ISSN 2070-7401 (Print), ISSN 2411-0280 (Online)
Sovremennye problemy distantsionnogo zondirovaniya Zemli iz kosmosa


Sovremennye problemy distantsionnogo zondirovaniya Zemli iz kosmosa, 2017, Vol. 14, No. 1, pp. 226-244

Simple radiative model of clear sky and cloudy atmosphere

A.S. Ginzburg 1 , I.N. Melnikova 2, 3 , S.S. Novikov 3 , V.A. Frolkis 4, 5 
1 A.M. Obukhov Institute of Atmospheric Physics RAS, Moscow, Russia
2 St. Petersburg State University, St. Petersburg, Russia
3 Russian State Hydrometeorological University, St. Petersburg, Russia
4 St. Petersburg State Transport University, St. Petersburg, Russia
5 A.I. Voeikov Main Geophysical Observatory, St. Petersburg, Russia
Accepted: 25.01.2017
DOI: 10.21046/2070-7401-2017-14-1-226-244
This article is the continuation of the study (Ginzburg et al., 2016). The results of calculating the hemispherical fluxes of the reflected and transmitted solar radiation by the atmosphere and of radiative divergence on the basis of simple optical models for cloudless and cloudy atmosphere are presented. The Delta-Eddington approach is used for the problem solution, which is applicable in a wide range of atmospheric optical parameters. The article discusses the spectral values of the extra-atmospheric radiation by several literary sources. The calculation was done for surface albedo values of 0, 0.5, 0.9 and for the spectral values of a sandy surface. 4 values of solar zenith angle: 0, 30, 40 and 60 degrees are considered. The obtained values are compared with the data of airborne observations of hemispherical solar flux. When comparing with experimental data values of the solar angle corresponding to experimental were used. It is shown that the use of simple optical models allows to obtain real values of the radiative characteristics, and the approach used for calculation provides sufficient accuracy of the result for many problems. Estimation of the local instantaneous radiative forcing of atmospheric aerosols and clouds for 3 models of the contents of the aerosol and cloud layer models considered in (Ginzburg et al., 2016) is accomplished along with the heating rate of the troposphere for the considered models. The following analysis is performed: dependence of radiative characteristics from the atmospheric optical thickness for 4 values of the solar zenith angles, the 2 values of the surface albedo 0 and 0.9 and 2-values of the single scattering albedo (SSA) 0,750 and 0,999. It is found out that these dependencies are significantly different for the considered models of the atmosphere. This in its turn clearly describes the influence of optical parameters of the atmosphere and surface at the transformation of the solar radiation field.
Keywords: solar radiation, hemispherical flux, radiative divergence, radiative forcing, surface albedo, optical thickness, single scattering albedo
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