Polar stratosphere dynamics during early sudden stratospheric warmings
A.A. Okulicheva, T.S. Ermakova
Russian State Hydrometeorological University, St. Petersburg, Russia
Keywords: sudden stratospheric warming, splitting of the polar vortex, displacement of the polar vortex, dynamics of the stratosphere
Abstract
The influence of early sudden stratospheric warming (SSW) on the stratospheric polar vortex is presented. The definition of SSW and their classifications have been formulated for a long time, but detailed information is not available about the early (in November - the first half of December) SSW. The determination of early SSW was carried out in two ways using the zonal averaged values of temperature and zonal wind component with and without the climatic component. The polar vortex's response to warming is represented by the geopotential height field. The study was conducted using JRA-55 and Merra2 reanalysis data. Also, the variation of surface temperature and surface pressure during the displacement and splitting of the stratospheric polar vortex during the early SSW is presented based on sounding data at stations of the polar region of different continents. It is known that the VSP has a significant impact on the weather in the troposphere, including the dynamics of the upper atmosphere.
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