Abstract. Simultaneous observations of a polarized Micro-Pulse Lidar (P-MPL) system, currently operative within MPLNET (NASA Micro-Pulse Lidar Network), with two referenced EARLINET (European Aerosol Research Lidar Network) lidars, running at Leipzig site (Germany, 51.4º N 12.4º E, 125 m a.s.l.), were performed during a comprehensive two-month field campaign in summer 2019. A calibration assessment regarding the overlap (OVP) correction of the P-MPL signal profiles and its impact in the retrieval of the optical properties is achieved, describing also the experimental procedure used. The optimal lidar-specific OVP function for correcting the P-MPL measurements is experimentally determined, highlighting that the OVP function as delivered by the P-MPL manufacturer cannot be used. Among the OVP functions examined, the averaged one between those obtained from the comparison of the P-MPL observations with those of the other two referenced lidars seems to be the best proxy at both near- and far-field ranges. In addition, the impact of the OVP function in the accuracy of the retrieved profiles of the total particle backscatter coefficient (PBC) and the particle linear depolarization ratio (PLDR) is examined. First, the volume linear depolarization ratio (VLDR) profile is obtained and compared to the reference lidars, showing it needs to be corrected by a small offset value within a good accuracy. Once P-MPL measurements are optimally OVP-corrected, the PBC profiles (and hence the PLDR ones) can be derived using the Klett-Fernald approach. In addition, an alternative method based on the separation of the total PBC into their aerosol components is presented in order to estimate the total particle extinction coefficient (PEC) profile, and hence the Aerosol Optical Depth, from elastic P-MPL measurements. A dust event as observed at Leipzig in June 2019 is used for illustration. In overall, an adequate OVP function is needed to be determined in a regular basis to calibrate the P-MPL system in order to derive suitable aerosol products.

中文翻译：

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与EARLINET激光雷达测量相比较的MPLNET /微脉冲激光雷达系统的实验校准评估，以获取气溶胶光学特性

摘要。同时观测极化微脉冲激光雷达（P-MPL）系统，该系统目前在MPLNET（NASA微脉冲激光雷达网络）内运行，同时有两个参考的EARLINET（欧洲气溶胶研究激光雷达网络）激光雷达在莱比锡站点（德国，51.4）运行在2019年夏季进行的为期两个月的全面野外活动中，进行了北纬12.4度（东经125 m升）的校准评估。校准评估涉及P-MPL信号剖面的重叠（OVP）校正及其对取回P-MPL信号的影响。实现了光学性质，还描述了所使用的实验程序。实验确定了用于校正P-MPL测量值的最佳激光雷达专用OVP功能，强调不能使用P-MPL制造商提供的OVP功能。在检查的OVP功能中，从P-MPL观测结果与其他两个参考激光雷达的观测结果之间比较得出的平均值，似乎是近场和远场范围的最佳替代。此外，检查了OVP函数对总粒子反向散射系数（PBC）和粒子线性去极化比（PLDR）的检索轮廓精度的影响。首先，获得了体积线性去极化比（VLDR）曲线，并将其与参考激光雷达进行比较，表明需要在良好的精度内通过小的偏移值对其进行校正。一旦对P-MPL测量值进行了最佳OVP校正，就可以使用Klett-Fernald方法得出PBC配置文件（以及PLDR配置文件）。此外，提出了一种基于将总PBC分离为其气溶胶成分的替代方法，以便根据弹性P-MPL测量值估算总颗粒消光系数（PEC）曲线，从而估算气溶胶光学深度。以2019年6月在莱比锡观察到的一次尘埃事件为例。总体而言，需要定期确定适当的OVP功能以校准P-MPL系统，以得出合适的气雾剂产品。