Characteristics of temperature and current variations in the intermediate-deep layer of Oshima East Channel, Sagami Bay

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  • Wang Qi
    Graduate School of Marine Science and Technology, Tokyo University of Marine Science and Technology
  • Kitade Yujiro
    Graduate School of Marine Science and Technology, Tokyo University of Marine Science and Technology
  • Nemoto Masao
    Graduate School of Marine Science and Technology, Tokyo University of Marine Science and Technology

Bibliographic Information

Other Title
  • 相模湾大島東水道の中深層における水温・流速変動の特性
  • サガミワン オオシマ ヒガシスイドウ ノ チュウ シンソウ ニ オケル スイオン ・ リュウソク ヘンドウ ノ トクセイ

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Abstract

<p>Mooring observations were carried out at the stations on the northeastern slope of Oshima East Channel and the continental shelf off Mera from 22 May to 11 September 2007. Observed velocity was dominantly varied at periods around 3.7days at both the stations. The 3.7days oscillation observed at depths of 703 m-1020 m in Sagami Tough was approximately in phase with the sea-level change at Mera. Sea level was fluctuated dominantly at periods of several days (2-11 days) at all the stations on the coast from Choshi to Omaezaki and in Oshima, whose signal was propagated along the coast from Choshi to Ito with speeds of 1.5-2.2 m s－1. In addition, we found significant coherency at periods around 3.7 days between velocity at the depths 703 m-1020 m in the trough and wind at Choshi and Oshima. Accordingly, we suggested the coastal-trapped wave was generated by the windon the coast. Based on Brink and Chapman (1987), we investigated the modal structures of the 3.7-days fluctuationalong the section crossing the channel and then revealed the correspondence of the second mode to the mooring data. Current velocity at the 703 m depth was suddenly strengthened in the direction of outflow from the bay in the middle of August and being reversed at the end of the month with speed reaching as fast as 15 cm s－1. Low-salinity water was also observed at depths of 250 m-550 m in the bay at the end of this month being coincided with this event. This may be because water originated from the Oyashio flowed into the bay due to the offward shift of the Kuroshio axis induced by a cold core eddy moving westward.</p>

Journal

  • Oceanography in Japan

    Oceanography in Japan 22 (1), 1-18, 2013-01-15

    The Oceanographic Society of Japan

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