Aerosol Lidar Intercomparison in the Framework of the MEMO Project. 1. Lidar Self Calibration and 1 st Comparison Observation Calibration Based on Statistical Analysis Method

With the rapid socioeconomic development of China, mega-cities with a population of more than 10 million have gradually emerged, with frequent urban floods and atmospheric pollution as well as other disasters. For better weather forecast and disaster prevention and mitigation in mega-cities, in 2016, China Meteorological Administration organized the " MegaCity Experiment On Integrated Meteorological Observation in China (MEMO)", in which continuous and quantitative observation of aerosol profiles in mega-cities by aerosol lidar is one of the important parts. To ensure the quantitative comparability of the aerosol lidar data, the Meteorological Observation Center of China Meteorological Administration launched the first calibration experiment of aerosol lidar network in MEMO at the Beijing Southern Suburb Observatory in September 2017. 6 lidars participated in the calibration and statistical analysis was used for the calibration of key subsystems such as transmit/receive channel, data acquisition. After calibration, the relative standard deviation of backscattering coefficient in 532nm channel is reduced from 90.8% to 20.4% in height range of 1-2 km, and from 244.3% to 35.9% in height range of 2-5 km.