Case studies on phytoplankton blooms in coastal and open waters of the Baltic Sea using Coastal Zone Color Scanner data
Coastal Zone Color Scanner (CZCS) data were used to investigate phytoplankton blooms in the coastal zone and the open Baltic Sea in comparison to shipborne measurements and model calculations. An inverse modelling technique was applied in addition to colour ratio algorithms to separate different water constituents in coastal waters. The temporal and spatial development of the spring bloom and of cyanobacteria in summer show chlorophyll distribution patterns that depend on winddriven dynamical processes and the content of nutrients in the intermediate water layer. During the cyanobacteria bloom in summer, a validation of satellite-derived concentration is difficult because of the patchiness and sampling problems. In areas of river discharge strong variations in the concentration and composition of water constituents occur. The influence of variations in the specific absorption coefficients of phytoplankton on the results of the inverse modelling technique and other algorithms is discussed.
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