利用风廓线雷达谱宽反演晴空湍流耗散率
Retrieval of clear-air turbulent dissipation rate using spectral width measured by wind profiler
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摘要: 从晴天风廓线雷达的回波信号机制出发，研究了利用风廓线雷达谱宽反演晴空湍流耗散率的方法，即从雷达测量的多普勒速度谱宽中提取出湍流因素引起的谱宽，进而由湍流谱宽和湍流动能耗散率的关系计算出湍流动能耗散率。通过对合肥地区风廓线雷达谱宽资料的分析，得到合肥上空300 m高度上湍流动能耗散率的大小分布在10-4~10-1 m2/s3之间，与理论相符，说明利用雷达谱宽反演湍流耗散率的方法可行。Abstract: From the formation mechanism of the wind profiler radar’s echoes, this paper studied a retrieval method of the turbulent kinetic energy dissipation rate from spectral width measured by a wind profiler. Two key steps of the method are extracting spectral width contributed by turbulence and calculating turbulent dissipation rate based on the relation between turbulent dissipation rate and turbulent spectral width. The paper also analyzed the data of spectral width measured by wind profiler in Hefei and the result is that the turbulent kinetic energy dissipation rate over Hefei at the height of 300 m distributes between 10-4 and 10-1 m2/s3. The result accords with theory, so the retrieval method is viable.
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Key words:
- optical turbulence /
- dissipation rate /
- spectral width /
- turbulent kinetic energy /
- wind profiler radar
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