Aerosol Optical Properties above Productive Waters of Gorky Reservoir for Atmospheric Correction of Sentinel-3/OLCI Images

The main challenge that one has to face during the atmospheric correction (AC) of productive inland waters is inability correctly separate aerosol radiance from water-leaving in near-infrared range (NIR) bands. This leads both incorrect estimates parameters and remote-sensing reflectance (Rrs). For Gorky Reservoir, where we are developing regional bio-optical models, situation complicated by lack field measurements optical properties due significant remoteness AERONET stations. standard AC algorithms, as shown earlier, greatly overestimated all spectral bands up red period intense cyanobacteria blooms, while algorithm with a fixed depth (AOD) obtained clean water area gave encouraging results. Therefore, it was important investigate characteristics atmosphere above reservoir validate proposed approach for regular use Sentinel-3 imagery Reservoir. To solve these issues, situ using handheld sun photometer SPM were performed. measured AOD Angstrom exponent compared two Sentinel-3/OLCI Level-2 products, namely, Synergy (SYN) Water Full Resolution products (OL_2_WFR). It found 2–3 times almost 2 cases. Atmospheric AOD, defined measurements, allows us completely get rid negative Rrs, its shapes values became typical Despite overestimation traditional large variations general, minimum spectrum close spectrum. spectra, which correspond percentiles distribution, can be used preliminary imaginary. relative errors Rrs retrievals percentile 3–35% green Sentinel-3/OLCI.