Analysis of Radiative Observations in Cloudy Atmosphere - Short-Wave Solar Radiation in the Earth's Atmosphere - page 241

Fig. 7.4a,b. Spectral values of the volume absorption coefficient of the cloud layers between
measurement levels retrieved from experiment 6 - ( a )and7-( b ); Digits at curves indicate
the layer's number: a 1 - layer 4.1-3.0 km;2-3.0-1.6km;3-1.6-0.6km;4-0.6-0.05km;
b 1 - layer 1.4-1.3 km,2-1.3-1.2km,3-1.2-1.1km,4-1.1-0.9km, 5 - 0.9-0.8 km
Comparison of the optical thickness, summarized over all layers, with the
optical thickness retrieved from the measurements at the top and bottom of
the same cloud layer (Kondratyev et al. 1998; Melnikova and Mikhailov 2001)
as per Sect. 7.1, indicates that the difference does not exceed the errors due to
the processing technique.
The spectral values of the volume scattering and absorption coefficients
between the measurement levels have been obtained from the values of s 2 and
τ , while taking into account the distance between the levels and the spectral
dependence of g parameter according to (Stephens 1979). Figures 7.3a,b and
7.4a,b illustrate the spectral dependence of the retrieved optical parameters
and Figs. 7.5a,b and 7.6a,b show their vertical dependence.
7.3
Optical Parameters of Stratus Cloudiness fromData
of Ground and Satellite Observations
Here the analytical method of processing the reflected radiancemeasurements,
elaborated in Sect. 6.1, is applied to the multi-angle ground observations of the
transmitted radiance and to the satellite observations of the reflected radiance
to obtain the cloud optical thickness and single scattering albedo. The obser-
vations have been described in Sect. 3.4 in Tables 3.3 and 3.4. The reflected
and transmitted radiance in units of the solar incident flux (reflection and
transmission functions) was measured in several viewing angles.