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Since the recognition during the seventies of the importance played by the minor atmospheric compounds in the climate
system (gases and aerosols), the studies regarding the chemistry and dynamical processes of Ozone (O3) and of nitrogen
dioxide (NO2) at high and mid-latitudes, became a fruitful field of research.
This work deals mainly with the retrieval and analysis of O3 and NO2 total columns and vertical profiles over the Evora
Observatory (South of Portugal) for the period 2007-2008. The products presented in this paper are obtained from
spectral measurements carried out with the UV-Vis. Spectrometer for Atmospheric Tracers Monitoring - SPATRAM,
installed at the Observatory of the Geophysics Centre of Evora (CGE) since 2004. The application of the Differential
Optical Absorption Spectroscopy (DOAS) algorithms to the spectral zenith-sky measurements is presented and
discussed. The inversion technique applied to the output of the DOAS procedures (the trace gases content along the
optical path of measurements: the slant column densities -SCD- of the analyzed absorber) are examined. The first
observations obtained with the SPATRAM instrument regarding stratospheric bromine oxide (BrO) are shown. In
addition, the comparison of the ground-based measurements with data derived from satellite equipments (OMI and
SCIAMACHY), are discussed.
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