Arctic polar vortex dynamics during winters 2015/2016 and 2016/2017

Article Type:
Research/Original Article (دارای رتبه معتبر)
In this work, we considered the role of the dynamic barrier weakening in winter in polar ozone depletion from late winter to spring with the example of the Arctic polar vortex dynamics in 2015/2016 and 2016/2017 by the vortex delineation method using geopotential. The main characteristics (vortex area, wind speed along the vortex edge, temperature and ozone mass mixing ratio inside the vortex) were calculated using the ERA5 reanalysis data based on the fact that the Arctic polar vortex edge at the 50, 70 and 100 hPa levels is determined by the geopotential values 19.5´104, 17.5´104 and 15.4´104 m2/s2, respectively. The geopotential values characterizing the polar vortex edge were determined from the maximum temperature gradient and maximum wind speed on average for 1979–2021. The dynamic barrier of the polar vortex contributes to lowering the temperature inside the vortex in the lower stratosphere and prevents the propagation of air masses into the vortex, creating conditions for ozone depletion from late winter to spring with the appearance of solar radiation. The polar vortex is characterized by the presence of a dynamic barrier, when the wind speed along the entire edge of the vortex is more than 20, 18 and 16 m/s at the 50, 70 and 100 hPa levels, respectively. In the winter-spring 2015/2016, almost no weakening of the dynamic barrier was observed, which contributed to a temperature decrease inside the vortex, the formation of polar stratospheric clouds and the subsequent occurrence of heterogeneous and photochemical reactions of ozone destruction, while in the winter 2016/2017, a frequent weakening of the dynamic barrier was observed in the lower stratosphere at the 50, 70 and 100 hPa levels, accompanied by an increase in temperature and ozone content inside the vortex as a result of the penetration of warm, ozone-rich air masses into the vortex.
Iranian Journal of Geophysics, Volume:17 Issue: 6, Winter 2024
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