000d0, 0.000000000d0, 0.800000000d0/ |
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! ----------------------------------------------------------------------- |
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! * 1. HORNER'S ALGORITHM TO COMPUTE TRANSMISSION FUNCTION |
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DO jl = 1, kdlon |
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zr1(jl) = apad(knu, ka, 1) + pu(jl)*(apad(knu,ka,2)+pu(jl)*(apad(knu,ka, & |
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3)+pu(jl)*(apad(knu,ka,4)+pu(jl)*(apad(knu,ka,5)+pu(jl)*(apad(knu,ka,6) & |
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+pu(jl)*(apad(knu,ka,7))))))) |
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zr2(jl) = bpad(knu, ka, 1) + pu(jl)*(bpad(knu,ka,2)+pu(jl)*(bpad(knu,ka, & |
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3)+pu(jl)*(bpad(knu,ka,4)+pu(jl)*(bpad(knu,ka,5)+pu(jl)*(bpad(knu,ka,6) & |
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+pu(jl)*(bpad(knu,ka,7))))))) |
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! * 2. ADD THE BACKGROUND TRANSMISSION |
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ptr(jl) = (zr1(jl)/zr2(jl))*(1.-d(knu,ka)) + d(knu, ka) |
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END DO |
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RETURN |
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END SUBROUTINE swtt |
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