Japan Geoscience Union Meeting 2016

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International Session (Oral)

Symbol A (Atmospheric and Hydrospheric Sciences) » A-CG Complex & General

[A-CG10] Earth and Planetary satellite observation projects Part II: Satellite Earth Environment Observation

Tue. May 24, 2016 9:00 AM - 10:30 AM 303 (3F)

Convener:*Riko Oki(Japan Aerospace Exploration Agency), Tadahiro Hayasaka(Graduate School of Science, Tohoku University), Kaoru Sato(Department of Earth and Planetary Science, Graduate School of Science, The University of Tokyo), Masaki Satoh(Atmosphere and Ocean Research Institute, The University of Tokyo), Yoshiaki HONDA(Center for Environmental Remote Sensing, Chiba University), Kenlo Nasahara(Faculty of Life and Environmental Sciences, University of Tsukuba), Takashi Nakajima(Tokai University, School of Information Science & Technology, Dept. of Human & Information Science), Taikan Oki(Institute of Industrial Science, The University of Tokyo), Tsuneo Matsunaga(Center for Environmental Measurement and Analysis, National Institute for Environmental Studies), Yukari Takayabu(Atmosphere and Ocean Research Institute, the University of Tokyo), Hiroshi Murakami(Earth Observation Research Center, Japan Aerospace Exploration Agency), Hajime Okamoto(Kyusyu University), Gail Skofronick Jackson(NASA Goddard Space Flight Center), Paul Chang(NOAA College Park), David Crisp(Jet Propulsion Laboratory, California Institute of Technology), Chair:Yoshiaki Honda(Center for Environmental Remote Sensing, Chiba University), Hiroshi Murakami(Earth Observation Research Center, Japan Aerospace Exploration Agency)

10:00 AM - 10:15 AM

[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)

Keywords: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 2oC 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.