Dynamics of solar UV-B and UV-A radiations in Tomsk during ozone anomaly in spring, 2011
G.A. Ivlev1, B.D. Belan1, V.M. Dorokhov2
1V.E. Zuev Institute of Atmospheric Optics of Siberian Branch, 1, Academician Zuev square, Tomsk, 634021, Russia
2Tsentralnaya Aerologicheskaya Observatoriya, 141700, Mosk. Obl., Dolgoprudnyiy g., ul. Pervomayskaya, 3
Keywords: atmosphere, ozone, spectrophotometer, UV–B radiation
Abstract
The paper presents the data of observations of solar UV-B and total radiation in Tomsk (56.5°N, 85.1°E) in 2003–2012. The total solar radiation was measured by Yanishevsky pyranometer M-115M. The UV-B radiation, using the UVB-1 pyranometer. The Brewer MKIV S/N 049 spectrophotometer was used for total ozone and spectral UV radiation observations. The measurements of solar UV-B radiation and total ozone during the emergence and development of the ozone negative anomaly in spring of 2011 are discussed. The results of the spectral measurements of UV-B, UV-A radiation and total ozone data obtained during the spring ozone anomaly in 2011 are compared with observations in the same period of 2010. The 2010 ozone and UV radiation data have been taken as the most similar to long-term averaged norm for comparison. In 2011, during the reported period, exceeded values of daily doses of UV-B radiation reached 40%, and 36% of erythemal radiation. It is shown that the main contribution to the change in the values of UV-B radiation was made by significant reduction in total ozone relative to long-term norms. It is also shown that for certain regions of the spectrum (290–325 nm), the influence of such factors as cloud cover and surface albedo could partially or fully compensate for the increase in UV radiation, caused a significant drop in total ozone.
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