Seawater transparency estimated by means of the Secchi disc depth depends on all optically active water constituents, among them the chlorophyll a concentration. This parameter is very important for primary production studies, and it might be very useful to investigate its relationship to the water transparency measured in such an easy way. Long-term observations of the chlorophyll a concentration and the associated Secchi disc depth from three stations in the southern Baltic are presented. The data were collected during almost twenty five years (1971-1995). The correlation between these parameters and the influence of chlorophyll a concentrations on the Secchi disc depth are examined.
Simple formula for computing irradiance attenuation in the Gulf of Gdansk waters in a func-tion of chlorophyll a concentration is obtained on the basis of field data. In its derivation, the relationship between Secchi depth and diffuse attenuation coefficient of visible irradiance was applied.
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