塔克拉玛干沙漠北缘夏季典型晴天近地层湍流能谱特征

doi:10.7522/j.issn.1000-694X.2018.00132

摘要/Abstract

摘要： 利用塔克拉玛干沙漠北缘肖塘地区涡动相关系统三维方向风速（u，v，w）、气温、CO₂、H₂O等观测数据，分析了夏季典型晴天不同大气稳定度条件下湍流功率谱和协谱。结果表明：大部分情况下湍流速度谱分布满足-2/3幂指数率，垂直方向高频段惯性副区符合程度更高，水平方向次之；CO₂和H₂O浓度则符合程度较低；温度谱与无因次频率总体上都具有很好的相关性。垂直风速与径向风速u的协谱斜率拟合值大多数情况下更接近-1，而在近中性层结条件下更符合-4/5斜线。稳定层结条件下的协谱峰值比不稳定层结时更大，且约大一个量级；不稳定层结条件下高频段协谱近直线型下降。u谱对应的谱峰波长随稳定度增加而减小，v谱和T谱对应的谱峰波长随稳定度的增加没有规律性增减；u、v、w、T谱谱峰波长约67~827、69~2417、4~54、12~661 m。

关键词: 湍流能谱, 涡动相关, 塔克拉玛干沙漠, 绿洲-沙漠过渡带

Abstract: By using three-dimensional wind speed (u, v, w), air temperature, CO₂, H₂O and other observation data from eddy covariance system in Xiaotang over the northern marginal zone of the Taklimakan Desert, this paper deal with the power spectra and cospectrum of turbulence under different atmospheric stability on typical sunny days in summer. The distribution of turbulent velocity mostly fitted the -2/3 power exponential rate well in Xiaotang, and the vertical high-frequency segment of inertia sub-region more significantly fitted the -2/3 power exponential rate, and then the horizontal direction. The fitting levels of CO₂ and H₂O were lower. The temperature spectrum has a good correlation with the dimensionless frequency in general. The cospectrum slope fitting values of vertical wind speed and radial wind speed u were large and were closer to -1 in most cases, and were more consistent with -4/5 slashes in the near neutral conditions. The cospectrum peak was larger under stable than that at unstable and it was about one magnitude larger. The cospectrum of high frequency segment decreased almost linearly under unstable conditions. The values of the peak wavelengths corresponding to the u spectrum decreased with the increase of stability, and the values of the peak wavelengths corresponding to the v spectrum and the T spectrum does not increased or decreased regularly with the increase of stability. The values of the peak wavelengths of u, v, w, T were about 67-827, 69-2417, 4-54,12-661 m, respectively.

Key words: turbulent spectra, eddy covariance, Taklimakan Desert, oasis-desert transition zone

中图分类号:

P422.4

金莉莉, 李振杰, 何清, 买买提艾力·买买提依明, 霍文, 张建涛. 塔克拉玛干沙漠北缘夏季典型晴天近地层湍流能谱特征[J]. 中国沙漠, 2019, 39(6): 1-12.

Jin Lili, Li Zhenjie, He Qing, Ali Mamtimin, Huo Wen, Zhang Jiantao. Characteristic of Surface-Layer Turbulence Spectra on Typical Sunny Days over the Northern Marginal Zone of the Taklimakan Desert[J]. Journal of Desert Research, 2019, 39(6): 1-12.

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