Water chemical changes along a latitudinal gradient in relation to climate and atmospheric deposition
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Evaluating trends over time (nonparametric Mann–Kendall test) for 18 water chemical variables from 79 reference lakes, distributed all over Sweden, during spring since 1984 showed most significant trends for atmospheric deposition driven sulfate (SO4) concentrations. The decrease in SO4 concentrations was on average 2.7 times higher at lower (56°N to 59°N) than at higher latitudes (60°N to 68°N). This large difference in the rate of change between lower and higher latitudes could not solely be explained by atmospheric deposition as the rates of change in SO4 wet deposition differed by a factor of only 1.5 between lower and higher latitudes. Significantly higher rates of change at lower than at higher latitudes are known from the timing of lake ice breakup, a typical climate change indicator. The rates of change in the timing of lake ice breakup differed by a factor of 2.3 between lower and higher latitudes. Other water chemical variables showing significantly higher rates of change at lower than at higher latitudes were water color (a factor of 3.5), calcium (a factor of 2.9), magnesium (a factor of 5.5) and conductivity (a factor of 5.9). The rates of change of all these variables were strongly related to the rates of change in the timing of lake ice breakup along a latitudinal gradient (R 2 = 0.41–0.78, p < 0.05), suggesting that climatic changes can accelerate atmospheric driven changes at especially lower latitudes. This acceleration will result in more heterogeneous lake ecosystems along a latitudinal gradient.
KeywordsCond Atmospheric Deposition North Atlantic Oscillation Latitudinal Gradient Water Color
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- Barica J, Mathias JA (1979) Oxygen depletion and winterkill risk in small prairie lakes under extended ice cover. J Fish Res Board Can 36:980–986Google Scholar
- Carpenter SR (2003) Regime shifts in lake ecosystems: pattern and variation. International Ecology Institute, Oldendorf/LuheGoogle Scholar
- Dokulil MT, Teubner K (2002) The spatial coherence of alpine lakes. Verhandlungen der Internationalen Vereinigung für Limnologie 28:1861–1864Google Scholar
- Fransson S (1965) The borderland. Acta Phytogeogr Suec 50:167–173Google Scholar
- Gerten D, Adrian R (2002) Effects of climate warming, North Atlantic Oscillation, and El Nino–Southern Oscillation on thermal conditions and plankton dynamics in Northern Hemispheric lakes. Sci World 2:586–606Google Scholar
- Helsel DR, Hirsch RM (1992) Statistical methods in water resources. Studies in environmental science. Elsevier, AmsterdamGoogle Scholar
- Kalff J (2002) Limnology. Prentice Hall, Upper Saddle River, NJGoogle Scholar
- Leppäranta M, Reinart A, Erm A et al (2003) Investigation of ice and water properties and under-ice light fields in fresh and brackish water bodies. Nord Hydrol 34:245–266Google Scholar
- Rodhe W (1955) Can phytoplankton production proceed during winter darkness in subarctic lakes? Verhandlungen der Internationalen Vereinigung für Limnologie 12:117–122Google Scholar
- SAS Institute Inc (2002) JMP statistics and graphics guide. Version 5, SAS InstituteGoogle Scholar
- Weyhenmeyer GA, Meili M, Livingstone DM (2005) Systematic differences in the trend towards earlier ice-out on Swedish lakes along a latitudinal temperature gradient. Verhandlungen der Internationalen Vereinigung für Limnologie 29:257–260Google Scholar