Twin scanning lidars for accurate measurement of lower tropospheric aerosols by numerical approximation

Gao Fei; Nan Hengshuai; Li Wanwan; Zhu Qingsong; Zhang Rui; Yan Qing; Li Shichun; Wang Li; Hua Dengxin

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Twin scanning lidars for accurate measurement of lower tropospheric aerosols by numerical approximation

机译：双扫描延线，通过数值近似来精确测量较低的对流层气溶胶

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In order to improve accuracy of aerosol measurements, a novel method using twin scanning lidars is presented; this method is able to overcome the incomplete overlap range of vertical lidar as well as provide 2D spatial distributions. The scanning lidar setups in the opposite directions are employed as remote sensing tools. Aerosol measurements are performed with cross scanning from the ground to the height of interest. Aerosol optical properties are retrieved using numerical approximation, in which differences between the measured values and the constructed values of the logarithmic range-square-corrected lidar data in the cross-scanning region are minimized. In the data retrieval, we utilize a matrix formulation, in which a Cartesian 2D range-height-indicator diagram is constructed. To verify this method, scanning measurements by ultraviolet Mie scanning lidar performed at different time intervals were taken as the cross-scanning measurements from the twin scanning lidars. With the retrieved spatial distributions of aerosol optical properties, such as aerosol backscatter, aerosol extinction, and lidar ratio, the regional aerosol studies showed that aerosol loading was relatively small and in the presence of multiple layers, which may be influenced by airflow from long-range transportation and cause a large impact on the local environment. To conclude, the presented method using twin scanning lidars is feasible for aerosol measurement in the application of horizontally atmospheric inhomogeneity. (C) 2018 Optical Society of America

机译：为了提高气溶胶测量的准确性，提出了一种使用双扫描引线的新方法;该方法能够克服垂直激光器的不完全重叠范围，并提供2D空间分布。相反方向上的扫描激光雷达设置用作遥感工具。气溶胶测量以从地面到感兴趣的高度的交叉扫描来执行。使用数值近似检索气溶胶光学性质，其中测量值与跨扫描区域中的对数范围 - 方形校正的LIDAR数据的差异之间的差异被最小化。在数据检索中，我们利用矩阵配方，其中构造了笛卡尔2D范围高度指示图。为了验证该方法，将以不同时间间隔执行的紫外线MIE扫描激光雷达扫描测量作为来自双扫描闪光灯的交叉扫描测量。随着气溶胶光学性质的空间分布，例如气溶胶背散，气溶胶灭火和激光雷达比例，区域气溶胶研究表明，气溶胶载荷相对较小，在多层存在，这可能受到气流的影响 - 范围运输并对当地环境产生很大影响。为了得出结论，使用双扫描引线仪的呈现方法对于气溶胶测量在水平大气不均匀性中的应用是可行的。（c）2018年光学学会

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《Applied optics》 |2018年第12期|共7页
作者
Gao Fei; Nan Hengshuai; Li Wanwan; Zhu Qingsong; Zhang Rui; Yan Qing; Li Shichun; Wang Li; Hua Dengxin;
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Xian Univ Technol Sch Mech &

Precis Instrument Engn Xian 710048 Shaanxi Peoples R China;

Xian Univ Technol Sch Mech &

Precis Instrument Engn Xian 710048 Shaanxi Peoples R China;

Xian Univ Technol Sch Mech &

Precis Instrument Engn Xian 710048 Shaanxi Peoples R China;

Xian Univ Technol Sch Mech &

Precis Instrument Engn Xian 710048 Shaanxi Peoples R China;

Xian Univ Technol Sch Mech &

Precis Instrument Engn Xian 710048 Shaanxi Peoples R China;

Xian Univ Technol Sch Mech &

Precis Instrument Engn Xian 710048 Shaanxi Peoples R China;

Xian Univ Technol Sch Mech &

Precis Instrument Engn Xian 710048 Shaanxi Peoples R China;

Xian Univ Technol Sch Mech &

Precis Instrument Engn Xian 710048 Shaanxi Peoples R China;

Xian Univ Technol Sch Mech &

Precis Instrument Engn Xian 710048 Shaanxi Peoples R China;

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Twin scanning lidars for accurate measurement of lower tropospheric aerosols by numerical approximation

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