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首页> 外文期刊>Journal of Geophysical Research, C. Oceans: JGR >Measurements of the turbulent energy dissipation rate and an evaluation of the dispersion process of the Changjiang Diluted Water in the East China Sea
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Measurements of the turbulent energy dissipation rate and an evaluation of the dispersion process of the Changjiang Diluted Water in the East China Sea

机译：东海长江稀释水湍流能量耗散率的测量与扩散过程评价。

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摘要

The large amount of fresh water discharged from Changjiang spreads over the East China Sea continental shelf as low salinity water, particularly in the summer season. To understand the primary production in the East China Sea, it is necessary to clarify the dispersion process of the Changjiang Diluted Water (CDW), since the high production area appears to cover the CDW. In this study, the dispersion process of the CDW was evaluated through the estimation of the turbulent energy dissipation rate in the CDW and calculation of the divergence in the CDW using satellite-tracked drifters. A large value of was observed just above the bottom and in the surface layer, whose magnitude was sometimes greater than 10?7 W kg-1. On the other hand, a small value of , less than 10?8 W kg?1, was found just beneath the CDW. The small value of leads to a small value of the vertical eddy diffusivity of less than 10?5 m2s-1. The vertical advection of the bottom water is likely to be a major process for increasing the salinity, since the horizontal diffusion would not play a significant role if the usual magnitude of the horizontal diffusivity is assumed. Calculation of divergence in the surface layer, using the drifters' data, also suggests that upward velocity of O(10?5) m s-1 over the CDW area is expected. The vertical transport from the bottom layer could increase the salinity of the CDW, and also carry the nutrients into the euphotic zone resulting in biological production.
机译：长江排放的大量淡水以低盐度水的形式分布在东海大陆架上，特别是在夏季。为了了解东海的初级生产，有必要弄清长江稀释水（CDW）的分散过程，因为高产区似乎覆盖了CDW。在这项研究中，通过估算CDW的湍流能量耗散率并使用卫星跟踪的漂移器计算CDW的发散度来评估CDW的分散过程。在底部正上方和表层中观察到较大的值，其大小有时大于10？7 W kg-1。另一方面，在CDW的下方发现了一个小于10-8 W W·kg-1的小值。较小的值将导致小于10？5 m2s-1的垂直涡流扩散率的较小值。底部水的垂直对流可能是增加盐度的主要过程，因为如果假定水平扩散率的通常大小，则水平扩散将不会发挥重要作用。利用漂移数据计算表面层的发散度，也表明在CDW区域上O（10？5）m s -1的上升速度是可以预期的。来自底层的垂直运输可以增加CDW的盐度，也可以将营养物带入富营养区，从而导致生物生产。

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