 |
| Titel |
Recovery from acidification in European surface waters |
| VerfasserIn |
C. D. Evans, J. M. Cullen, C. Alewell, J. Kopáček, A. Marchetto, F. Moldan, A. Prechtel, M. Rogora, J. Vesely, R. Wright |
| Medientyp |
Artikel
|
| Sprache |
Englisch
|
| ISSN |
1027-5606
|
| Digitales Dokument |
URL |
| Erschienen |
In: Hydrology and Earth System Sciences ; 5, no. 3 ; Nr. 5, no. 3, S.283-298 |
| Datensatznummer |
250002554
|
| Publikation (Nr.) |
 copernicus.org/hess-5-283-2001.pdf |
|
|
|
|
|
| Zusammenfassung |
| Water quality data for
56 long-term monitoring sites in eight European countries are used to assess
freshwater responses to reductions in acid deposition at a
large spatial scale. In a consistent analysis of trends from 1980 onwards, the
majority of surface waters (38 of 56) showed significant
(p ≤0.05) decreasing trends in pollution-derived sulphate. Only two sites showed
a significant increase. Nitrate, on the other hand, had a
much weaker and more varied pattern, with no significant trend at 35 of 56
sites, decreases at some sites in Scandinavia and Central
Europe, and increases at some sites in Italy and the UK. The general reduction
in surface water acid anion concentrations has led to increases
in acid neutralising capacity (significant at 27 of 56 sites) but has also been
offset in part by decreases in base cations, particularly calcium
(significant at 26 of 56 sites), indicating that much of the improvement in
runoff quality to date has been the result of decreasing ionic
strength. Increases in acid neutralising capacity have been accompanied by
increases in pH and decreases in aluminium, although fewer trends
were significant (pH 19 of 56, aluminium 13 of 53). Increases in pH appear to
have been limited in some areas by rising concentrations of
organic acids. Within a general trend towards recovery, some inter-regional
variation is evident, with recovery strongest in the Czech Republic
and Slovakia, moderate in Scandinavia and the United Kingdom, and apparently
weakest in Germany.
Keywords: acidification, recovery, European trends, sulphate, nitrate,
acid neutralising capacity |
| |
|
| Teil von |
|
|
|
|
|
|
|
|