Case Analysis of Turbulence From High-Resolution Sounding Data in Northwest China

Case Analysis of Turbulence From High-Resolution Sounding Data in Northwest China
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西北地区高分辨率探空资料湍流实例分析

DOI:
10.3389/fenvs.2022.839685
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发表时间:
2022-01
影响因子:
4.6
通讯作者:
He Y et al
He Y et al
中科院分区:
环境科学与生态学3区
文献类型:
--
作者:
Qin Z;Sheng Z;He Y et al

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利用中国西北部的一组近空间高分辨率探空资料,利用索普方法计算了索普尺度、湍流层厚度、湍动能耗散率和湍流扩散系数,并对平流层中部大尺度湍流层进行了个例分析。结果表明,在对流层中上层到对流层顶区附近,湍流层最多,占总湍流的44.0%,最大的Thorpe尺度和最大的湍流层厚度也出现在该高度范围内。此外,受对流层顶附近大尺度湍流的影响,计算的湍流能量耗散率和扩散系数在该高度也有极大值,分别为0.003m2s−3和6.94m2s−1。通过对气象要素的分析,发现降水与平流层大尺度湍流有明显的相关关系。当降水发生时,对应的两套探空仪在平流层中部探测到较大尺度的湍流层。
This study calculated the Thorpe scale, thickness of turbulent layer, turbulent kinetic energy dissipation rate, and turbulent diffusion coefficient based on the Thorpe method using a set of near-space high-resolution radiosonde data in northwest China, and a case study was conducted to analyze the large-scale turbulent layer in the middle stratosphere. The results showed that the most turbulent layers exist near from the middle and upper troposphere to the tropopause region, accounting for 44.0% of the total turbulence, and the largest Thorpe scale and thickness of turbulent layer also appear in this altitude range. In addition, affected by the large-scale turbulence near the tropopause, the calculated turbulent energy dissipation rate and diffusion coefficient also have maximum values at this altitude, which are 0.003m2s−3 and 6.94m2s−1, respectively. By analyzing the meteorological elements, it is found that there is an obvious correlation between precipitation and large-scale turbulence in the stratosphere. When the precipitation occurs, the corresponding two sets of radiosondes detected larger-scale turbulence layers in the middle stratosphere.
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