The Major Sudden Stratospheric Warming Impact on Mid-Latitude Surface Weather

Yuke Wang,Dmitri Shulga,Gennadi Milinevsky,Valery Shulga,Oleksandr Evtushevsky,Asen Grytsai,Wei Han,Yuliia Yukhymchuk

doi:10.1051/epjconf/202023704007

Abstract

The possible relation of a major sudden stratospheric warming (SSW) with the mid-latitude surface weather conditions was investigated using data from the ERA-Interim and NCEP–NCAR reanalyzes. An important feature of the SSW event is the impact on lower altitudes, when temperature and wind anomalies descend downward into the high- and mid-latitude troposphere during the weeks or even month and influence the surface weather [1, 2]. Owing to known SSW impacts on the surface weather [2], we consider the possible relation of the SSW event in winter 2018 to cold weather anomaly in the Northern Ukraine and North-East China in February 2018.

Highlights

The event of major sudden stratospheric warming (SSW) which happened roughly each two years in the North Polar region is produced by strong planetary wave activity
In the paper we consider the possible relation of the SSW event in winter 2018 with cold weather anomaly in the Northern Ukraine and North-East China regions in February 2018
The negative regional anomaly in the tropospheric temperature is formed at the north of the Kharkiv latitude 50oN. It locates in middle troposphere and is vertically aligned with the southern edge of the strong positive stratospheric anomaly (> 10oC, thick black contour)

Summary

Introduction

The event of major sudden stratospheric warming (SSW) which happened roughly each two years in the North Polar region is produced by strong planetary wave activity. The SSW event can impact on lower altitudes and midlatitude troposphere changing the surface weather significantly. The SSW event in February 2018 shows enhanced warming in the stratosphere and cooling in the mesosphere. These processes trigger the chain of effects that propagate down in altitudes and moving from high to lower latitudes. In the paper we consider the possible relation of the SSW event in winter 2018 with cold weather anomaly in the Northern Ukraine and North-East China regions in February 2018

Methods

Results

Conclusion