Vertical mixing in the bottom mixed layer near the continental shelf break in the East China Sea |
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| Authors: | Takeshi Matsuno Seiichi Kanari Chikashi Kobayashi Toshiyuki Hibiya |
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| Institution: | (1) Faculty of Fisheries, Nagasaki University, 1-14 Bunkyo, 852 Nagasaki, Japan;(2) Department of Geophysics, Faculty of Science, Hokkaido University, Kita-10, Nishi-8, Kita-ku, 060 Sapporo, Japan |
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| Abstract: | The strength of the vertical mixing in the bottom mixed layer near the continental shelf break in the East China Sea was directly measured with the Micro-Scale Profiler (MSP). It has been shown that there is no significant statistical relation between the turbulent energy dissipation  and the degree of the stratificationN
2. It seems that the vigorous turbulence occurs not constantly but intermittently in the bottom mixed layer so that a large variation of is found depending on the time. In contrast to , the coefficient of the vertical eddy diffusivityK
z is mostly determined byN such thatK
z is large in the bottom mixed layer and small in the thermocline. Large value ofK
z in the bottom mixed layer is also found in the time series ofK
z estimated in terms of Richardson number calculated from the data obtained with electromagnetic current meters. The value ofK
z more than 10 cm2s–1 frequently occur in the layer of 20–25 m thick just above the bottom. |
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| Keywords: | |
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