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Measurements of Aerosol Optical and Microphysical Properties in Tizi Ouzou

机译：Tizi Ouzou气溶胶光学和微物理性质的测量

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摘要

To characterize the optical behavior of atmospheric particles located above the region of Tizi Ouzou, a micro-LIDAR and a sun/sky-photometer have been used. The analysis of three years of observation has revealed a large variability in the optical properties of the particles present in the atmosphere of this region. The aerosol extinction optical depth (τ) at 500 nm varies from 0.03 to about 2. The Angstrom Exponent (α), in the range 440–870 nm, varies from 0 to 1.8 and is indicating a large variability in size. The combination of micro LIDAR and sun/sky photometer measurements allowed us to determine the vertical profiles of the aerosol extinction coefficient (σext). The vertical profile helps to separate local from transported particles origins. The observation site is located in the city and surrounded by high mountains (2300 m asl). The aerosol optical depth at 500 nm and the Angstrom exponent respectively having the values τ > 0.5 and α < 0.25 indicate the high presence of desert dust particles from Saharan origin. This type of particles is frequently observed for α ranging between 0.25 and 0.35. The analysis of back-trajectories helped to identify the probable origin of air masses affecting the region. Our results show that a routinely operating LIDAR / photometer observing system coupled with back-trajectories analysis is a relevant tool for aerosols monitoring. They show, for the first time, the high temporal variability of aerosols present in the atmosphere of the Tizi Ouzou region.
机译：为了表征位于Tizi Ouzou区域上方的大气粒子的光学行为，已使用微型激光雷达和太阳/天空光度计。三年观察的分析表明，存在于该区域大气中的粒子的光学特性存在很大差异。 500 nm处的气溶胶消光光学深度（τ）从0.03到大约2不等。Angstrom指数（α）在440-870 nm的范围内，从0到1.8不等，并且表明大小存在很大差异。微型激光雷达和太阳/天空光度计测量的结合使我们能够确定气溶胶消光系数（σext）的垂直分布。垂直轮廓有助于将局部颗粒与运输的颗粒起源分开。观察点位于城市中，周围是高山（海拔2300 m）。分别在τ> 0.5和α<0.25时的500 nm气溶胶光学深度和埃指数表明存在着大量来自撒哈拉沙漠的沙漠尘埃颗粒。经常观察到这种类型的粒子的α在0.25到0.35之间。对后向轨迹的分析有助于确定影响该地区的气团的可能起源。我们的结果表明，常规运行的激光雷达/光度计观测系统与反向轨迹分析相结合是用于气溶胶监测的相关工具。它们首次显示了Tizi Ouzou地区大气中存在的气溶胶的高时变性。

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