Abstract

The LIDAR-CEFOP Observatory is operating with complementary instrumentation for measuring atmospheric aerosol optical properties, e.g. elastic and Raman Lidar system, sunphotometer, CMAX-DOAS (Concurrent Multi AXis Differential Optical Absorption Spectrometer) and HSI-DOAS (Hemispherical Scanning System - DOAS). The CMAX-DOAS and HSI-DOAS techniques uses the differential absorption structures of the oxygen collision complex (O2-O2 or O4) in the visible wavelength region to derive aerosol information and due to no absolute radiometric calibrations are generally needed; the CMAX-DOAS and HSI-DOASare suitable for conducting long-term automated measurements, providing further information of aerosols and trace gases abundances. In this work, we show the major challengers in the optical design, also different resultsabouttheImagingspectrometerperformance, opticalcharacterization and the air quality measurements will be presented.Thisfamily of instrumentallowsthe quantification of the differential optical absorption from the solar radiation scattered in the sky, produced by the presence of a wide variety of absorbent atmospheric molecules. The diffuse solar radiationspectraare recorded by customized spectrometers, which have narrow absorption bands in the spectral range including wavelengths in UV and VIS, contained within the boundary layer (troposphere and stratosphere). The measurements provide information about the optical density through different thicknesses atmosphere,along columns of air observation angles from the horizon to the zenith. This angular scanning allows the reconstruction of vertical profiles concentration of various trace gases [1], [2].