Calculation of solar radiation fluxes in the UV region with different cross sections of ozone and nitrogen dioxide absorption

The paper estimates the possible errors in the modeling of atmospheric transfer of UV solar radiation by means of using modern data on cross sections of ozone and nitrogen dioxide absorption. The estimated data on atmosphere transparence, as well as direct and diffuse scattered fluxes of solar radiation at the Earth’s surface, registered by ground-based instruments with different spectral resolution, are compared. We analyze the spectroscopic errors in recovering the total content of atmospheric ozone at the measurement of atmospheric transparency with the use of SPM solar photometers, designed in the Siberian Branch of RAS. The calculations of UV atmosphere absorption are based on the data of ozone cross sections by Bass, Daumont, Molina and Serdyuchenko, and nitrogen dioxide by Bogumil, Burrows and JPL. It is shown that at the high spectrum resolution 0,02-0,06 nm, difference in the atmospheric transmission of ozone, calculated with the use of data on cross section absorption of ozone (Serdyuchenko and Bass), reaches 18,4 % for summer meteorological conditions of Volgograd and 22,3 % for Tomsk in the spectral interval near 305 nm, which is often used in recovering the total content of atmospheric ozone. We also calculated the UV radiation fluxes, measured by the SPM solar photometer for typical atmospheric conditions of Volgograd and Tomsk. In this case, the spectral resolution is lower (about 10 nm), and the difference in the atmospheric transmission is less than 2 % due to ozone absorption cross section data. The use of Molina data produces the difference up to 1,8 % in the total downward solar fluxes relatively to the data of Bass that can lead to an error in ozone total content retrieval less than 4 %. The use of different NO2 absorption cross section data does not influence the atmospheric transmission calculation in the 250-400 nm spectral interval. The discrepancies in the transmission do not exceed 0,9 %.