論文

査読有り 筆頭著者 責任著者
2019年12月

Characteristics of an atypical large-meander path of the Kuroshio current south of Japan formed in September 2017

MARINE GEOPHYSICAL RESEARCH
  • Akira Nagano
  • ,
  • Yusuke Yamashita
  • ,
  • Takuya Hasegawa
  • ,
  • Keisuke Ariyoshi
  • ,
  • Hiroyuki Matsumoto
  • ,
  • Masanao Shinohara

40
4
開始ページ
525
終了ページ
539
記述言語
英語
掲載種別
研究論文(学術雑誌)
DOI
10.1007/s11001-018-9372-5
出版者・発行元
SPRINGER

Since September 2017, the Kuroshio has taken a large-meander (LM) path in the region south of Japan. We examined characteristics of the 2017-present LM path in comparison with previous LM paths, using tide gauge, altimetric sea surface height, and bottom pressure data. The 2017-present LM path was formed from a path passing through a channel south of Hachijo-jima Island, while a typical LM path originated from a path through a channel north of Miyake-jima Island. The meander trough of this atypical path was found to be shifted far to the east and to vary on a timescale of months. These characteristics are different from those of a typical LM path but they are similar to those of the 1981-1984 LM path. Therefore, we identified two types of LM path; a stable and unstable LM paths. The 2017-present unstable type large meander has a zonal scale greater than that of the 2004-2005 stable type large meander and protrudes from the eastern boundary of the Shikoku Basin, i.e., Izu-Ogasawara Ridge. No significant bottom pressure depression was observed, associated with the formation of the 2017-present LM path, indicating that baroclinic instability was not important in the formation of this LM path. Due to no significant bottom steering, even during the 2017-present LM period, a mesoscale current path disturbance occurred southeast of Kyushu, propagated eastward, and amplified the offshore displacement of the Kuroshio.

リンク情報
DOI
https://doi.org/10.1007/s11001-018-9372-5
Web of Science
https://gateway.webofknowledge.com/gateway/Gateway.cgi?GWVersion=2&SrcAuth=JSTA_CEL&SrcApp=J_Gate_JST&DestLinkType=FullRecord&KeyUT=WOS:000499758400009&DestApp=WOS_CPL
ID情報
  • DOI : 10.1007/s11001-018-9372-5
  • ISSN : 0025-3235
  • eISSN : 1573-0581
  • Web of Science ID : WOS:000499758400009

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