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The hydrological and hydrochemical division of the surface waters in the Gulf of Gdańsk

Nowacki J., Jarosz E.

Oceanologia

1998

No. 40 (3)

261-272

The objective of this work was to define regions in the surface layer of the Gulf of Gdansk that are characterised by different natural (temperature, salinity, total water depth) and anthropogenic (concentrations of major nutrients) factors. Additionally, approximate boundaries between the regions distinguished were delineated. To find regions of different hydrological and hydrochemical properties, Ward's method, an agglomerative hierarchical cluster technique, was applied to a data set containing measurements of temperature, salinity, total depths and nutrient concentrations. Cluster analysis divided the surface waters of the Gulf of Gdansk into seven regions. The surface waters in the shallow water part of the Gulf of Gdansk, where six out of the seven regions were located, displayed a distinct diversity which was probably associated with the morphometry of the Gulf, nutrient sources and freshwater input. The last region encompassed the deep-water part of the Gulf of Gdansk and Puck Bay.