...
  • 主题
高级搜索  >
历史搜索 清空历史
首页> 外文期刊>Journal of Physical Oceanography >Gravity Waves in a Horizontal Shear Flow. Part Ⅱ: Interaction between Gravity Waves and Potential Vorticity Perturbations
【24h】

Gravity Waves in a Horizontal Shear Flow. Part Ⅱ: Interaction between Gravity Waves and Potential Vorticity Perturbations

机译：在水平剪切流中的重力波。第二部分：重力波与潜在涡旋扰动之间的相互作用

获取原文
获取原文并翻译 | 示例
           
页面导航
  • 摘要
  • 著录项
  • 相似文献
  • 相关主题

摘要

Interaction among potential vorticity perturbations and propagating internal gravity waves in a horizontally sheared zonal flow is investigated. In the strong stratification limit, an initial vorticity perturbation weakly excites two propagating gravity waves while the density component of the potential vorticity perturbation is significantly amplified, potentially leading to convective collapse. If stratification is sufficiently weak, a strong coupling between vorticity perturbations and gravity waves is found and spontaneous gravity wave generation occurs. This coupling can be traced to the nonnormal interaction between the potential vorticity and gravity wave manifolds in the weak stratification limit. Vorticity perturbations amplify in energy due to downgradient Reynolds stress when their phase lines tilt against the shear and the large growth attained is transferred to propagating gravity waves. When the flow geometry is such that the excited gravity waves are confined in the vicinity of the vorticity perturbation by their trapping levels, an overall convective collapse of this region can be anticipated. On the other hand, when the flow geometry permits wave propagation, significant gravity wave emission occurs.
机译：研究了水平剪切纬向流中潜在涡旋扰动和内部重力波传播之间的相互作用。在强分层极限中，最初的涡旋扰动会微弱地激发两个传播的重力波，而潜在涡旋扰动的密度分量会大大放大，从而可能导致对流塌陷。如果分层足够弱，则会发现涡旋扰动和重力波之间有很强的耦合，并且会产生自发的重力波。这种耦合可以追溯到弱分层极限中潜在涡度和重力波流形之间的非正常相互作用。当雷诺应力的相线逆着剪切倾斜并且获得的大的增长转移到传播的重力波时，由于雷诺应力降低，涡度扰动会放大能量。当流动的几何形状使得被激发的重力波通过其捕获水平被限制在涡旋扰动附近时，可以预期该区域的整体对流塌陷。另一方面，当流动几何形状允许波传播时，会发生大量的重力波发射。

著录项

相似文献

  • 外文文献
  • 中文文献
  • 专利
获取原文

客服邮箱：kefu@zhangqiaokeyan.com

京公网安备：11010802029741号 ICP备案号：京ICP备15016152号-6 六维联合信息科技 (北京) 有限公司©版权所有

  • 客服微信

  • 服务号