Recent advances in ocean-circulation research on the Yellow Sea and East China Sea shelves |
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Authors: | Atsuhiko Isobe |
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Institution: | (1) Department of Earth System Science and Technology, Kyushu University, Kasuga-Koen, Kasuga 816-8580, Japan;(2) Present address: Center for Marine Environmental Studies, Ehime University, Bunkyo-cho, Matsuyama 790-8577, Japan |
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Abstract: | Recent advances in ocean-circulation research on the Yellow Sea and East China Sea shelves are summarized. Observations using
acoustic Doppler current profilers (ADCPs) suggest that the connectivity of mean-volume-transports is incomplete between the
Tsushima (2.6 Sverdrups; 1 Sv = 106 m3/s) and Taiwan Straits (1.2 Sv). The remaining 1.4-Sv transport must be supplied by onshore Kuroshio intrusion across the
East China Sea shelf break. The Yellow Sea Warm Current is not a persistent ocean current, but an episodic event forced by
northerly winter monsoon winds. Nevertheless, the Cheju Warm Current is detected clearly regardless of season. In addition,
the throughflow in the Taiwan Strait may be episodic in winter when northeasterly winds prevail. The throughflow strengthens
(vanishes) under moderate (severe) northeasterly wind conditions. Using all published ADCP-derived estimates, the throughflow
transport (V) in the Taiwan Strait is approximated as where V
0, V
1, K are 1.2 Sv, 1.3 Sv, and 157 days, respectively, t is yearday, and T is 365.2422 days (i.e., 1 year). The difference between the throughflow transports in the Tsushima and Taiwan Straits suggests
that the onshore Kuroshio intrusion across the shelf break increases from autumn to winter. The China Coastal Current has
been observed in winter, but shelf currents are obscure in summer. |
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Keywords: | East China Sea Yellow Sea Tsushima Warm Current Taiwan Warm Current Yellow Sea Warm Current China Coastal Current Cheju Warm Current |
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