气候变化领域集成服务门户(CCPortal): A Persistent Deep Anticyclonic Vortex in the Rockall Trough Sustained by Anticyclonic Vortices Shed From the Slope Current and Wintertime Convection

CCPortal

DOI	10.1029/2019JC015905
	A Persistent Deep Anticyclonic Vortex in the Rockall Trough Sustained by Anticyclonic Vortices Shed From the Slope Current and Wintertime Convection
	Smilenova A.; Gula J.; Le Corre M.; Houpert L.; Reecht Y.
发表日期	2020
ISSN	21699275
卷号	125 期号:10
英文摘要	The presence of a persistent surface anticyclone centered at approximately 55°N, 12°W in the Rockall Trough, northeast North Atlantic, has been previously noted in satellite altimetry data. Here, we show that this surface anticyclone is the imprint of a deep, persistent, non-stationary anticyclonic vortex. Using wintertime 2007 and 2011 ship-board data, we describe the anticyclone's vertical structure for the first time and find that the anticyclone core is partly made of warm and salty Mediterranean Overflow Water. The anticyclone has a radius of ~40 km, it stretches down to 2,000 m, with a velocity maximum around 500 m. To analyze the anticyclone's generating mechanism, we use a mesoscale-resolving (~2 km) simulation, which produces a realistic pattern of the Rockall Trough anticyclone. The simulation indicates that the anticyclone is locally formed and sustained by two types of processes: wintertime convection and merger with anticyclonic vortices shed from the slope current flowing poleward along the eastern Rockall Trough slope. Intense negative vorticity filaments are generated along the Rockall Trough south-eastern slope, and they encapsulate Mediterranean Overflow Water as they detach and grow into anticyclonic vortices. These Mediterranean Overflow Water-rich vortices are advected into the trough, consequently merging with the Rockall Trough anticyclone and sustaining it. We suggest that the Rockall Trough anticyclone impacts regional intermediate water masses modifications, heat and salt budgets locally, and further afield into the neighboring subpolar northeast North Atlantic. ©2020. The Authors.
英文关键词	eddy merger; instability; mesoscale eddy; potential vorticity transformations; Rockall Trough; topographic effects; water masses mixing
语种	英语
来源期刊	Journal of Geophysical Research: Oceans
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/186648
作者单位	Earth and Ocean Sciences, School of Natural Sciences, National University of Ireland, Galway (NUIG), University Road, Galway, Ireland; Oceanographic Services, Marine Institute, Galway, Ireland; University of Brest, CNRS, IRD, Ifremer, Laboratoire d'Océanographie Physique et Spatiale (LOPS), IUEM, Brest, France; National Oceanography Centre (NOC), Southampton, United Kingdom; Institute of Marine Research, Bergen, Norway
推荐引用方式 GB/T 7714	Smilenova A.,Gula J.,Le Corre M.,et al. A Persistent Deep Anticyclonic Vortex in the Rockall Trough Sustained by Anticyclonic Vortices Shed From the Slope Current and Wintertime Convection[J],2020,125(10).
APA	Smilenova A.,Gula J.,Le Corre M.,Houpert L.,&Reecht Y..(2020).A Persistent Deep Anticyclonic Vortex in the Rockall Trough Sustained by Anticyclonic Vortices Shed From the Slope Current and Wintertime Convection.Journal of Geophysical Research: Oceans,125(10).
MLA	Smilenova A.,et al."A Persistent Deep Anticyclonic Vortex in the Rockall Trough Sustained by Anticyclonic Vortices Shed From the Slope Current and Wintertime Convection".Journal of Geophysical Research: Oceans 125.10(2020).