Comparison and Analysis of Aerosol Lidar Network in Mega City of Beijing Using Real Lidar

Abstract

In 2016, the China Meteorological Administration organized the “Megacity Experiment on integrated Meteorological Observation in China” to realize the continuous quantitative observation of aerosol profiles in megacities by using aerosol lidar. In order to ensure the quantitative comparability of the observed data of aerosol lidar, in September 2017, the CMA Meteorological Observation Centre carried out the first megacity experiment in the South suburb Observatory of Beijing. In the calibration test of aerosol lidar, the hardware system calibration of six lidars and the calibration of 2km-5km are completed by using the method of statistical analysis. This is the second aerosol calibration test of the Megacity Experiment in 2018. For the first time, the standard aerosol lidar developed by the University of Naples in Europe is introduced as the standard source, and 10 lidars from different manufacturers participating in the joint test are calibrated and compared at the same site at the same time. The results show that: REAL LIDAR as a reference source is equivalent to the calibration results using statistical methods. In the future, REAL LIDAR can be used as a standard to calibrate other lidar by means of quantum transfer. In this paper, the system deviation and standard deviation of backscatter coefficient of 1-8 km are obtained, and the results meet the calibration requirements of European EARLINET. This work promotes the improvement of the data quality of aerosol lidar, ensures the reliability and consistency of the data when multiple lidar network observation, and provides the basis for lidar to enter the real-time business NET.