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<p>Reservoirs are sources of the three greenhouse gases (GHG) CO₂, CH₄, and N₂O. We present a simple approach to quantify the three emission pathways surface diffusion, ebullition, and downstream emissions and applied this approach to four German reservoirs of different trophic state. CO₂ dominated emissions across most sites, released via diffusion at the water surface and by downstream emissions. CH₄ emissions were significant only in the highly eutrophic Bautzen Reservoir, where also significant ebullition was observed. Emissions of N₂O were extremely low. Although the rather simple approach comes with considerable uncertainty due to spatial and temporal variability, we could identify two emission types: Nutrient poorer reservoirs represent a “CO₂ type” with minor emissions of CH4, while the highly eutrophic reservoir showed significant CH4 emissions. Each reservoir emitted less than 7 000 t CO₂-eq annually, indicating a minor climate impact. We conclude that GHG emissions from temperate reservoirs are generally low but vary with eutrophication levels. A simplified monitoring strategy is proposed for cost-effective GHG assessment.</p>

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Treibhausgasfreisetzung aus deutschen Talsperren: Mechanismen, Messung und Bewertung

  • 期刊论文

  • 发表日期：

    2026年3月3日

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  • Matthias Koschorreck,
  • Patrick Aurich,
  • Carolin Waldemer,
  • Philipp Keller,
  • Judith Lange,
  • Uwe Spank

摘要

Reservoirs are sources of the three greenhouse gases (GHG) CO₂, CH₄, and N₂O. We present a simple approach to quantify the three emission pathways surface diffusion, ebullition, and downstream emissions and applied this approach to four German reservoirs of different trophic state. CO₂ dominated emissions across most sites, released via diffusion at the water surface and by downstream emissions. CH₄ emissions were significant only in the highly eutrophic Bautzen Reservoir, where also significant ebullition was observed. Emissions of N₂O were extremely low. Although the rather simple approach comes with considerable uncertainty due to spatial and temporal variability, we could identify two emission types: Nutrient poorer reservoirs represent a “CO₂ type” with minor emissions of CH4, while the highly eutrophic reservoir showed significant CH4 emissions. Each reservoir emitted less than 7 000 t CO₂-eq annually, indicating a minor climate impact. We conclude that GHG emissions from temperate reservoirs are generally low but vary with eutrophication levels. A simplified monitoring strategy is proposed for cost-effective GHG assessment.