气候变化领域集成服务门户(CCPortal): Dynamical evolution of a minor sudden stratospheric warming in the Southern Hemisphere in 2019

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DOI	10.5194/acp-22-3493-2022
	Dynamical evolution of a minor sudden stratospheric warming in the Southern Hemisphere in 2019
	Liu, Guangyu; Hirooka, Toshihiko; Eguchi, Nawo; Kruger, Kirstin
发表日期	2022
ISSN	1680-7316
EISSN	1680-7324
起始页码	3493
结束页码	3505
卷号	22 期号:5 页码:13
英文摘要	A major strong sudden stratospheric warming (SSW) occurred in the Southern Hemisphere (SH) stratosphere in 2002 (hereafter referred to as SSW2002), which is one of the most unusual winters in the SH. Following several warmings, the polar vortex broke down in midwinter. Eastward-traveling waves and their interaction with quasi-stationary planetary waves played an important role during this event. This study analyzed the Japanese 55-year reanalysis (JRA-55) dataset to examine the SSW event that occurred in the SH in 2019 (hereafter referred to as SSW2019). In 2019, a rapid temperature increase and decelerated westerly winds were observed at the polar cap, but since there was no reversal of westerly winds to easterly winds at 60 degrees S in the middle to lower stratosphere, the SSW2019 was classified as a minor warming event. The results showed that quasi-stationary planetary waves of zonal wavenumber 1 developed during the SSW2019. The strong vertical component of the Eliassen-Palm flux with zonal wavenumber 1 is indicative of pronounced propagation of planetary waves to the stratosphere. The wave driving in September 2019 was larger than that of the major SSW event in 2002. Major SSWs tend to accompany preceding minor warmings, preconditioning, which changes the zonal flow that weaken the polar night jet as seen in SSW2002. A similar preconditioning was hardly observed in SSW2019. The strong wave driving in SSW2019 occurred in high latitudes. Waveguides (i.e., positive values of the refractive index squared) were found at high latitudes in the upper stratosphere during the warming period, which provided favorable conditions for quasi-stationary planetary waves to propagate upward and poleward.
学科领域	Environmental Sciences; Meteorology & Atmospheric Sciences
语种	英语
WOS研究方向	Environmental Sciences & Ecology ; Meteorology & Atmospheric Sciences
WOS记录号	WOS:000772538200001
来源期刊	ATMOSPHERIC CHEMISTRY AND PHYSICS
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/273589
作者单位	Kyushu University; Kyushu University; University of Oslo
推荐引用方式 GB/T 7714	Liu, Guangyu,Hirooka, Toshihiko,Eguchi, Nawo,et al. Dynamical evolution of a minor sudden stratospheric warming in the Southern Hemisphere in 2019[J],2022,22(5):13.
APA	Liu, Guangyu,Hirooka, Toshihiko,Eguchi, Nawo,&Kruger, Kirstin.(2022).Dynamical evolution of a minor sudden stratospheric warming in the Southern Hemisphere in 2019.ATMOSPHERIC CHEMISTRY AND PHYSICS,22(5),13.
MLA	Liu, Guangyu,et al."Dynamical evolution of a minor sudden stratospheric warming in the Southern Hemisphere in 2019".ATMOSPHERIC CHEMISTRY AND PHYSICS 22.5(2022):13.