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optics_lib.F90 @ 5452

Last change on this file since 5452 was 1910, checked in by Laurent Fairhead, 11 years ago
Merged trunk changes r1860:1909 into testing branch
Property copyright set to Name of program: LMDZ Creation date: 1984 Version: LMDZ5 License: CeCILL version 2 Holder: Laboratoire de m\'et\'eorologie dynamique, CNRS, UMR 8539 See the license file in the root directory
File size: 35.0 KB

Line
1	! OPTICS_LIB: Optical proecures for for F90
2	! Compiled/Modified:
3	! 07/01/06 John Haynes (haynes@atmos.colostate.edu)
4	!
5	! m_wat (subroutine)
6	! m_ice (subroutine)
7	! mie_int (subroutine)
8
9	module optics_lib
10	implicit none
11
12	contains
13
14	! ----------------------------------------------------------------------------
15	! subroutine M_WAT
16	! ----------------------------------------------------------------------------
17	subroutine m_wat(freq, t, n_r, n_i)
18	implicit none
19	!
20	! Purpose:
21	! compute complex index of refraction of liquid water
22	!
23	! Inputs:
24	! [freq] frequency (GHz)
25	! [t] temperature (C)
26	!
27	! Outputs:
28	! [n_r] real part index of refraction
29	! [n_i] imaginary part index of refraction
30	!
31	! Reference:
32	! Based on the work of Ray (1972)
33	!
34	! Coded:
35	! 03/22/05 John Haynes (haynes@atmos.colostate.edu)
36
37	! ----- INPUTS -----
38	real*8, intent(in) :: freq,t
39
40	! ----- OUTPUTS -----
41	real*8, intent(out) :: n_r, n_i
42
43	! ----- INTERNAL -----
44	real*8 ld,es,ei,a,ls,sg,tm1,cos1,sin1
45	real*8 e_r,e_i
46	real*8 pi
47	complex*16 e_comp, sq
48
49	ld = 100.2.99792458E8/(freq1E9)
50	es = 78.54(1-(4.579E-3(t-25.)+1.19E-5(t-25.)*2 &
51	-2.8E-8(t-25.)*3))
52	ei = 5.27137+0.021647t-0.00131198t**2
53	a = -(16.8129/(t+273.))+0.0609265
54	ls = 0.00033836*exp(2513.98/(t+273.))
55	sg = 12.5664E8
56
57	tm1 = (ls/ld)**(1-a)
58	pi = acos(-1.D0)
59	cos1 = cos(0.5api)
60	sin1 = sin(0.5api)
61
62	e_r = ei + (((es-ei)(1.+tm1sin1))/(1.+2tm1sin1+tm1**2))
63	e_i = (((es-ei)tm1cos1)/(1.+2tm1sin1+tm1**2)) &
64	+((sg*ld)/1.885E11)
65
66	e_comp = dcmplx(e_r,e_i)
67	sq = sqrt(e_comp)
68
69	n_r = real(sq)
70	n_i = aimag(sq)
71
72	return
73	end subroutine m_wat
74
75	! ----------------------------------------------------------------------------
76	! subroutine M_ICE
77	! ----------------------------------------------------------------------------
78	subroutine m_ice(freq,t,n_r,n_i)
79	implicit none
80	!
81	! Purpose:
82	! compute complex index of refraction of ice
83	!
84	! Inputs:
85	! [freq] frequency (GHz)
86	! [t] temperature (C)
87	!
88	! Outputs:
89	! [n_r] real part index of refraction
90	! [n_i] imaginary part index of refraction
91	!
92	! Reference:
93	! Fortran 90 port from IDL of REFICE by Stephen G. Warren
94	!
95	! Modified:
96	! 05/31/05 John Haynes (haynes@atmos.colostate.edu)
97
98	! ----- INPUTS -----
99	real*8, intent(in) :: freq, t
100
101	! ----- OUTPUTS -----
102	real*8, intent(out) :: n_r,n_i
103
104	! Parameters:
105	integer*2 :: i,lt1,lt2,nwl,nwlt
106	parameter(nwl=468,nwlt=62)
107
108	real*8 :: alam,cutice,pi,t1,t2,tk,wlmax,wlmin, &
109	x,x1,x2,y,y1,y2,ylo,yhi
110
111	real*8 :: &
112	tabim(nwl),tabimt(nwlt,4),tabre(nwl),tabret(nwlt,4),temref(4), &
113	wl(nwl),wlt(nwlt)
114
115	! Defines wavelength dependent complex index of refraction for ice.
116	! Allowable wavelength range extends from 0.045 microns to 8.6 meter
117	! temperature dependence only considered beyond 167 microns.
118	!
119	! interpolation is done n_r vs. log(xlam)
120	! n_r vs. t
121	! log(n_i) vs. log(xlam)
122	! log(n_i) vs. t
123	!
124	! Stephen G. Warren - 1983
125	! Dept. of Atmospheric Sciences
126	! University of Washington
127	! Seattle, Wa 98195
128	!
129	! Based on
130	!
131	! Warren,S.G.,1984.
132	! Optical constants of ice from the ultraviolet to the microwave.
133	! Applied Optics,23,1206-1225
134	!
135	! Reference temperatures are -1.0,-5.0,-20.0, and -60.0 deg C
136
137	data temref/272.16,268.16,253.16,213.16/
138
139	data wlmin,wlmax/0.045,8.6e6/
140	data cutice/167.0/
141
142	data (wl(i),i=1,114)/ &
143	0.4430e-01,0.4510e-01,0.4590e-01,0.4680e-01,0.4770e-01,0.4860e-01, &
144	0.4960e-01,0.5060e-01,0.5170e-01,0.5280e-01,0.5390e-01,0.5510e-01, &
145	0.5640e-01,0.5770e-01,0.5900e-01,0.6050e-01,0.6200e-01,0.6360e-01, &
146	0.6530e-01,0.6700e-01,0.6890e-01,0.7080e-01,0.7290e-01,0.7380e-01, &
147	0.7510e-01,0.7750e-01,0.8000e-01,0.8270e-01,0.8550e-01,0.8860e-01, &
148	0.9180e-01,0.9300e-01,0.9540e-01,0.9920e-01,0.1033e+00,0.1078e+00, &
149	0.1100e+00,0.1127e+00,0.1140e+00,0.1181e+00,0.1210e+00,0.1240e+00, &
150	0.1272e+00,0.1295e+00,0.1305e+00,0.1319e+00,0.1333e+00,0.1348e+00, &
151	0.1362e+00,0.1370e+00,0.1378e+00,0.1387e+00,0.1393e+00,0.1409e+00, &
152	0.1425e+00,0.1435e+00,0.1442e+00,0.1450e+00,0.1459e+00,0.1468e+00, &
153	0.1476e+00,0.1480e+00,0.1485e+00,0.1494e+00,0.1512e+00,0.1531e+00, &
154	0.1540e+00,0.1550e+00,0.1569e+00,0.1580e+00,0.1589e+00,0.1610e+00, &
155	0.1625e+00,0.1648e+00,0.1669e+00,0.1692e+00,0.1713e+00,0.1737e+00, &
156	0.1757e+00,0.1779e+00,0.1802e+00,0.1809e+00,0.1821e+00,0.1833e+00, &
157	0.1843e+00,0.1850e+00,0.1860e+00,0.1870e+00,0.1880e+00,0.1890e+00, &
158	0.1900e+00,0.1910e+00,0.1930e+00,0.1950e+00,0.2100e+00,0.2500e+00, &
159	0.3000e+00,0.3500e+00,0.4000e+00,0.4100e+00,0.4200e+00,0.4300e+00, &
160	0.4400e+00,0.4500e+00,0.4600e+00,0.4700e+00,0.4800e+00,0.4900e+00, &
161	0.5000e+00,0.5100e+00,0.5200e+00,0.5300e+00,0.5400e+00,0.5500e+00/
162	data (wl(i),i=115,228)/ &
163	0.5600e+00,0.5700e+00,0.5800e+00,0.5900e+00,0.6000e+00,0.6100e+00, &
164	0.6200e+00,0.6300e+00,0.6400e+00,0.6500e+00,0.6600e+00,0.6700e+00, &
165	0.6800e+00,0.6900e+00,0.7000e+00,0.7100e+00,0.7200e+00,0.7300e+00, &
166	0.7400e+00,0.7500e+00,0.7600e+00,0.7700e+00,0.7800e+00,0.7900e+00, &
167	0.8000e+00,0.8100e+00,0.8200e+00,0.8300e+00,0.8400e+00,0.8500e+00, &
168	0.8600e+00,0.8700e+00,0.8800e+00,0.8900e+00,0.9000e+00,0.9100e+00, &
169	0.9200e+00,0.9300e+00,0.9400e+00,0.9500e+00,0.9600e+00,0.9700e+00, &
170	0.9800e+00,0.9900e+00,0.1000e+01,0.1010e+01,0.1020e+01,0.1030e+01, &
171	0.1040e+01,0.1050e+01,0.1060e+01,0.1070e+01,0.1080e+01,0.1090e+01, &
172	0.1100e+01,0.1110e+01,0.1120e+01,0.1130e+01,0.1140e+01,0.1150e+01, &
173	0.1160e+01,0.1170e+01,0.1180e+01,0.1190e+01,0.1200e+01,0.1210e+01, &
174	0.1220e+01,0.1230e+01,0.1240e+01,0.1250e+01,0.1260e+01,0.1270e+01, &
175	0.1280e+01,0.1290e+01,0.1300e+01,0.1310e+01,0.1320e+01,0.1330e+01, &
176	0.1340e+01,0.1350e+01,0.1360e+01,0.1370e+01,0.1380e+01,0.1390e+01, &
177	0.1400e+01,0.1410e+01,0.1420e+01,0.1430e+01,0.1440e+01,0.1449e+01, &
178	0.1460e+01,0.1471e+01,0.1481e+01,0.1493e+01,0.1504e+01,0.1515e+01, &
179	0.1527e+01,0.1538e+01,0.1563e+01,0.1587e+01,0.1613e+01,0.1650e+01, &
180	0.1680e+01,0.1700e+01,0.1730e+01,0.1760e+01,0.1800e+01,0.1830e+01, &
181	0.1840e+01,0.1850e+01,0.1855e+01,0.1860e+01,0.1870e+01,0.1890e+01/
182	data (wl(i),i=229,342)/ &
183	0.1905e+01,0.1923e+01,0.1942e+01,0.1961e+01,0.1980e+01,0.2000e+01, &
184	0.2020e+01,0.2041e+01,0.2062e+01,0.2083e+01,0.2105e+01,0.2130e+01, &
185	0.2150e+01,0.2170e+01,0.2190e+01,0.2220e+01,0.2240e+01,0.2245e+01, &
186	0.2250e+01,0.2260e+01,0.2270e+01,0.2290e+01,0.2310e+01,0.2330e+01, &
187	0.2350e+01,0.2370e+01,0.2390e+01,0.2410e+01,0.2430e+01,0.2460e+01, &
188	0.2500e+01,0.2520e+01,0.2550e+01,0.2565e+01,0.2580e+01,0.2590e+01, &
189	0.2600e+01,0.2620e+01,0.2675e+01,0.2725e+01,0.2778e+01,0.2817e+01, &
190	0.2833e+01,0.2849e+01,0.2865e+01,0.2882e+01,0.2899e+01,0.2915e+01, &
191	0.2933e+01,0.2950e+01,0.2967e+01,0.2985e+01,0.3003e+01,0.3021e+01, &
192	0.3040e+01,0.3058e+01,0.3077e+01,0.3096e+01,0.3115e+01,0.3135e+01, &
193	0.3155e+01,0.3175e+01,0.3195e+01,0.3215e+01,0.3236e+01,0.3257e+01, &
194	0.3279e+01,0.3300e+01,0.3322e+01,0.3345e+01,0.3367e+01,0.3390e+01, &
195	0.3413e+01,0.3436e+01,0.3460e+01,0.3484e+01,0.3509e+01,0.3534e+01, &
196	0.3559e+01,0.3624e+01,0.3732e+01,0.3775e+01,0.3847e+01,0.3969e+01, &
197	0.4099e+01,0.4239e+01,0.4348e+01,0.4387e+01,0.4444e+01,0.4505e+01, &
198	0.4547e+01,0.4560e+01,0.4580e+01,0.4719e+01,0.4904e+01,0.5000e+01, &
199	0.5100e+01,0.5200e+01,0.5263e+01,0.5400e+01,0.5556e+01,0.5714e+01, &
200	0.5747e+01,0.5780e+01,0.5814e+01,0.5848e+01,0.5882e+01,0.6061e+01, &
201	0.6135e+01,0.6250e+01,0.6289e+01,0.6329e+01,0.6369e+01,0.6410e+01/
202	data (wl(i),i=343,456)/ &
203	0.6452e+01,0.6494e+01,0.6579e+01,0.6667e+01,0.6757e+01,0.6897e+01, &
204	0.7042e+01,0.7143e+01,0.7246e+01,0.7353e+01,0.7463e+01,0.7576e+01, &
205	0.7692e+01,0.7812e+01,0.7937e+01,0.8065e+01,0.8197e+01,0.8333e+01, &
206	0.8475e+01,0.8696e+01,0.8929e+01,0.9091e+01,0.9259e+01,0.9524e+01, &
207	0.9804e+01,0.1000e+02,0.1020e+02,0.1031e+02,0.1042e+02,0.1053e+02, &
208	0.1064e+02,0.1075e+02,0.1087e+02,0.1100e+02,0.1111e+02,0.1136e+02, &
209	0.1163e+02,0.1190e+02,0.1220e+02,0.1250e+02,0.1282e+02,0.1299e+02, &
210	0.1316e+02,0.1333e+02,0.1351e+02,0.1370e+02,0.1389e+02,0.1408e+02, &
211	0.1429e+02,0.1471e+02,0.1515e+02,0.1538e+02,0.1563e+02,0.1613e+02, &
212	0.1639e+02,0.1667e+02,0.1695e+02,0.1724e+02,0.1818e+02,0.1887e+02, &
213	0.1923e+02,0.1961e+02,0.2000e+02,0.2041e+02,0.2083e+02,0.2222e+02, &
214	0.2260e+02,0.2305e+02,0.2360e+02,0.2460e+02,0.2500e+02,0.2600e+02, &
215	0.2857e+02,0.3100e+02,0.3333e+02,0.3448e+02,0.3564e+02,0.3700e+02, &
216	0.3824e+02,0.3960e+02,0.4114e+02,0.4276e+02,0.4358e+02,0.4458e+02, &
217	0.4550e+02,0.4615e+02,0.4671e+02,0.4736e+02,0.4800e+02,0.4878e+02, &
218	0.5003e+02,0.5128e+02,0.5275e+02,0.5350e+02,0.5424e+02,0.5500e+02, &
219	0.5574e+02,0.5640e+02,0.5700e+02,0.5746e+02,0.5840e+02,0.5929e+02, &
220	0.6000e+02,0.6100e+02,0.6125e+02,0.6250e+02,0.6378e+02,0.6467e+02, &
221	0.6558e+02,0.6655e+02,0.6760e+02,0.6900e+02,0.7053e+02,0.7300e+02/
222	data (wl(i),i=457,468)/ &
223	0.7500e+02,0.7629e+02,0.8000e+02,0.8297e+02,0.8500e+02,0.8680e+02, &
224	0.9080e+02,0.9517e+02,0.1000e+03,0.1200e+03,0.1500e+03,0.1670e+03/
225	data wlt/ &
226	0.1670e+03,0.1778e+03,0.1884e+03, &
227	0.1995e+03,0.2113e+03,0.2239e+03,0.2371e+03,0.2512e+03,0.2661e+03, &
228	0.2818e+03,0.2985e+03,0.3162e+03,0.3548e+03,0.3981e+03,0.4467e+03, &
229	0.5012e+03,0.5623e+03,0.6310e+03,0.7943e+03,0.1000e+04,0.1259e+04, &
230	0.2500e+04,0.5000e+04,0.1000e+05,0.2000e+05,0.3200e+05,0.3500e+05, &
231	0.4000e+05,0.4500e+05,0.5000e+05,0.6000e+05,0.7000e+05,0.9000e+05, &
232	0.1110e+06,0.1200e+06,0.1300e+06,0.1400e+06,0.1500e+06,0.1600e+06, &
233	0.1700e+06,0.1800e+06,0.2000e+06,0.2500e+06,0.2900e+06,0.3200e+06, &
234	0.3500e+06,0.3800e+06,0.4000e+06,0.4500e+06,0.5000e+06,0.6000e+06, &
235	0.6400e+06,0.6800e+06,0.7200e+06,0.7600e+06,0.8000e+06,0.8400e+06, &
236	0.9000e+06,0.1000e+07,0.2000e+07,0.5000e+07,0.8600e+07/
237	data (tabre(i),i=1,114)/ &
238	0.83441, 0.83676, 0.83729, 0.83771, 0.83827, 0.84038, &
239	0.84719, 0.85522, 0.86047, 0.86248, 0.86157, 0.86093, &
240	0.86419, 0.86916, 0.87764, 0.89296, 0.91041, 0.93089, &
241	0.95373, 0.98188, 1.02334, 1.06735, 1.11197, 1.13134, &
242	1.15747, 1.20045, 1.23840, 1.27325, 1.32157, 1.38958, &
243	1.41644, 1.40906, 1.40063, 1.40169, 1.40934, 1.40221, &
244	1.39240, 1.38424, 1.38075, 1.38186, 1.39634, 1.40918, &
245	1.40256, 1.38013, 1.36303, 1.34144, 1.32377, 1.30605, &
246	1.29054, 1.28890, 1.28931, 1.30190, 1.32025, 1.36302, &
247	1.41872, 1.45834, 1.49028, 1.52128, 1.55376, 1.57782, &
248	1.59636, 1.60652, 1.61172, 1.61919, 1.62522, 1.63404, &
249	1.63689, 1.63833, 1.63720, 1.63233, 1.62222, 1.58269, &
250	1.55635, 1.52453, 1.50320, 1.48498, 1.47226, 1.45991, &
251	1.45115, 1.44272, 1.43498, 1.43280, 1.42924, 1.42602, &
252	1.42323, 1.42143, 1.41897, 1.41660, 1.41434, 1.41216, &
253	1.41006, 1.40805, 1.40423, 1.40067, 1.38004, 1.35085, &
254	1.33394, 1.32492, 1.31940, 1.31854, 1.31775, 1.31702, &
255	1.31633, 1.31569, 1.31509, 1.31452, 1.31399, 1.31349, &
256	1.31302, 1.31257, 1.31215, 1.31175, 1.31136, 1.31099/
257	data (tabre(i),i=115,228)/ &
258	1.31064, 1.31031, 1.30999, 1.30968, 1.30938, 1.30909, &
259	1.30882, 1.30855, 1.30829, 1.30804, 1.30780, 1.30756, &
260	1.30733, 1.30710, 1.30688, 1.30667, 1.30646, 1.30625, &
261	1.30605, 1.30585, 1.30566, 1.30547, 1.30528, 1.30509, &
262	1.30491, 1.30473, 1.30455, 1.30437, 1.30419, 1.30402, &
263	1.30385, 1.30367, 1.30350, 1.30333, 1.30316, 1.30299, &
264	1.30283, 1.30266, 1.30249, 1.30232, 1.30216, 1.30199, &
265	1.30182, 1.30166, 1.30149, 1.30132, 1.30116, 1.30099, &
266	1.30082, 1.30065, 1.30048, 1.30031, 1.30014, 1.29997, &
267	1.29979, 1.29962, 1.29945, 1.29927, 1.29909, 1.29891, &
268	1.29873, 1.29855, 1.29837, 1.29818, 1.29800, 1.29781, &
269	1.29762, 1.29743, 1.29724, 1.29705, 1.29686, 1.29666, &
270	1.29646, 1.29626, 1.29605, 1.29584, 1.29563, 1.29542, &
271	1.29521, 1.29499, 1.29476, 1.29453, 1.29430, 1.29406, &
272	1.29381, 1.29355, 1.29327, 1.29299, 1.29272, 1.29252, &
273	1.29228, 1.29205, 1.29186, 1.29167, 1.29150, 1.29130, &
274	1.29106, 1.29083, 1.29025, 1.28962, 1.28891, 1.28784, &
275	1.28689, 1.28623, 1.28521, 1.28413, 1.28261, 1.28137, &
276	1.28093, 1.28047, 1.28022, 1.27998, 1.27948, 1.27849/
277	data (tabre(i),i=229,342)/ &
278	1.27774, 1.27691, 1.27610, 1.27535, 1.27471, 1.27404, &
279	1.27329, 1.27240, 1.27139, 1.27029, 1.26901, 1.26736, &
280	1.26591, 1.26441, 1.26284, 1.26036, 1.25860, 1.25815, &
281	1.25768, 1.25675, 1.25579, 1.25383, 1.25179, 1.24967, &
282	1.24745, 1.24512, 1.24266, 1.24004, 1.23725, 1.23270, &
283	1.22583, 1.22198, 1.21548, 1.21184, 1.20790, 1.20507, &
284	1.20209, 1.19566, 1.17411, 1.14734, 1.10766, 1.06739, &
285	1.04762, 1.02650, 1.00357, 0.98197, 0.96503, 0.95962, &
286	0.97269, 0.99172, 1.00668, 1.02186, 1.04270, 1.07597, &
287	1.12954, 1.21267, 1.32509, 1.42599, 1.49656, 1.55095, &
288	1.59988, 1.63631, 1.65024, 1.64278, 1.62691, 1.61284, &
289	1.59245, 1.57329, 1.55770, 1.54129, 1.52654, 1.51139, &
290	1.49725, 1.48453, 1.47209, 1.46125, 1.45132, 1.44215, &
291	1.43366, 1.41553, 1.39417, 1.38732, 1.37735, 1.36448, &
292	1.35414, 1.34456, 1.33882, 1.33807, 1.33847, 1.34053, &
293	1.34287, 1.34418, 1.34634, 1.34422, 1.33453, 1.32897, &
294	1.32333, 1.31800, 1.31432, 1.30623, 1.29722, 1.28898, &
295	1.28730, 1.28603, 1.28509, 1.28535, 1.28813, 1.30156, &
296	1.30901, 1.31720, 1.31893, 1.32039, 1.32201, 1.32239/
297	data (tabre(i),i=343,456)/ &
298	1.32149, 1.32036, 1.31814, 1.31705, 1.31807, 1.31953, &
299	1.31933, 1.31896, 1.31909, 1.31796, 1.31631, 1.31542, &
300	1.31540, 1.31552, 1.31455, 1.31193, 1.30677, 1.29934, &
301	1.29253, 1.28389, 1.27401, 1.26724, 1.25990, 1.24510, &
302	1.22241, 1.19913, 1.17150, 1.15528, 1.13700, 1.11808, &
303	1.10134, 1.09083, 1.08734, 1.09254, 1.10654, 1.14779, &
304	1.20202, 1.25825, 1.32305, 1.38574, 1.44478, 1.47170, &
305	1.49619, 1.51652, 1.53328, 1.54900, 1.56276, 1.57317, &
306	1.58028, 1.57918, 1.56672, 1.55869, 1.55081, 1.53807, &
307	1.53296, 1.53220, 1.53340, 1.53289, 1.51705, 1.50097, &
308	1.49681, 1.49928, 1.50153, 1.49856, 1.49053, 1.46070, &
309	1.45182, 1.44223, 1.43158, 1.41385, 1.40676, 1.38955, &
310	1.34894, 1.31039, 1.26420, 1.23656, 1.21663, 1.20233, &
311	1.19640, 1.19969, 1.20860, 1.22173, 1.24166, 1.28175, &
312	1.32784, 1.38657, 1.46486, 1.55323, 1.60379, 1.61877, &
313	1.62963, 1.65712, 1.69810, 1.72065, 1.74865, 1.76736, &
314	1.76476, 1.75011, 1.72327, 1.68490, 1.62398, 1.59596, &
315	1.58514, 1.59917, 1.61405, 1.66625, 1.70663, 1.73713, &
316	1.76860, 1.80343, 1.83296, 1.85682, 1.87411, 1.89110/
317	data (tabre(i),i=457,468)/ &
318	1.89918, 1.90432, 1.90329, 1.88744, 1.87499, 1.86702, &
319	1.85361, 1.84250, 1.83225, 1.81914, 1.82268, 1.82961/
320	data (tabret(i,1),i=1,nwlt)/ &
321	1.82961, 1.83258, 1.83149, &
322	1.82748, 1.82224, 1.81718, 1.81204, 1.80704, 1.80250, &
323	1.79834, 1.79482, 1.79214, 1.78843, 1.78601, 1.78434, &
324	1.78322, 1.78248, 1.78201, 1.78170, 1.78160, 1.78190, &
325	1.78300, 1.78430, 1.78520, 1.78620, 1.78660, 1.78680, &
326	1.78690, 1.78700, 1.78700, 1.78710, 1.78710, 1.78720, &
327	1.78720, 1.78720, 1.78720, 1.78720, 1.78720, 1.78720, &
328	1.78720, 1.78720, 1.78720, 1.78720, 1.78720, 1.78720, &
329	1.78720, 1.78720, 1.78720, 1.78720, 1.78720, 1.78720, &
330	1.78720, 1.78720, 1.78720, 1.78720, 1.78720, 1.78720, &
331	1.78720, 1.78720, 1.78720, 1.78720, 1.78800/
332	data (tabret(i,2),i=1,nwlt)/ &
333	1.82961, 1.83258, 1.83149, 1.82748, &
334	1.82224, 1.81718, 1.81204, 1.80704, 1.80250, 1.79834, &
335	1.79482, 1.79214, 1.78843, 1.78601, 1.78434, 1.78322, &
336	1.78248, 1.78201, 1.78170, 1.78160, 1.78190, 1.78300, &
337	1.78430, 1.78520, 1.78610, 1.78630, 1.78640, 1.78650, &
338	1.78650, 1.78650, 1.78650, 1.78650, 1.78650, 1.78650, &
339	1.78650, 1.78650, 1.78650, 1.78650, 1.78650, 1.78650, &
340	1.78650, 1.78650, 1.78650, 1.78650, 1.78650, 1.78650, &
341	1.78650, 1.78650, 1.78650, 1.78650, 1.78650, 1.78650, &
342	1.78650, 1.78650, 1.78650, 1.78650, 1.78650, 1.78650, &
343	1.78650, 1.78650, 1.78650, 1.78720/
344	data(tabret(i,3),i=1,nwlt)/ &
345	1.82961, 1.83258, 1.83149, 1.82748, 1.82224, &
346	1.81718, 1.81204, 1.80704, 1.80250, 1.79834, 1.79482, &
347	1.79214, 1.78843, 1.78601, 1.78434, 1.78322, 1.78248, &
348	1.78201, 1.78160, 1.78140, 1.78160, 1.78220, 1.78310, &
349	1.78380, 1.78390, 1.78400, 1.78400, 1.78400, 1.78400, &
350	1.78400, 1.78390, 1.78380, 1.78370, 1.78370, 1.78370, &
351	1.78370, 1.78370, 1.78370, 1.78370, 1.78370, 1.78370, &
352	1.78370, 1.78370, 1.78370, 1.78370, 1.78370, 1.78370, &
353	1.78370, 1.78370, 1.78370, 1.78370, 1.78370, 1.78370, &
354	1.78370, 1.78370, 1.78370, 1.78370, 1.78370, 1.78370, &
355	1.78370, 1.78400, 1.78450/
356	data (tabret(i,4),i=1,nwlt)/ &
357	1.82961, 1.83258, 1.83149, 1.82748, 1.82224, 1.81718, &
358	1.81204, 1.80704, 1.80250, 1.79834, 1.79482, 1.79214, &
359	1.78843, 1.78601, 1.78434, 1.78322, 1.78248, 1.78201, &
360	1.78150, 1.78070, 1.78010, 1.77890, 1.77790, 1.77730, &
361	1.77720, 1.77720, 1.77720, 1.77720, 1.77720, 1.77720, &
362	1.77720, 1.77720, 1.77720, 1.77720, 1.77720, 1.77720, &
363	1.77720, 1.77720, 1.77720, 1.77720, 1.77720, 1.77720, &
364	1.77720, 1.77720, 1.77720, 1.77720, 1.77720, 1.77720, &
365	1.77720, 1.77720, 1.77720, 1.77720, 1.77720, 1.77720, &
366	1.77720, 1.77720, 1.77720, 1.77720, 1.77720, 1.77720, &
367	1.77720, 1.77800/
368	data(tabim(i),i=1,114)/ &
369	0.1640e+00,0.1730e+00,0.1830e+00,0.1950e+00,0.2080e+00,0.2230e+00, &
370	0.2400e+00,0.2500e+00,0.2590e+00,0.2680e+00,0.2790e+00,0.2970e+00, &
371	0.3190e+00,0.3400e+00,0.3660e+00,0.3920e+00,0.4160e+00,0.4400e+00, &
372	0.4640e+00,0.4920e+00,0.5170e+00,0.5280e+00,0.5330e+00,0.5340e+00, &
373	0.5310e+00,0.5240e+00,0.5100e+00,0.5000e+00,0.4990e+00,0.4680e+00, &
374	0.3800e+00,0.3600e+00,0.3390e+00,0.3180e+00,0.2910e+00,0.2510e+00, &
375	0.2440e+00,0.2390e+00,0.2390e+00,0.2440e+00,0.2470e+00,0.2240e+00, &
376	0.1950e+00,0.1740e+00,0.1720e+00,0.1800e+00,0.1940e+00,0.2130e+00, &
377	0.2430e+00,0.2710e+00,0.2890e+00,0.3340e+00,0.3440e+00,0.3820e+00, &
378	0.4010e+00,0.4065e+00,0.4050e+00,0.3890e+00,0.3770e+00,0.3450e+00, &
379	0.3320e+00,0.3150e+00,0.2980e+00,0.2740e+00,0.2280e+00,0.1980e+00, &
380	0.1720e+00,0.1560e+00,0.1100e+00,0.8300e-01,0.5800e-01,0.2200e-01, &
381	0.1000e-01,0.3000e-02,0.1000e-02,0.3000e-03,0.1000e-03,0.3000e-04, &
382	0.1000e-04,0.3000e-05,0.1000e-05,0.7000e-06,0.4000e-06,0.2000e-06, &
383	0.1000e-06,0.6377e-07,0.3750e-07,0.2800e-07,0.2400e-07,0.2200e-07, &
384	0.1900e-07,0.1750e-07,0.1640e-07,0.1590e-07,0.1325e-07,0.8623e-08, &
385	0.5504e-08,0.3765e-08,0.2710e-08,0.2510e-08,0.2260e-08,0.2080e-08, &
386	0.1910e-08,0.1540e-08,0.1530e-08,0.1550e-08,0.1640e-08,0.1780e-08, &
387	0.1910e-08,0.2140e-08,0.2260e-08,0.2540e-08,0.2930e-08,0.3110e-08/
388	data(tabim(i),i=115,228)/ &
389	0.3290e-08,0.3520e-08,0.4040e-08,0.4880e-08,0.5730e-08,0.6890e-08, &
390	0.8580e-08,0.1040e-07,0.1220e-07,0.1430e-07,0.1660e-07,0.1890e-07, &
391	0.2090e-07,0.2400e-07,0.2900e-07,0.3440e-07,0.4030e-07,0.4300e-07, &
392	0.4920e-07,0.5870e-07,0.7080e-07,0.8580e-07,0.1020e-06,0.1180e-06, &
393	0.1340e-06,0.1400e-06,0.1430e-06,0.1450e-06,0.1510e-06,0.1830e-06, &
394	0.2150e-06,0.2650e-06,0.3350e-06,0.3920e-06,0.4200e-06,0.4440e-06, &
395	0.4740e-06,0.5110e-06,0.5530e-06,0.6020e-06,0.7550e-06,0.9260e-06, &
396	0.1120e-05,0.1330e-05,0.1620e-05,0.2000e-05,0.2250e-05,0.2330e-05, &
397	0.2330e-05,0.2170e-05,0.1960e-05,0.1810e-05,0.1740e-05,0.1730e-05, &
398	0.1700e-05,0.1760e-05,0.1820e-05,0.2040e-05,0.2250e-05,0.2290e-05, &
399	0.3040e-05,0.3840e-05,0.4770e-05,0.5760e-05,0.6710e-05,0.8660e-05, &
400	0.1020e-04,0.1130e-04,0.1220e-04,0.1290e-04,0.1320e-04,0.1350e-04, &
401	0.1330e-04,0.1320e-04,0.1320e-04,0.1310e-04,0.1320e-04,0.1320e-04, &
402	0.1340e-04,0.1390e-04,0.1420e-04,0.1480e-04,0.1580e-04,0.1740e-04, &
403	0.1980e-04,0.2500e-04,0.5400e-04,0.1040e-03,0.2030e-03,0.2708e-03, &
404	0.3511e-03,0.4299e-03,0.5181e-03,0.5855e-03,0.5899e-03,0.5635e-03, &
405	0.5480e-03,0.5266e-03,0.4394e-03,0.3701e-03,0.3372e-03,0.2410e-03, &
406	0.1890e-03,0.1660e-03,0.1450e-03,0.1280e-03,0.1030e-03,0.8600e-04, &
407	0.8220e-04,0.8030e-04,0.8500e-04,0.9900e-04,0.1500e-03,0.2950e-03/
408	data(tabim(i),i=229,342)/ &
409	0.4687e-03,0.7615e-03,0.1010e-02,0.1313e-02,0.1539e-02,0.1588e-02, &
410	0.1540e-02,0.1412e-02,0.1244e-02,0.1068e-02,0.8414e-03,0.5650e-03, &
411	0.4320e-03,0.3500e-03,0.2870e-03,0.2210e-03,0.2030e-03,0.2010e-03, &
412	0.2030e-03,0.2140e-03,0.2320e-03,0.2890e-03,0.3810e-03,0.4620e-03, &
413	0.5480e-03,0.6180e-03,0.6800e-03,0.7300e-03,0.7820e-03,0.8480e-03, &
414	0.9250e-03,0.9200e-03,0.8920e-03,0.8700e-03,0.8900e-03,0.9300e-03, &
415	0.1010e-02,0.1350e-02,0.3420e-02,0.7920e-02,0.2000e-01,0.3800e-01, &
416	0.5200e-01,0.6800e-01,0.9230e-01,0.1270e+00,0.1690e+00,0.2210e+00, &
417	0.2760e+00,0.3120e+00,0.3470e+00,0.3880e+00,0.4380e+00,0.4930e+00, &
418	0.5540e+00,0.6120e+00,0.6250e+00,0.5930e+00,0.5390e+00,0.4910e+00, &
419	0.4380e+00,0.3720e+00,0.3000e+00,0.2380e+00,0.1930e+00,0.1580e+00, &
420	0.1210e+00,0.1030e+00,0.8360e-01,0.6680e-01,0.5400e-01,0.4220e-01, &
421	0.3420e-01,0.2740e-01,0.2200e-01,0.1860e-01,0.1520e-01,0.1260e-01, &
422	0.1060e-01,0.8020e-02,0.6850e-02,0.6600e-02,0.6960e-02,0.9160e-02, &
423	0.1110e-01,0.1450e-01,0.2000e-01,0.2300e-01,0.2600e-01,0.2900e-01, &
424	0.2930e-01,0.3000e-01,0.2850e-01,0.1730e-01,0.1290e-01,0.1200e-01, &
425	0.1250e-01,0.1340e-01,0.1400e-01,0.1750e-01,0.2400e-01,0.3500e-01, &
426	0.3800e-01,0.4200e-01,0.4600e-01,0.5200e-01,0.5700e-01,0.6900e-01, &
427	0.7000e-01,0.6700e-01,0.6500e-01,0.6400e-01,0.6200e-01,0.5900e-01/
428	data(tabim(i),i=343,456)/ &
429	0.5700e-01,0.5600e-01,0.5500e-01,0.5700e-01,0.5800e-01,0.5700e-01, &
430	0.5500e-01,0.5500e-01,0.5400e-01,0.5200e-01,0.5200e-01,0.5200e-01, &
431	0.5200e-01,0.5000e-01,0.4700e-01,0.4300e-01,0.3900e-01,0.3700e-01, &
432	0.3900e-01,0.4000e-01,0.4200e-01,0.4400e-01,0.4500e-01,0.4600e-01, &
433	0.4700e-01,0.5100e-01,0.6500e-01,0.7500e-01,0.8800e-01,0.1080e+00, &
434	0.1340e+00,0.1680e+00,0.2040e+00,0.2480e+00,0.2800e+00,0.3410e+00, &
435	0.3790e+00,0.4090e+00,0.4220e+00,0.4220e+00,0.4030e+00,0.3890e+00, &
436	0.3740e+00,0.3540e+00,0.3350e+00,0.3150e+00,0.2940e+00,0.2710e+00, &
437	0.2460e+00,0.1980e+00,0.1640e+00,0.1520e+00,0.1420e+00,0.1280e+00, &
438	0.1250e+00,0.1230e+00,0.1160e+00,0.1070e+00,0.7900e-01,0.7200e-01, &
439	0.7600e-01,0.7500e-01,0.6700e-01,0.5500e-01,0.4500e-01,0.2900e-01, &
440	0.2750e-01,0.2700e-01,0.2730e-01,0.2890e-01,0.3000e-01,0.3400e-01, &
441	0.5300e-01,0.7550e-01,0.1060e+00,0.1350e+00,0.1761e+00,0.2229e+00, &
442	0.2746e+00,0.3280e+00,0.3906e+00,0.4642e+00,0.5247e+00,0.5731e+00, &
443	0.6362e+00,0.6839e+00,0.7091e+00,0.6790e+00,0.6250e+00,0.5654e+00, &
444	0.5433e+00,0.5292e+00,0.5070e+00,0.4883e+00,0.4707e+00,0.4203e+00, &
445	0.3771e+00,0.3376e+00,0.3056e+00,0.2835e+00,0.3170e+00,0.3517e+00, &
446	0.3902e+00,0.4509e+00,0.4671e+00,0.4779e+00,0.4890e+00,0.4899e+00, &
447	0.4873e+00,0.4766e+00,0.4508e+00,0.4193e+00,0.3880e+00,0.3433e+00/
448	data(tabim(i),i=457,468)/ &
449	0.3118e+00,0.2935e+00,0.2350e+00,0.1981e+00,0.1865e+00,0.1771e+00, &
450	0.1620e+00,0.1490e+00,0.1390e+00,0.1200e+00,0.9620e-01,0.8300e-01/
451	data(tabimt(i,1),i=1,nwlt)/ &
452	0.8300e-01,0.6900e-01,0.5700e-01, &
453	0.4560e-01,0.3790e-01,0.3140e-01,0.2620e-01,0.2240e-01,0.1960e-01, &
454	0.1760e-01,0.1665e-01,0.1620e-01,0.1550e-01,0.1470e-01,0.1390e-01, &
455	0.1320e-01,0.1250e-01,0.1180e-01,0.1060e-01,0.9540e-02,0.8560e-02, &
456	0.6210e-02,0.4490e-02,0.3240e-02,0.2340e-02,0.1880e-02,0.1740e-02, &
457	0.1500e-02,0.1320e-02,0.1160e-02,0.8800e-03,0.6950e-03,0.4640e-03, &
458	0.3400e-03,0.3110e-03,0.2940e-03,0.2790e-03,0.2700e-03,0.2640e-03, &
459	0.2580e-03,0.2520e-03,0.2490e-03,0.2540e-03,0.2640e-03,0.2740e-03, &
460	0.2890e-03,0.3050e-03,0.3150e-03,0.3460e-03,0.3820e-03,0.4620e-03, &
461	0.5000e-03,0.5500e-03,0.5950e-03,0.6470e-03,0.6920e-03,0.7420e-03, &
462	0.8200e-03,0.9700e-03,0.1950e-02,0.5780e-02,0.9700e-02/
463	data(tabimt(i,2),i=1,nwlt)/ &
464	0.8300e-01,0.6900e-01,0.5700e-01,0.4560e-01, &
465	0.3790e-01,0.3140e-01,0.2620e-01,0.2240e-01,0.1960e-01,0.1760e-01, &
466	0.1665e-01,0.1600e-01,0.1500e-01,0.1400e-01,0.1310e-01,0.1230e-01, &
467	0.1150e-01,0.1080e-01,0.9460e-02,0.8290e-02,0.7270e-02,0.4910e-02, &
468	0.3300e-02,0.2220e-02,0.1490e-02,0.1140e-02,0.1060e-02,0.9480e-03, &
469	0.8500e-03,0.7660e-03,0.6300e-03,0.5200e-03,0.3840e-03,0.2960e-03, &
470	0.2700e-03,0.2520e-03,0.2440e-03,0.2360e-03,0.2300e-03,0.2280e-03, &
471	0.2250e-03,0.2200e-03,0.2160e-03,0.2170e-03,0.2200e-03,0.2250e-03, &
472	0.2320e-03,0.2390e-03,0.2600e-03,0.2860e-03,0.3560e-03,0.3830e-03, &
473	0.4150e-03,0.4450e-03,0.4760e-03,0.5080e-03,0.5400e-03,0.5860e-03, &
474	0.6780e-03,0.1280e-02,0.3550e-02,0.5600e-02/
475	data(tabimt(i,3),i=1,nwlt)/ &
476	0.8300e-01,0.6900e-01,0.5700e-01,0.4560e-01,0.3790e-01, &
477	0.3140e-01,0.2620e-01,0.2190e-01,0.1880e-01,0.1660e-01,0.1540e-01, &
478	0.1470e-01,0.1350e-01,0.1250e-01,0.1150e-01,0.1060e-01,0.9770e-02, &
479	0.9010e-02,0.7660e-02,0.6520e-02,0.5540e-02,0.3420e-02,0.2100e-02, &
480	0.1290e-02,0.7930e-03,0.5700e-03,0.5350e-03,0.4820e-03,0.4380e-03, &
481	0.4080e-03,0.3500e-03,0.3200e-03,0.2550e-03,0.2120e-03,0.2000e-03, &
482	0.1860e-03,0.1750e-03,0.1660e-03,0.1560e-03,0.1490e-03,0.1440e-03, &
483	0.1350e-03,0.1210e-03,0.1160e-03,0.1160e-03,0.1170e-03,0.1200e-03, &
484	0.1230e-03,0.1320e-03,0.1440e-03,0.1680e-03,0.1800e-03,0.1900e-03, &
485	0.2090e-03,0.2160e-03,0.2290e-03,0.2400e-03,0.2600e-03,0.2920e-03, &
486	0.6100e-03,0.1020e-02,0.1810e-02/
487	data(tabimt(i,4),i=1,nwlt)/ &
488	0.8300e-01,0.6900e-01,0.5700e-01,0.4450e-01,0.3550e-01,0.2910e-01, &
489	0.2440e-01,0.1970e-01,0.1670e-01,0.1400e-01,0.1235e-01,0.1080e-01, &
490	0.8900e-02,0.7340e-02,0.6400e-02,0.5600e-02,0.5000e-02,0.4520e-02, &
491	0.3680e-02,0.2990e-02,0.2490e-02,0.1550e-02,0.9610e-03,0.5950e-03, &
492	0.3690e-03,0.2670e-03,0.2510e-03,0.2290e-03,0.2110e-03,0.1960e-03, &
493	0.1730e-03,0.1550e-03,0.1310e-03,0.1130e-03,0.1060e-03,0.9900e-04, &
494	0.9300e-04,0.8730e-04,0.8300e-04,0.7870e-04,0.7500e-04,0.6830e-04, &
495	0.5600e-04,0.4960e-04,0.4550e-04,0.4210e-04,0.3910e-04,0.3760e-04, &
496	0.3400e-04,0.3100e-04,0.2640e-04,0.2510e-04,0.2430e-04,0.2390e-04, &
497	0.2370e-04,0.2380e-04,0.2400e-04,0.2460e-04,0.2660e-04,0.4450e-04, &
498	0.8700e-04,0.1320e-03/
499
500	pi = acos(-1.0)
501	n_r=0.0
502	n_i=0.0
503
504	! // convert frequency to wavelength (um)
505	alam=3E5/freq
506	if((alam < wlmin) .or. (alam > wlmax)) then
507	print *, 'm_ice: wavelength out of bounds'
508	stop
509	endif
510
511	! // convert temperature to K
512	tk = t + 273.16
513
514	if (alam < cutice) then
515
516	! // region from 0.045 microns to 167.0 microns - no temperature depend
517	do i=2,nwl
518	if(alam < wl(i)) continue
519	enddo
520	x1=log(wl(i-1))
521	x2=log(wl(i))
522	y1=tabre(i-1)
523	y2=tabre(i)
524	x=log(alam)
525	y=((x-x1)*(y2-y1)/(x2-x1))+y1
526	n_r=y
527	y1=log(abs(tabim(i-1)))
528	y2=log(abs(tabim(i)))
529	y=((x-x1)*(y2-y1)/(x2-x1))+y1
530	n_i=exp(y)
531
532	else
533
534	! // region from 167.0 microns to 8.6 meters - temperature dependence
535	if(tk > temref(1)) tk=temref(1)
536	if(tk < temref(4)) tk=temref(4)
537	do 11 i=2,4
538	if(tk.ge.temref(i)) go to 12
539	11 continue
540	12 lt1=i
541	lt2=i-1
542	do 13 i=2,nwlt
543	if(alam.le.wlt(i)) go to 14
544	13 continue
545	14 x1=log(wlt(i-1))
546	x2=log(wlt(i))
547	y1=tabret(i-1,lt1)
548	y2=tabret(i,lt1)
549	x=log(alam)
550	ylo=((x-x1)*(y2-y1)/(x2-x1))+y1
551	y1=tabret(i-1,lt2)
552	y2=tabret(i,lt2)
553	yhi=((x-x1)*(y2-y1)/(x2-x1))+y1
554	t1=temref(lt1)
555	t2=temref(lt2)
556	y=((tk-t1)*(yhi-ylo)/(t2-t1))+ylo
557	n_r=y
558	y1=log(abs(tabimt(i-1,lt1)))
559	y2=log(abs(tabimt(i,lt1)))
560	ylo=((x-x1)*(y2-y1)/(x2-x1))+y1
561	y1=log(abs(tabimt(i-1,lt2)))
562	y2=log(abs(tabimt(i,lt2)))
563	yhi=((x-x1)*(y2-y1)/(x2-x1))+y1
564	y=((tk-t1)*(yhi-ylo)/(t2-t1))+ylo
565	n_i=exp(y)
566
567	endif
568
569	end subroutine m_ice
570
571	! ----------------------------------------------------------------------------
572	! subroutine MIEINT
573	! ----------------------------------------------------------------------------
574	!
575	! General purpose Mie scattering routine for single particles
576	! Author: R Grainger 1990
577	! History:
578	! G Thomas, March 2005: Added calculation of Phase function and
579	! code to ensure correct calculation of backscatter coeficient
580	! Options/Extend_Source
581	!
582	Subroutine MieInt(Dx, SCm, Inp, Dqv, Dqxt, Dqsc, Dbsc, Dg, Xs1, Xs2, DPh, Error)
583
584	Integer * 2 Imaxx
585	Parameter (Imaxx = 12000)
586	Real * 4 RIMax ! largest real part of refractive index
587	Parameter (RIMax = 2.5)
588	Real * 4 IRIMax ! largest imaginary part of refractive index
589	Parameter (IRIMax = -2)
590	Integer * 2 Itermax
591	Parameter (Itermax = 12000 * 2.5)
592	! must be large enough to cope with the
593	! largest possible nmx = x * abs(scm) + 15
594	! or nmx = Dx + 4.05Dx*(1./3.) + 2.0
595	Integer * 2 Imaxnp
596	Parameter (Imaxnp = 10000) ! Change this as required
597	! INPUT
598	Real * 8 Dx
599	Complex * 16 SCm
600	Integer * 4 Inp
601	Real * 8 Dqv(Inp)
602	! OUTPUT
603	Complex * 16 Xs1(InP)
604	Complex * 16 Xs2(InP)
605	Real * 8 Dqxt
606	Real * 8 Dqsc
607	Real * 8 Dg
608	Real * 8 Dbsc
609	Real * 8 DPh(InP)
610	Integer * 4 Error
611	! LOCAL
612	Integer * 2 I
613	Integer * 2 NStop
614	Integer * 2 NmX
615	Integer * 4 N ! N*N > 32767 ie N > 181
616	Integer * 4 Inp2
617	Real * 8 Chi,Chi0,Chi1
618	Real * 8 APsi,APsi0,APsi1
619	Real * 8 Pi0(Imaxnp)
620	Real * 8 Pi1(Imaxnp)
621	Real * 8 Taun(Imaxnp)
622	Real * 8 Psi,Psi0,Psi1
623	Complex * 8 Ir
624	Complex * 16 Cm
625	Complex * 16 A,ANM1,APB
626	Complex * 16 B,BNM1,AMB
627	Complex * 16 D(Itermax)
628	Complex * 16 Sp(Imaxnp)
629	Complex * 16 Sm(Imaxnp)
630	Complex * 16 Xi,Xi0,Xi1
631	Complex * 16 Y
632	! ACCELERATOR VARIABLES
633	Integer * 2 Tnp1
634	Integer * 2 Tnm1
635	Real * 8 Dn
636	Real * 8 Rnx
637	Real * 8 S(Imaxnp)
638	Real * 8 T(Imaxnp)
639	Real * 8 Turbo
640	Real * 8 A2
641	Complex * 16 A1
642
643	If ((Dx.Gt.Imaxx) .Or. (InP.Gt.ImaxNP)) Then
644	Error = 1
645	Return
646	EndIf
647	Cm = SCm
648	Ir = 1 / Cm
649	Y = Dx * Cm
650	If (Dx.Lt.0.02) Then
651	NStop = 2
652	Else
653	If (Dx.Le.8.0) Then
654	NStop = Dx + 4.00Dx*(1./3.) + 2.0
655	Else
656	If (Dx.Lt. 4200.0) Then
657	NStop = Dx + 4.05Dx*(1./3.) + 2.0
658	Else
659	NStop = Dx + 4.00Dx*(1./3.) + 2.0
660	End If
661	End If
662	End If
663	NmX = Max(Real(NStop),Real(Abs(Y))) + 15.
664	If (Nmx .gt. Itermax) then
665	Error = 1
666	Return
667	End If
668	Inp2 = Inp+1
669	D(NmX) = Dcmplx(0,0)
670	Do N = Nmx-1,1,-1
671	A1 = (N+1) / Y
672	D(N) = A1 - 1/(A1+D(N+1))
673	End Do
674	Do I =1,Inp2
675	Sm(I) = Dcmplx(0,0)
676	Sp(I) = Dcmplx(0,0)
677	Pi0(I) = 0
678	Pi1(I) = 1
679	End Do
680	Psi0 = Cos(Dx)
681	Psi1 = Sin(Dx)
682	Chi0 =-Sin(Dx)
683	Chi1 = Cos(Dx)
684	APsi0 = Psi0
685	APsi1 = Psi1
686	Xi0 = Dcmplx(APsi0,Chi0)
687	Xi1 = Dcmplx(APsi1,Chi1)
688	Dg = 0
689	Dqsc = 0
690	Dqxt = 0
691	Tnp1 = 1
692	Do N = 1,Nstop
693	DN = N
694	Tnp1 = Tnp1 + 2
695	Tnm1 = Tnp1 - 2
696	A2 = Tnp1 / (DN*(DN+1D0))
697	Turbo = (DN+1D0) / DN
698	Rnx = DN/Dx
699	Psi = Dble(Tnm1)*Psi1/Dx - Psi0
700	APsi = Psi
701	Chi = Tnm1*Chi1/Dx - Chi0
702	Xi = Dcmplx(APsi,Chi)
703	A = ((D(N)Ir+Rnx)APsi-APsi1) / ((D(N)Ir+Rnx) Xi- Xi1)
704	B = ((D(N)Cm+Rnx)APsi-APsi1) / ((D(N)Cm+Rnx) Xi- Xi1)
705	Dqxt = Tnp1 * Dble(A + B) + Dqxt
706	Dqsc = Tnp1 * (AConjg(A) + BConjg(B)) + Dqsc
707	If (N.Gt.1) then
708	Dg = Dg + (dNdN - 1) Dble(ANM1Conjg(A) + BNM1 Conjg(B)) / dN + TNM1 * Dble(ANM1Conjg(BNM1)) / (dNdN - dN)
709	End If
710	Anm1 = A
711	Bnm1 = B
712	APB = A2 * (A + B)
713	AMB = A2 * (A - B)
714	Do I = 1,Inp2
715	If (I.GT.Inp) Then
716	S(I) = -Pi1(I)
717	Else
718	S(I) = Dqv(I) * Pi1(I)
719	End If
720	T(I) = S(I) - Pi0(I)
721	Taun(I) = N*T(I) - Pi0(I)
722	Sp(I) = APB * (Pi1(I) + Taun(I)) + Sp(I)
723	Sm(I) = AMB * (Pi1(I) - Taun(I)) + Sm(I)
724	Pi0(I) = Pi1(I)
725	Pi1(I) = S(I) + T(I)*Turbo
726	End Do
727	Psi0 = Psi1
728	Psi1 = Psi
729	Apsi1 = Psi1
730	Chi0 = Chi1
731	Chi1 = Chi
732	Xi1 = Dcmplx(APsi1,Chi1)
733	End Do
734	If (Dg .GT.0) Dg = 2 * Dg / Dqsc
735	Dqsc = 2 * Dqsc / Dx**2
736	Dqxt = 2 * Dqxt / Dx**2
737	Do I = 1,Inp
738	Xs1(I) = (Sp(I)+Sm(I)) / 2
739	Xs2(I) = (Sp(I)-Sm(I)) / 2
740	Dph(I) = 2 * Dble(Xs1(I)Conjg(Xs1(I)) + Xs2(I)Conjg(Xs2(I))) / (Dx*2 Dqsc)
741	End Do
742	Dbsc = 4 * Abs(( (Sp(Inp2)+Sm(Inp2))/2 )2) / Dx2
743	Error = 0
744	Return
745	End subroutine MieInt
746
747	end module optics_lib

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