• 主题
高级搜索  >
历史搜索 清空历史
首页> 外文期刊>Journal of Physical Oceanography >The Impact of Finite-Amplitude Bottom Topography on Internal Wave Generation in the Southern Ocean
【24h】

The Impact of Finite-Amplitude Bottom Topography on Internal Wave Generation in the Southern Ocean

机译：有限振幅底部地形对南洋内波产生的影响

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

Direct observations in the Southern Ocean report enhanced internal wave activity and turbulence in a kilometer-thick layer above rough bottom topography collocated with the deep-reaching fronts of the Antarctic Circumpolar Current. Linear theory, corrected for finite-amplitude topography based on idealized, two-dimensional numerical simulations, has been recently used to estimate the global distribution of internal wave generation by oceanic currents and eddies. The global estimate shows that the topographic wave generation is a significant sink of energy for geostrophic flows and a source of energy for turbulent mixing in the deep ocean. However, comparison with recent observations from the Diapycnal and Isopycnal Mixing Experiment in the Southern Ocean shows that the linear theory predictions and idealized two-dimensional simulations grossly overestimate the observed levels of turbulent energy dissipation. This study presents two- and three-dimensional, realistic topography simulations of internal lee-wave generation from a steady flow interacting with topography with parameters typical of Drake Passage. The results demonstrate that internal wave generation at three-dimensional, finite bottom topography is reduced compared to the two-dimensional case. The reduction is primarily associated with finite-amplitude bottom topography effects that suppress vertical motions and thus reduce the amplitude of the internal waves radiated from topography. The implication of these results for the global lee-wave generation is discussed.
机译：在南大洋的直接观测表明，在粗糙的底部地形上方一千米厚的层与南极绕极洋流的深部前沿并置的情况下，内部波活动和湍流增强。线性理论已基于理想化的二维数值模拟对有限振幅地形进行了校正，最近已用于估计洋流和涡流产生的内部波的全球分布。全球估算表明，地形波的产生是地转流的重要能量汇，也是深海湍流混合的能量源。但是，与南大洋的双斜和等斜混合实验的最新观察结果相比，线性理论预测和理想化的二维模拟结果严重高估了所观察到的湍流能量耗散水平。这项研究提出了二维的和三维的，真实的地形模拟，这些模拟是内部水波产生的，该水是由稳定流与具有Drake Passage典型参数的地形相互作用而产生的。结果表明，与二维情况相比，在三维有限底部形貌下内部波的产生减少了。减小主要与有限幅度的底部地形效应相关，该效应抑制垂直运动并因此减小了从地形辐射的内部波的振幅。讨论了这些结果对全球风浪产生的影响。

著录项

  • 来源
    《Journal of Physical Oceanography》 |2014年第11期|2938-2950|共13页
  • 作者

    Maxim Nikurashin; Raffaele Ferrari; Nicolas Grisouard; Kurt Polzin;

  • 作者单位

    Institute for Marine and Antarctic Studies, University of Tasmania, Hobart, and ARC Centre of Excellence for Climate System Science, Sydney, New South Wales, Australia,Institute for Marine and Antarctic Studies, University of Tasmania, Private Bag 129, Hobart, TAS 7001, Australia;

    Department of Earth, Atmospheric and Planetary Sciences, Massachusetts Institute of Technology, Cambridge, Massachusetts;

    Department of Environmental Earth System Science, Stanford University, Stanford, California;

    Woods Hole Oceanographic Institution, Woods Hole, Massachusetts;

  • 收录信息
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

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