Submesoscale Coherent Vortices in the Gulf Stream
Submesoscale Coherent Vortices in the Gulf Stream
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DOI：
10.1029/2019gl081919
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发表时间：
2019-03
影响因子：
5.2
通讯作者：
J. Gula;T. Blacic;R. Todd
中科院分区：
文献类型：
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作者：
J. Gula;T. Blacic;R. Todd
地震图像和沿着美国东海岸的墨西哥湾流锋面的滑翔剖面捕捉到了深的、透镜状的亚中尺度特征。这些特征半径为5-20公里，厚度为150-300米，位于500米以上的深度。这些是反气旋亚中尺度相干涡旋的典型特征。采用亚中尺度分辨的真实模拟方法，再现了具有相同特征的亚中尺度相干涡，并分析了其生成机制。亚中尺度相干涡主要产生于墨西哥湾流与查尔斯顿隆起（一种深地形特征）的交汇处，这是由于地形的摩擦效应和尾迹中的强烈混合。这些次中尺度相干涡旋可以从查尔斯顿厚的底部混合层长距离输送沃茨，并将其传播到副热带环流内。它们对热量和盐分分布的净影响仍有待量化。
Seismic images and glider sections of the Gulf Stream front along the U.S. eastern seaboard capture deep, lens‐shaped submesoscale features. These features have radii of 5–20 km, thicknesses of 150–300 m, and are located at depths greater than 500 m. These are typical signatures of anticyclonic submesoscale coherent vortices. A submesoscale‐resolving realistic simulation, which reproduces submesoscale coherent vortices with the same characteristics, is used to analyze their generation mechanism. Submesoscale coherent vortices are primarily generated where the Gulf Stream meets the Charleston Bump, a deep topographic feature, due to the frictional effects and intense mixing in the wake of the topography. These submesoscale coherent vortices can transport waters from the Charleston Bump's thick bottom mixed layer over long distances and spread them within the subtropical gyre. Their net effect on heat and salt distribution remains to be quantified.