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Short-Wave Solar Radiation in the Earth’s Atmosphere Part 9

Phụ thuộc của quang phổ tán xạ duy nhất đồng-suất phản chiếu 1 - ω0 lấy từ các dữ liệu quan trắc mặt đất: một ở Bắc Cực, năm 1979 và b ở ngoại ô St Petersburg (thành phố Petrodvorets) năm 1996. | 246 Analysis of Radiative Observations in Cloudy Atmosphere Fig.7.7a b. Spectral dependence of single scattering co-albedo 1 - 0 retrieved from the ground observation data a in Arctic 1979 and b in St. Petersburg suburb city Petrodvorets 1996 Wavelength gm ------- 13.08.79 . 08.10.79 Fig. 7.8. Spectral dependence of optical thickness T0 retrieved from the data of the ground observations in Arctic experiment 11-13 August 1979 and experiment 12 - 08 October 1979 7.3.2 Data Processing of Satellite Observations Optical thickness T0 and single scattering co-albedo 1- a 0 for extended clouds were obtained with inverse asymptotic formulas 6.13 6.28 . The approximate accounting of the horizontal inhomogeneity including the scattering of radiation by the upper atmospheric layers was accomplished with 6.36 and 6.39 . Multidirectional reflected radiance measurements with the POLDER Optical Parameters from Ground and Satellite Observations 247 instrument were processed for the retrieval of cloud optical parameters. The pixels with the cloud amount exceeding 0.5 were only considered. The following sequence of the procedures for every pixel is proposed for processing POLDER data 1. At the first step the angular dependent functions are calculated. 2. The next step includes the calculation of the approximate optical thickness for every viewing direction with the simple formula assuming the conservative scattering. The obtained values show the degree of the shadowing influence or the influence of the cloud top deviation from the plane and give the possibility to evaluate parameter r with 6.39 . Besides they allow choosing the pairs of viewing directions where the optical thickness is approximately equal. 3. Thethird stageconsistsofthe parameter s2 retrieval from the radiances at each pair of viewing directions with the equal optical thickness 6.13 . If the optical thickness defined at the previous stage without accounting of the absorption is more than 100 parameter s2 is obtained