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Hydrology and Earth System Sciences An interactive open-access journal of the European Geosciences Union
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Volume 5, issue 3
Hydrol. Earth Syst. Sci., 5, 379–390, 2001
https://doi.org/10.5194/hess-5-379-2001
© Author(s) 2001. This work is licensed under
the Creative Commons Attribution-NonCommercial-ShareAlike 2.5 License.

Special issue: Assessment of recovery of European surface waters from...

Hydrol. Earth Syst. Sci., 5, 379–390, 2001
https://doi.org/10.5194/hess-5-379-2001
© Author(s) 2001. This work is licensed under
the Creative Commons Attribution-NonCommercial-ShareAlike 2.5 License.

  30 Sep 2001

30 Sep 2001

Trends in the chemistry of atmospheric deposition and surface waters in the Lake Maggiore catchment

M. Rogora, A. Marchetto, and R. Mosello M. Rogora et al.
  • C.N.R. Istituto Italiano di Idrobiologia, L.go Tonolli 50-52, I-28922 Verbania Pallanza, Italy
  • Email for corresponding author: a.marchetto@iii.to.cnr.it

Abstract. The Lake Maggiore catchment is the area of Italy most affected by acid deposition. Trend analysis was performed on long-term (15-30 years) series of chemical analyses of atmospheric deposition, four small rivers draining forested catchments and four high mountain lakes. An improvement in the quality of atmospheric deposition was detected, due to decreasing sulphate concentration and increasing pH. Similar trends were also found in high mountain lakes and in small rivers. Atmospheric deposition, however, is still providing a large and steady flux of nitrogen compounds (nitrate and ammonium) which is causing increasing nitrogen saturation in forest ecosystems and increasing nitrate levels in rivers. Besides atmospheric deposition, an important factor controlling water acidification and recovery is the weathering of rocks and soils which may be influenced by climate warming. A further factor is the episodic deposition of Saharan calcareous dust which contributes significantly to base cation deposition.

Keywords: trend, atmospheric deposition, nitrogen, stream water chemistry.

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