National Taiwan Ocean University Institutional Repository:Item 987654321/51809
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题名: Vertical structure and surface patterns of Green Island wakes induced by the Kuroshio
作者: Po-Chun Hsu
Kai-Ho Cheng
Sen Jan
Hung-Jen Lee
Chung-Ru Ho
贡献者: 海洋環境資訊系
关键词: Island wake
Kuroshio
MODIS
Vertical mixing
Subsurface layer
日期: 2018-11
上传时间: 2018-12-25T02:54:54Z
出版者: Deep-Sea Research Part 1
摘要: Abstract: When the Kuroshio passes Green Island off Taiwan, well-organized wakes are formed by the interaction between the Kuroshio and the island. The vertical mixing in the wake produces cold water, which entrains from the mixed layer below the surface and results in relatively colder and saltier waters with a higher chlorophyll-a concentration on the sea surface to the lee of the island. The meander of the Kuroshio maximum velocity axis has a major influence on the island wake. The shift of the Kuroshio in front of Green Island not only weakens the flow velocity but also affects the development of the wake. In the Green Island wake, the density overturns with a Thorpe scale between 2.9 m and 20.5 m and the turbulent kinetic energy dissipation rate is 0.2 × 10−6–8.5 × 10−5 W kg−1, which corresponds to an eddy diffusivity in the range of 0.01–0.23 m2 s−1. The spatial distribution patterns of the sea surface temperature (SST) in the island wake are classified into four distinct types, as obtained from moderate-resolution imaging spectroradiometer (MODIS) SST images. The most frequently occurring type is of the wake alone, which accounts for 86.7% of the island wake patterns. The other three types are a wake with a tail stretching downstream (4.0%), a wake with a small cyclonic cold core but no tail stretching downstream (6.8%) and an S-shaped meandering wake (2.5%).
URI: http://ntour.ntou.edu.tw:8080/ir/handle/987654321/51809
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