Lidar studies of fluctuation spectra of the coefficient of backscattering in atmospheric surface layer

摘要

Abstract: In this paper we present experimental data of studies of fluctuation spectra of the backscattering coefficient by the synchronous registration of three components of wind velocity, temperature and backscattering coefficient in the local air volume at height equal to 5 meter. Measurements were carried out by means of the acoustic meteostation and with the aerosol laser locator. Obtained results had verified differences between of power auto-spectra of wind velocity fluctuations and backscattering coefficient fluctuations at stable thermal stratification, presumably explained away as the effects of temperature stratification and of convective turbulence. When stratification of the surface layer is stable there appears a 'sub- area of buoyancy' (the Boljiano-Monin spectrum) in fluctuation spectra of the coefficient of backscattering. Assuming that the field of concentration of particles is formed at upper boundary of the boundary layer, and then it without substantial changes it delivers by downgoing flows to the earth surface. !19