...
  • 主题
高级搜索  >
历史搜索 清空历史
首页> 外文期刊>Journal of Physical Oceanography >Pathways, Volume Transport, and Mixing of Abyssal Water in the Samoan Passage
【24h】

Pathways, Volume Transport, and Mixing of Abyssal Water in the Samoan Passage

机译：萨摩亚通道中的路径，体积传输和深水混合

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 flow of dense water through the Samoan Passage accounts for the major part of the bottom water renewal in the North Pacific and is thus an important element of the Pacific meridional overturning circulation. A recent set of highly resolved measurements used CTD/LADCP, a microstructure profiler, and moorings to constrain the complex pathways and variability of the abyssal flow. Volume transport estimates for the dense northward current at several sections across the passage, calculated using direct velocity measurements from LADCPs, range from 3.9x10(6) to 6.0 x 10(6) +/- 1 x 10(6) m(3) s(-1). The deep channel to the east and shallower pathways to the west carried about equal amounts of this volume transport, with the densest water flowing along the main eastern channel. Turbulent dissipation rates estimated from Thorpe scales and direct microstructure agree to within a factor of 2 and provide a region-averaged value of O(10(-8)) Wkg(-1) for layers colder than 0.8 degrees C. Associated diapycnal diffusivities and downward turbulent heat fluxes are about 5 x 10(-3) m(2) s(-1) and O(10) Wm(-2), respectively. However, heat budgets suggest heat fluxes 2-6 times greater. In the vicinity of one of the major sills of the passage, highly resolved Thorpe-inferred diffusivity and heat flux were over 10 times larger than the region-averaged values, suggesting the mismatch is likely due to undersampled mixing hotspots.
机译：通过萨摩亚通道的稠密水流是北太平洋底部水更新的主要部分，因此是太平洋子午翻转环流的重要组成部分。最近的一组高度解析的测量结果使用CTD / LADCP，微结构轮廓仪和系泊设备来限制深海流的复杂路径和可变性。使用来自LADCP的直接速度测量值计算出的整个通道中几个区域的密集北向电流的体积输运估计值，范围从3.9x10（6）到6.0 x 10（6）+/- 1 x 10（6）m（3） s（-1）。东部的较深河道和西部的较浅河道进行了这种体积的运输，其中最密集的水沿主要的东部河道流动。根据Thorpe尺度和直接显微结构估算的湍流耗散率在2的因数内，并且为低于0.8摄氏度的层提供了O（10（-8））Wkg（-1）的区域平均值。向下的湍流热通量分别约为5 x 10（-3）m（2）s（-1）和O（10）Wm（-2）。但是，热量预算表明热通量要大2-6倍。在通道的主要门槛之一附近，高分辨的索普推导的扩散率和热通量比区域平均值大10倍以上，这表明不匹配可能是由于采样不足的混合热点所致。

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