Articles

Title:	Porewater nutrients (phosphate, ammonia and silicate) in the ekstern part of the southern Baltic Sea
Authors:	Białkowska Izabela Bolałek Jerzy Graca Bożena Witek Zbigniew Burska Dorota Pawelec Andrzej
Abstract:	In the present work, results of studies concerning phosphate, ammonia and silicate in porewaters of the eastern part of the southern Baltic sediments are presented. A strong interaction was observed between the investigated compound concentrations and the sea bottom type, defined by means of the sediment water content (W) and loss on ignition (LOI) values. High concentrations and an exponential increase in concentration downwards in the sediment depth profile was observed in regions named here transport/accumulation bottom (LOI≥4%, W≥50%). Lower concentrations and irregular changes in concentration with depth occurred in regions designated as erosion bottom type (LOI<4, W<50%). Only in areas under strong anthropogenic influence (Vistula river mouth, the vicinity of Gdynia harbour), in the erosion type bottom concentration periodically raised to the level observed in the transport/accumulation bottom areas. The mass of nutrients accumulated in porewaters in the 10 cm thick layer of surface sediments of the Gulf of Gdańsk in September 2000 was estimated to be 910 t P-PO₄^3-, 2780 t N-NH₄⁺ and 5430 t DSi, while in March/April of 2001 estimated values equalled 908 t P-PO₄^3-, 1860 t N-NH₄⁺ and 3080 t DSi. In the erosion bottom areas, approximately 12 t, 210 t and 650 t of P-PO₄^3-, N-NH₄⁺ and DSi, respectively, were flushed out of the sediments during the intensive autumn-winter mixing.
DOI:
Type of paper:	Original research paper
Pages:	237 to 256
Cytation:	Graca B., Witek Z., Burska D., Białkowska I., Pawelec A., Bolałek J., 2006, Porewater nutrients (phosphate, ammonia and silicate) in the ekstern part of the southern Baltic Sea, Ocean. Hydrob. Studies, 35(3): 237-256
Keywords:	nutrients, porewater, sediments, Gdańsk Basin, southern Baltic
Year:	2006
Category:
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