Observations and Analyses of Green Island Wake from Satellite Imagery-1

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Project title

Code/計畫編號

MOST104-2221-E019-033

Translated Name/計畫中文名

綠島尾流之衛星影像觀測分析-1

Project Coordinator/計畫主持人

Shih-Jen Huang

Funding Organization/主管機關

National Science and Technology Council

Co-Investigator(s)/共同執行人

何宗儒

Department/Unit

Department of Marine Environmental Informatics

Website

https://www.grb.gov.tw/search/planDetail?id=11585786

Year

2015

Start date/計畫起

01-08-2015

Expected Completion/計畫迄

31-07-2016

Co-Investigator(s)

Chung-Ru Ho

Bugetid/研究經費

691千元

ResearchField/研究領域

海洋科學
太空科技

本研究使用多種衛星影像觀測資，統計料分析台灣東部綠島受黑潮撞擊後產升的島後尾流列的空間尺度及其特性。所使用的高解析度衛星影像有SPOT、福衛二號、ERS-2、ALOS、及Sentinel五種衛星，含括光學及合成孔徑雷達影像。黑潮流速則估算自衛星測高計和錨錠式都卜勒流剖儀所推導出的資料。根據Aqua及Terra衛星的中尺度影像光譜儀(MODIS)影像發現，綠島尾流產生時，由於海水湧升及混和過程，其所在區域海水表面溫度比周圍海水降低可達2 °C，葉綠素濃度相對提升為兩倍。此外，風對於綠島尾流的空間尺度分布，扮演著重要作用。南風時，尾流列渦旋之間的長寬比為2.09、無因次寬比值為2.02; 而在北風時其值分別為1.91及2.76。In this study, we used satellite imagery to conduct a statistical study of the ocean vortex train induced by the Kuroshio Current at the leeside of Green Island, Taiwan. The spatial scale and characteristics of the ocean vortex train were analyzed from five types of satellite imagery, including optical imagery from the Satellite Pour l’Observation de la Terre and Formosat-2 satellites and synthetic aperture radar imagery from Europeon Remote Sensing Satellite, Advanced Land Observing Satellite, and Sentinel-1. Satellite altimeter data and a moored acoustic Doppler current profiler were used to calculate the velocity of Kuroshio. Data from Moderate Resolution Imaging Spectroradiometer on-board Aqua and Terra statellites showed that the sea surface temperature of the recirculation water was 2°C colder and the chlorophyll-a concentrarion was two times higher than those of the surrounding waters. These phenomena were caused by upwelling and mixing processes. Wind forcing had a pronounced effect on the characteristics of the vortex train. Satellite images showed the average aspect ratio of the vortex train to be 2.09 and the dimensionless width to be 2.02 under southerly winds, compared with 1.91 and 2.76 under northerly winds.

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Observations and Analyses of Green Island Wake from Satellite Imagery-1

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