On the concentration of near-inertial waves in anticyclones
On the concentration of near-inertial waves in anticyclones
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DOI：
10.1017/jfm.2015.252
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发表时间：
2015-03
影响因子：
3.7
通讯作者：
Eric Danioux;J. Vanneste;O. Bühler
中科院分区：
文献类型：
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作者：
Eric Danioux;J. Vanneste;O. Bühler
在稳定背景流中传播的近惯性波（NIW）的一个被忽视的守恒定律为研究这些波在反气旋涡度区域的集中提供了新的视角。守恒定律意味着这种浓度是初始均匀波场所经历的空间尺度减小的直接结果。混合层 NIW 减重模型的缩放参数和数值模拟证实了这一解释，并阐明了背景流强度相对于色散的影响。
An overlooked conservation law for near-inertial waves (NIWs) propagating in a steady background flow provides a new perspective on the concentration of these waves in regions of anticyclonic vorticity. The conservation law implies that this concentration is a direct consequence of the decrease in spatial scales experienced by an initially homogeneous wave field. Scaling arguments and numerical simulations of a reduced-gravity model of mixed-layer NIWs confirm this interpretation and elucidate the influence of the strength of the background flow relative to the dispersion.