Lidar Observation of Mesospheric Clouds Above Beijing: A Case Study Shaohua Gong, Guotao Yang, Jihong Wang, Yuchang Xun, Foju Wu, Qinzeng Li, Xiao Liu, Chunxia Chen and Dawei Tian EPJ Web Conf., 237 (2020) 04003 Published online: 07 July 2020 DOI: 10.1051/epjconf/202023704003