Current browning of surface waters will be further promoted by wetter climate
Creators
- 1. Norwegian Institute for Water Research (NIVA), Gaustadalléen 21, 0349 Oslo, Norway
- 2. Department of Ecology and Genetics/Limnology, Uppsala University, Norbyvägen 18D, 752 36 Uppsala, Sweden
- 3. Department of Aquatic Sciences and Assessment, Swedish University of Agricultural Sciences, Lennart Hjälms väg 9, 750 07 Uppsala, Sweden
- 4. Finnish Environment Institute, P.O. Box 140, 00251 Helsinki, Finland
- 5. Section for Aquatic Biology and Toxicology, Department of Biosciences, University of Oslo, 0316 Oslo, Norway
- 6. Department of Forest Ecology and Management, Swedish University of Agricultural Sciences, 901 83 Umeå, Sweden
Description
Browning of surface waters because of increasing terrestrial dissolved organic carbon (OC) concentrations is a concern for drinking water providers and can impact land carbon storage. We show that positive trends in OC in 474 streams, lakes, and rivers in boreal and subarctic ecosystems in Norway, Sweden, and Finland between 1990 and 2013 are surprisingly constant across climatic gradients and catchment sizes, implying that water bodies across the entire landscape are browning. We estimate that a 10% increase in precipitation will increase mobilization of OC from soils to freshwaters by at least 30%, demonstrating the importance of climate wetting for the carbon cycle. We conclude that upon future increases in precipitation, current browning trends will continue across the entire aquatic continuum, requiring expensive adaptations in drinking water plants, increasing land to sea export of carbon, and impacting aquatic productivity and greenhouse gas emissions.
Files
Weyhenmeyer_EnvSciTechn_16.pdf
Files
(2.8 MB)
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