Abstract
Using the data of long-term (1958–2012) actinometric and meteorological observations of the Meteorological Observatory of Lomonosov Moscow State University, the observed and computed long-wave fluxes and the factors defining their variability are estimated. Obtained are the normals and determined are the limits of variability of effective radiation. Analyzed are the peculiarities of atmospheric back radiation. Demonstrated is the trend towards the decrease (in absolute value) in effective radiation caused by the increase in the atmospheric back radiation flux (Ea). The trend towards the increase in the atmospheric back radiation is determined by the increase in the values of meteorological parameters: cloudiness, atmospheric moisture content, and temperature. The content of aerosol and carbon dioxide does not affect the long-term variations of Ea registered in Moscow. Derived empirical formulae can be recommended for estimating the atmospheric back radiation and effective radiation of the Earth surface using meteorological observations.
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