Turbulent mixing in a deep fracture zone on the Mid-Atlantic Ridge
Turbulent mixing in a deep fracture zone on the Mid-Atlantic Ridge
复制标题
大西洋中脊深断裂带的湍流混合
DOI：
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发表时间：
2017
期刊：
影响因子：
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通讯作者：
L. S. Laurent
中科院分区：
文献类型：
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作者：
L. Clement;A. Thurnherr;L. S. Laurent
摘要在巴西盆地东部深层混合作用强烈的地区，迈阿密海脊断裂带是海底沃茨的通道。负责的机制，深湍流混合内的许多miraculan断裂带，无论是受本地或非本地的峡谷地形，仍然受到争议。为了区分这些机制并辨别峡谷平均流，两个系泊装置在远离岩床/收缩处的深峡谷上取样。在岩床处加速的两层交换流在深层向峡谷上方输送0.04-0.10 Sv（1 Sv <$106 m3 s−1）。在门槛处，湍流动能e的耗散率增加，从微观结构剖面仪测量，并从垂直动能的参数化推断。跨窗台密度和微观结构断面揭示了潜在的溢出水力控制和调制的两周潮汐。在大潮到小潮期间，在3500米以下，两层界面附近的e变化范围为O（10−9）到O（10−10）W kg−1。
AbstractMidocean ridge fracture zones channel bottom waters in the eastern Brazil Basin in regions of intensified deep mixing. The mechanisms responsible for the deep turbulent mixing inside the numerous midocean fracture zones, whether affected by the local or the nonlocal canyon topography, are still subject to debate. To discriminate those mechanisms and to discern the canyon mean flow, two moorings sampled a deep canyon over and away from a sill/contraction. A 2-layer exchange flow, accelerated at the sill, transports 0.04–0.10-Sv (1 Sv ≡ 106 m3 s−1) up canyon in the deep layer. At the sill, the dissipation rate of turbulent kinetic energy e increases as measured from microstructure profilers and as inferred from a parameterization of vertical kinetic energy. Cross-sill density and microstructure transects reveal an overflow potentially hydraulically controlled and modulated by fortnightly tides. During spring to neap tides, e varies from O(10−9) to O(10−10) W kg−1 below 3500 m around the 2-layer inte...
大西洋中脊溢流的深海通道中的湍流和精细结构
DOI：
10.1016/j.dsr.2015.01.001
发表时间：
2015
期刊：
影响因子：
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作者：
Tippenhauer;Dengler;Fischer;Kanzow
通讯作者：
Kanzow