In spite of algal blooms and dead zones, the overall eutrophication in the Baltic Sea have actually decreased. According to a new study by Swedish, Danish and Finnish researchers, the improvement is the result of long-term measures to reduce nutrient inputs from land.
Wastewater treatment plants are important point sources of chemical pollution in coastal areas of the Baltic Sea. Persistent organic pollutants, nanoparticles and emerging contaminants such as pharmaceuticals are present in the effluents. A recently published study by Finnish, Swedish and French researchers has investigated the biological effects of these effluents on Baltic mussels.
Seabased measures is not an alternative to landbased measures in abating eutrophication in the Baltic Sea. Landbased measures will eventually lead to improvement, not only in the sea but also in lakes and rivers, and are necessary for a sustainable society, leading Baltic Sea researchers state.
Increasing atmospheric concentration of carbon dioxide affects the sea and causes ocean acidification. But many other factors than atmospheric CO2 affect the partial pressure of CO2 in the Baltic Sea, shows a new study with the BALTSEM model.
Organic contaminants constitute one of many stressors that deteriorate the ecological status of the Baltic Sea. The novel modeling tool BALTSEM-POP for organic contaminants also includes other types of stressors and provides many important management applications.
A deep dive into sediment cores from the Baltic Sea shows the recurrence of intensely hypoxic conditions several times during its 8,000 year existence. But the history of hypoxia in the different regions of the Baltic Sea varies greatly, and new research suggests that the uplift of Scandinavia since the last ice age may be the reason.
Baltic Nest Institute is a partner in two of the new projects funded by BONUS that was presented today. Denmark is the leading partner in Go4Baltic and Baltic Nest Institute Sweden is a partner in BalticAPP. The implementation of these projects starts in April 2015.
Baltic Nest researchers have now expanded the BALTSEM model to include carbon isotopes. The isotopic compositions of inorganic and organic carbon species in the Baltic Sea are mainly controlled by phytoplankton production and respiration and the related air-sea CO2 fluxes. This method could also have important applications for estimates of greenhouse gas emissions in other areas.
Alkalinity production in the Baltic Sea is much larger than previously known. Researchers at Stockholm University determined the alkalinity delivered by rivers to the Baltic Sea and concluded that there are large internal sources in the sea that generate alkalinity.
Pollution by organic contaminants and other hazardous chemical substances is one of the major stressors in the Baltic Sea. Now researchers at Baltic Nest Institute have developed a new modeling tool that can predict future distribution of organic chemicals in the Baltic Sea.
Baltic Nest Institute Sweden
Baltic Sea Centre, Stockholm University
SE-106 91 Stockholm, Sweden, +46-8-16 37 18
Baltic Nest Institute Denmark
Aarhus University, Fredriksborgsvej 399
DK-4000 Roskilde, Denmark, +45 4630 1200
Baltic Nest Institute Finland
Finnish Environment Institute, P.O. Box 140
FI-00251 Helsinki, Finland, + 358 20 610 123