globalchange  > 气候减缓与适应
DOI: 10.1002/2017JC013412
Scopus记录号: 2-s2.0-85042543540
论文题名:
The Role of the New Zealand Plateau in the Tasman Sea Circulation and Separation of the East Australian Current
作者: Bull C.Y.S.; Kiss A.E.; van Sebille E.; Jourdain N.C.; England M.H.
刊名: Journal of Geophysical Research: Oceans
ISSN: 21699275
出版年: 2018
卷: 123, 期:2
起始页码: 1457
结束页码: 1470
语种: 英语
英文关键词: EAC ; East Australian Current ; New Zealand ; Nucleus for European Modeling of Ocean (NEMO) ; numerical ocean modeling ; western boundary current separation
Scopus关键词: bathymetry ; boundary current ; eddy covariance ; meridional circulation ; numerical model ; oceanic circulation ; oceanic front ; prediction ; regional climate ; separation ; wind stress ; East Australian Current ; New Zealand ; Pacific Ocean ; Tasman Sea
英文摘要: The East Australian Current (EAC) plays a major role in regional climate, circulation, and ecosystems, but predicting future changes is hampered by limited understanding of the factors controlling EAC separation. While there has been speculation that the presence of New Zealand may be important for the EAC separation, the prevailing view is that the time-mean partial separation is set by the ocean's response to gradients in the wind stress curl. This study focuses on the role of New Zealand, and the associated adjacent bathymetry, in the partial separation of the EAC and ocean circulation in the Tasman Sea. Here utilizing an eddy-permitting ocean model (NEMO), we find that the complete removal of the New Zealand plateau leads to a smaller fraction of EAC transport heading east and more heading south, with the mean separation latitude shifting >100 km southward. To examine the underlying dynamics, we remove New Zealand with two linear models: the Sverdrup/Godfrey Island Rule and NEMO in linear mode. We find that linear processes and deep bathymetry play a major role in the mean Tasman Front position, whereas nonlinear processes are crucial for the extent of the EAC retroflection. Contrary to past work, we find that meridional gradients in the basin-wide wind stress curl are not the sole factor determining the latitude of EAC separation. We suggest that the Tasman Front location is set by either the maximum meridional gradient in the wind stress curl or the northern tip of New Zealand, whichever is furthest north. © 2018. American Geophysical Union. All Rights Reserved.
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/114504
Appears in Collections:气候减缓与适应

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作者单位: Climate Change Research Centre, University of New South Wales, Sydney, NSW, Australia; ARC Centre of Excellence for Climate System Science, University of New South Wales, Sydney, NSW, Australia; School of Physical, Environmental and Mathematical Sciences, University of New South Wales Canberra at the Australian Defence Force Academy, Canberra, ACT, Australia; Research School of Earth Sciences, Australian National University, Canberra, ACT, Australia; Grantham Institute and Department of Physics, Imperial College London, London, United Kingdom; Institute for Marine and Atmospheric Research Utrecht, Utrecht University, Utrecht, Netherlands; Univ. Grenoble Alpes, CNRS, IRD, IGE, Grenoble, France

Recommended Citation:
Bull C.Y.S.,Kiss A.E.,van Sebille E.,et al. The Role of the New Zealand Plateau in the Tasman Sea Circulation and Separation of the East Australian Current[J]. Journal of Geophysical Research: Oceans,2018-01-01,123(2)
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