Wind-driven freshwater buildup and release in the Beaufort Gyre constrained by mesoscale eddies
Wind-driven freshwater buildup and release in the Beaufort Gyre constrained by mesoscale eddies
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DOI：
10.1002/2015gl065957
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发表时间：
2016-01-16
影响因子：
5.2
通讯作者：
Spall, Michael A.
中科院分区：
文献类型：
--
作者：
Manucharyan, Georgy E.;Spall, Michael A.
最近，博福特环流已经积累了超过20，000 km（3）的淡水，这是对强反气旋大气风的响应，这种风已经在环流上盛行了近20年。在这里，我们探讨的关键物理过程影响的积累和释放的淡水在一个理想化的涡旋解决模型的博福特环流。我们证明，一个现实的盐跃层可以实现时，其加深的趋势，由于埃克曼泵抵消了中尺度涡的累积作用。基于这种平衡，我们推导出盐跃层的深度和它的自旋的时间尺度的分析标度，并强调其明确依赖于涡动动力学。我们的研究进一步表明，博福特环流目前处于对大气风高度敏感的状态。然而，表面应力的加剧将不可避免地导致饱和的淡水contenta约束固有的中尺度涡动动力学的复杂性。
Recently, the Beaufort Gyre has accumulated over 20,000km(3) of freshwater in response to strong anticyclonic atmospheric winds that have prevailed over the gyre for almost two decades. Here we explore key physical processes affecting the accumulation and release of freshwater within an idealized eddy-resolving model of the Beaufort Gyre. We demonstrate that a realistic halocline can be achieved when its deepening tendency due to Ekman pumping is counteracted by the cumulative action of mesoscale eddies. Based on this balance, we derive analytical scalings for the depth of the halocline and its spin-up time scale and emphasize their explicit dependence on eddy dynamics. Our study further suggests that the Beaufort Gyre is currently in a state of high sensitivity to atmospheric winds. However, an intensification of surface stress would inevitably lead to a saturation of the freshwater contenta constraint inherently set by the intricacies of the mesoscale eddy dynamics.