A Case Study on Observed and Simulated CO2 Concentration Profiles in Hefei based on Raman Lidar and GEOS-Chem ModelYinan Wang, Daren Lü, Weilin Pan and Kee YuanEPJ Web of Conferences, 119 (2016) 05019DOI: https://doi.org/10.1051/epjconf/201611905019