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Ergodicity of turbulence measurements upon complex terrain in Loess Plateau

Science China Earth Sciences 2021年第1期64卷 37-51页

作者： Jinbei CHEN Xiaowen CHEN Xiaojun JING Wei JIA Ye YU Suping ZHAO Key Laboratory of L and Surface Processes and Climate Change in the Cold and A rid Regions of the Chinese Academy of Sciences Northwest Institute of Eco-Environment and ResourcesCASLanzhou 730000China Penn State College of Engineering Pennsylvania State UniversityCenter 16802USA Taiyuan Meteorological Bureau Taiyuan 030082China

To display the distribution characteristics of turbulence eddy under condition of complex terrain in Loess Plateau,and to enhance the precision of turbulence measurements,the research of turbulence ergodicity is considered to be the prior section of the *** the statistics of single-site turbulence measurements obtained in Baimiao Tableland,Ping Liang,Gan Su,analysis result shows that not only the turbulence with scale less than 10 min,which can easily satisfy the ergodicity,the tableland terrain can also be a major cause of the coherent structure of periodic,large-scale turbulence;compared to which for the turbulence above the flat underlying surface,the distribution of 10–40 min,large-scale turbulence in the tableland region tends to be more steady and,thus,can also satisfy the ergodicity *** the condition of extremely unstable stratification,the wind is comparatively low in speed and features distinctly large-scale,periodical fluctuation,and with the trend of smooth increase in temperature,large-scale wind turbulence and temperature turbulence both tend to satisfy *** comparison,under the condition of extremely stable stratification,the aperiodicity of large-scale wind turbulence and temperature turbulence caused by intermittency is comparatively strong,and the turbulence cannot satisfy ergodicity easily.

关键词： turbulence ergodicity Characteristic of turbulence distribution Atmospheric stratification turbulence spectrum Band-pass filtering

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Multi-site observation of large-scale eddies in the surface layer of the Loess Plateau

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Science China Earth Sciences 2023年第4期66卷 871-881页

作者： Jinbei CHEN Xiaowen CHEN Wei JIA Ye YU Suping ZHAO Key Laboratory of Land Surface Process and Climate Change in Cold and Arid Regions Northwest Institute of Eco-Environment and ResourcesChinese Academy of SciencesLanzhou 730000China Key Laboratory of Middle Atmosphere and Global Environment Observation(LAGEO) Institute of Atmospheric PhysicsChinese Academy of SciencesBeijing 100029China Mechanical Engineering Department Pennsylvania State UniversityState College 16802USA

This article aims to build a theory of atmospheric boundary layer turbulence under complex conditions. To achieve this goal, we constructed a multi-site observation and analysis method of atmospheric turbulence based on related *** method first requires verification for the ergodicity of the full-scale observation of surface-layer turbulence, which proves that eddies within a scale of 60 min during a four-site observation can easily meet ergodicity. Meanwhile, by applying the second-order structure function for the horizontal wind speed turbulence of a single site and upstream and downstream points, we verified the ergodicity of the turbulence observation. Comparing the turbulence spectrum to the second-order structure function for the horizontal wind speed from the four-site observation, a relatively high accordance was observed, proving the reasonability of the multi-site observation. Moreover, compared to the single-site observation, the four-site observation can improve the estimation accuracy of the surface-layer turbulence spectrum and vertical turbulent flux. As a result, we can describe the threedimensional structure of turbulence more accurately and comprehensively by combining analytical data from single-site and four-site observations. In summary, the multi-site turbulence observation method shows that the horizontal and vertical wind turbulence of the Baimiao plateau has a typical structure of a turbulence spectrum with clear spectral gaps. The result is in accordance with the scale of the turbulence spectral gaps obtained from the 6 h data. The horizontal wind speed is under the influence of the terrain, so its spectrum of large-scale eddies has higher fluctuations, but its spectral gaps can still be clearly distinguished. Although the spectral gaps of the temperature spectrum are not distinguishable, they still have the same scale as the spectral gap of the vertical and horizontal turbulence spectrum. Moreover, the temperature spectrum poss

关键词： Larger-scale eddy Complex condition Ergodicity of turbulence observation Structure function turbulence spectrum

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spectrum Analysis of Wind Profiling Radar Measurements

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Journal of Meteorological Research 2014年第4期28卷 656-667页

作者：阮征慕瑞琪魏鸣葛润生 State Key Laboratory of Severe Weather Chinese Academy of Meteorological Sciences Nanjing University of Information Science & Technology

Unlike previous studies on wind turbulence spectrum in the planetary boundary layer, this investigation focuses on high-altitude （1-5 km） wind energy spectrum and turbulence spectrum under various weather conditions. A fast Fourier transform （FFT） is used to calculate the wind energy and turbulence spectrum density at high altitudes （1-5 km） based on wind profiling radar （WPR） measurements. The turbulence spectrum under stable weather conditions at high altitudes is expressed in powers within a frequency range of 2 × 10-5-10-3 s-1, and the slope b is between -0.82 and -1.04, indicating that the turbulence is in the transition from the energetic area to the inertial sub-range. The features of strong weather are reflected less obviously in the wind energy spectrum than in the turbulence spectrum, with peaks showing up at different heights in the latter spectrum. Cold windy weather appears over a period of 1.5 days in the turbulence spectrum. Wide-range rainstorms exhibit two or three peaks in the spectrum over a period of 15-20 h, while in severe convective weather conditions, there are two peaks at 13 and 9 h. The results indicate that spectrum analysis of wind profiling radar measurements can be used as a supplemental and helpful method for weather analysis.

关键词： wind profiling radar wind energy spectrum turbulence spectrum

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SPECTRAL CHARACTERISTICS OF SURFACE-LAYER turbulence OVER THE SUBURBS OF TIANJIN

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Acta meteorologica Sinica 1994年第2期8卷 220-228页

作者： (王存忠) (曹文俊) China Meteorological Press Beijing 100081 Nanjing Institute of Meteorology Nanjing 210044

The paper computed the spectra of velocity and temperature,and the cospectra of velocity and temperature by the observational data of July,1990 in the suburbs of *** results show that the characteristics of the atmospheric turbulence spectra over the suburbs are basically in accordance with some typical results over the flat *** the scale,on which turbulence can satisfy the isotropic condition,over the suburbs is larger than over the flat *** spectrum peak frequency range is a bit *** feature of the spectrum range in low frequency(LF)is out of accordance with that of the flat terrain either.

关键词： atmospheric boundary layer atmospheric turbulence turbulence spectrum

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