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首页> 外文期刊>Journal of Geophysical Research. Biogeosciences >Effect of barotropic tidal rectification on low-frequency circulation near the shelf break in the northern Bay of Biscay
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Effect of barotropic tidal rectification on low-frequency circulation near the shelf break in the northern Bay of Biscay

机译：正压潮汐整流对比斯开湾北部搁板断裂附近低频环流的影响

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摘要

Current meter data collected in the Bay of Biscay are used with a barotropic model to study the effect of the tidal rectification on the low-frequency circulation near the shelf break. Data collected at two different locations are analyzed and show that the tidal forcing terms and the low-frequency circulation are completely different at the two locations. In order to obtain a quantitative interpretation of these differences, a tidal forcing with both M2 and S2 waves is introduced in a barotropic tidal rectification model. We focus on the rectification process due to the "stretching of the water columns" alone, in the realistic case of large-amplitude topography. A first theoretical result is that the bichromatic forcing generates a nonlinear variation of the residual current which depends on only one nondimensional parameter. This parameter is a function of the barotropic flow and of the wave frequencies. A second result is that the low-frequency circulation generated by such a rectification process (including the two waves) is twice as large in spring tide than in neap tide. Finally, the model applied to both moorings confirms that the tidal rectification is much weaker at one mooring, the northwest one, than at the other, where the tidal rectification can explain 50% of the observed low-frequency circulation.
机译：在比斯开湾收集的电流表数据与正压模型一起使用，以研究潮汐整流对架子断裂附近低频环流的影响。分析了在两个不同位置收集的数据，结果表明，两个位置的潮汐强迫项和低频环流完全不同。为了获得对这些差异的定量解释，在正压潮汐整流模型中引入了具有M2和S2波的潮汐强迫。在大振幅地形的实际情况下，我们只关注由于“水柱的拉伸”而导致的整流过程。第一个理论结果是，双色强迫产生了残余电流的非线性变化，该非线性变化仅取决于一个无量纲的参数。该参数是正压流量和波频率的函数。第二个结果是，由这种整流过程产生的低频循环（包括两波）在春季潮汐中是在新生潮汐中的两倍。最后，应用于两个系泊的模型证实，在一个系泊处（西北系）的潮汐整流要弱于在另一个系泊处，因为该潮汐整流可以解释所观测到的低频环流的50％。

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