Temporal and spatial variations in particle concentrations and size distributions in the Gulf of Gdansk
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Measurements of suspended particle (diameter in the 4-30 mum range) concentrations and their sizes (using a Multisizer II Coulter Counter) carried out in the Gulf of Gdansk from May 1992 to December 1993 were used for studies of the temporal and spatial variability of particle size distributions. The quantity of suspended particles in Puck Bay waters was characteristically less variable both in the vertical and in the horizontal than was the open Gulf of Gdansk, which is influenced to some extent by the waters of the river Vistula. In Puck Bay, surface particle concentrations were usually in the range 1.6?103-1.0?104 cm-3, in the open Gulf of Gdansk they were 1.6?103-2.0?104 cm-3. The Vistula strongly influenced the concentration of larger particles and the shape of the particle size distribution curves just off the river mouth. The particle size distribution curves characteristic of the Gulf of Gdansk display, in general, the hyperbolic shape typical of marine suspensions. In waters with a relatively high concentration of particles, some additional increase in particle number in the diameter range of 10-20 ?m or just below 10 mum was recorded. During the year, three periods of maximum particle concentrations occurred. Two of them, in spring and autumn, were found to be related to maximum chlorophyll a concentrations. The best correlation between particle numbers and chlorophyll a content was found for particles with diameter D more than 10 mum for two classes of suspensions: with high (r=0.88) and low (r=0.82) particle concentrations occurring in the presence of the same chlorophyll a concentration.
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K.Brandke, University of Gdansk, Institute of Oceanography Al. Marszalka Pilsudskiego 46, 81-378 Gdynia, Poland