Eutrophication Status Report of the North Sea, Skagerrak, Kattegat and the Baltic Sea: A model study Years 2001-2005

Typ: Rapport
Serie: Oceanografi 110
Författare: K. Eilola1, J. Hansen4, H.E.M. Meier1, K. Myrberg5, V.A. Ryabchenko3 and M.D. Skogen2 1 Swedish Meteorological and Hydrological Institute, Sweden 2 Institute of Marine Research, Norway 3 St. Petersburg Branch, P.P.Shirshov Institute of Oceanology, Russia 4 National Environmental Research Institute, Aarhus University, Denmark 5 Finnish Environment Institute, Finland Nordic


This joint status report for the North Sea, Skagerrak, Kattegat and the Baltic Sea area is carried out by SMHI Sweden, IMR Norway, NERI Denmark, SPBIO Russia, and SYKE Finland as a part of the project “A Baltic and NORth sea Model eutrophication Assessment in a future cLimate” (ABNORMAL), supported by the Nordic Council of Ministers’ Sea and Air Group (NMR-HLG). The previous NMR-HLG projects NO COMMENTS and BANSAI focused on the establishment and main-tenance of operational models and the use of these to develop methods for assessing the eutrophication status. Within ABNORMAL the issues are brought forward with a focus also on the use of ecological models for an assessment of marine eutrophication in a future climate. The main finding of this study is the proposed way of combining observations and results from an ensemble of ecological models to make an assessment of the eutrophication status in present climate for five different years (2001-2005). Threshold values and methodology from the Oslo and Paris Commissions (OSPAR) and the Helsinki Commission (HELCOM) are used and possible improvements of the methods are briefly discussed. The assessment of eutrophication status according to the integration of the categorized assessment parameters indicates that the Kattegat, the Danish Straits, the Gulf of Finland, the Gotland Basin as well as main parts of the Arkona Basin, the Bornholm Basin, and the Baltic proper may be classified as problem areas. The main part of the North Sea and also the Skagerrak are non-problem areas while the main parts of the Gulf of Bothnia, Gulf of Riga and the entire southeastern continental coast of the North Sea may be classified as potential problem areas.