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首页> 外文期刊>Journal of Physical Oceanography >Wind-Driven Recirculations and Exchange in the Labrador and Irminger Seas
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Wind-Driven Recirculations and Exchange in the Labrador and Irminger Seas

机译：拉布拉多和艾明格海的风循环和交换

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摘要

It is demonstrated that recently observed cyclonic recirculation gyres in the Irminger and Labrador Seas may be forced by the strong cyclonic wind stress curl that develops each winter seaward of the east coast of Greenland. Idealized analytical and numerical models forced with such variable winds over a sloping bottom reproduce the essential aspects of the observed gyres (strength, location, and horizontal and vertical length scales). The communication between the forcing region in the Irminger Sea and the recirculation to the west is achieved by baroclinic topographic Rossby wave propagation along potential vorticity contours. The circulation is characterized as a time-dependent, stratified, topographic beta plume. For weak stratification, as found in the subpolar North Atlantic, the recirculation strength exhibits only weak seasonal variability, consistent with the observations, even though the forcing is active only during the winter. Baroclinic Rossby waves that develop when the wind forcing ceases in springtime interact with the bottom to provide a source of cyclonic vorticity that maintains the circulation until the wind strengthens again in the following winter.
机译：结果表明，最近在艾明格和拉布拉多海中观测到的旋风回旋涡流可能受到格陵兰岛东海岸每个冬季向海发展的强烈旋风风应力卷曲的推动。理想的分析模型和数值模型在倾斜的底部受到这种可变的风的作用，可以再现观测到的回旋的基本方面（强度，位置以及水平和垂直长度比例）。通过斜压地形Rossby波沿着潜在涡度等高线的传播，实现了艾明格海强迫区域与西侧回流之间的连通。循环的特征是随时间变化的分层地形β羽。对于弱分层，如在亚极北大西洋发现的那样，尽管强迫作用仅在冬季才起作用，但再循环强度仅表现出较弱的季节性变化，与观测结果一致。春季，当强迫停止时会产生斜压式罗斯比波，这些波与底部相互作用，形成旋风涡源，维持旋流，直到下个冬季风增强。

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