Wavelet analysis of intermittent turbulent transport in the atmospheric surface layer over a monsoon trough region

摘要: The structure of the turbulence in atmospheric surface layer over a monsoon trough region has been studied using structural analysis based on wavelet transform. observational site is located at eastern (wet) end region, characterized by high moisture layer. On average relative humidity varied from 70% to 100% during experiment. wind and temperature data, collected Kharagpur (22°25' N, 87°18' E) six hours day June 1990 Monsoon Trough Boundary Layer Experiment (MONTBLEX), have utilized study. instantaneous momentum flux time series were decomposed into 12 scales Haar eddies exhibited large temporal variability generating intermittency energy distributions. A criterion isotropy suggested for separating small eddies. At separation scale coefficient drops sharply. It shown that resulted spatial variation energy, deviation velocity statistics Gaussian distribution known as flatness. -5/3 power law attributed increased mean values of, (i) (ii) flatness factor, inertial subrange. decomposition reveals major contribution total arises quadrant shows ejections sweeps account substantial part flux, quantifies importance various contribute transport momentum.