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Fig. 7.11a,b.
Cloud optical parameters versus pixel numbers:
a
- single scattering co-albedo
(1−
τ
0
(
solid line
)andshadowparameter
r
×
10
2
(
dashed line
)
for three wavelength channels 443 nm - black line; 670 nm - red line; 865 nm-blueline;1-
latitude 58.75
◦
N and longitude 23
◦
W-75
◦
; 2 - latitude 44.75
◦
N and longitude 24
◦
W-30
◦
E;
3 - latitude 8.75
◦
N and longitude 120
◦
E-140
◦
E
ω
0
), and
b
- optical thickness
7.4
General Analysis of Retrieved Parameters of Stratus Cloudiness
7.4.1
Single Scattering Albedo and Volume Absorption Coefficient
Molecular absorption bands are apparent in the figures illustrating the spectral
dependence of single scattering co-albedo (1 −
ω
0
)buttheyareexpressed
differently in different cloud layers. The molecular band at wavelength 0.42
µ
appears in experiments 1, 2 and 4. It can be identified as an absorption by
hematite (see Sect. 3.3, Fig. 3.14 and studies by Ivlev and Andreev 1986 and
Sokolic and Toon 1999) contained in flue sand escapes from the Kara-Kum
and Sahara deserts. One can see the weak bands of the aerosol absorption at
wavelengths around 0.5 and 0.8
µ
m in the curves obtained from the data of
experiments 3 and 4, accomplished above the sea surface. It could be attributed
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