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首页> 外文期刊>Journal of Geophysical Research, C. Oceans: JGR >Analysis of instability and mesoscale motion off southern Norway
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Analysis of instability and mesoscale motion off southern Norway

机译：挪威南部海域的不稳定性和中尺度运动分析

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摘要

Instability and mesoscale motion in the Norwegian Coastal Current are investigated, with particular reference to explaining why recurrent anticyclonic eddies are observed in the area off the southern tip of Norway. A numerical simulation is performed for the year 2001 with a continuously stratified, σ coordinate ocean model. The model results are analyzed by combining energy diagnostics with potential vorticity analysis. The model produces recurrent anticyclonic eddies in the area of observed eddy activity. Both barotropic and baroclinic instabilities are found along the coast east of the recurring eddy region, i.e., upstream in the Norwegian Coastal Current. Very few signs of instability are seen in the eddy region itself. This indicates that the origin of the eddies is farther east and that both barotropic and baroclinic instabilities contribute to the generation of the eddies. The instability vary considerably throughout the year, with most instability in the autumn and winter and least instability in the summer. A correspondence between this seasonal dependency of the instability and outbreak events of low-salinity water from the Skagerrak is found. In the aftermath of every simulated outbreak event an anticyclonic eddy is seen off the southern tip of Norway, reflecting that the outbreak events initiate stronger instability and thereby are responsible for the generation of the anticyclonic eddies.
机译：对挪威沿海海流的不稳定性和中尺度运动进行了研究，特别是要解释为什么在挪威南端附近地区观察到周期性的反气旋涡。使用连续分层的σ坐标海洋模型对2001年进行了数值模拟。通过将能量诊断与潜在涡度分析相结合来分析模型结果。该模型在观察到的涡流活动区域中产生反周期的旋风涡流。在反复出现的涡流区以东，即挪威沿海海流的上游，发现正压和斜压不稳定性。在涡流区域本身很少看到不稳定的迹象。这表明涡流的起源更远，并且正压和斜压的不稳定性都有助于涡流的产生。全年的不稳定程度差异很大，秋季和冬季的不稳定程度最大，夏季的不稳定程度最小。发现了这种不稳定的季节性依赖性和来自Skagerrak的低盐度水爆发事件之间的对应关系。在每个模拟爆发事件的后果之后，在挪威的南端发现了一个反气旋涡，这反映出爆发事件引发了更强的不稳定性，从而导致了反气旋涡的产生。

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