Characteristics of Coherent Structures of Atmospheric Turbulence in High Latitude Based on Wavelet Analysis

Abstract

Abstract:

Fluctuation dates of wind speed and temperature are analyzed by using spectral analysis and wavelet analysis. Then the coherent structures of atmospheric turbulence at different heights are obtained. They are used to identify the characteristic scales of coherent structures in time series. They are also used to extract spatial characteristics of coherent structures of atmospheric turbulence in high altitude by combining structural parameters of atmospheric refractive index Cn2, and the spatial characteristics like turbulence intensity and turbulent layer thickness were extracted. It is found that with the change of the height, the turbulence is manifested by the alternation of the strong stratification and the weak stratification. As the height increases, the turbulence duration becomes shorter and the thickness of the turbulent layer becomes smaller. Strong turbulences of small scale exist in weak turbulence of large scale. They have relatively dense distribution, short duration, and small thickness. The high altitude atmospheric turbulence in this measurement is found to have a clear phenomenon of strong or weak stratification in the 5 ~15 km. At the height of 6km-10km, there are four strong turbulence layers, and the thickness of the turbulent layer is about 500 m.

Key words: atmospheric turbulence, fluctuation dates, spectral analysis, wavelet analysis, coherent structures

CLC Number:

TP346
TP347

YANG Ze-Kun, SUN Gang, LIU Qing, LI Xue-Bin, WENG Ning-Quan. Characteristics of Coherent Structures of Atmospheric Turbulence in High Latitude Based on Wavelet Analysis[J]. Journal of Atmospheric and Environmental Optics, 2017, 12(5): 340-348.

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