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Comparison of stratospheric evolution during the major sudden stratospheric warming events in 2018 and 2019

Earth and Planetary Physics 2020年第5期4卷 493-503页

作者： Zheng Ma Yun Gong ShaoDong Zhang JiaHui Luo QiHou Zhou ChunMing Huang KaiMing Huang School of Electronic Information Wuhan UniversityWuhan 430072China State Key Laboratory of Space Weather Chinese Academy of SciencesBeijing 100190China Key Laboratory of Geospace Environment and Geodesy Ministry of EducationWuhan 430079China State Key Laboratory of Information Engineering in Surveying Mapping and Remote SensingWuhan UniversityWuhan 430079China Electrical and Computer Engineering Department Miami UniversityOxfordOhio 45056USA

Using Modern-Era Retrospective analysis for Research and Applications,Version 2(MERRA-2)data in the northern hemisphere at the 10 hPa level,we compared the stratospheric evolution of temperature and geopotential height during two major sudden stratosphere warming events(SSWs)that occurred in the Arctic winter of 2018 and *** the prewarming period,poleward temperature-enhanced regions were mainly located around 120°E with a displaced vortex and around 120°E and 60°W with splitting *** evolution of geopotential height indicated that these temperature-enhanced regions were both on the western side of high-latitude *** the postwarming period,the polar vortex turned from splitting to displacement in the 2018 SSW but from displacement to splitting in the 2019 *** transitions were observed over the Atlantic region,which may have been caused by anticyclones moving through the polar *** findings revealed that the evolution of the anticyclone is important during SSWs and is closely related to temperature-enhanced regions in the prewarming periods and to transitions of the polar vortices in postwarming periods.

关键词： sudden stratosphere warming transitions of the polar vortex anticyclone Atlantic region

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