Seasonality of the Kuroshio Transport Revealed in a Kuroshio Assimilation System |
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| Authors: | Atsuhiko Isobe Masafumi Kamachi Yukio Masumoto Hiroshi Uchida Tsurane Kuragano |
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| Institution: | (1) Department of Earth System Science and Technology, Interdisciplinary Graduate School of Engineering Sciences, Kyushu University, Kasuga, Fukuoka 816-8580, Japan;(2) Oceanographic Research Department, Meteorological Research Institute, Nagamine, Tsukuba 305-0052, Japan;(3) Department of Earth and Planetary Science, Graduate School of Science, The University of Tokyo, Bunkyo-ku, Tokyo 113-0033, Japan;(4) Frontier Research System for Global Change, Showa, Kanazawa-ku, Yokohama, 236-0001, Japan |
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| Abstract: | 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.
This revised version was published online in July 2006 with corrections to the Cover Date. |
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| Keywords: | Kuroshio transport seasonal variation assimilation model CEOF analysis |
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