Sovremennye problemy distantsionnogo zondirovaniya Zemli iz kosmosa, 2017, Vol. 14, No. 5, pp. 285-299
Influence of atmospheric optical parameters on the characteristics of solar radiation
A.V. Vasilyev
1 , I.N. Melnikova
1, 2 , S.S. Novikov
1 1 St. Petersburg State University, St. Petersburg, Russia
2 Russian State Hydrometeorological University, St. Petersburg, Russia
Accepted: 29.08.2017
DOI: 10.21046/2070-7401-2017-14-5-285-299
The work investigates the dependencies of solar radiation characteristics on optical models of the Earth’s atmosphere. The article presents results for the reflected and transmitted hemispherical fluxes, radiative divergence, proportion of the scattered radiation in the transmitted flux, the contribution of different scattering orders in cloudless and cloudy atmospheres. Different values of atmospheric optical parameters, surface albedos and lighting geometries are considered. Computer codes, used for models of a homogeneous atmosphere, implement four methods of transfer theory: single scattering approximation, Eddington method, Monte Carlo method and method of asymptotic formulas. Values of the parameters, for which the dependence of radiative divergence from solar zenith angle and reflected flux on optical thickness is minimal weak, and described by a linear function, are identified. The proposed simple linear approximations of the flux dependence from atmospheric parameters and solar zenith angle allow fast and easy estimation of radiation characteristics when solving inverse problems of remote sensing, namely, retrieving atmospheric and surface optical parameters from satellite observations, or integrating radiative characteristics over solar zenith angle, or in technical applications, for example, when choosing the type of solar cell batteries for houses.
Keywords: solar radiation, hemispherical flux, radiative divergence, surface albedo, optical thickness, probability of quantum survival, surface albedo
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