Comparison of Long Term Tropospheric Ozone Trends Measured by Lidar and ECC Ozonesondes from 1991 to 2010 in Southern FranceG. Ancellet, A. Gaudel and S. Godin-BeekmannEPJ Web of Conferences, 119 (2016) 20002DOI: https://doi.org/10.1051/epjconf/201611920002