aariПроблемы Арктики и АнтарктикиArctic and Antarctic Research0555-26482618-6713Государственный научный центр Российской Федерации Арктический и антарктический научно-исследовательский институт10.30758/0555-2648-2022-68-2-133-141aari-442Research ArticleФИЗИКА АТМОСФЕРЫ И ГИДРОСФЕРЫATMOSPHERE AND HYDROSPHERE PHYSICSВзаимосвязь между площадью и скоростью ветра по границе антарктического полярного вихряRelationship between area and wind speed along the edge of the Antarctic polar vortexЗуевВ. В.ZuevV. V.

Томск

Vladimir V. Zuev

Tomsk

СавельеваЕ. С.SavelievaE. S.

Томск

Ekaterina S. Savelieva

Tomsk

esav.pv@gmail.comИнститут мониторинга климатических и экологических систем Сибирского отделения Российской академии наукРоссияInstitute of Monitoring of Climatic and Ecological Systems of the Siberian Branch of the Russian Academy of SciencesRussian Federation202203072022682133141Copyright © Зуев В.В., Савельева Е.С., 20222022Зуев В.В., Савельева Е.С.Zuev V.V., Savelieva E.S.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/442

Одним из условий формирования полярной озоновой аномалии является наличие динамического барьера по границе полярного вихря в зимне-весенний период, существующего при скорости ветра по границе вихря в нижней стратосфере не менее 20 м/с и площади вихря более 10 млн км2 . Целью данной работы является исследование взаимосвязи между площадью вихря и скоростью ветра по границе вихря на примере антарктического полярного вихря. В работе использовался метод оконтуривания вихрей на основе значений геопотенциала, определенных по максимальным значениям градиента температуры и скорости ветра. Показано, что взаимосвязь между площадью вихря и скоростью ветра по границе вихря прослеживается при значениях площади менее 25 млн км2 (положительная корреляция) и более 50 млн км2 (отрицательная корреляция).

 

The Antarctic polar vortex forms in autumn, intensifies in the winter-spring period and decays in late spring. Inside the vortex in the lower stratosphere, favorable conditions are created for the annual spring ozone depletion. One of the conditions for the formation of the Antarctic ozone hole is the presence of a dynamic barrier along the vortex edge in the winter-spring period, which contributes to a decrease in temperature inside the vortex (necessary for the existence of polar stratospheric clouds) and prevents the penetration of air masses into the vortex. The dynamic barrier exists when the wind speed along the vortex edge in the lower stratosphere is at least 20 m/s. When the vortex area decreases below 10 million km2 , the dynamic barrier usually weakens, preceded by the vortex breakdown. The purpose of this work is to consider the relationship between the vortex area and the wind speed along the vortex edge using the Antarctic polar vortex as an example. To analyze the dynamics of the Antarctic polar vortex, we used a method based on vortex delineation, which makes it possible to calculate the vortex area and wind speed along the vortex edge using geopotential values determined from the maximum values of temperature gradient and wind speed and, thus, characterizing the polar vortex edges. Seasonal variations in the vortex area are mainly determined by the time of the beginning, peak and end of the polar night. In turn, seasonal changes in wind speed along the edge of the Antarctic vortex are additionally determined by the influence of the temperature of the lower subtropical stratosphere. To eliminate the influence of the seasonal variation, polynomial trends were removed from the time series of the parameters considered. We have shown that the relationship between the vortex area and the wind speed along the vortex edge can be traced for area values of less than 25 million km2 and more than 50 million km2 . At small values of the vortex area (< 25 million km2), during its formation and destruction, a positive correlation appears between the vortex area and the wind speed along the vortex edge. At high values of the vortex area (> 50 million km2), a negative correlation can be traced between the parameters studied.

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