Two ADFs are used during the specific SYN Level-2 section:

• The SYN Level-2 Radiative Transfer Simulation data file provides physical and optical properties of aerosol derived from a set of 40 predefined aerosol mixtures. For each of these models, the ADF provides the Top Of Atmosphere (TOA) reflectance for zero surface reflectance, the atmospheric transmission, the atmospheric bi-hemispherical albedo at 550 nm, the fraction of the diffuse irradiance and the ozone correction factor. This ADF is also used to compute aerosol Angstrom exponent at 550 nm for all aerosol models.


• The SYN L2 CAMS AOD climatology Data file includes a monthly climatology of 550 nm Aerosol Optical Thickness from Copernicus Atmosphere Monitoring Service (CAMS). These files have been created through a reanalysis AOT data over the time period 2003 – 2012. 12 files are available, once per month, and all these files have a spatial resolution of 0.125 x 0.125 degrees. There are provided in ENVI standard format