Eutrophication in Swedish Seas

In 2005 Donald Boesch participated in a group of five experts to evaluate the role of nitrogen and phosphorus in the eutrophication of seas around Sweden. The final report was released in March 2006.

Questions for the Assessment

Do reductions of nitrogen discharges to the Sea lead to reduced eutrophication problems in the sea?

Are there indications of improvements in the recipients where nitrogen discharges have been substantially reduced?

Does reduced nitrogen discharges lead to increasing problems with blue-green algal blooms?

Shall we abandone the present strategy with focus on nitrogen reduction and concentrate on phosphorus in the future?

Are there differences between the Baltic Sea and the Kattegat/Skagerrak area?

Are there differences between coastal and offshore areas?

Some key publications:

Lannergren and Eriksson. 2005. Undersokningar i Stockholms skargard 2004 (recent, thorough report on the Stockholm Archipelago) (pdf, 9.7mb)
Appendix: 2004 data (pdf, 0.5 mb)
Appendix: plankton (0.4 mb)
Appendix: bottom fauna (0.5 mb)

Axe et al. 2005. SMHI report on the Skagerrak coast.(pdf, 14 mb)

Paerl, et al. 2004. Solving problems resulting from solutions: Evolution of a dual nutrient management strategy for the eutrophying Neuse River estuary, North Carolina (pdf, 448kb)

Willander and Persson. 2001. Recovery from eutrophication: experiences of reduced phosphorus input to the four largest lakes of Sweden. (pdf, 442kb)

Data:

Lake Malaren outflow and STP nutrient loads by month (2004) and over time (xls, 46 kb)

Stockholm Vatten archipelago P and N monitoring data (xls, 2.8 mb)

Effluent oxygen demand data (xls, 47 kb)

P profiles at Tralhavet (pdf)

Other inputs:

Christer Lannergren. Response to questions about oxygen consumption and phosphorus and
nitrogen. (pdf, 2.5mb)
Christer Lannergren. Response to questions about P importation and loading (pdf, 341 kb)