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On the stability of the wind-driven circulation

机译:论风循环的稳定性

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This work examines the instabilities of steady circulations driven by stationary single-gyre wind forcing in closed rectangular basins with different aspect ratios. The stratified ocean is modeled with quasi-geostrophic 1.5-layer (equivalent-barotropic) and two-layer models. As friction is reduced, a stability threshold is encountered. In the vicinity of this threshold, unstable steady states and their unstable eigenmodes are determined. The structures of the eigenmodes and their associated energy conversion terms allow us to characterize the instabilities. In each case, the loss of stability is associated with an oscillatory instability.
机译:这项工作研究了在具有不同长宽比的封闭矩形盆地中,由固定单旋风强迫推动的稳定循环的不稳定性。分层海洋以准地转1.5层(等效正压)和两层模型建模。随着摩擦的减小,会遇到稳定性阈值。在此阈值附近,确定不稳定的稳态及其不稳定的本征模。本征模的结构及其相关的能量转换项使我们能够表征不稳定性。在每种情况下,稳定性的丧失都伴随着振荡的不稳定。

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