• 主题
高级搜索  >
历史搜索 清空历史
首页> 外文期刊>Journal of Physical Oceanography >Topographic Enhancement of Eddy Efficiency in Baroclinic Equilibration
【24h】

Topographic Enhancement of Eddy Efficiency in Baroclinic Equilibration

机译：斜压平衡中涡流效率的地形增强

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

The processes that determine the depth of the Southern Ocean thermocline are considered. In existing conceptual frameworks, the thermocline depth is determined by competition between the mean and eddy heat transport, with a contribution from the interaction with the stratification in the enclosed portion of the ocean. Using numerical simulations, this study examines the equilibration of an idealized circumpolar current with and without topography. The authors find that eddies are much more efficient when topography is present, leading to a shallower thermocline than in the flat case. A simple quasigeostrophic analytical model shows that the topographically induced standing wave increases the effective eddy diffusivity by increasing the local buoyancy gradients and lengthening the buoyancy contours across which the eddies transport heat. In addition to this local heat flux intensification, transient eddy heat fluxes are suppressed away from the topography, especially upstream, indicating that localized topography leads to local (absolute) baroclinic instability and its subsequent finite-amplitude equilibration, which extracts available potential energy very efficiently from.the time-mean flow.
机译：考虑了确定南大洋热跃层深度的过程。在现有的概念框架中，温跃层的深度是由均值和涡流传热之间的竞争来决定的，这是由于与海洋封闭层中的分层相互作用而产生的。使用数值模拟，这项研究检查了有形和无形的理想化的圆极性电流的平衡。作者发现，当存在地形时，涡流的效率要高得多，从而导致比平坦情况下的跃层更浅。一个简单的准营养分析模型表明，地形诱发的驻波通过增加局部浮力梯度并延长涡流传热的浮力轮廓来增加有效涡流扩散率。除了这种局部热通量增强之外，瞬态涡流热通量还被抑制在远离形貌的位置，特别是在上游，这表明局部形貌会导致局部（绝对）斜压不稳定及其随后的有限振幅平衡，从而非常有效地提取了可用的势能。时间平均流量

著录项

  • 来源
    《Journal of Physical Oceanography》 |2014年第8期|2107-2126|共20页
  • 作者

    Ryan Abernathey; Paola Cessi;

  • 作者单位

    Columbia University, New York, New York ,Columbia University, Lamont-Doherty Earth Observatory, 205C Oceanography, 61 Route 9W, P.O. Box 1000, Palisades, NY 10964-8000;

    Scripps Institution of Oceanography, La Jolla, California;

  • 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