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首页> 外文期刊>Ocean Dynamics >'The Ekman Drain': a conduit to the deep ocean for shelf material
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'The Ekman Drain': a conduit to the deep ocean for shelf material

机译：“埃克曼流失”：一条通往深海的架子材料

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A long (167 days) acoustic Doppler current profiler time series from the European continental slope west of Scotland has been analysed to investigate the influence of bathymetric steering on the slope current and the extent of down-slope transport in the bottom boundary layer. Within an interior region between the surface and bottom boundary layers, the direction of the flow is found to be remarkably consistent as required by the Taylor-Proudman theorem for geostrophic flow. The mean value of this interior flow direction is taken to be the effective direction of the bathymetry in controlling the geostrophic flow and so defines the rotation of coordinates required to determine along and cross-flow transports. Within a bottom boundary layer (BBL) of thickness ～100 m, the direction of the flow was deflected increasingly to the left with the mean veering angle -12.5° at 12 mab and a down-slope speed of 2.6 cm s~(-1). The corresponding integrated transport (the "Ekman drain") had an average value of～1.6 m~2 s~(-1) over the full observation period. This down-slope flow was significantly correlated (at 0.1 % level), with the stress applied by the along-slope flow although with considerable scatter (r.m.s. -1 m~2 s~(-1)) which suggests the influence of other forcing mechanisms. Combining the BBL volume transport with an estimate of the mean concentration of suspended paniculate material indicates an annual down-slope flux of 3.0±-0.6 tonnes m~(-1) year~(-1), of which ～0.36±0.1 tonnes m~(-1) year~(-1) is carbon. Biogeochemical measurements indicate that the carbon flux in the Ekman drain predominates over settlement of organic material through the water column over the slope and provides for relatively rapid delivery of material to deep water.
机译：分析了来自苏格兰西部欧洲大陆斜坡的一个长（167天）声学多普勒电流剖面时间序列，以研究测深转向对斜坡电流的影响以及底部边界层中下坡输送的程度。在表面边界层和底部边界层之间的内部区域内，发现流动的方向与地转流的泰勒-普鲁德曼定理所要求的非常一致。该内部流动方向的平均值被视为测深法在控制地转流中的有效方向，因此定义了确定顺流和横流传输所需的坐标旋转。在厚度约为100 m的底部边界层（BBL）中，流动方向逐渐向左偏转，在12 mab时平均转向角为-12.5°，下坡速度为2.6 cm s〜（-1） ）。在整个观测期内，相应的综合输运量（“埃克曼流失”）的平均值约为1.6 m〜2 s〜（-1）。该下坡流与沿坡流所施加的应力显着相关（在0.1％的水平），尽管具有相当大的分散性（均方根-1 m〜2 s〜（-1）），这表明了其他强迫作用的影响。机制。结合BBL体积输运量和悬浮颗粒物平均浓度的估计值，可以得出年下降坡通量为3.0±-0.6吨m〜（-1）年〜（-1），其中〜0.36±0.1吨m 〜（-1）年〜（-1）是碳。生物地球化学测量结果表明，埃克曼排水沟中的碳通量占主导地位，超过了有机物质通过斜坡上水柱的沉降，并提供了相对较快的物质输送至深水的能力。

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