Seasonality of the Kuroshio transport revealed in a Kuroshio assimilation system

Atsuhiko Isobe, Masafumi Kamachi, Yukio Masumoto, Hiroshi Uchida, Tsurane Kuragano

研究成果: Contribution to journalArticle査読

7 被引用数 (Scopus)

抄録

The seasonal variation of the Kuroshio transport south of Japan has been investigated using the results of an assimilation model. Annual and semiannual variations of the transport and dynamic depth anomaly are reconstructed by CEOF (complex orthogonal empirical function) analysis. In the basin west of the Izu-Ogasawara Ridge, the annual component of the variation propagates westward with the phase speed of the long Rossby wave associated with the first baroclinic mode. The variation also shows a similar tendency to that reproduced in a wind-driven, two-layer model with a ridge. This suggests that the annual variation revealed in the assimilation model is associated with the baroclinic first mode of motion excited above the Izu-Ogasawara Ridge. Furthermore, it is found that both the semiannual component and the annual component are important members determining the seasonal variation of the Kuroshio transport south of Japan. The semiannual component is revealed as a double gyre pattern in the basin west of the Izu-Ogasawara Ridge.

本文言語英語
ページ(範囲)321-328
ページ数8
ジャーナルJournal of Oceanography
60
2
DOI
出版ステータス出版済み - 4 2004

All Science Journal Classification (ASJC) codes

  • Oceanography

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