Abstract
Seasonal fluctuations as well as long-term trends in water chemistry were studied in Schwarzsee ob Sölden (Tyrol, Austria), an oligotrophic softwater lake situated at 2796 m a.s.l. The catchement is composed of granite, plagioclase and micaschists containing considerable amounts of sulphur, with little soil cover. The lake is ice covered for about nine months, during this time the deepest layers (>16m) become anoxic. During summer overturn, alkalinity (ALK) is lowest (−8 μeq l−1) in the whole water column, whereas pH reaches its minimum (4.88) at the surface during snowmelt. A decrease of pH from 5.8 to 5.4 during winter is caused by CO2 oversaturation, but deep water ALK increases to up to 130 μeq l−1 due to in-lake ALK generation by reductive processes and base cation (BC) release. The seasonal pattern of ALK in SOS is driven by in-lake processes in winter, the snowmelting in spring and watershed processes and precipitation during summer. Since 1989 summer sulfate concentrations in SOS, originating mainly from the catchment, show a tendency to increase presumably caused by enhanced weathering. In contrast, SO4 2− concentrations in other high mountain lakes which are dominated by atmospheric depositions show a decreasing trend. SOS is a good example for the complexity of interactions between catchment and in-lake processes which act at different time scales and depend on climate changes and atmospheric inputs.
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References
Camarero, L., Catalan, J., Boggero, A., Marchetto, A., Mosello, R. and Psenner, R.: 1995, “Acidification in high mountain lakes in central, southwest and southeast Europe (Alps, Pyrenees, Pirin)“, Limnologia, 25, 141–156.
Marchetto, A., Mosello, R., Psenner, R. Bendetta, G., Boggero, A., Tait, D. and Tartari, G. A.: 1995, “Factors affecting water chemistry of alpine lakes”, Aquat Sci. 57, 81–89.
Mosello, R., Tartari, G. and Tartari, G. A.: 1985, “Chemistry of bulk deposition at Pallanza (Northern Italy) during the decade 1975–1984”. Mem. Ist Ital. Idrobiol 43, 311–332.
Mosello, R., Barbieri, A., Bendetta, G., Boggero, A., Marchetto, A., Psenner, R., Tait, D. and Tartari, G.: 1992, “Quantification of the susceptibility of alpine lakes to acidification”, Mem. Ist. Ital. Idrobiol. 52, 355–385.
Psenner, R.: 1988, “Alkalinity generation in a soft-water lake: Watershed and in-lake processes”, Limnol. Oceanogr. 33, 1463–1475.
Psenner, R. and Schmidt, R.: 1992, “Climate driven pH control of alpine lakes and man-made perturbations“ Nature 356, 781–783.
Psenner R. and Catalan, J.: 1994, “Chemical composition of lakes in crystalline basins: a combination of atmospheric deposition, geologic background, biological activity and human action“, in: Limnology now A paradigm of planetary problems (ed. Margalef R.): 255–314.
Schindler, D. W.: 1988, “Confusion over the origin of alkalinity in lakes“, Limnol. Oceanogr. 33, 1637–1640.
Stoddard, J. L.: 1987, “Alkalinity dynamics in an unacidified alpine lake, Sierra Nevada, California“, Limnol. Oceanogr. 35, 825–839.
Wögrath, S. and Psenner, R.: 1995, “Hochgebirgsseen in Tirol: Hairlachersee, Gossenköllesee, Mutterbergersee und Schwarzsee ob Sölden“ in: Psenner et al. (eds.) Gewässerversauerung in Österreich Versauerungsentwicklung von Flüssen und Seen 1889–1992. Wasserwirtschaft Wasservorsorge; Bundesministerium für Land- und Forstwirtschaft/Wien.
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Wögrath, S., Psenner, R. Seasonal, annual and long-term variability in the water chemistry of a remote high mountain lake: Acid rain versus natural changes. Water Air Soil Pollut 85, 359–364 (1995). https://doi.org/10.1007/BF00476855
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DOI: https://doi.org/10.1007/BF00476855