Simultaneous scanning lidar measurement and air sampling using a personal cascade impactor for traffic aerosol characterization

College

College of Science

Department/Unit

Physics

Document Type

Conference Proceeding

Source Title

33rd Asian Conference on Remote Sensing 2012, ACRS 2012

Volume

3

First Page

2496

Last Page

2501

Publication Date

12-1-2012

Abstract

Simultaneous vertical scanning lidar measurement and air sampling using a personal cascade impactor was presented in this paper. The fine particulate matters collected using the personal cascade impactor were characterized for their morphology and elemental composition using a scanning electron microscopy coupled with energy dispersive X-ray spectroscopy (SEM-EDX). The scanning Lidar provided a two-dimensional profile of the traffic aerosol showing the spatial distribution of the aerosol horizontally and vertically as indicated by the strong backscattering signal. SEM image showed that the particles collected from the sampling site were irregularly shaped particles. Elemental analysis showed the presence of C and O, in all particles are with traces of Ca, Si, Cu, V, Zn, Sb, Fe, Mg, K, Ba, Co, Cl, Sn, Ni, and Br. Most of these elements are typically associated with anthropogenic emissions such as traffic and combustion of fossil fuels. The study showed that a combined Lidar and air sampling with SEM-EDX analysis can give a better understanding of the characteristics of aerosols such as its spatial distribution, shape, morphology, and chemical composition, and possibly the source.

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