3 research outputs found
SAWA experiment ? properties of mineral dust aerosol as seen by synergic lidar and sun-photometer measurements
International audienceWe propose a method of retrieving basic information on mineral dust aerosol particles from synergic sun-photometer and multi-wavelength lidar measurements as well as from the observations of lidar light depolarisation. We use this method in a case study of mineral dust episode in Central Europe. Lidar signals are inversed with a modified Klett-Fernald algorithm. Aerosol optical depth measured with the sun-photometer allows to reduce uncertainties in the inversion procedure through which we estimate vertical profile of aerosol extinction. Next we assume that aerosol particles may be represented by ensemble of randomly oriented, identical spheroids. Having calculated vertical profiles of aerosol extinction coefficients for lidar wavelengths, we compute the profiles of local Angstrom exponent. We use laser beam depolarisation together with the calculated Angstrom exponents to estimate the shapes (aspect ratios) and sizes of the spheroids. Numerical calculations are performed with the transition matrix (T-matrix) algorithm by M. Mishchenko. The proposed method was first used during SAWA measurement campaign in Warsaw, spring 2005, to characterise the particles of desert dust, drifting over Poland with a southern-eastern wind (13?14 April). Observations and T-matrix calculations show that mode radii of spheroids representative for desert aerosols' particles are in the range of 0.15?0.3 ?m, while their aspect ratios are lower than 0.7 or larger than 1.7
LIDAR investigation of properties of atmospheric aerosol
In the paper application of lidars for investigation of aerosol particle
size distribution and for observation of aerosol consisting of solid state particles
is presented. For size distribution the multiwavelength lidar and original method of
data analysis was applied. For registration of dust transported to Central Europe
from Sahara and Middle East deserts analysis of depolarization of the backscattered
signals was used. In order to solve the lidar equation measurements of total
atmospheric
optical depth by means of Microtops sun photometer was done. Mean size and the
aspect ratio of dust particles were determined by comparing of lidar observations
with data from T-matrix calculations