Baroclinic instability and the mesoscale eddy field around the Lofoten Basin
Baroclinic instability and the mesoscale eddy field around the Lofoten Basin
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DOI：
10.1002/2014jc010448
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发表时间：
2015-04-01
影响因子：
3.6
通讯作者：
Isachsen, Pal Erik
中科院分区：
文献类型：
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作者：
Isachsen, Pal Erik
挪威北方以西罗弗敦盆地周围的中尺度涡动场被认为与挪威大西洋流沿沿着挪威海岸流动的涡动脱落有关。在这里，我们研究斜压不稳定的电流与地形的影响特别关注。大陆坡最陡部分的水流最不稳定。增长特征不能仅从Eady理论来理解，而需要考虑内部位涡梯度。充分发展的宏观湍流场的研究表明，涡动动能平流远离生成区域，非线性效应可能会吸引涡动统计远离线性增长制度。
The vigorous mesoscale eddy field around the Lofoten Basin west of northern Norway is thought to be related to eddy shedding from the Norwegian Atlantic Current flowing along the Norwegian coast. Here we study baroclinic instability in the current with a particular focus on the influence of topography. The flow over the steepest part of the continental slope is found to be the most unstable. The growth characteristics cannot be understood from Eady theory alone but require the consideration of interior potential vorticity gradients. A study of the fully developed macroturbulent field shows that eddy kinetic energy is advected away from the generation regions and that nonlinear effects likely draw the eddy statistics away from the linear growth regime.