Atmospheric aerosols measurements: optical data interpretation
|Lead Author||Alexander, Yegorov|
|Institution Contact||Russian State Hydrometeorological University, 195196, St.Petersburg, Malookhtinsky pr., 98, Russia|
|Co-Authors||Irene Potapova, Russian State Hydrometeorological University Julia Rzhonsnitskaya, Russian State Hydrometeorological University Nadezhda Sanotskaya, Russian State Hydrometeorological University|
|Theme||Theme 1: Vulnerability of Arctic Environments|
|Session Name||1.1 Climate Change and Environmental Management in the Arctic|
|Abstract text||This paper discusses the problem of the reliability with which the characteristics of atmospheric aerosols are determined from the results of lidar and photoelectric measurements. The scientific and practical significance of lidar information concerning the characteristics of arctic aerosols is known. At the same time, it is a difficult problem to develop methods of lidar probing of the atmosphere. The purpose of this paper is to discuss new lidar equation solutions developed for weak signal processing and the results of the analysis of the effectiveness of these solutions. The accuracy of interpreting weak backscattering signals can be improved using the effective beam-path averaging procedure and the linear approximation of the transmittance in the case of small extinction coefficient.
The results of photoelectric measurements essentially depend on the optical properties of aerosol particles. The solution of the electromagnetic field differential equations was analyzed to propose new model of a spherical particle with the radially variable refractive index. The experimental data were used for this model development. The developed model was used to minimize the error of particle size optical determination. New technical solutions were proposed for the development of the aerosol particles spectrometer using polarized light.