Effects of Swell Waves on Atmospheric Boundary Layer Turbulence: A Low Wind Field Study
Effects of Swell Waves on Atmospheric Boundary Layer Turbulence: A Low Wind Field Study
复制标题
涌浪对大气边界层湍流的影响：低风场研究
DOI：
10.1029/2019jc015153
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发表时间：
2019
影响因子：
3.6
通讯作者：
Li Shuiqing
中科院分区：
文献类型：
--
作者：
Zou Zhongshui;Song Jinbao;Li Peiliang;Huang Jian;Zhang Jun A.;Wan Zhanhong;Li Shuiqing
利用来自南海固定平台的数据探讨了低风下涌浪对大气边界层湍流的影响。在平均海面以上8 m高度处测量的风谱、余谱和Ogive曲线提供了风应力受涌浪影响的直接证据。为了解释这种现象，基于总风应力是湍流应力和波浪相干应力的矢量和这一事实，提出了一种改进的方法。与早期研究的方法不同，我们的方法没有将湍流应力与平均风速联系起来。使用我们的方法分析了涌浪对总风应力的大小和方向的影响。结果表明，根据我们的数据得出的波浪相干应力占总风应力的 32%。涌浪改变的风应力的大小和角度取决于湍流应力与涌浪方向之间的相对角度。
The effect of swell waves on atmospheric boundary layer turbulence under low winds was explored using data from a fixed platform located in the South China Sea. The wind spectra, cospectra, and Ogive curve measured at a height of 8 m above the mean sea surface provided direct evidence that wind stress was affected by swell waves. To interpret such phenomena, an improved approach was derived based on the fact that the total wind stress was the vector sum of turbulent stress and wave‐coherent stress. Different from the approaches of earlier studies, our approach did not align the turbulent stress with the mean wind speed. The influence of swell waves on the magnitude and direction of the total wind stress was analyzed using our approach. The results showed that the wave‐coherent stress derived from our data accounted for 32% of the total wind stress. The magnitude and angle of the wind stress changed by swell waves depended on the relative angle between the turbulent stress and swell direction.