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首页> 外文期刊>Deep-Sea Research >Turbulence and finestructure in a deep ocean channel with sill overflow on the mid-Atlantic ridge
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Turbulence and finestructure in a deep ocean channel with sill overflow on the mid-Atlantic ridge

机译：深大西洋海槽中的湍流和精细结构，大西洋中脊上有基石溢流

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Diapycnal mixing in the deep ocean is known to be much stronger in the vicinity of rough topography of mid-ocean ridges than above abyssal plains. In this study a horizontally profiling microstructure probe attached to an autonomous underwater vehicle (AUV) is used to infer the spatial distribution of the dissipation rate of turbulent kinetic energy (epsilon) in the central valley of the Mid-Atlantic Ridge. To the authors' knowledge, this is the first successful realization of a horizontal, deep-ocean microstructure survey. More than 22 h of horizontal, near-bottom microstructure data from the Lucky Strike segment (37 degrees N) are presented. The study focuses on a channel with unidirectional sill overflow. Density was found to decrease along the channel following the mean northward flow of 3 to 8 cm/s. The magnitude of the rate of turbulent kinetic energy dissipation was distributed asymmetrically relative to the position of the sill. Elevated dissipation rates were present in a segment 1-4 km downstream (north) of the sill with peak values of 1 x 10(-7) W/kg. Large flow speeds and elevated density finestructure were observed within this segment. Lowered hydrographic measurements indicated unstable stratification in the same region. The data indicate that hydraulic control was established at least temporarily. Inside the channel at wavelengths between 1 m and 250 m the slopes of AUV-inferred horizontal temperature gradient spectra were found to be consistent with turbulence in the inertial-convective subrange. Integrated temperature gradient variance in this wavelength interval was consistent with an epsilon(2/3) dependence. The results illustrate that deep-reaching AUVs are a useful tool to study deep ocean turbulence over complex terrain where free-falling and lowered turbulence measurements are inefficient and time-consuming. (C) 2015 Elsevier Ltd. All rights reserved.
机译：在深海中部崎of的地形附近，深海中的斜向混合比深海平原上的混合要强得多。在这项研究中，将水平剖面微结构探针连接到自主水下航行器（AUV）上，以推断大西洋中脊中央谷地湍动能（ε）耗散率的空间分布。据作者所知，这是水平深海微观结构调查的首次成功实现。展示了来自“幸运罢工”段（北纬37度）超过22小时的水平，近底部的微观结构数据。该研究集中在具有单向门槛溢流的通道上。随着平均向北流动3至8 cm / s，沿通道密度降低。动能耗散速率的幅度相对于门槛位置不对称分布。窗台下游（北）1-4公里处的耗散率升高，峰值为1 x 10（-7）W / kg。在该段内观察到较大的流速和较高的密度精细结构。较低的水文测量结果表明同一地区的分层不稳定。数据表明至少暂时建立了液压控制。在通道内的1 m和250 m之间的波长处，AUV推断的水平温度梯度谱的斜率与惯性对流子范围中的湍流一致。在此波长间隔内的积分温度梯度变化与epsilon（2/3）依赖性一致。结果表明，深空AUV是研究复杂地形上的深海湍流的有用工具，在该地形上自由落体和降低的湍流测量效率低下且费时。 （C）2015 Elsevier Ltd.保留所有权利。

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