Spontaneous generation and impact of inertia‐gravity waves in a stratified, two‐layer shear flow
Spontaneous generation and impact of inertia‐gravity waves in a stratified, two‐layer shear flow
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分层双层剪切流中惯性重力波的自发产生和影响
DOI：
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发表时间：
2003
期刊：
影响因子：
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通讯作者：
T. Haine
中科院分区：
文献类型：
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作者：
Paul D. Williams;Peter L. Read;T. Haine
惯性重力波普遍存在于大气和海洋的分层部分。它们是由局部速度切变、与地形的相互作用以及作为地转（或自发）调整辐射产生的。然而，关于它们与大尺度流动相互作用的细节知之甚少。我们报告了一个联合模型/实验室研究的流动，其中惯性重力波是由一个不断发展的大尺度模式产生的自发调整辐射。我们表明，它们对大尺度动力学的后续影响通常很小。然而，在从一个大尺度模态到另一个大尺度模态的潜在转换附近，在同时对多个模态斜压不稳定的气流中，惯性重力波可能强烈影响实际发生的模态的选择。
Inertia‐gravity waves exist ubiquitously throughout the stratified parts of the atmosphere and ocean. They are generated by local velocity shears, interactions with topography, and as geostrophic (or spontaneous) adjustment radiation. Relatively little is known about the details of their interaction with the large‐scale flow, however. We report on a joint model/laboratory study of a flow in which inertia‐gravity waves are generated as spontaneous adjustment radiation by an evolving large‐scale mode. We show that their subsequent impact upon the large‐scale dynamics is generally small. However, near a potential transition from one large‐scale mode to another, in a flow which is simultaneously baroclinically‐unstable to more than one mode, the inertia‐gravity waves may strongly influence the selection of the mode which actually occurs.