/[lmdze]/trunk/phylmd/Radlwsw/swtt.f
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Contents of /trunk/phylmd/Radlwsw/swtt.f

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Revision 81 - (show annotations)
Wed Mar 5 14:38:41 2014 UTC (10 years, 3 months ago) by guez
Original Path: trunk/phylmd/Radlwsw/swtt.f90
File size: 3727 byte(s) 
 Converted to free source form files which were still in fixed source
form. The conversion was done using the polish mode of the NAG Fortran
Compiler.

In addition to converting to free source form, the processing of the
files also:

-- indented the code (including comments);

-- set Fortran keywords to uppercase, and set all other identifiers
to lower case;

-- added qualifiers to end statements (for example "end subroutine
conflx", instead of "end");

-- changed the terminating statements of all DO loops so that each
loop ends with an ENDDO statement (instead of a labeled continue).
1 SUBROUTINE swtt(knu, ka, pu, ptr)
2 USE dimens_m
3 USE dimphy
4 USE raddim
5 IMPLICIT NONE
6
7 ! -----------------------------------------------------------------------
8 ! PURPOSE.
9 ! --------
10 ! THIS ROUTINE COMPUTES THE TRANSMISSION FUNCTIONS FOR ALL THE
11 ! ABSORBERS (H2O, UNIFORMLY MIXED GASES, AND O3) IN THE TWO SPECTRAL
12 ! INTERVALS.
13
14 ! METHOD.
15 ! -------
16
17 ! TRANSMISSION FUNCTION ARE COMPUTED USING PADE APPROXIMANTS
18 ! AND HORNER'S ALGORITHM.
19
20 ! REFERENCE.
21 ! ----------
22
23 ! SEE RADIATION'S PART OF THE MODEL'S DOCUMENTATION AND
24 ! ECMWF RESEARCH DEPARTMENT DOCUMENTATION OF THE IFS
25
26 ! AUTHOR.
27 ! -------
28 ! JEAN-JACQUES MORCRETTE *ECMWF*
29
30 ! MODIFICATIONS.
31 ! --------------
32 ! ORIGINAL : 88-12-15
33 ! -----------------------------------------------------------------------
34
35 ! * ARGUMENTS
36
37 INTEGER knu ! INDEX OF THE SPECTRAL INTERVAL
38 INTEGER ka ! INDEX OF THE ABSORBER
39 DOUBLE PRECISION pu(kdlon) ! ABSORBER AMOUNT
40
41 DOUBLE PRECISION ptr(kdlon) ! TRANSMISSION FUNCTION
42
43 ! * LOCAL VARIABLES:
44
45 DOUBLE PRECISION zr1(kdlon), zr2(kdlon)
46 INTEGER jl, i, j
47
48 ! * Prescribed Data:
49
50 DOUBLE PRECISION apad(2, 3, 7), bpad(2, 3, 7), d(2, 3)
51 SAVE apad, bpad, d
52 DATA ((apad(1,i,j),i=1,3), j=1, 7)/0.912418292E+05, 0.000000000E-00, &
53 0.925887084E-04, 0.723613782E+05, 0.000000000E-00, 0.129353723E-01, &
54 0.596037057E+04, 0.000000000E-00, 0.800821928E+00, 0.000000000E-00, &
55 0.000000000E-00, 0.242715973E+02, 0.000000000E-00, 0.000000000E-00, &
56 0.878331486E+02, 0.000000000E-00, 0.000000000E-00, 0.191559725E+02, &
57 0.000000000E-00, 0.000000000E-00, 0.000000000E+00/
58 DATA ((apad(2,i,j),i=1,3), j=1, 7)/0.376655383E-08, 0.739646016E-08, &
59 0.410177786E+03, 0.978576773E-04, 0.131849595E-03, 0.672595424E+02, &
60 0.387714006E+00, 0.437772681E+00, 0.000000000E-00, 0.118461660E+03, &
61 0.151345118E+03, 0.000000000E-00, 0.119079797E+04, 0.233628890E+04, &
62 0.000000000E-00, 0.293353397E+03, 0.797219934E+03, 0.000000000E-00, &
63 0.000000000E+00, 0.000000000E+00, 0.000000000E+00/
64
65 DATA ((bpad(1,i,j),i=1,3), j=1, 7)/0.912418292E+05, 0.000000000E-00, &
66 0.925887084E-04, 0.724555318E+05, 0.000000000E-00, 0.131812683E-01, &
67 0.602593328E+04, 0.000000000E-00, 0.812706117E+00, 0.100000000E+01, &
68 0.000000000E-00, 0.249863591E+02, 0.000000000E-00, 0.000000000E-00, &
69 0.931071925E+02, 0.000000000E-00, 0.000000000E-00, 0.252233437E+02, &
70 0.000000000E-00, 0.000000000E-00, 0.100000000E+01/
71 DATA ((bpad(2,i,j),i=1,3), j=1, 7)/0.376655383E-08, 0.739646016E-08, &
72 0.410177786E+03, 0.979023421E-04, 0.131861712E-03, 0.731185438E+02, &
73 0.388611139E+00, 0.437949001E+00, 0.100000000E+01, 0.120291383E+03, &
74 0.151692730E+03, 0.000000000E+00, 0.130531005E+04, 0.237071130E+04, &
75 0.000000000E+00, 0.415049409E+03, 0.867914360E+03, 0.000000000E+00, &
76 0.100000000E+01, 0.100000000E+01, 0.000000000E+00/
77
78 DATA (d(1,i), i=1, 3)/0.00, 0.00, 0.00/
79 DATA (d(2,i), i=1, 3)/0.000000000, 0.000000000, 0.800000000/
80
81 ! -----------------------------------------------------------------------
82
83 ! * 1. HORNER'S ALGORITHM TO COMPUTE TRANSMISSION FUNCTION
84
85
86 DO jl = 1, kdlon
87 zr1(jl) = apad(knu, ka, 1) + pu(jl)*(apad(knu,ka,2)+pu(jl)*(apad(knu,ka, &
88 3)+pu(jl)*(apad(knu,ka,4)+pu(jl)*(apad(knu,ka,5)+pu(jl)*(apad(knu,ka,6) &
89 +pu(jl)*(apad(knu,ka,7)))))))
90
91 zr2(jl) = bpad(knu, ka, 1) + pu(jl)*(bpad(knu,ka,2)+pu(jl)*(bpad(knu,ka, &
92 3)+pu(jl)*(bpad(knu,ka,4)+pu(jl)*(bpad(knu,ka,5)+pu(jl)*(bpad(knu,ka,6) &
93 +pu(jl)*(bpad(knu,ka,7)))))))
94
95
96 ! * 2. ADD THE BACKGROUND TRANSMISSION
97
98
99
100 ptr(jl) = (zr1(jl)/zr2(jl))*(1.-d(knu,ka)) + d(knu, ka)
101 END DO
102
103 RETURN
104 END SUBROUTINE swtt
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