DOI: 10.1002/2014GL060009
论文题名: Extreme upper level cyclonic vorticity events in relation to the Southern Hemisphere jet stream
作者: Harnik N.
刊名: Geophysical Research Letters
ISSN: 0094-10556
EISSN: 1944-10287
出版年: 2014
卷: 41, 期: 12 起始页码: 4373
结束页码: 4380
语种: 英语
Scopus关键词: Cyclonic vorticity
; Jet streams
; Southern Hemisphere
; cyclone
; eddy covariance
; jet stream
; seasonal variation
; Southern Hemisphere
; surface temperature
; temperature anomaly
; upper atmosphere
; vorticity
英文摘要: The mean seasonal variation in the frequency of occurrence of extreme upper level cyclonic vorticity events, and its relation to the jet stream, is examined in the Southern Hemisphere. During the austral summer to fall, extreme cyclonic vorticity occurs most frequently at the upper level jet stream core, while during the austral winter to spring, there is a main peak on the poleward flank of the subtropical jet and a secondary peak on the poleward flank of the eddy-driven jet. Composite analysis shows that the extremes in both seasons are associated with wave breaking and the formation of elongated vorticity tongues. In summer, extreme events occur when waves propagating on the eddy-driven jet break nonlinearly, while in winter, extreme events occur when waves on the eddy-driven jet interact with waves on the subtropical jet. In both seasons, these extreme upper level vorticity events are associated with significant positive precipitation anomalies and a pattern of alternating positive and negative surface temperature anomalies. © 2014. American Geophysical Union. All Rights Reserved. URL: https://www.scopus.com/inward/record.uri?eid=2-s2.0-84902718381&doi=10.1002%2f2014GL060009&partnerID=40&md5=f4ea1bf6553317ef318feed331b140a0
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/7820
Appears in Collections: 气候减缓与适应
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作者单位: Department of Geophysics and Planetary Sciences, Tel Aviv University, Tel Aviv, Israel
Recommended Citation:
Harnik N.. Extreme upper level cyclonic vorticity events in relation to the Southern Hemisphere jet stream[J]. Geophysical Research Letters,2014-01-01,41(12).