© EGU Coherent responses of sulphate concentration in Norwegian lakes: relationships with sulphur deposition and climate indices
2– The coherence or synchrony in the trends in SO concentration in a set of 100 lakes in Norway that have a long-term chemical record was 4 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...
| Main Authors: | , , , |
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| Format: | Text |
| Language: | English |
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| Online Access: | http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.371.5248 http://hal.archives-ouvertes.fr/docs/00/30/49/06/PDF/hess-7-596-2003.pdf |
| Summary: | 2– The coherence or synchrony in the trends in SO concentration in a set of 100 lakes in Norway that have a long-term chemical record was 4 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 2– varied substantially between lakes within each cluster. However, the average trend in SO concentration was evaluated in each of 10 regions 4 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 |
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