Coherent response of lakes in Ontario, Canada to reductions in sulphur deposition: the effects of climate on sulphate concentrations
International audience Sulphate deposition in south-central Ontario declined between 1976 and 2000 by more than 50%, whereas lake sulphate (SO 4 2? ) concentrations decreased by, on average, only half as much. To investigate the factors that controlled this slower than expected response, the tempora...
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ftinsu:oai:HAL:hal-00304904v1 2023-11-12T04:22:50+01:00 Coherent response of lakes in Ontario, Canada to reductions in sulphur deposition: the effects of climate on sulphate concentrations Dillon, P. J. Somers, K. M. Findeis, J. Eimers, M. C. Environmental and Resource Studies Trent University Dorset Environmental Science Centre Ontario Ministry of the Environment and Climate Change 2003 https://hal.science/hal-00304904 https://hal.science/hal-00304904/document https://hal.science/hal-00304904/file/hess-7-583-2003.pdf en eng HAL CCSD European Geosciences Union hal-00304904 https://hal.science/hal-00304904 https://hal.science/hal-00304904/document https://hal.science/hal-00304904/file/hess-7-583-2003.pdf info:eu-repo/semantics/OpenAccess ISSN: 1812-2108 EISSN: 1812-2116 Hydrology and Earth System Sciences Discussions https://hal.science/hal-00304904 Hydrology and Earth System Sciences Discussions, 2003, 7 (4), pp.583-595 [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 Sulphate deposition in south-central Ontario declined between 1976 and 2000 by more than 50%, whereas lake sulphate (SO 4 2? ) concentrations decreased by, on average, only half as much. To investigate the factors that controlled this slower than expected response, the temporal patterns in lake SO 4 2? concentrations were compared with patterns in both deposition and climate, since climate has a major influence on the hydrological cycle in this part of the continent. To do this, the temporal coherence in SO 4 2? concentrations between 9 lake basins was estimated using the intraclass correlation from a repeated-measures analysis of variance and two subsets of lakes were found (six in one group, four in the other), each with lakes having synchronous patterns. One subset (4 lakes) included the 3 with the longest water replenishment times (>3.4 yr) which are expected to respond to decreases in SO 4 2? deposition more slowly. However, the average pattern reflecting the temporal changes of each of the two subsets was very similar. The response of both subsets of lakes to the decreasing SO 4 2? deposition over two decades was independent of the degree of acidification or sensitivity to acidification of the lakes. In a determination of which factors best predicted each of those two subsets' SO 4 2? time series, good predictive models were produced by regional/global-scale climate indices, specifically the Southern Oscillation Index (SOI) describing the El Niño Southern Oscillation (ENSO) and the North Atlantic Oscillation Index (NAOI), as well as by SO 4 2? deposition indices. When the predictor variables were combined, models which described the long-term changes in lake SO 4 2? concentration best included the SOI, the NAOI and SO 4 2? deposition. Thus, large-scale climate factors play a major role in determining the response of aquatic systems to changes in SO 4 2? deposition, perhaps through their influence on lake and/or catchment processes that effectively delay recovery. Keywords: ... Article in Journal/Newspaper North Atlantic North Atlantic oscillation Institut national des sciences de l'Univers: HAL-INSU Canada Soi ENVELOPE(30.704,30.704,66.481,66.481) |
institution |
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. Somers, K. M. Findeis, J. Eimers, M. C. Coherent response of lakes in Ontario, Canada to reductions in sulphur deposition: the effects of climate on sulphate concentrations |
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 Sulphate deposition in south-central Ontario declined between 1976 and 2000 by more than 50%, whereas lake sulphate (SO 4 2? ) concentrations decreased by, on average, only half as much. To investigate the factors that controlled this slower than expected response, the temporal patterns in lake SO 4 2? concentrations were compared with patterns in both deposition and climate, since climate has a major influence on the hydrological cycle in this part of the continent. To do this, the temporal coherence in SO 4 2? concentrations between 9 lake basins was estimated using the intraclass correlation from a repeated-measures analysis of variance and two subsets of lakes were found (six in one group, four in the other), each with lakes having synchronous patterns. One subset (4 lakes) included the 3 with the longest water replenishment times (>3.4 yr) which are expected to respond to decreases in SO 4 2? deposition more slowly. However, the average pattern reflecting the temporal changes of each of the two subsets was very similar. The response of both subsets of lakes to the decreasing SO 4 2? deposition over two decades was independent of the degree of acidification or sensitivity to acidification of the lakes. In a determination of which factors best predicted each of those two subsets' SO 4 2? time series, good predictive models were produced by regional/global-scale climate indices, specifically the Southern Oscillation Index (SOI) describing the El Niño Southern Oscillation (ENSO) and the North Atlantic Oscillation Index (NAOI), as well as by SO 4 2? deposition indices. When the predictor variables were combined, models which described the long-term changes in lake SO 4 2? concentration best included the SOI, the NAOI and SO 4 2? deposition. Thus, large-scale climate factors play a major role in determining the response of aquatic systems to changes in SO 4 2? deposition, perhaps through their influence on lake and/or catchment processes that effectively delay recovery. Keywords: ... |
author2 |
Environmental and Resource Studies Trent University Dorset Environmental Science Centre Ontario Ministry of the Environment and Climate Change |
format |
Article in Journal/Newspaper |
author |
Dillon, P. J. Somers, K. M. Findeis, J. Eimers, M. C. |
author_facet |
Dillon, P. J. Somers, K. M. Findeis, J. Eimers, M. C. |
author_sort |
Dillon, P. J. |
title |
Coherent response of lakes in Ontario, Canada to reductions in sulphur deposition: the effects of climate on sulphate concentrations |
title_short |
Coherent response of lakes in Ontario, Canada to reductions in sulphur deposition: the effects of climate on sulphate concentrations |
title_full |
Coherent response of lakes in Ontario, Canada to reductions in sulphur deposition: the effects of climate on sulphate concentrations |
title_fullStr |
Coherent response of lakes in Ontario, Canada to reductions in sulphur deposition: the effects of climate on sulphate concentrations |
title_full_unstemmed |
Coherent response of lakes in Ontario, Canada to reductions in sulphur deposition: the effects of climate on sulphate concentrations |
title_sort |
coherent response of lakes in ontario, canada to reductions in sulphur deposition: the effects of climate on sulphate concentrations |
publisher |
HAL CCSD |
publishDate |
2003 |
url |
https://hal.science/hal-00304904 https://hal.science/hal-00304904/document https://hal.science/hal-00304904/file/hess-7-583-2003.pdf |
long_lat |
ENVELOPE(30.704,30.704,66.481,66.481) |
geographic |
Canada Soi |
geographic_facet |
Canada Soi |
genre |
North Atlantic North Atlantic oscillation |
genre_facet |
North Atlantic North Atlantic oscillation |
op_source |
ISSN: 1812-2108 EISSN: 1812-2116 Hydrology and Earth System Sciences Discussions https://hal.science/hal-00304904 Hydrology and Earth System Sciences Discussions, 2003, 7 (4), pp.583-595 |
op_relation |
hal-00304904 https://hal.science/hal-00304904 https://hal.science/hal-00304904/document https://hal.science/hal-00304904/file/hess-7-583-2003.pdf |
op_rights |
info:eu-repo/semantics/OpenAccess |
_version_ |
1782337768868806656 |