Coherent responses of sulphate concentration in Norwegian lakes: relationships with sulphur deposition and climate indices
International audience The coherence or synchrony in the trends in SO 4 2? 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 su...
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ftinsu:oai:HAL:hal-00304906v1 2023-11-12T04:13:53+01:00 Coherent responses of sulphate concentration in Norwegian lakes: relationships with sulphur deposition and climate indices Dillon, P. J. Skjelkvåle, B. L. Somers, K. M. Tørseth, K. Environmental and Resource Studies Trent University Norwegian Institute for Water Research (NIVA) Ontario Ministry of the Environment Dorset Research Centre Norwegian Institute for Air Research (NILU) 2003 https://hal.science/hal-00304906 https://hal.science/hal-00304906/document https://hal.science/hal-00304906/file/hess-7-596-2003.pdf en eng HAL CCSD European Geosciences Union hal-00304906 https://hal.science/hal-00304906 https://hal.science/hal-00304906/document https://hal.science/hal-00304906/file/hess-7-596-2003.pdf info:eu-repo/semantics/OpenAccess ISSN: 1812-2108 EISSN: 1812-2116 Hydrology and Earth System Sciences Discussions https://hal.science/hal-00304906 Hydrology and Earth System Sciences Discussions, 2003, 7 (4), pp.596-608 [SDU.ENVI]Sciences of the Universe [physics]/Continental interfaces environment [SDU.OCEAN]Sciences of the Universe [physics]/Ocean Atmosphere [SDU.STU]Sciences of the Universe [physics]/Earth Sciences info:eu-repo/semantics/article Journal articles 2003 ftinsu 2023-10-25T16:25:58Z International audience The coherence or synchrony in the trends in SO 4 2? 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 SO 4 2? 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 SO 4 2? trends, although there were even stronger relationships with average wet S deposition in the regions. When subsets of lakes with coherent SO 4 2? trends were selected from within each of the 10 regions, both wet S deposition and the climate indices were strongly correlated with those SO 4 2? 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 Article in Journal/Newspaper Arctic Climate change North Atlantic North Atlantic oscillation Institut national des sciences de l'Univers: HAL-INSU Arctic Norway |
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Open Polar |
collection |
Institut national des sciences de l'Univers: HAL-INSU |
op_collection_id |
ftinsu |
language |
English |
topic |
[SDU.ENVI]Sciences of the Universe [physics]/Continental interfaces environment [SDU.OCEAN]Sciences of the Universe [physics]/Ocean Atmosphere [SDU.STU]Sciences of the Universe [physics]/Earth Sciences |
spellingShingle |
[SDU.ENVI]Sciences of the Universe [physics]/Continental interfaces environment [SDU.OCEAN]Sciences of the Universe [physics]/Ocean Atmosphere [SDU.STU]Sciences of the Universe [physics]/Earth Sciences Dillon, P. J. Skjelkvåle, B. L. Somers, K. M. Tørseth, K. Coherent responses of sulphate concentration in Norwegian lakes: relationships with sulphur deposition and climate indices |
topic_facet |
[SDU.ENVI]Sciences of the Universe [physics]/Continental interfaces environment [SDU.OCEAN]Sciences of the Universe [physics]/Ocean Atmosphere [SDU.STU]Sciences of the Universe [physics]/Earth Sciences |
description |
International audience The coherence or synchrony in the trends in SO 4 2? 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 SO 4 2? 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 SO 4 2? trends, although there were even stronger relationships with average wet S deposition in the regions. When subsets of lakes with coherent SO 4 2? trends were selected from within each of the 10 regions, both wet S deposition and the climate indices were strongly correlated with those SO 4 2? 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 |
author2 |
Environmental and Resource Studies Trent University Norwegian Institute for Water Research (NIVA) Ontario Ministry of the Environment Dorset Research Centre Norwegian Institute for Air Research (NILU) |
format |
Article in Journal/Newspaper |
author |
Dillon, P. J. Skjelkvåle, B. L. Somers, K. M. Tørseth, K. |
author_facet |
Dillon, P. J. Skjelkvåle, B. L. Somers, K. M. Tørseth, K. |
author_sort |
Dillon, P. J. |
title |
Coherent responses of sulphate concentration in Norwegian lakes: relationships with sulphur deposition and climate indices |
title_short |
Coherent responses of sulphate concentration in Norwegian lakes: relationships with sulphur deposition and climate indices |
title_full |
Coherent responses of sulphate concentration in Norwegian lakes: relationships with sulphur deposition and climate indices |
title_fullStr |
Coherent responses of sulphate concentration in Norwegian lakes: relationships with sulphur deposition and climate indices |
title_full_unstemmed |
Coherent responses of sulphate concentration in Norwegian lakes: relationships with sulphur deposition and climate indices |
title_sort |
coherent responses of sulphate concentration in norwegian lakes: relationships with sulphur deposition and climate indices |
publisher |
HAL CCSD |
publishDate |
2003 |
url |
https://hal.science/hal-00304906 https://hal.science/hal-00304906/document https://hal.science/hal-00304906/file/hess-7-596-2003.pdf |
geographic |
Arctic Norway |
geographic_facet |
Arctic Norway |
genre |
Arctic Climate change North Atlantic North Atlantic oscillation |
genre_facet |
Arctic Climate change North Atlantic North Atlantic oscillation |
op_source |
ISSN: 1812-2108 EISSN: 1812-2116 Hydrology and Earth System Sciences Discussions https://hal.science/hal-00304906 Hydrology and Earth System Sciences Discussions, 2003, 7 (4), pp.596-608 |
op_relation |
hal-00304906 https://hal.science/hal-00304906 https://hal.science/hal-00304906/document https://hal.science/hal-00304906/file/hess-7-596-2003.pdf |
op_rights |
info:eu-repo/semantics/OpenAccess |
_version_ |
1782331676129492992 |