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首页> 外文期刊>Applied optics >Particle backscatter, extinction, and lidar ratio profiling with Raman lidar in south and north China
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Particle backscatter, extinction, and lidar ratio profiling with Raman lidar in south and north China

机译：中国南部和北部使用拉曼激光雷达的粒子反向散射，消光和激光雷达比率分布图

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摘要

Aerosol Raman lidar observations of profiles of the particle extinction and backscatter coefficients and therespective extinction-to-backscatter ratio (lidar ratio) were performed under highly polluted conditions in the Pearl River Delta (PRD) in southern China in October 2004 and at Beijing during a clear period with moderately polluted to background aerosol conditions in January 2005. The anthropogenic haze in the PRD is characterized by volume light-extinction coefficients of particles ranging from approximately 200 to 800 Mm~(-1) and lidar ratios mostly between 40 and 55 sr (average of 47 +- 6 sr). Almost clean air masses were observed throughout the measurements of the Beijing campaign. These air masses originated from arid desert-steppe-like regions (greater Gobi area). Extinction values usually varied between 100 and 300 Mm~(-1), and the lidar ratios were considerably lower (compared with PRD values) with values mostly from 30 to 45 sr (average of 38 +- 7 sr). Gobi dust partly influenced the observations. Unexpectedly low lidar ratios of approximately 25 sr were found for a case of background aerosol with a low optical depth of 0.05. The low lidar ratios are consistent with Mie-scattering calculations applied to ground-based observations of particle size distributions.
机译：气溶胶拉曼激光雷达观测了2004年10月在珠江三角洲（PRD）和北京在2004年10月的高污染条件下对粒子消光和后向散射系数的分布以及相应的消光后向散射比（激光比）进行的观测。 2005年1月是一个晴朗的时期，受到背景气溶胶条件的中度污染。珠三角的人为雾霾的特征在于，颗粒的体积消光系数范围从大约200到800 Mm〜（-1），激光雷达比率主要在40到55 sr之间（平均47±6 sr）。在北京竞选期间，几乎观察到了干净的空气团。这些气团来自干旱的沙漠草原状地区（戈壁地区）。消光值通常在100至300 Mm〜（-1）之间变化，并且激光雷达比（与PRD值相比）要低得多，大多数值在30到45 sr（平均38±7 sr）之间。戈壁的粉尘部分影响了观测结果。对于背景光学气溶胶的光学深度为0.05的情况，发现激光雷达的出乎意料的低比率约为25 sr。低激光雷达比与应用于基于地面的粒度分布观测的米氏散射计算一致。

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