globalchange  > 影响、适应和脆弱性
DOI: 10.1002/2015MS000481
Scopus记录号: 2-s2.0-84945436677
论文题名:
Poleward migration of eddy-driven jets
作者: Chemke R; , Kaspi Y
刊名: Journal of Advances in Modeling Earth Systems
ISSN: 19422466
出版年: 2015
卷: 7, 期:3
起始页码: 1457
结束页码: 1471
语种: 英语
英文关键词: Meteorology ; Momentum ; Rotation ; Baroclinic zones ; Coriolis parameter ; Eddy momentum flux ; Linear relation ; Migration rates ; Multiple jets ; Rotation rate ; Upper troposphere ; Fighter aircraft ; baroclinic mode ; Coriolis force ; eddy ; extratropical environment ; general circulation model ; jet ; meridional circulation ; momentum transfer ; rotation ; subtropical region ; troposphere ; zonal wind
英文摘要: Poleward migration of eddy-driven jets is found to occur in the extratropics when the subtropical and eddy-driven jets are clearly separated, as achieved by simulations at high-rotation rates. The poleward migration of these eddy-driven baroclinic jets over time is consistent with variation of eddy momentum flux convergence and baroclinicity across the width of the jet. We demonstrate this using a high-resolution idealized GCM where we systematically examine the eddy-driven jets over a wide range of rotation rates (up to 16 times the rotation rate of Earth). At the flanks of the jets, the poleward migration is caused by a poleward bias in baroclinicity across the width of the jet, estimated through measures such as Eady growth rate and supercriticality. The poleward biased baroclinicity is due to the meridional variation of the Coriolis parameter, which causes a poleward bias of the eddy momentum flux convergence. At the core of the jets, the poleward biased eddy momentum flux convergence relative to the mean jet deflects over time the baroclinicity and the jets poleward. As the rotation rate is increased, and more (narrower) jets emerge the migration rate becomes smaller due to less eddy momentum flux convergence over the narrower baroclinic zones. We find a linear relation between the migration rate of the jets and the net eddy momentum flux convergence across the jets. This poleward migration might be related to the slow poleward propagation of temporal anomalies of zonal winds observed in the upper troposphere. © 2015. The Authors.
Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/75989
Appears in Collections:影响、适应和脆弱性
气候变化与战略

Files in This Item:

There are no files associated with this item.


作者单位: Department of Earth and Planetary Sciences, Weizmann Institute of Science, Rehovot, Israel

Recommended Citation:
Chemke R,, Kaspi Y. Poleward migration of eddy-driven jets[J]. Journal of Advances in Modeling Earth Systems,2015-01-01,7(3)
Service
Recommend this item
Sava as my favorate item
Show this item's statistics
Export Endnote File
Google Scholar
Similar articles in Google Scholar
[Chemke R]'s Articles
[, Kaspi Y]'s Articles
百度学术
Similar articles in Baidu Scholar
[Chemke R]'s Articles
[, Kaspi Y]'s Articles
CSDL cross search
Similar articles in CSDL Cross Search
[Chemke R]‘s Articles
[, Kaspi Y]‘s Articles
Related Copyright Policies
Null
收藏/分享
所有评论 (0)
暂无评论
 

Items in IR are protected by copyright, with all rights reserved, unless otherwise indicated.