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Implementation of European marine policy: New water quality targets for German Baltic waters

Author

Listed:
  • Schernewski, Gerald
  • Friedland, Rene
  • Carstens, Marina
  • Hirt, Ulrike
  • Leujak, Wera
  • Nausch, Günther
  • Neumann, Thomas
  • Petenati, Thorkild
  • Sagert, Sigrid
  • Wasmund, Norbert
  • Weber, Mario von

Abstract

A full re-calculation of Water Framework Directive reference and target concentrations for German coastal waters and the western Baltic Sea is presented, which includes a harmonization with HELCOM Baltic Sea Action Plan (BSAP) targets. Further, maximum allowable nutrient inputs (MAI) and target concentrations in rivers for the German Baltic catchments are suggested. For this purpose a spatially coupled, large scale and integrative modeling approach is used, which links the river basin flux model MONERIS to ERGOM-MOM, a three-dimensional ecosystem model of the Baltic Sea. The years around 1880 are considered as reference conditions reflecting a high ecological status and are reconstructed and simulated with the model system. Alternative approaches are briefly described, as well. For every WFD water body and the open sea, target concentrations for nitrogen and phosphorus compounds as well as chlorophyll a are provided by adding 50% to the reference concentrations. In general, the targets are less strict for coastal waters and slightly stricter for the sea (e.g. 1.2mg/m³ chl.a summer average for the Bay of Mecklenburg), compared to current values. By taking into account the specifics of every water body, this approach overcomes the inconsistencies of earlier approaches. Our targets are well in agreement with the BSAP targets, but provide spatially refined and extended results. The full data are presented in Appendix A1 and A2.

Suggested Citation

  • Schernewski, Gerald & Friedland, Rene & Carstens, Marina & Hirt, Ulrike & Leujak, Wera & Nausch, Günther & Neumann, Thomas & Petenati, Thorkild & Sagert, Sigrid & Wasmund, Norbert & Weber, Mario von, 2015. "Implementation of European marine policy: New water quality targets for German Baltic waters," Marine Policy, Elsevier, vol. 51(C), pages 305-321.
    • Handle: RePEc:eee:marpol:v:51:y:2015:i:c:p:305-321
    DOI: 10.1016/j.marpol.2014.09.002
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    1. Maar, Marie & Møller, Eva Friis & Larsen, Jesper & Madsen, Kristine Skovgaard & Wan, Zhenwen & She, Jun & Jonasson, Lars & Neumann, Thomas, 2011. "Ecosystem modelling across a salinity gradient from the North Sea to the Baltic Sea," Ecological Modelling, Elsevier, vol. 222(10), pages 1696-1711.
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    Cited by:

    1. Miguel Inácio & Gerald Schernewski & Dimitra Alkisti Pliatsika & Juliane Benz & René Friedland, 2019. "Assessing Changes in Ecosystem Services Provision in Coastal Waters," Sustainability, MDPI, vol. 11(9), pages 1-21, May.

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