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| Titel |
Coherent responses of sulphate concentration in Norwegian lakes: relationships with sulphur deposition and climate indices |
| VerfasserIn |
P. J. Dillon, B. L. Skjelkvåle, K. M. Somers, K. Tørseth |
| 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.596-608 |
| Datensatznummer |
250004715
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| Publikation (Nr.) |
 copernicus.org/hess-7-596-2003.pdf |
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| Zusammenfassung |
| The coherence or synchrony in the trends in SO42–
concentration in a set of 100 lakes in Norway that have a long-term chemical record was
evaluated. Using a statistical technique that compares patterns or trends that are not
uni-directional, the lakes were grouped into 18 subsets or clusters, each with between
2 and 11 lakes that had similar trends. These temporal trends were strongly correlated
with several climate indices, notably the Arctic Oscillation Index (AOI) measured in the
autumn, and the annual North Atlantic Oscillation Index (NAOI). Because these clusters
of lakes were spatially dispersed, they could not be compared directly with trends in
wet S deposition, because S deposition varied substantially between lakes within each
cluster. However, the average trend in SO42– concentration was
evaluated in each of 10 regions of Norway that were defined previously on the basis of
pollution load, meteorological variables and biogeography. Although these regions did
not match the statistically-selected clusters of lakes with equal trends very closely,
there were similar, strong correlations between climate indices (the AOI and NAOI) and
the 10 average SO42– trends, although there were even stronger
relationships with average wet S deposition in the regions. When subsets of lakes with
coherent SO42– trends were selected from within each of the
10 regions, both wet S deposition and the climate indices were strongly correlated with
those SO42– trends. Hence, lakes in Norway respond to changes in
wet S deposition and are influenced by large-scale, i.e. global, climate signals. Future
evaluation of recovery of lakes affected by acid deposition must therefore consider the
confounding effects of climate and potential climate change.
Keywords: recovery, acid deposition, coherence, sulphate, climate change |
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