Variations of Ocean Vortex Train of Green Island from Satellite Imagery

PoChun Hsu; ChenChih Lin; ChungRu Ho

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インターナショナルセッション（口頭発表）

セッション記号 A (大気水圏科学) » A-CG 大気水圏科学複合領域・一般

[A-CG10] Earth and Planetary satellite observation project Part II

2016年5月24日(火) 09:00 〜 10:30 303 (3F)

コンビーナ:*沖理子(宇宙航空研究開発機構)、早坂忠裕(東北大学大学院理学研究科)、佐藤薫(東京大学　大学院理学系研究科　地球惑星科学専攻)、佐藤正樹(東京大学大気海洋研究所)、本多嘉明(千葉大学環境リモートセンシング研究センター)、奈佐原顕郎(筑波大学生命環境系)、中島孝(東海大学情報理工学部情報科学科)、沖大幹(東京大学生産技術研究所)、松永恒雄(国立環境研究所環境計測研究センター)、高薮縁(東京大学大気海洋研究所)、村上浩(宇宙航空研究開発機構地球観測研究センター)、岡本創(九州大学)、Gail Skofronick Jackson(NASA Goddard Space Flight Center)、Paul Chang(NOAA College Park)、Crisp David(Jet Propulsion Laboratory, California Institute of Technology)、座長:本多嘉明(千葉大学環境リモートセンシング研究センター)、村上浩(宇宙航空研究開発機構地球観測研究センター)

10:00 〜 10:15

[ACG10-17] Variations of Ocean Vortex Train of Green Island from Satellite Imagery

*PoChun Hsu¹、ChenChih Lin¹、ChungRu Ho¹ (1.Department of Marine Environmental Informatics, National Taiwan Ocean University, Keelung, Taiwan)

キーワード：Kuroshio, Green Island, vortex train, satellite imagery

Kuroshio, a western boundary current, flows quickly and steadily along the east coast of Taiwan. The ocean vortex train induced by the Kuroshio on the leeside of Green Island, which is a small islet at the path of Kuroshio off southeast Taiwan, is investigated in this study. The horizontal scale and characteristics of the ocean vortex train are analyzed with five kinds of satellite imagery, including optical imagery from SPOT (Satellite Pour l'Observation de la Terre) and Formosat-2 satellites, as well as synthetic aperture radar imagery from ERS-2 (European remote sensing satellite), ALOS (Advanced Land Observing Satellite), and Sentinel-1. Satellite altimetry data and moored acoustic Doppler current profiler (ADCP) are used to calculate the velocity of Kuroshio. The ADCP data show that the velocity is enhanced on the left of the vortex train when it is formed on the leeside of Green Island. The data derived from MODIS (Moderate-resolution Imaging Spectro-radiometer) also show that the sea surface temperature of recirculation water is more than 2^oC colder and the chlorophyll-a concentration is two times higher than the surrounding waters. Wind forcing may affect the vortex train obviously. The averaged aspect ratio and dimensionless width of vortex train derived from available satellite images are 2.09 and 2.02, respectively for the cases of southerly, and are 1.91 and 2.76, respectively for the cases of northerly.