Sources, fate, and pathways of Leeuwin Current water in the Indian Ocean and Great Australian Bight: A Lagrangian study in an eddy-resolving ocean model
被引:17
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作者:
Sen Bull, Christopher Yit
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Univ New S Wales, ARC Ctr Excellence Climate Syst Sci, Sydney, NSW, Australia
Univ New S Wales, Climate Change Res Ctr, Sydney, NSW, AustraliaUniv New S Wales, ARC Ctr Excellence Climate Syst Sci, Sydney, NSW, Australia
Sen Bull, Christopher Yit
[1
,2
]
van Sebille, Erik
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Univ New S Wales, ARC Ctr Excellence Climate Syst Sci, Sydney, NSW, Australia
Univ New S Wales, Climate Change Res Ctr, Sydney, NSW, Australia
Univ London Imperial Coll Sci Technol & Med, Dept Phys, Grantham Inst, London, EnglandUniv New S Wales, ARC Ctr Excellence Climate Syst Sci, Sydney, NSW, Australia
van Sebille, Erik
[1
,2
,3
]
机构:
[1] Univ New S Wales, ARC Ctr Excellence Climate Syst Sci, Sydney, NSW, Australia
[2] Univ New S Wales, Climate Change Res Ctr, Sydney, NSW, Australia
[3] Univ London Imperial Coll Sci Technol & Med, Dept Phys, Grantham Inst, London, England
The Leeuwin Current is the dominant circulation feature in the eastern Indian Ocean, transporting tropical and subtropical water southward. While it is known that the Leeuwin Current draws its water from a multitude of sources, existing Indian Ocean circulation schematics have never quantified the fluxes of tropical and subtropical source water flowing into the Leeuwin Current. This paper uses virtual Lagrangian particles to quantify the transport of these sources along the Leeuwin Current's mean pathway. Here the pathways and exchange of Leeuwin Current source waters across six coastally bound sectors on the south-west Australian coast are analyzed. This constitutes the first quantitative assessment of Leeuwin Current pathways within an offline, 50 year integration time, eddy-resolving global ocean model simulation. Along the Leeuwin Current's pathway, we find a mean poleward transport of 3.7 Sv in which the tropical sources account for 60-78% of the transport. While the net transport is small, we see large transports flowing in and out of all the offshore boundaries of the Leeuwin Current sectors. Along the Leeuwin Current's pathway, we find that water from the Indonesian Throughflow contributes 50-66% of the seasonal signal. By applying conditions on the routes particles take entering the Leeuwin Current, we find particles are more likely to travel offshore north of 30 degrees S, while south of 30 degrees S, particles are more likely to continue downstream. We find a 0.2 Sv pathway of water from the Leeuwin Current's source regions, flowing through the entire Leeuwin Current pathway into the Great Australian Bight.
机构:
State Ocean Adm, Polar Res Inst China, Shanghai 200136, Peoples R ChinaState Ocean Adm, Polar Res Inst China, Shanghai 200136, Peoples R China
Li Qun
Zhang Zhanhai
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State Ocean Adm, Polar Res Inst China, Shanghai 200136, Peoples R ChinaState Ocean Adm, Polar Res Inst China, Shanghai 200136, Peoples R China
Zhang Zhanhai
Wu Huiding
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机构:
State Ocean Adm, Polar Res Inst China, Shanghai 200136, Peoples R China
State Ocean Adm, Natl Marine Environm Forecasting Ctr, Beijing 100081, Peoples R ChinaState Ocean Adm, Polar Res Inst China, Shanghai 200136, Peoples R China
机构:
Polar Research Institute of China,State Oceanic AdministrationPolar Research Institute of China,State Oceanic Administration
LI Qun
ZHANG Zhanhai
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机构:
Polar Research Institute of China,State Oceanic AdministrationPolar Research Institute of China,State Oceanic Administration
ZHANG Zhanhai
WU Huiding
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机构:
Polar Research Institute of China,State Oceanic Administration
National Marine Environmental Forecasting Center,State Oceanic AdministrationPolar Research Institute of China,State Oceanic Administration