Study of the relationship between snow cover and ozone concentration in the surface air layer
B.D. Belan, D.E. Savkin, G.N. Tolmachev
V.E. Zuev Institute of Atmospheric Optics of Siberian Branch of the Russian Academy of Science, 1, Academician Zuev square, Tomsk, 634055, Russia
Keywords: атмосфера, весенний максимум, воздух, газы-прекурсоры, изменение концентрации, озон, снежный покров, температура, atmosphere, spring maximum, air, gases-precursors, concentration change, ozone, snow cover, temperature
Abstract
The relationship between snow cover and surface ozone concentration is studied on the basis of measurements near Tomsk in 1990-2017. Four types of the seasonal ozone variations are revealed: (1) concentration growth which ends with a spring maximum (53.9% of cases); (2) slow growth and a surge in the concentration after the snow cover melting (19.2%); (3) neutral behavior during the snow cover period and a sharp surge in the concentration after the snow cover melting (15.4%); and (4) neutral behavior without spring maximum (11.5%). Thus, at the end of the snow cover period, the spring maximum of ozone concentration is observed in 88.5% of cases. Differences in the seasonal variations in different years are explained by the temperature dependence of photochemical ozone generation in the atmosphere.
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