/[MITgcm]/MITgcm_contrib/darwin2/pkg/radtrans/radtrans_sun2000.F
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Revision 1.1 - (hide annotations) (download)
Wed Apr 13 18:56:26 2011 UTC (14 years, 3 months ago) by jahn
Branch: MAIN
CVS Tags: ctrb_darwin2_ckpt64k_20130723, ctrb_darwin2_ckpt65w_20160512, ctrb_darwin2_ckpt65j_20150225, ctrb_darwin2_ckpt63l_20120405, ctrb_darwin2_ckpt66g_20170424, ctrb_darwin2_ckpt64h_20130528, ctrb_darwin2_ckpt66k_20171025, ctrb_darwin2_ckpt66n_20180118, ctrb_darwin2_ckpt62v_20110413, ctrb_darwin2_ckpt65v_20160409, ctrb_darwin2_ckpt65s_20160114, ctrb_darwin2_ckpt65_20140718, ctrb_darwin2_ckpt64m_20130820, ctrb_darwin2_ckpt66d_20170214, ctrb_darwin2_ckpt64r_20131210, ctrb_darwin2_ckpt65m_20150615, ctrb_darwin2_ckpt65q_20151118, ctrb_darwin2_ckpt65o_20150914, ctrb_darwin2_ckpt64f_20130405, ctrb_darwin2_ckpt63f_20111201, ctrb_darwin2_ckpt64a_20121116, ctrb_darwin2_ckpt65p_20151023, ctrb_darwin2_ckpt64n_20130826, ctrb_darwin2_ckpt65e_20140929, ctrb_darwin2_ckpt64o_20131024, ctrb_darwin2_ckpt64v_20140411, ctrb_darwin2_ckpt64z_20140711, ctrb_darwin2_ckpt65l_20150504, ctrb_darwin2_ckpt65z_20160929, ctrb_darwin2_ckpt65n_20150729, ctrb_darwin2_ckpt62y_20110526, ctrb_darwin2_ckpt64y_20140622, ctrb_darwin2_ckpt65d_20140915, ctrb_darwin2_ckpt64t_20140202, ctrb_darwin2_ckpt66h_20170602, ctrb_darwin2_ckpt64i_20130622, ctrb_darwin2_ckpt62x_20110513, ctrb_darwin2_ckpt64s_20140105, ctrb_darwin2_ckpt62w_20110426, ctrb_darwin2_ckpt64x_20140524, ctrb_darwin2_ckpt63o_20120629, ctrb_darwin2_ckpt64e_20130305, ctrb_darwin2_ckpt65x_20160612, ctrb_darwin2_ckpt66f_20170407, ctrb_darwin2_ckpt63c_20111011, ctrb_darwin2_ckpt63i_20120124, ctrb_darwin2_ckpt65g_20141120, ctrb_darwin2_ckpt63m_20120506, ctrb_darwin2_ckpt63s_20120908, ctrb_darwin2_ckpt65k_20150402, ctrb_darwin2_ckpt63e_20111107, ctrb_darwin2_ckpt64w_20140502, ctrb_darwin2_ckpt63b_20110830, ctrb_darwin2_ckpt63j_20120217, ctrb_darwin2_ckpt66a_20161020, ctrb_darwin2_ckpt63r_20120817, ctrb_darwin2_ckpt64g_20130503, ctrb_darwin2_ckpt64l_20130806, ctrb_darwin2_ckpt63g_20111220, ctrb_darwin2_ckpt65f_20141014, ctrb_darwin2_ckpt64c_20130120, ctrb_darwin2_ckpt63a_20110804, ctrb_darwin2_ckpt66b_20161219, ctrb_darwin2_ckpt64u_20140308, ctrb_darwin2_ckpt64j_20130704, ctrb_darwin2_ckpt65i_20150123, ctrb_darwin2_ckpt66j_20170815, ctrb_darwin2_ckpt65y_20160801, ctrb_darwin2_ckpt63h_20111230, ctrb_darwin2_ckpt63p_20120707, ctrb_darwin2_ckpt66c_20170121, ctrb_darwin2_ckpt65a_20140728, ctrb_darwin2_ckpt65b_20140812, ctrb_darwin2_ckpt65t_20160221, ctrb_darwin2_ckpt64p_20131118, ctrb_darwin2_ckpt63d_20111107, ctrb_darwin2_ckpt63q_20120731, ctrb_darwin2_ckpt63_20110728, ctrb_darwin2_ckpt64b_20121224, ctrb_darwin2_ckpt64d_20130219, ctrb_darwin2_ckpt66o_20180209, ctrb_darwin2_ckpt66e_20170314, ctrb_darwin2_ckpt64_20121012, ctrb_darwin2_ckpt64q_20131118, ctrb_darwin2_baseline, ctrb_darwin2_ckpt64p_20131024, ctrb_darwin2_ckpt65u_20160315, ctrb_darwin2_ckpt65r_20151221, ctrb_darwin2_ckpt66i_20170718, ctrb_darwin2_ckpt63n_20120604, ctrb_darwin2_ckpt63k_20120317, ctrb_darwin2_ckpt65c_20140830, ctrb_darwin2_ckpt62z_20110622, ctrb_darwin2_ckpt66l_20171025, ctrb_darwin2_ckpt65h_20141217, ctrb_darwin2_ckpt66m_20171213, HEAD 
darwin2 initial checkin
1 jahn 1.1 C $Header$
2     C $Name$
3    
4     #include "RADTRANS_OPTIONS.h"
5    
6     CBOP
7     C !ROUTINE: RADTRANS_SUN2000
8    
9     C !INTERFACE: ======================================================
10     subroutine radtrans_sun2000 (radeg, iyr, imon, iday, sec,
11     O sunvec, rs)
12    
13     C !DESCRIPTION:
14     c This subroutine computes the Sun vector in geocentric inertial
15     c (equatorial) coodinates. It uses the model referenced in The
16     c Astronomical Almanac for 1984, Section S (Supplement) and documented
17     c in Exact closed-form geolocation algorithm for Earth survey
18     c sensors, by F.S. Patt and W.W. Gregg, Int. Journal of Remote
19     c Sensing, 1993. The accuracy of the Sun vector is approximately 0.1
20     c arcminute.
21     c
22     c Arguments:
23     c
24     c Name Type I/O Description
25     c --------------------------------------------------------
26     c IYR I*4 I Year, four digits (i.e, 1993)
27     c IDAY I*4 I Day of year (1-366)
28     c SEC R*8 I Seconds of day
29     c SUN(3) R*8 O Unit Sun vector in geocentric inertial
30     c coordinates of date
31     c RS R*8 O Magnitude of the Sun vector (AU)
32     c
33     c Subprograms referenced:
34     c
35     c JD Computes Julian day from calendar date
36     c EPHPARMS Computes mean solar longitude and anomaly and
37     c mean lunar lontitude and ascending node
38     c NUTATE Compute nutation corrections to lontitude and
39     c obliquity
40     c
41     c Coded by: Frederick S. Patt, GSC, November 2, 1992
42     c Modified to include Earth constants subroutine by W. Gregg,
43     c May 11, 1993.
44    
45     C !USES: ===========================================================
46     IMPLICIT NONE
47     #include "RADTRANS_VARS.h"
48    
49     C !INPUT PARAMETERS: ===============================================
50     INTEGER iyr, imon, iday
51     _RL radeg, sec
52     c INTEGER myThid
53    
54     C !OUTPUT PARAMETERS: ==============================================
55     _RL sunvec(3), rs
56    
57     C !FUNCTIONS: ======================================================
58     INTEGER radtrans_jd
59     EXTERNAL radtrans_jd
60    
61     C !LOCAL VARIABLES: ================================================
62     INTEGER nt
63     _RL xk,rjd,t,xls,gs,xlm,omega,g2,g4,g5,dls,xlsg,xlsa
64     parameter (xk=0.0056932) !Constant of aberration
65     CEOP
66    
67     c Compute floating point days since Jan 1.5, 2000
68     c Note that the Julian day starts at noon on the specified date
69     rjd = float(radtrans_jd(iyr,imon,iday))
70     t = rjd - 2451545.0D0 + (sec-43200.0D0)/86400.0D0
71    
72     c Compute solar ephemeris parameters
73     call radtrans_ephparms (t, xls, gs, xlm, omega)
74    
75     c Check if need to compute nutation corrections for this day
76     nt = int(t)
77     if (nt.ne.nutime) then
78     nutime = nt
79     call radtrans_nutate (radeg, t, xls, gs, xlm, omega, dpsi, eps)
80     end if
81    
82     c Compute planet mean anomalies
83     c Venus Mean Anomaly
84     g2 = 50.40828D0 + 1.60213022D0*t
85     g2 = mod(g2,360.0)
86    
87     c Mars Mean Anomaly
88     g4 = 19.38816D0 + 0.52402078D0*t
89     g4 = mod(g4,360.0)
90    
91     c Jupiter Mean Anomaly
92     g5 = 20.35116D0 + 0.08309121D0*t
93     g5 = mod(g5,360.0)
94    
95     c Compute solar distance (AU)
96     rs = 1.00014D0 - 0.01671D0*cos(gs/radeg)
97     * - 0.00014D0*cos(2.0D0*gs/radeg)
98    
99     c Compute Geometric Solar Longitude
100     dls = (6893.0D0 - 4.6543463D-4*t)*sin(gs/radeg)
101     * + 72.0D0*sin(2.0D0*gs/radeg)
102     * - 7.0D0*cos((gs - g5)/radeg)
103     * + 6.0D0*sin((xlm - xls)/radeg)
104     * + 5.0D0*sin((4.0D0*gs - 8.0D0*g4 + 3.0D0*g5)/radeg)
105     * - 5.0D0*cos((2.0D0*gs - 2.0D0*g2)/radeg)
106     * - 4.0D0*sin((gs - g2)/radeg)
107     * + 4.0D0*cos((4.0D0*gs - 8.0D0*g4 + 3.0D0*g5)/radeg)
108     * + 3.0D0*sin((2.0D0*gs - 2.0D0*g2)/radeg)
109     * - 3.0D0*sin(g5/radeg)
110     * - 3.0D0*sin((2.0D0*gs - 2.0D0*g5)/radeg) !arcseconds
111    
112     xlsg = xls + dls/3600.0D0
113    
114     c Compute Apparent Solar Longitude; includes corrections for nutation
115     c in longitude and velocity aberration
116     xlsa = xlsg + dpsi - xk/rs
117    
118     c Compute unit Sun vector
119     sunvec(1) = cos(xlsa/radeg)
120     sunvec(2) = sin(xlsa/radeg)*cos(eps/radeg)
121     sunvec(3) = sin(xlsa/radeg)*sin(eps/radeg)
122     c type *,' Sunlon = ',xlsg,xlsa,eps
123    
124     return
125     end
126     c
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