The Variability of Parameters Controlling the Cyanobacteria Bloom Biomass in the Baltic Sea

The formation of wintertime excess of dissolved inorganic phosphorus concentration (eDIP) in the surface layer and its influence to the late-summer diazotrophic cyanobacteria development have been evaluated on the base of 30 years nutrients and river runoff monitoring data in different Baltic Sea sub-basins, relatively short satellite chlorophyll a (Chl a) and modelled upper mixed layer depth (UMLD) data. The processes responsible for the formation of the surface and bottom phosphate concentration pools in winter, the exchange processes between the pools and the amount of phosphate transported from the bottom pool to the surface are not fully understood. We did not find any significant correlation between the wintertime bottom layer (BL) DIP and upper mixed layer (UML) DIP for the deeper Baltic Sea sub-basins. Instead, we found a significant correlation between UML DIP and UMLD in winter. With the present considerable trend of decrease of the dissolved inorganic nitrogen concentration (DIN) in the Baltic Proper mainly the DIP variability determines the excess phosphate, which is regarded as the main phosphate source for the late summer cyanobacterial blooms in the

LILOVER Madis-Jaak;  STIPS Adolf; 

2009-01-29

ELSEVIER SCIENCE BV

JRC44411

0924-7963,   

http://www.sciencedirect.com/,    http://dx.doi.org/10.1016/j.jmarsys.2008.03.029,    https://publications.jrc.ec.europa.eu/repository/handle/JRC44411,   

10.1016/j.jmarsys.2008.03.029,