Numerical Studies of Submesoscale Island Wakes in the Kuroshio

Chih‐Lun Liu; Ming‐Huei Chang

doi:10.1029/2017jc013501

Numerical Studies of Submesoscale Island Wakes in the Kuroshio

Journal of Geophysical Research Oceans ◽

10.1029/2017jc013501 ◽

2018 ◽

Vol 123 (8) ◽

pp. 5669-5687 ◽

Cited By ~ 8

Author(s):

Chih‐Lun Liu ◽

Ming‐Huei Chang

Keyword(s):

Numerical Studies ◽

Island Wakes ◽

The Kuroshio

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Numerical studies on the influence of the variations of the Kuroshio Path on the transport of fish eggs and larvae

GeoJournal ◽

10.1007/bf02626376 ◽

1988 ◽

Vol 16 (1) ◽

pp. 113-117 ◽

Cited By ~ 2

Author(s):

Takashige Sugimoto ◽

Masato Kobayashi

Keyword(s):

Fish Eggs ◽

Kuroshio Path ◽

Numerical Studies ◽

The Kuroshio ◽

Eggs And Larvae ◽

Fish Eggs And Larvae

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Vertical structure and surface patterns of Green Island wakes induced by the Kuroshio

Deep Sea Research Part I Oceanographic Research Papers ◽

10.1016/j.dsr.2018.11.002 ◽

2019 ◽

Vol 143 ◽

pp. 1-16 ◽

Cited By ~ 4

Author(s):

Po-Chun Hsu ◽

Kai-Ho Cheng ◽

Sen Jan ◽

Hung-Jen Lee ◽

Chung-Ru Ho

Keyword(s):

Vertical Structure ◽

Island Wakes ◽

Surface Patterns ◽

The Kuroshio ◽

Green Island

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Numerical studies of small island wakes in the ocean

Geophysical & Astrophysical Fluid Dynamics ◽

10.1080/03091929608208966 ◽

1996 ◽

Vol 83 (3-4) ◽

pp. 195-231 ◽

Cited By ~ 22

Author(s):

David E. Dietrich ◽

Malcolm J. Bowman ◽

Charles A. Lin ◽

Alberto Mestas-Nunez

Keyword(s):

Small Island ◽

Numerical Studies ◽

Island Wakes

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Observations of Island Wakes at High Rossby Numbers: Evolution of Submesoscale Vortices and Free Shear Layers

Journal of Physical Oceanography ◽

10.1175/jpo-d-19-0035.1 ◽

2019 ◽

Vol 49 (11) ◽

pp. 2997-3016 ◽

Cited By ~ 5

Author(s):

Ming-Huei Chang ◽

Sen Jan ◽

Chih-Lun Liu ◽

Yu-Hsin Cheng ◽

Vigan Mensah

Keyword(s):

Relative Vorticity ◽

Water Tank ◽

Free Shear Layer ◽

Near Wake ◽

Thermal Front ◽

Tidal Period ◽

Time Period ◽

Island Wakes ◽

The Kuroshio ◽

Green Island

AbstractOceanic vortex evolution on the lee side of Taiwan’s Green Island (~7 km in diameter), where the Kuroshio flows at a speed of 1–1.5 m s−1, is observationally examined and compared to theories and the preceding results of laboratory experiments. In the near wake, recirculation occurs with a relative vorticity of ζ ~ 20f (where f is the planetary vorticity) and subsequently sheds at a combination of periods resulting from the tidal oscillations and the intrinsic time scale of eddy evolution. The tidal oscillations are the predominant processes. Our analysis suggests that an island positioned in the Kuroshio with periodic and cross-stream tidal excursions is analogous to a cross-stream oscillating cylinder. Consequently, the shedding period of the vortex is synchronized to a tidal period occurring close to the intrinsic period. The free shear layer, which is characterized by an ~30f relative vorticity band (2 km wide) and a wavy thermal front, develops between the Kuroshio and recirculation. The frontal wave occurring over a time period of 0.5–2 h resembles Kelvin–Helmholtz instability corresponding to high Re values. For the far wake, repeated cross-wake surveys suggest that cyclonic and anticyclonic vortices are alternatively present at a period close to the period of M2 tides in agreement with near-wake measurements. Repeated along-wake surveys reveal a cyclonic eddy shedding downstream at a speed of 0.35 m s−1, 1/3 of the upstream current speed, from the near wake. In comparing our observations with the results of previous water tank experiments, an Re value of O(103) for the submesoscale wake regime is expected.

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