Abstract—
In winter–spring of 2019–2020 and 2010–2011 the strongest ozone anomalies in the Arctic in the entire satellite era were observed. They were due to extraordinarily strong and long-lasting stratospheric polar vortices, entailing unprecedented chemical ozone destruction. The analysis of the TEMIS data indicates that the relative total ozone content (TOC) deviations from the multiyear (2003–2019 except 2011) average were 37–44% in 2011 and 45–55% in 2020 at Arctic sites; and 27–36% in 2011 and 27–32% in 2020 at subarctic latitudes. Based on Aura MLS data, the minimal temperatures over the Arctic were 8–12% below normal in 2011 and 8–13% below normal in 2020. The ozone concentration for Alert station dropped to 23% of the multiyear average at the altitude of 20 km on March 22, 2011, and to 6% at the altitude ~19 km on April 15, 2020. A detailed correlation analysis showed that deviations in concentrations of water vapor and ozone, water vapor and temperature, and ozone and temperature from multiyear averages correlate stronger in 2020 than 2011. The correlations decrease toward the vortex periphery owing to the exchange of air masses between the Arctic and middle latitudes, until becoming weakly significant outside the Arctic circle.
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ACKNOWLEDGMENTS
TOC measurements from Geophysical Observatory in the Institute of Monitoring of Climatic and Ecological Systems, Siberian Branch, Russian Academy of Sciences, used in this work to calculate the deviations of 2019/2020 and 2010/2011 TOCs from multiyear average, were kindly provided by S.V. Smirnov from the Laboratory of Physics of Climatic Systems.
Funding
This work was supported by the Ministry of Science and Higher Education of the Russian Federation (V.E. Zuev Institute of Atmospheric Optics, Siberian Branch, Russian Academy of Sciences). In our work, we used the instrumentations from the Center for collective use, Atmosphere, under the partial support from Ministry of Science and Higher Education of the Russian Federation (agreement no. 075-15-2021-661).
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Bazhenov, O.E. Ozone Anomalies in the Stratosphere of the Arctic and North Eurasia: Comparison of the 2011 and 2020 Events Using TEMIS and Aura MLS Data. Atmos Ocean Opt 35, 517–523 (2022). https://doi.org/10.1134/S1024856022050086
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DOI: https://doi.org/10.1134/S1024856022050086