Observations of Submesoscale Variability and Frontal Subduction within the Mesoscale Eddy Field of the Tasman Sea
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作者:
Archer, Matthew
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机构:
Univ New South Wales, Sch Math & Stat, Sydney, NSW, AustraliaUniv New South Wales, Sch Math & Stat, Sydney, NSW, Australia
Archer, Matthew
[1
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Schaeffer, Amandine
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Univ New South Wales, Sch Math & Stat, Sydney, NSW, AustraliaUniv New South Wales, Sch Math & Stat, Sydney, NSW, Australia
Schaeffer, Amandine
[1
]
Keating, Shane
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Univ New South Wales, Sch Math & Stat, Sydney, NSW, AustraliaUniv New South Wales, Sch Math & Stat, Sydney, NSW, Australia
Keating, Shane
[1
]
Roughan, Moninya
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Univ New South Wales, Sch Math & Stat, Sydney, NSW, AustraliaUniv New South Wales, Sch Math & Stat, Sydney, NSW, Australia
Roughan, Moninya
[1
]
Holmes, Ryan
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机构:
Univ New South Wales, Sch Math & Stat, Sydney, NSW, Australia
Univ New South Wales, Climate Change Res Ctr, Sydney, NSW, Australia
Univ New South Wales, Ctr Excellence Climate Extremes, Sydney, NSW, AustraliaUniv New South Wales, Sch Math & Stat, Sydney, NSW, Australia
Holmes, Ryan
[1
,2
,3
]
Siegelman, Lia
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CALTECH, Pasadena, CA 91125 USAUniv New South Wales, Sch Math & Stat, Sydney, NSW, Australia
Siegelman, Lia
[4
]
机构:
[1] Univ New South Wales, Sch Math & Stat, Sydney, NSW, Australia
[2] Univ New South Wales, Climate Change Res Ctr, Sydney, NSW, Australia
[3] Univ New South Wales, Ctr Excellence Climate Extremes, Sydney, NSW, Australia
Frontogenesis;
frontolysis;
Instability;
Upwelling;
downwelling;
Eddies;
Oceanic mixed layer;
In situ oceanic observations;
EAST AUSTRALIAN CURRENT;
POTENTIAL VORTICITY;
COHERENT VORTICES;
GRAVITY-WAVES;
OCEAN FRONTS;
PART I;
EDDIES;
INSTABILITY;
SEPARATION;
WATER;
D O I:
10.1175/JPO-D-19-0131.1
中图分类号:
P7 [海洋学];
学科分类号:
0707 ;
摘要:
Submesoscale lenses of water with anomalous hydrographic properties have previously been observed in the East Australian Current (EAC) system, embedded within the thermocline of mesoscale anticyclonic eddies. The waters within these lenses have high oxygen content and temperature-salinity properties that signify a surface origin. However, it is not known how these lenses form. This study presents field observations that provide insight into a possible generation mechanism via subduction at upper-ocean fronts. High-resolution hydrographic and velocity measurements of submesoscale activity were taken across a front between a mesoscale eddy dipole downstream of the EAC separation point. The front had O(1) Rossby number, strong vertical shear, and flow conducive to symmetric instability. Frontogenesis was measured in conjunction with subduction of an anticyclonic water parcel, indicative of intrathermocline eddy formation. Twenty-five years of satellite imagery reveals the existence of strong mesoscale strain coupled with strong temperature fronts in this region and indicates the conditions that led to frontal subduction observed here are a persistent feature. These processes impact the vertical export of tracers from the surface and dissipation of mesoscale kinetic energy, implicating their importance for understanding regional ocean circulation and biological productivity.
机构:
Chinese Acad Sci, South China Sea Inst Oceanol, State Key Lab Trop Oceanog, Guangzhou, Peoples R China
Southern Marine Sci & Engn Guangdong Lab Guangzho, Guangzhou, Peoples R ChinaChinese Acad Sci, South China Sea Inst Oceanol, State Key Lab Trop Oceanog, Guangzhou, Peoples R China
Wang, Qiang
Zeng, Lili
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机构:
Chinese Acad Sci, South China Sea Inst Oceanol, State Key Lab Trop Oceanog, Guangzhou, Peoples R ChinaChinese Acad Sci, South China Sea Inst Oceanol, State Key Lab Trop Oceanog, Guangzhou, Peoples R China
Zeng, Lili
Chen, Ju
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机构:
Chinese Acad Sci, South China Sea Inst Oceanol, State Key Lab Trop Oceanog, Guangzhou, Peoples R ChinaChinese Acad Sci, South China Sea Inst Oceanol, State Key Lab Trop Oceanog, Guangzhou, Peoples R China
Chen, Ju
He, Yunkai
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机构:
Chinese Acad Sci, South China Sea Inst Oceanol, State Key Lab Trop Oceanog, Guangzhou, Peoples R ChinaChinese Acad Sci, South China Sea Inst Oceanol, State Key Lab Trop Oceanog, Guangzhou, Peoples R China
He, Yunkai
Zhou, Weidong
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机构:
Chinese Acad Sci, South China Sea Inst Oceanol, State Key Lab Trop Oceanog, Guangzhou, Peoples R ChinaChinese Acad Sci, South China Sea Inst Oceanol, State Key Lab Trop Oceanog, Guangzhou, Peoples R China
Zhou, Weidong
Wang, Dongxiao
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机构:
Sun Yat Sen Univ, Sch Marine Sci, Guangzhou, Peoples R ChinaChinese Acad Sci, South China Sea Inst Oceanol, State Key Lab Trop Oceanog, Guangzhou, Peoples R China