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| Titel |
Modelling the effects of atmospheric sulphur and nitrogen deposition on selected lakes and streams of the Central Alps (Italy) |
| 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 ; 7, no. 4 ; Nr. 7, no. 4, S.540-551 |
| Datensatznummer |
250004710
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| Publikation (Nr.) |
 copernicus.org/hess-7-540-2003.pdf |
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| Zusammenfassung |
| The dynamic model MAGIC was calibrated and applied to selected sites in
north-western Italy (3 rivers, 10 alpine lakes) to predict the future response of surface
water to different scenarios of atmospheric deposition of S and N compounds. Results at
the study sites suggest that several factors other than atmospheric deposition may
influence the long-term changes in surface water chemistry. At present the lumped approach
of dynamic models such as MAGIC cannot represent all the processes occurring at the
catchment scale. Climate warming in particular and its effects on surface water chemistry
proved to be important in the study area. Furthermore the river catchments considered
here showed clear signs of N saturation. This condition and the increasing concentrations
of NO3 in river water were simulated using N dynamics recently included in
MAGIC. The modelling performed in this study represents the first application of MAGIC
to Italian sites. The results show that inclusion of other factors specific to the
Mediterranean area, such as dust deposition and climate change, may improve the fit to
observed data and the reliability of the model forecast. Despite these limitations, the
model captured well the main trends in chemical data in both rivers and lakes. The
outputs clearly demonstrate the benefits of achieving the emission reductions in
both S and N compounds as agreed under the Gothenburg Protocol rather than making no
further emission reductions. It was also clear that, besides the substantial reduction
of SO4 deposition from the peak levels of the 1980s, N deposition must also
be reduced in the near future to protect freshwaters from further acidification.
Keywords: MAGIC, northern Italy, acidification, recovery, nitrogen saturation |
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