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UBA-Eutro: The Baltic Sea Action Plan - Modelling of Water Quality Indicators

01.10.2020 - 31.03.2023
Project manager:
Prof. Dr. habil. Gerald Schernewski
UBA - Umweltbundesamt
Associated Institution:

Model simulations with the spatio-temporal highly resolved 3D ecosystem model ERGOM-MOM are utilized to evaluate existing nutrient reduction targets for the western Baltic Sea (BSAP/MSFD); assess if further reductions are necessary; analyse if existing reduction targets waters allow additional aquaculture and if yes, where and to what extent; analyse the influence of the Oder river plume on the eutrophication assessments of the Bornholm basin and assess the spatial extent, duration and variability of hypoxic areas within the western Baltic Sea. Based on the results, an approach to integrate model simulations and field data into a new spatio-temporal resolved monitoring and reporting system for the indicators nutrients, chlorophyll-a and oxygen depletion is developed. 


  • D. van Denderen, A. Törnroos, M. Sciberras, H. Hinz, R. Friedland, R. Lasota, M. C. Mangano, C. M. Robertson, S. Valanko, J. G. Hiddink (2022). Effects of bottom trawling and hypoxia on benthic invertebrate communities. Marine Ecology Progress Series 694: 13-27, 10.3354/meps14094
  • Pärn, O., R. Friedland, J. Rjazin, A. Stips (2021). Regime shift in sea-ice characteristics and impact on the spring bloom in the Baltic Sea. Oceanologia : ,
  • Lenhart, H., A. Blauw, X. Desmit, L. Fernand, R. Friedland, B. Heyden, O. Kerimoglu, G. Lacroix, A. van der Linden, J. van der Molen, M. Plus, T. Prins, I. S. Ruvalcaba Baroni, T., C. Stegert, D. Thewes, T. Troost, L. Vilmin and S. van Leeuwen (2021). ICG-EMO report on model comparison for historical scenarios as basis to derive new threshold values. OSPAR Convention for the Protection of the Marine Environment of the North-East Atlantic Intersessional Correspondence Group for Eutrophication Modelling (ICG-EMO). 69 S.
  • Friedland R, Piehl S, Schernewski G, Neumann T: Proposal of a methodology for setting new threshold values for Pomeranian Bay and Bornholm Basin HELCOM meeting document IN-EUTROPHICATION 21-2021 Code: 4-2 Category: DEC Agenda Item: 4– Splitting assessment units Submission date: 18.8.2021 Submitted by: Germany Reference: Friedland et al. (in prep.)
  • Piehl S, Friedland R, Neumann T, Schernewski G: Supporting the HELCOM shallow-water oxygen indicator with modelling products for the Western Baltic Sea HELCOM meeting document - IN-EUTROPHICATION 21-2021 Code: 2-1 Category: DEC Agenda Item: 2– Shallow water oxygen indicator Submission date: 16.8.2021 Submitted by: Germany
  • Grizzetti, B., O. Vigiak, A. Udias, A. Aloe, M. Zanni, F. Bouraoui, A. Pistocchi, C. Dorati, R. Friedland, A. De Roo, C. Benitez Sanz, A. Leip and M. Bielza (2021). How EU policies could reduce nutrient pollution in European inland and coastal waters. Global Environmental Change 69: 102281, doi: 10.1016/j.gloenvcha.2021.102281
  • Stegert, C., H. J. Lenhart, A. Blauw, R. Friedland, W. Leujak, O. Kerimoglu, C. Stegert, H.-J. Lenhart, A. Blauw, R. Friedland, W. Leujak and O. Kerimoglu (2021). Evaluating uncertainties in reconstructing the pre-eutrophic state of the north sea. Front. Mar. Sci. 8: 637483, doi: 10.3389/fmars.2021.637483