Influence of sulfur dioxide on stratospheric polar cloud formation and ozone destruction in the winter-spring stratosphere of the Arctic based on Aura MLS observations
O.E. Bazhenov
V.E. Zuev Institute of Atmospheric Optics of Siberian Branch of the Russian Academy of Science, Tomsk, Russia
Keywords: ozone, sudden stratospheric warming, polar night, sulfur dioxide, temperature, Aura MLS observations, mixing ratio profile
Abstract
The sulfur dioxide (SO2) plays a key role in the winter-spring stratosphere of the Arctic because the sulfur compounds SO2 and H2SO4 (together with nitric acid HNO3) are the primary construction materials going to form the polar stratospheric clouds (PSCs). This paper studies the maximal SO2 concentrations and total SO2 columns at four Arctic sites: Eureka (Canada), Ny-Ålesund (Norway), Thule (Greenland), and Resolute (Canada) based on data on the minimal temperature, maximal negative deviations of ozone concentration from multiyear average, maximal sulfur dioxide concentration in the Arctic stratosphere, and the total ozone and sulfur dioxide columns calculated from the corresponding altitude profiles. The temperature and ozone mixing ratio profiles are obtained from the Aura MLS observations for 2005-2022; the sulfur dioxide mixing ratio profiles are calculated from Aura MLS observations for 2010/11, 2019/20, 2020/21, and 2021/22. The results can be useful for studying of how SO2 affects the PSC formation and O3 destruction in the winter-spring stratosphere of the Arctic.
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