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Hans Estrup Andersen

The future depends on what we do today - Projecting Europe's surface water quality into three different future scenarios

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  • Leoni Mack, University of Duisburg-Essen, Germany
  • Hans Estrup Andersen
  • Meryem Beklioğlu, Limnology Laboratory, Department of Biology, Middle East Technical University, Ankara, Orta Dogu Teknik Universitesi, Turkey
  • Tuba Bucak, Middle E Tech Univ, Orta Dogu Teknik University, Dept Biol, Limnol Lab, Orta Dogu Teknik Universitesi, Middle East Tech Univ, Dept Biol Sci, Limnol Lab, Turkey
  • Raoul-Marie Couture
  • ,
  • Fabien Cremona, Estonian Univ Life Sci, Estonian University of Life Sciences, Inst Agr & Environm Sci, Ctr Limnol
  • ,
  • Maria Teresa Ferreira, Portugal
  • Michael G. Hutchins, Centre for Ecology and Hydrology, Wallingford
  • ,
  • Ute Mischke
  • ,
  • Eugenio Molina Navarro
  • Katri Rankinen
  • ,
  • Markus Venohr, Denmark
  • Sebastian Birk, University of Duisburg-Essen, Germany

There are infinite possible future scenarios reflecting the impacts of anthropogenic multiple stress on our planet. These impacts include changes in climate and land cover, to which aquatic ecosystems are especially vulnerable. To assess plausible developments of the future state of European surface waters, we considered two climate scenarios and three storylines describing land use, management and anthropogenic development (‘Consensus’ ‘Techno’ and ‘Fragmented’ which in terms of environmental protection represent best-, intermediate- and worst-case, respectively). Three lake and four river basins were selected, representing a spectrum of European conditions through a range of different human impacts and climatic, geographical and biological characteristics. Using process-based and empirical models, freshwater total nitrogen, total phosphorus and chlorophyll-a concentrations were projected for 2030 and 2060. Under current conditions, the water bodies mostly fail good ecological status. In future predictions for the Techno and Fragmented World, concentrations further increased, while concentrations generally declined for the Consensus World. Furthermore, impacts were more severe for rivers than for lakes. Main pressures identified were nutrient inputs from agriculture, land use change, inadequately managed water abstractions and climate change effects. While the basins in the Continental and Atlantic regions were primarily affected by land use changes, in the Mediterranean/Anatolian the main driver was climate change. The Boreal basins showed combined impacts of land use and climate change and clearly reflected the climate-induced future trend of agricultural activities shifting northward. The storylines showed positive effects on ecological status by classical mitigation measures in the Consensus World (e.g. riparian shading), technical improvements in the Techno World (e.g. increasing wastewater treatment efficiency) and agricultural extensification in the Fragmented World. Results emphasize the need for implementing targeted measures to reduce anthropogenic impacts and the importance of having differing levels of ambition for improving the future status of water bodies depending on the societal future to be expected.

Original languageEnglish
JournalScience of the Total Environment
Volume668
IssueJune
Pages (from-to)470-484
Number of pages15
ISSN0048-9697
DOIs
Publication statusPublished - 2019

    Research areas

  • Chlorophyll-a, Climate change, Land use change, Multiple stressors, Storylines, Total nitrogen, Total phosphorus, Water quality modeling

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