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| Titel |
Trends in the chemistry of atmospheric deposition and surface waters in the Lake Maggiore catchment |
| VerfasserIn |
M. Rogora, A. Marchetto, R. Mosello |
| Medientyp |
Artikel
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| Sprache |
Englisch
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| ISSN |
1027-5606
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| Digitales Dokument |
URL |
| Erschienen |
In: Hydrology and Earth System Sciences ; 5, no. 3 ; Nr. 5, no. 3, S.379-390 |
| Datensatznummer |
250002561
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| Publikation (Nr.) |
 copernicus.org/hess-5-379-2001.pdf |
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| Zusammenfassung |
| 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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