Statistical Analysis of the Surface Layer Atmosphere Refractive Index Structure Parameter in Chengdu

Abstract

Abstract:

The refractive index structure parameter Cn² from April to May in 2014 measured by the temperature pulsating instrument and sonic anemometers in Chengdu was statistically analyzed. The results of Cn² measured by two methods agree well with each other both in day and at night. Compared with Hefei, the diurnal variation of the Cn2 is obvious but conversion time is different. Between 10^-15 and 10^-13 level, Cn² frequencies measured by the temperature pulsating instrument and sonic anemometers are 74.05% and 84.40% respectively; the frequencies less than 10^-15 are 24.07% and 10.63% respectively; the frequencies greater than 10^-13 are 1.89% and 4.97% respectively. The relationship of Cn² measured by sonic anemometers and temperature pulsating instrument is y=-8.5694*10^-16+0.6250x, the correlation coefficient is 99.24%, and the possible causes of the Cn² deviation measured by two methods was analyzed in brief.

Key words: atmospheric turbulence, refractive index structure parameter, sonic anemometers, temperature pulsating instrument, laser transmission

CLC Number:

P427.1

QING Chun, WANG Hai-Tao, WANG Ping, WU Xiao-Qing. Statistical Analysis of the Surface Layer Atmosphere Refractive Index Structure Parameter in Chengdu[J]. Journal of Atmospheric and Environmental Optics, 2015, 10(5): 368-375.

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