Automatic sun/sky/lunar photometer Cimel 318T model: it is equipped with the 9 spectral filters selecting radiation at the following central wavelengths : 340, 380, 440, 500, 675, 870, 937, 1020, 1640 nm.

The state-of-the-art photometric measurement techniques and associated retrieval techniques provide aerosol properties both directly (e.g. daytime and night time spectral extinction AOD and daytime downward sky angular, spectral and polarized radiance) and indirectly (size distribution, refractive indexes, single scattering albedo, spherical fraction, scattering properties (Dubovik et al., 2000, 2014).

The system is part of the AERONET network. AERONET observations are considered as reference observations for climatological investigation, satellite validation and model evaluation studies and are widely used for assessing climate change and air quality management actions (e.g. IPCC report 2021).

A previous version of CIMEL sun-photometer is used as backup in order to avoid observational gap we would have during the calibration process (once per year) executed at AERONET Europe calibration center in Lille.

https://aeronet.gsfc.nasa.gov/cgi-bin/data_display_aod_v3?site=IMAA_Potenza