The Southern Hemisphere sudden stratospheric warming of September 2019

• 作者: Lin Wang Scott Osprey Xiaocen Shen
• 来源期刊: 科学通报（英文版）
• 年，卷（期）: 2020,（21）
• 所属期刊栏目: SHORT COMMUNICATIONS
• 页码范围: 1800-1802
• 页数: 3页
• 语种: 英文

摘要

Sudden stratospheric warmings (SSWs) are extreme cases of stratospheric polar vortex weakening [1].They are termed minor when a reversal of the stratospheric meridional temperature gradient in the subpolar region at 10 hPa and poleward of 60° occurs, or major when this is accompanied by a complete reversal of the stratospheric circumpolar westerly jet [2].Although SSWs occur in both hemispheres, major SSWs are usually observed in the Northern Hemisphere, with a frequency of approximately six per decade.In contrast, only one major SSW has been recorded in the Southern Hemisphere, which occurred in 2002 [3].