Long-term trends in Swiss rivers sampled continuously over 39 years reflect changes in geochemical processes and pollution

  • Juerg Zobrist
  • Ursula Schoenenberger
  • Simon Figura
  • Stephan J. Hug
Research Article

Abstract

Long-term changes of 14 water constituents measured in continuously and water discharge proportionally collected samples of four Swiss rivers over a period of 39 years are analyzed using several statistical techniques. Possible drivers and causes for the identified trends and shifts are explained by consideration of catchment characteristics and anthropogenic activities. Water temperatures increased by 0.8–1.3 °C, whereas water discharges remained largely unchanged. Concentrations of alkalinity, total hardness, Ca, and Mg regulated by dominant carbonate lithologies in catchments increased by up to 10%. We attribute this change to an increase in the partial pressure of CO2 in the subsurface, provoked by increasing temperatures. Re-oligotrophication processes in lakes also influence the behavior of alkalinity and silicic acid. In contrast to concentrations, most loads did not change significantly, due to their large variances. Therefore, no changes in overall weathering rates of carbonate rocks can be detected. The outgassing of CO2 in rivers from the place of carbonate dissolution to measurement stations amounts up to 6% (mean) of CO2 sequestered (mean 1.1 mol m−2 a−1) by the weathering of rock minerals. Changes in alkalinity/Ca/Mg ratios indicate an increase in calcite precipitation over time. Total nitrogen concentrations and loads peaked at the end of the 1980s and then decreased up to 50%, while NO3 concentrations showed almost no changes. This dynamic matches the changes in the agricultural N balance. Concentrations and loads of Na and Cl increased up to 60% due to an increase in the various uses of rock salt.

Keywords

River Long-term trends Geochemical processes Nitrogen pollution Switzerland 

Notes

Acknowledgments

We gratefully acknowledge the constant effort of numerous collaborators at the “Federal Hydrological Survey” (official name changed many times), at the analytical laboratory and in the data-handling group at Eawag, who have reliably and continuously carried out the long-term river survey NADUF for more than 40 years. We also thank David Livingstone, Rolf Kipfer, and Laura Sigg for their valuable comments and support. The suggestion and comments of two anonymous reviewers are also highly appreciated. Lastly, we are grateful to Jay Matta for improving the English writing.

Supplementary material

11356_2018_1679_MOESM1_ESM.pdf (1.4 mb)
ESM 1 (PDF 1.35 mb)
11356_2018_1679_MOESM2_ESM.pdf (195 kb)
ESM 2 (PDF 194 kb)

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Copyright information

© Springer-Verlag GmbH Germany, part of Springer Nature 2018

Authors and Affiliations

  1. 1.Eawag, Swiss Federal Institute of Aquatic Science and Technology (Eawag)DübendorfSwitzerland
  2. 2.UsterSwitzerland
  3. 3.ZürichSwitzerland

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