气候变化领域集成服务门户(CCPortal): Eddy-Driven Cross-Shelf Transport in the East Australian Current Separation Zone

CCPortal

DOI	10.1029/2019JC015613
	Eddy-Driven Cross-Shelf Transport in the East Australian Current Separation Zone
	Malan N.; Archer M.; Roughan M.; Cetina-Heredia P.; Hemming M.; Rocha C.; Schaeffer A.; Suthers I.; Queiroz E.
发表日期	2020
ISSN	21699275
卷号	125 期号:2
英文摘要	In western boundary current systems, sharp velocity gradients between the poleward flowing jet and coastal waters generally act to inhibit cross-shelf exchange. Downstream of jet separation, dynamic mesoscale eddies dominate the flow. In the East Australian Current System, counter-rotating eddy dipoles are often present which, in the appropriate configuration, have potential to drive cross-shelf transport. However, this eddy dipole mode is poorly understood in the framework of cross-shelf exchange and the effect of these structures on shelf waters is uncertain. Using 25 years of satellite altimetry, as well as in situ sampling of a typical dipole event, we investigate the characteristics of eddy-driven cross-shelf exchange. We show that the maximum onshore velocity is driven by an eddy dipole structure and occurs in a defined latitudinal band between 33°S and 34°S more than 50% of the time. We sample a typical eddy dipole and find a strong onshore jet, 37 km wide, with velocities up to 1.78 m s (Formula presented.) and a transport of at least 16 Sv. Hydrographic data from an autonomous underwater glider show that this jet manifests on the shelf as a subsurface intrusion of warm salty water extending from offshore up onto the midshelf. In the light of climatic changes in western boundary current transport and the increase in their eddy kinetic energy, understanding eddy-driven cross-shelf exchange is important to predict future changes to the shelf water mass. ©2020. American Geophysical Union. All Rights Reserved.
英文关键词	cross-shelf exchange; eddy dynamics; western boundary current
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/186981
作者单位	School of Mathematics and Statistics, University of New South Wales, Sydney, NSW, Australia; Centre for Marine Science and Innovation, University of New South Wales, Sydney, NSW, Australia; Sydney Institute of Marine Science, Mosman, NSW, Australia; School of Biological Earth and Environmental Sciences, University of New South Wales, Sydney, NSW, Australia
推荐引用方式 GB/T 7714	Malan N.,Archer M.,Roughan M.,et al. Eddy-Driven Cross-Shelf Transport in the East Australian Current Separation Zone[J],2020,125(2).
APA	Malan N..,Archer M..,Roughan M..,Cetina-Heredia P..,Hemming M..,...&Queiroz E..(2020).Eddy-Driven Cross-Shelf Transport in the East Australian Current Separation Zone.Journal of Geophysical Research: Oceans,125(2).
MLA	Malan N.,et al."Eddy-Driven Cross-Shelf Transport in the East Australian Current Separation Zone".Journal of Geophysical Research: Oceans 125.2(2020).