The plan for the summer season of 2021 was to cover several environments in the Danube Delta and the coastal area of the Black Sea – lagoons, lakes, channels, river mouths, in order to capture the variability of optical properties and in-water parameters.
Three field campaigns took place, one in the Razelm-Sinoe lagoon and two in the Sulina and Sfantu Gheorghe discharging areas, including the Musura and Sahalin lagoons and the Red Lake.
The team did continuous radiometric measurements, using the SO-Rad system, measured the physico-chemical parameters of water and water clarity and filtered water samples in the laboratory onboard the RV ISTROS for total and inorganic suspended matter, clorophyll-a, phycocyanin, particulate absorption and colored dissolved organic matter. Meteorological parameters were measured in the same time with radiometric measurements and water sampling.
Top left: Chlorophyll a samples. Top right: Filtering water samples for total and inorganic suspended matter. Bottom left: The So-Rad system at work in the Razelm-Sinoe lagoon. Bottom right: A channel in the Danube Delta. Photographs by Adriana Constantinescu.