日本地球惑星科学連合2016年大会

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インターナショナルセッション（ポスター発表）

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23日(月) 17:15 〜 18:30 ポスター会場 (国際展示場 6ホール)

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)

17:15 〜 18:30

[ACG10-P12] Eddy Effect on the Kuroshio East of Taiwan from Satellite Altimetry

*Chungru Ho1、Po-Chun Hsu1、Chen-Chih Lin1、Shih-Jen Huang1 (1.Natl. Taiwan Ocean Univ.)

キーワード：Kuroshio, meander, eddy, satellite altimetry

Kuroshio is a western boundary current in the North Pacific Ocean. It flows northward along the east coast of Taiwan. Previous studies have shown that there is an eddy-rich zone located at 18°-26°N, 122°-160°E. The westward propagating eddies may affect the axis of Kuroshio when they impinge the Kuroshio east of Taiwan. To more understand the phenomenon, satellite altimeter data are used to investigate effects of oceanic mesoscale eddy on the Kuroshio from 18°N to 26°N. The Kuroshio axis is defined as a line with the maximum surface velocity along the Kuroshio path. The velocity of Kuroshio is calculated from the absolute dynamic topography data derived from satellite altimetry with the geostrophic relations. The results show that the Kuroshio meander occurred 13 times from 1993 to 2013 which were caused by westward or northward moving cold eddies when they propagated to the east of Taiwan. The average duration of the meanderings was 27 ± 20 days, and the maximum duration was 80 days. The farthest position of the Kuroshio axis meandering was approximately 270 km from the average Kuroshio axis. It is affected by the size of the cold eddy. Under the circumstances of a cold eddy, the mean speed of the Kuroshio axis drops to 0.63 m/s, which is approximately 84% of the seasonal average.