Articles

Title:	Primary production and chlorophyll a concentration during upwelling events along the Hel Peninsula (the Baltic Sea)
Authors:	Szymelfenig Maria Zalewski Mariusz Ameryk Anetta
Abstract:	The measurements of chlorophyll a concentration and primary production were carried out during seven upwelling events along the northern seaside of the Hel Peninsula (the southern Baltic Sea) between April 2000 and August 2002. Daily primary production was estimated by simulated in situ method. The maximum rates of phytoplankton photosynthesis derived from photosynthetic light curves were used for calculations. The values of chlorophyll a concentration and primary production depended directly on the level and distribution of phytoplankton biomass. The lowest chlorophyll a concentration and primary production were found in the upwelling centre and increased with the distance from its centre towards the reference area. Gradients of chlorophyll a concentration and primary production varied with the changes in upwelling intensity and the season of the year. In autumn the differences between the upwelling centre and the reference area were significantly smaller than in spring and summer. In spring and summer chlorophyll a concentration and primary production showed 20-fold and 7-fold increase, respectively, as compared to the results obtained in autumn. High values of assimilation numbers were found in the upwelling centre, what indicates favourable conditions for phytoplankton development. Therefore, it could be suggested that optimum thermal, light and trophic conditions enhance primary production at a certain distance from the upwelling centre and during upwelling relaxation.
DOI:
Type of paper:	Original research paper
Pages:	97 to 113
Cytation:	Zalewski M., Ameryk A., Szymelfenig M., 2005, Primary production and chlorophyll a concentration during upwelling events along the Peninsula (the Baltic Sea), Ocean. Hydrob. Studies, 34(Supl. 2): 97-113
Keywords:	coastal upwelling, Baltic Sea, chlorophyll a
Year:	2005
Category:
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