A Stduy on the Vertical Structure and Surface Characteristics of Green Island Wake Induced by Kuroshio

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基本資料

Project title

Code/計畫編號

MOST106-2611-M019-015

Translated Name/計畫中文名

黑潮研究 (Ⅲ)：水團層疊交錯、內潮、不穩定波動之研究-子計畫：黑潮引起的綠島尾流垂直結構與表面特徵之研究

Project Coordinator/計畫主持人

Chung-Ru Ho

Funding Organization/主管機關

National Science and Technology Council

Department/Unit

Department of Marine Environmental Informatics

Website

https://www.grb.gov.tw/search/planDetail?id=12243707

Year

2017

Start date/計畫起

01-08-2017

Expected Completion/計畫迄

31-07-2018

Bugetid/研究經費

1598千元

ResearchField/研究領域

海洋科學

"黑潮為北太平洋的西側邊界流，為一股強、快的洋流，當黑潮流經綠島會使島嶼後方因不穩定而產生尾流，甚至形成渦街(vortex street)，這些現象都可從衛星遙測影像中清楚看到。渦流在綠島後方引起垂直混合作用，形成相對較冷、高鹽度及葉綠素濃度較高的海面環境。這種不穩定波動造成的混合過程，對黑潮的影響，還不是很清楚，值得深入研究。本計畫擬利用20 多年的衛星遙測影像及船測與水下滑翔機的現場實測資料，分析黑潮引起綠島尾流的垂直結構變化及海面溫度與葉綠素濃度的變動，藉此分析其表面特徵。所使用的衛星影像資料將包括水色影像、紅外輻射影像、合成孔徑雷達影像等。本研究擬以兩年時間探討並了解綠島島嶼尾流的幾個議題：(1)尾流的海面溫度降溫幅度、擴散面積及尾流類型；(2)尾流受短時間大氣迫使的影響；(3)尾流造成的葉綠素濃度變化；(4)尾流的垂直結構變化；(5)尾流的垂直混合強度與表面分布的關係。研究結果將可進一步了解綠島尾流對黑潮及附近水團混合作用的影響，以提供日後黑潮發電廠址選擇的參考。""Kuroshio is a western boundary current in the North Pacific. It is a strong, fast, and relative steady current. There could be an island wake even though a vortex street occurred in the lee of the island when Kuroshio passes by Green Island. This might be caused by the instability of the flow when it passes by the island. Because of the vertical mixing process, waters with colder, saltier, and higher chlorophyll concentration are observed on the sea surface of the wake area. This kind of vertical mixing is still not clearly understood. Therefore, more than 20-year satellite remote sensing data including high and middle spatial-resolution optical and radar images, as well as in-situ data including ship and glider measurements will be used to more understand the vertical mixing of the wake and its relationship to the surface pattern variations. The aims of this proposal are to investigate and to try answering the following issues within 2 years. They are 1) the sea surface temperature drop, extent, and type of the Green Island wake; 2) the influences of the island wake forced by winds; 3) the change of chlorophyll concentration of the island wake; 4) the vertical structure of the island wake; and 5) the relationship between the mixing intensity and the surface pattern distribution of the island wake."

DSpace CRIS

A Stduy on the Vertical Structure and Surface Characteristics of Green Island Wake Induced by Kuroshio

基本資料

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