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首页> 外文期刊>Journal of Physical Oceanography >Modulation of Near-Inertial Oscillations by Low-Frequency Current Variations on the Inner Scotian Shelf
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Modulation of Near-Inertial Oscillations by Low-Frequency Current Variations on the Inner Scotian Shelf

机译：内斯科架上的低频电流变化对近惯性振荡的调制

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Near-inertial oscillations (NIOs) on the inner Scotian shelf are studied using observations, a simple slab model, and two operational shelf circulation models. High-frequency radar and ADCP observations from December 2015 to February 2016 show that individual NIO events forced by time-varying wind stress typically lasted for three to four inertial periods. NIOs with speeds exceeding 0.25 m s(-1) were observed in the offshore part of the study region, but their amplitudes decreased shoreward within similar to 40 km of the coast. The NIOs had spatial scales of similar to 80 and similar to 40 km in the alongshore and cross-shore directions, respectively. The NIO phases varied moving from west to east, consistent with the typical movement of winter storms across the study region. Evolving rotary spectral analysis reveals that the peak frequency f(p) of the NIOs varied with time by similar to 7% of the local inertial frequency. The variation in f(p) can be explained in part by local wind forcing as demonstrated by the slab model. The remaining variation in f(p) can be explained in part by variations in the background vorticity associated with changes in the strength and position of the Nova Scotia Current, an unstable baroclinic boundary current that runs along the coast to the southwest. Two operational shelf circulation models are used to examine the abovementioned features in the high-frequency-radar and ADCP observations. The models reproduce the spatial structure of the NIOs and, in a qualitative sense, the temporal variations of f(p).
机译：使用观测值，一个简单的平板模型和两个可操作的层架循环模型研究了内斯科阶层架上的近惯性振荡（NIO）。从2015年12月到2016年2月的高频雷达和ADCP观测表明，由时变风应力强迫的单个NIO事件通常持续三到四个惯性周期。在研究区域的近海部分观测到速度超过0.25 m s（-1）的NIO，但它们的振幅在接近海岸40 km的范围内向岸减小。 NIO在沿海和跨岸方向的空间比例分别接近80 km和40 km。 NIO阶段从西向东变化，这与整个研究区域冬季风暴的典型变化一致。不断发展的旋转频谱分析表明，NIO的峰值频率f（p）随时间变化，约为局部惯性频率的7％。 f（p）的变化可以部分由平板模型所示的局部风力来解释。 f（p）的其余变化可以部分由背景涡度的变化来解释，该背景涡度与新斯科舍海流的强度和位置的变化有关，新斯科舍海流是一种不稳定的斜压边界流，其沿着海岸一直向西南延伸。在高频雷达和ADCP观测中，使用了两个可操作的层架循环模型来检验上述特征。这些模型再现了NIO的空间结构，并从质的角度再现了f（p）的时间变化。

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