Methodics for calculation of the atmospheric aerosol transmittance factor of solar radiation upon pyranometric measurements
The paper is devoted to the development of methodics for calculation of trancmittance factor of atmospheric aerosol upon carrying out wide band pyranometric measurements. It is noted that uncertainty of results of measurements of surface radiation is researched in detail less than uncertainty of results of measurements of exterrestrial radiation. The major reasson for uncertainty of assessments of the earth surface r4adiation is the non- accutracy of accounting of atmospheric factors. The known methodics for calculation of atmospheric transmittance factor of solar radiation are analyzed. It is noted that accounting in this methodics only the aerosol scattering of optical radiation is true if the opticasl thickness of aerosol is less than 0.2. For complete accounting of atmospheric aerosol effect the known graphics of dependence of ratio of one-fold scattering radiation to global scattered radiation on aerosol optical depth a cosinuse of zenith angle are utilized. Comparison of known methgodics and said graphics make it possibleer to carry out more pricize accounting of aerosol factor in calculation of aerosol transmittance of solar radiation.