CIMEL sunphotometer

PI Vassilis Amiridis
Operator: Panos Raptis
Participant National Observatory of Athens
Instrument picture

Near-real time data are available at AERONET's website.

The CIMEL sunphotometer of ATHENS-NOA AERONET station will be employed during the campaign.

NASA’s AERONET (Holben et al., 1998 - is a global sunphotometric network mainly distributed in North America and Europe. The network employs the Cimel CE318 sunphotometer as the standard instrument. More than 250 units take part in AERONET.

Retrieved aerosol products are column properties for the aerosol optical depth (AOD) at several wavelengths of the solar spectrum (380, 440, 500, 675, 870, 1020 and 1640 nm) and the Ångström exponent at 440/870 nm, the size-distribution and the complex refractive index and single scattering albedo (SSA) at 440, 675, 870 and 1020 nm. The products for size, refractive index and SSA are derived from the sky-radiances at 440, 675, 870 and 1020 nm.


During the CHARADMexp campaign the AERONET measurements will be combined with lidar measurements for retrieving the optical and microphysical aerosol property profiles with GARRLiC algorithm (Lopatin et al. 2013).

The GARRLiC algorithm is initialized in the frame of ACTRIS to utilize the capabilities of combined AERONET/EARLINET stations in Europe. The algorithm retrieves the profiles of aerosol microphysical properties using the sunphotometer measurements of the sky radiance and optical thickness and the multi-wavelength elastic lidar measurements.

In particular, GARRLiC retrieves the size distribution, the spherical particles fraction and the spectral refractive index, considering them constant along the atmospheric column, separately for fine and coarse particles, as well as the concentration profiles of fine and coarse particles.

GARRLiC provides also the absorption coefficient profile which will be compared with the airborne in-situ measurements from aethalometers during the campaign.

Instrument activity

Recent measurements

The campaign is organized and funded through the ACTRIS, the European Research Infrastructure for the observation of Aerosol, Clouds, and Trace gases.