Interannual and seasonal variations in the atmospheric aerosol optical depth near Tomsk (1995-2018)
D.M. Kabanov, S.M. Sakerin, Yu.S. Turchinovich
V.E. Zuev Institute of Atmospheric Optics of Siberian Branch of the Russian Academy of Science, Tomsk, Russia
Keywords: аэрозольная оптическая толща, годовой ход, тренды, Сибирь, aerosol optical depth, annual behavior, trends, Siberia
Abstract
Seasonal and interannual variations in the atmospheric aerosol optical depth (AOD) are analyzed using multiyear (1995-2018) observations near Tomsk. The annual behavior of AOD is characterized by a minimum in November and maxima in early May and in July. Compared to the previous period (1995-2008), the annual behavior has been transformed so that the July maximum started to dominate. In the interannual variations we noted a significant negative trend of coarse-mode component and total AOD. The annually average AOD (0.5 mm) is 0.155 (0.126 without accounting for smokes) and the Ångström exponent is 1.32 for 2002-2018.
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