Analysis of Statistical Characteristics of Atmospheric Turbulence Spectra over Urban Surface in a Hailstorm

Abstract

Abstract:

The turbulent data obtained at the Hefei 35 m meteorological tower from 28, Feb, 2012 to 1, March, 2012 have been analyzed. Turbulence spectra, local isotropy and normalized standard deviation of velocity are analyzed with the stability. A hail process happened during the experiment. Results show that inertial sub-range is corresponding to dimensionless frequency which ranges from 0.02 to 2; the inertial sub-range and the turbulent spectral isotropy vary with stable condition; that the inertial sub-range is smaller under stable condition than under unstable condition; the normalized standard deviation of vertical velocity obeys the well-known 1/3 law under stable and unstable condition, and the value of the dimensionless variance of vertical velocity is 1.12 near neutral condition; wind speed, momentum flux and heat flux changed dramatically before and after the hail; and strong convection occurred during this process.

Key words: turbulence spectra, local isotropy, normalized standard deviation, turbulence flux

CLC Number:

P425.2

XIANG Wen-Jie, WU Xiao-Qing. Analysis of Statistical Characteristics of Atmospheric Turbulence Spectra over Urban Surface in a Hailstorm[J]. Journal of Atmospheric and Environmental Optics, 2013, 8(2): 107-113.

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