Backscattering linear depolarization ratio measurements of mineral, sea-salt, and ammonium sulfate particles simulated in a laboratory chamber

Abstract

The backscattering linear depolarization ratios of major types of tropospheric aerosol particles (Asian and Saharan mineral dust, sea salt, and ammonium sulfate) were measured using a laboratory chamber for interpreting the polarization lidar measurement of tropospheric aerosols. The values obtained from Asian and Saharan mineral particles were $0.39\pm 0.04$ to 0.05 ($\text{mean}\pm \text{standard}$ deviation) for a high number of concentrations in the supermicrometer range and $0.17\pm 0.03$ to $0.14\pm 0.03$ in the submicrometer range. The values were $0.08\pm 0.01$ for sea-salt crystals, $0.04\pm 0.003$ for ammonium sulfate crystals, and $0.01\pm \le 0.001$ for both liquid droplets in the submicrometer range. These values can serve as a reference for estimating aerosol type using lidar measurement.

© 2010 Optical Society of America

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