气候变化领域集成服务门户(CCPortal): Feature-based jet variability in the upper troposphere

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DOI	10.1175/JCLI-D-19-0715.1
	Feature-based jet variability in the upper troposphere
	Spensberger C.; Spengler T.
发表日期	2020
ISSN	0894-8755
起始页码	6849
结束页码	6871
卷号	33 期号:16
英文摘要	Jets in the upper troposphere constitute a cornerstone of both synoptic meteorology and climate dynamics, providing a direct link between weather and midlatitude climate variability. Conventionally, jet variability is often inferred indirectly through the variability of geopotential or sea level pressure. As recent findings pointed to physical discrepancies of this interpretation for the Southern Hemisphere, this study presents a global overview of jet variability based on automated jet detections in the upper troposphere. Consistent with previous studies, most ocean basins are dominated by variability patterns comprising either a latitudinal shift of the jet or a so-called pulsing, a broadening/narrowing of the jet distribution without a change in the mean position. Whereas previous studies generally associate a mode of storm track variability with either shifting or pulsing, jet-based variability patterns frequently represent a transition from shifting to pulsing, or vice versa, across the respective ocean basin. In the Northern Hemisphere, jet variability is consistent with geopotential variability, confirming earlier analyses. In the Southern Hemisphere, however, the variability of geopotential and jets often indicates different modes of variability. Notable exceptions are the consistent dominant modes of jet and geopotential variability in the South Pacific and, to a lesser extent, the south Indian Ocean during winter, as well as the dominant modes in the South Atlantic and south Indian Ocean during summer. Finally, tropical variability is shown to modulate the jet distribution in the Northern Hemisphere, which is in line with previous results. The response in the Southern Hemispheric, however, is shown to be markedly different. © 2020 American Meteorological Society. For information regarding reuse of this content and general copyright information, consult the AMS Copyright Policy (www.ametsoc.org/PUBSReuseLicenses).
英文关键词	Meteorology; Sea level; Climate variability; Northern Hemispheres; Sea level pressure; South Indian Ocean; Southern Hemisphere; Synoptic meteorology; Upper troposphere; Variability patterns; Troposphere; climate variation; jet stream; midlatitude environment; Northern Hemisphere; Southern Hemisphere; storm track; synoptic meteorology; troposphere; Atlantic Ocean; Atlantic Ocean (South); Indian Ocean; Indian Ocean (South); Pacific Ocean; Pacific Ocean (South)
语种	英语
来源期刊	Journal of Climate
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/171172
作者单位	Geophysical Institute, University of Bergen, Bjerknes Centre for Climate Research, Bergen, Norway
推荐引用方式 GB/T 7714	Spensberger C.,Spengler T.. Feature-based jet variability in the upper troposphere[J],2020,33(16).
APA	Spensberger C.,&Spengler T..(2020).Feature-based jet variability in the upper troposphere.Journal of Climate,33(16).
MLA	Spensberger C.,et al."Feature-based jet variability in the upper troposphere".Journal of Climate 33.16(2020).