Rapid injection of near-inertial shear into the stratified upper ocean at an Antarctic Circumpolar Current front
Rapid injection of near-inertial shear into the stratified upper ocean at an Antarctic Circumpolar Current front
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DOI：
10.1002/2015gl063494
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发表时间：
2015-05-16
影响因子：
5.2
通讯作者：
Waterman, Stephanie
中科院分区：
文献类型：
--
作者：
Forryan, Alexander;Garabato, Alberto C. Naveira;Waterman, Stephanie
一个短的，强烈的风暴在南大洋的网站，在南极绕极流前附近的通道上的海洋上层的影响，其特征在于。风暴导致风引起的混合层加深，并产生惯性流。风暴后的观测表明，混合层延伸到大约50米深。随后的测量结果显示，上层海洋已经被限制，在风暴经过的12天内，在分层的沃茨中注入了近惯性切变。近惯性剪切发展的时间尺度比色散范式预测的时间尺度短1个数量级。所观察到的上层海洋分层的快速变化表明，存在一种尚未记录的、有效的机制，将近惯性切变注入分层海洋，这反过来又与湍流和混合的增强有关。
The impact on the upper ocean of the passage of a short, intense storm over a Southern Ocean site, in proximity to an Antarctic Circumpolar Current front, is characterized. The storm causes a wind-induced deepening of the mixed layer and generates an inertial current. Immediate poststorm observations indicate a mixed layer extending to approximately 50m depth. Subsequent measurements show the upper ocean to have restratified, injecting near-inertial shear in stratified waters within 1day of the storm's passage. This time scale for the development of near-inertial shear is 1 order of magnitude shorter than that predicted by the dispersion paradigm. The observed rapid changes in upper ocean stratification point to the existence of an as yet undocumented, efficient mechanism for injection of near-inertial shear into the stratified ocean that is in turn associated with enhanced turbulence and mixing.