...
  • 主题
高级搜索  >
历史搜索 清空历史
首页> 外文期刊>Journal of Physical Oceanography >Influence of Stokes Drift Decay Scale on Langmuir Turbulence
【24h】

Influence of Stokes Drift Decay Scale on Langmuir Turbulence

机译：斯托克斯漂移衰减量表对朗缪尔湍流的影响

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

Accurately scaling Langmuir turbulence (LT) in the ocean surface boundary layer (OSBL) is critical for improving ocean, weather, and climate models. The physical processes by which the structure of LT depends on surface waves' Stokes drift decay length scale are examined. An idealized model for OSBL turbulent kinetic energy (TKE) provides a conceptual framework with three physical processes: TKE transport, dissipation, and production by the Craik-Leibovich (CL) vortex force (VF) associated with the Stokes drift shear. TKE profiles depend on OSBL depth h, surface roughness length z(0), and wavenumber k through the nondimensional parameters kh and kz(0). These parameters determine the rate and length scale for the dissipation of TKE produced by the CL-VF. For kz0 1, TKE input by the CL-VF is governed by a surface flux with TKE rapidly decaying with depth. Only for kz(0) < 1 can TKE penetrate deeper into the OSBL, with the TKE penetration depth controlled by kh. Turbulence-resolving large-eddy simulation results support this conceptual framework and indicate that the dominant Langmuir cell size scales with (kh)(-1). Within the depth of dominant Langmuir cells, TKE dissipation is approximately balanced by CL-VF production. Shorter waves contribute less to deeper vertical velocity variance < w(2)> because the CL-VF is less effective in generating larger-scale LT. Depth-averaged < w(2)> scales with a modified Langmuir number La-phi = (u(*)/ us(phi))(1/ 2), where u(*) denotes the water-side surface friction velocity and usf is a depth-integrated weighted Stokes drift shear or, equivalently, a spectrally filtered surface Stokes drift.
机译：在海洋表面边界层（OSBL）中准确缩放Langmuir湍流（LT）对于改善海洋，天气和气候模型至关重要。研究了LT结构取决于表面波的Stokes漂移衰减长度尺度的物理过程。 OSBL湍流动能（TKE）的理想模型提供了一个包含三个物理过程的概念框架：TKE的运输，耗散以及与斯托克斯漂移剪切相关的Craik-Leibovich（CL）涡流力（VF）的产生。 TKE轮廓取决于OSBL深度h，表面粗糙度长度z（0）和通过无量纲参数kh和kz（0）的波数k。这些参数确定了CL-VF产生的TKE耗散的速率和长度标度。对于kz0 1，CL-VF输入的TKE受表面通量控制，其中TKE随着深度迅速衰减。仅当kz（0）<1时，TKE才能更深地渗透到OSBL中，而TKE的渗透深度由kh控制。解决湍流的大涡模拟结果支持此概念框架，并表明占主导地位的Langmuir细胞大小与（kh）（-1）成比例。在主要的朗缪尔细胞深度内，TKE耗散与CL-VF产生大致平衡。较短的波对较深的垂直速度方差的贡献较小，这是因为CL-VF在生成较大的LT方面不太有效。深度平均具有经修正的朗缪尔数La-phi =（u（*）/ us（phi））（1/2）的比例，其中u（*）表示水侧表面摩擦速度， usf是深度积分加权的斯托克斯漂移剪切或等效地，是经光谱滤波的表面斯托克斯漂移。

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