aariПроблемы Арктики и АнтарктикиArctic and Antarctic Research0555-26482618-6713Государственный научный центр Российской Федерации Арктический и антарктический научно-исследовательский институт10.30758/0555-2648-2023-69-4-452-463aari-574Research ArticleФИЗИКА АТМОСФЕРЫ И ГИДРОСФЕРЫATMOSPHERE AND HYDROSPHERE PHYSICSAntarctic polar vortex dynamics in 2019 and 2020 under the influence of the subtropical stratosphereAntarctic polar vortex dynamics in 2019 and 2020 under the influence of the subtropical stratospherehttps://orcid.org/0000-0002-2351-8924ZuevV. V.ZuevV. V.

Tomsk

 

Tomsk

https://orcid.org/0000-0002-6560-7386SavelievaE. S.SavelievaE. S.

Tomsk

Moscow

 

Tomsk

Moscow

sav@imces.ruKrupchatnikovV. N.KrupchatnikovV. N.

Moscow

Novosibirsk

Moscow

Novosibirsk

BorovkoI. V.BorovkoI. V.

Novosibirsk

 

Novosibirsk

PavlinskyA. V.PavlinskyA. V.

Tomsk

Tomsk

ChkhetianiO. G.ChkhetianiO. G.

Moscow

Moscow

MaslennikovaE. A.MaslennikovaE. A.

Tomsk

Moscow

Tomsk

Moscow

Institute of Monitoring of Climatic and Ecological Systems of the Siberian Branch of the Russian Academy of SciencesРоссияInstitute of Monitoring of Climatic and Ecological Systems of the Siberian Branch of the Russian Academy of SciencesRussian FederationInstitute of Monitoring of Climatic and Ecological Systems of the Siberian Branch of the Russian Academy of Sciences; A.M. Obukhov Institute of Atmospheric Physics of the Russian Academy of SciencesРоссияInstitute of Monitoring of Climatic and Ecological Systems of the Siberian Branch of the Russian Academy of Sciences; A.M. Obukhov Institute of Atmospheric Physics of the Russian Academy of SciencesRussian FederationA.M. Obukhov Institute of Atmospheric Physics of the Russian Academy of Sciences; Institute of Computational Mathematics and Mathematical Geophysics of the Siberian Branch of the Russian Academy of Sciences; Siberian Regional Hydrometeorological Research Institute; ovosibirsk State UniversityРоссияA.M. Obukhov Institute of Atmospheric Physics of the Russian Academy of Sciences; Institute of Computational Mathematics and Mathematical Geophysics of the Siberian Branch of the Russian Academy of Sciences; Siberian Regional Hydrometeorological Research Institute; ovosibirsk State UniversityRussian FederationInstitute of Computational Mathematics and Mathematical Geophysics of the Siberian Branch of the Russian Academy of Sciences; Siberian State Transport UniversityРоссияInstitute of Computational Mathematics and Mathematical Geophysics of the Siberian Branch of the Russian Academy of Sciences; Siberian State Transport UniversityRussian FederationA.M. Obukhov Institute of Atmospheric Physics of the Russian Academy of SciencesРоссияA.M. Obukhov Institute of Atmospheric Physics of the Russian Academy of SciencesRussian Federation202309122023694452463Copyright © Zuev V.V., Savelieva E.S., Krupchatnikov V.N., Borovko I.V., Pavlinsky A.V., Chkhetiani O.G., Maslennikova E.A., 20232023Zuev V.V., Savelieva E.S., Krupchatnikov V.N., Borovko I.V., Pavlinsky A.V., Chkhetiani O.G., Maslennikova E.A.Zuev V.V., Savelieva E.S., Krupchatnikov V.N., Borovko I.V., Pavlinsky A.V., Chkhetiani O.G., Maslennikova E.A.Данная работа распространяется под лицензией Creative Commons Attribution 4.0.This work is licensed under a Creative Commons Attribution 4.0 License.https://www.aaresearch.science/jour/article/view/574

The trend of strengthening of the Antarctic polar vortex in late spring and early summer (November–December) has been observed in recent decades. A good example of this trend is the dynamics of the Antarctic polar vortex in 2020 when it existed until the last week of December. In 2019, conversely, on the contrary, an unusually early breakup of the polar vortex occurred, a minor sudden stratospheric warming was recorded. Strengthening (or weakening) of the Antarctic polar vortex occurs as a result of an increase (or decrease) in the stratospheric meridional temperature gradient under conditions of growth (or decline) in the temperature of the lower subtropical stratosphere. We considered the temperature variations in the lower subtropical stratosphere in the spring of 2019 and 2020 and the corresponding response of the Antarctic polar vortex. The dynamics of the Antarctic polar vortex in September–October 2019 and November 2020 was largely synchronized with the temperature changes in the lower subtropical stratosphere relative to climatological means. Using correlation analysis, we show that the Antarctic polar vortex dynamics in December is largely due to the temperature changes in the lower subtropical stratosphere that occurred in the second half of November, which manifested itself in 2020.

The trend of strengthening of the Antarctic polar vortex in late spring and early summer (November–December) has been observed in recent decades. A good example of this trend is the dynamics of the Antarctic polar vortex in 2020 when it existed until the last week of December. In 2019, conversely, on the contrary, an unusually early breakup of the polar vortex occurred, a minor sudden stratospheric warming was recorded. Strengthening (or weakening) of the Antarctic polar vortex occurs as a result of an increase (or decrease) in the stratospheric meridional temperature gradient under conditions of growth (or decline) in the temperature of the lower subtropical stratosphere. We considered the temperature variations in the lower subtropical stratosphere in the spring of 2019 and 2020 and the corresponding response of the Antarctic polar vortex. The dynamics of the Antarctic polar vortex in September–October 2019 and November 2020 was largely synchronized with the temperature changes in the lower subtropical stratosphere relative to climatological means. Using correlation analysis, we show that the Antarctic polar vortex dynamics in December is largely due to the temperature changes in the lower subtropical stratosphere that occurred in the second half of November, which manifested itself in 2020.

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The authors declare that there are no conflicts of interest present.