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
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- 巻
- 40
- 号
- 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
- ID情報
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- DOI : 10.1007/s11001-018-9372-5
- ISSN : 0025-3235
- eISSN : 1573-0581
- Web of Science ID : WOS:000499758400009