Assessment of ozone long-term evolution from 35 years of ozone monitoring by multiple instruments at a Northern Mid-Latitude Station
Résumé
Since the mid-eighties, stratospheric ozone has been monitored at Observatoire de Haute-Provence (OHP - 44°N, 6°E) by a variety of instruments: ozone total column measurements are provided by Dobson and SAOZ spectrometers since respectively 1983 and 1992 while ozone vertical distribution is measured by lidar and ozone sondes instruments as well as Umkehr method since respectively 1985, 1984 and 1983. The study provides extensive comparisons between OHP ozone records and merged gridded satellite measurements obtained in the vicinity of the station. The long-term trend of ozone vertical distribution as well as total and partial stratospheric and tropospheric ozone columns is evaluated from the various observation records and the LOTUS regression model (Godin-Beekmann et al., 2022), using different proxies for the evaluation of short-term variability of ozone. The contribution of the proxies to ozone variability is evaluated as a function of altitude and the coherence of ozone evolution as deduced from the various time series is assessed.