...
  • 主题
高级搜索  >
历史搜索 清空历史
首页> 外文期刊>Ocean Dynamics >Enhanced turbulent mixing induced by strong wind on the South China Sea shelf
【24h】

Enhanced turbulent mixing induced by strong wind on the South China Sea shelf

机译：南海陆架强风引起的湍流混合增强

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

Integrated observations were made on the South China Sea shelf at 19°37' N, 112°04' E, under strong wind and heavy raining weather conditions in August 2005. Current data were obtained using a moored 150-kHz Acoustic Doppler Current Profiler, turbulent kinetic energy dissipation rate were measured with TurboMapII, and temperature was recorded by thermistor chains. Both the mixed layer thickness and the corresponding mean dissipation rate increased after the strong wind bursts. Average surface mixed layer thickness was 13.4 m pre-wind and 22.4 m post-wind, and the average turbulent dissipation rate in the mixed layer pre-wind and post-wind were 4.26 × 10~(-7) and 1.09 × 10~(-6) Wkg~(-1) respectively. The post-wind dissipation rate was 2.5 times larger than the pre-wind dissipation rate in the interior layer and four times larger in the intermediate water column. Spectra and vertical mode analysis revealed that near-inertial motion post-wind, especially with high modes, was strengthened and propagated downward toward the intermediate layer. The downward group velocity of near-inertial current was about 8.1 × 10~(-5) ms~(-1) during the strong wind bursts. The mean percentage of wind work transmitted into the intermediate layer is about 4.2 %. The ratio of post-wind high-mode energy to total horizontal kinetic energy increased below the surface mixed layer, which would have caused instabilities and result in turbulent mixing. Based on these data, we discuss a previous parameterization that relates dissipation rate, stratification, and shear variance calculated from baroclinic currents with high modes (higher than mode 1) which concentrate a large fraction of energy.
机译：2005年8月，在强风和大雨天气条件下，在南海19°37'N，112°04'E的南海陆架上进行了综合观测。使用系泊的150 kHz声学多普勒电流剖面仪获得了当前数据，用TurboMapII测量湍流动能耗散率，并通过热敏电阻链记录温度。强风爆发后，混合层厚度和相应的平均耗散率均增加。平均表面混合层厚度在卷取前为13.4 m，在卷取后为22.4 m，混合层在卷取前后的平均湍流耗散率为4.26×10〜（-7）和1.09×10〜（ -6）Wkg〜（-1）。后风的耗散率在内层比风前的耗散率大2.5倍，在中间水柱中大四倍。光谱和垂直模态分析表明，近惯性运动后风，尤其是高模态后风得到加强，并向下传播至中间层。强风爆发时，近惯性电流的向下群速度约为8.1×10〜（-5）ms〜（-1）。传输到中间层的风功的平均百分比约为4.2％。风后高模能量与总水平动能之比在表面混合层以下增加，这将导致不稳定并导致湍流混合。基于这些数据，我们讨论先前的参数化，该参数化涉及从高模式（高于模式1）的斜压电流计算出的耗散率，分层和剪切方差，该模式集中了很大一部分能量。

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