Ozone Seasonal Variation with Ground- Based and Satellite Equipments at Évora Observatory: Portugal During 2007–2010

Abstract

The present study deals with the retrieval and analysis of O3 total columns over the Évora Observatory (South of Portugal) for the period 2007– 2010. The data-set presented in this paper is derived from spectral measurements carried out with the UV–Vis. Spectrometer for Atmospheric Tracers Measurements— SPATRAM, installed at the Observatory of the Geophysics Centre of Évora (CGE) –Portugal (38.58N; 7.9 8W, 300 m asl). The results obtained applying Differential Optical Absorption Spectroscopy (DOAS) methodology to the SPATRAM measurements of zenith sky scattered radiation are presented in terms of seasonal variations of O3. The O3 retrieved with SPATRAM instrument confirms the typical seasonal cycle for middle latitudes reaching the maximum during the spring and the minimum during the autumn. The ground-based results obtained for O3 column are also compared with data from Ozone Monitoring Instrument (OMI) instrument onboard Aura Satellite.