Recent trends and variability in river discharge across northern Canada
This study presents an analysis of the observed inter-annual variability and inter-decadal trends in river discharge across northern Canada for 1964–2013. The 42 rivers chosen for this study span a combined gauged area of 5.26 × 106 km2 and are selected based on data availability and quality, gauged...
Published in: | Hydrology and Earth System Sciences |
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Copernicus Publications
2016
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ftnonlinearchiv:oai:noa.gwlb.de:cop_mods_00042939 2023-05-15T14:52:03+02:00 Recent trends and variability in river discharge across northern Canada Déry, Stephen J. Stadnyk, Tricia A. MacDonald, Matthew K. Gauli-Sharma, Bunu 2016-12 electronic https://doi.org/10.5194/hess-20-4801-2016 https://noa.gwlb.de/receive/cop_mods_00042939 https://noa.gwlb.de/servlets/MCRFileNodeServlet/cop_derivate_00042559/hess-20-4801-2016.pdf https://hess.copernicus.org/articles/20/4801/2016/hess-20-4801-2016.pdf eng eng Copernicus Publications Hydrology and Earth System Sciences -- http://www.bibliothek.uni-regensburg.de/ezeit/?2100610 -- http://www.hydrol-earth-syst-sci.net/volumes_and_issues.html -- 1607-7938 https://doi.org/10.5194/hess-20-4801-2016 https://noa.gwlb.de/receive/cop_mods_00042939 https://noa.gwlb.de/servlets/MCRFileNodeServlet/cop_derivate_00042559/hess-20-4801-2016.pdf https://hess.copernicus.org/articles/20/4801/2016/hess-20-4801-2016.pdf uneingeschränkt info:eu-repo/semantics/openAccess article Verlagsveröffentlichung article Text doc-type:article 2016 ftnonlinearchiv https://doi.org/10.5194/hess-20-4801-2016 2022-02-08T22:40:49Z This study presents an analysis of the observed inter-annual variability and inter-decadal trends in river discharge across northern Canada for 1964–2013. The 42 rivers chosen for this study span a combined gauged area of 5.26 × 106 km2 and are selected based on data availability and quality, gauged area and record length. Inter-annual variability in river discharge is greatest for the eastern Arctic Ocean (coefficient of variation, CV = 16 %) due to the Caniapiscau River diversion into the La Grande Rivière system for enhanced hydropower production. Variability is lowest for the study area as a whole (CV = 7 %). Based on the Mann–Kendall test (MKT), no significant (p > 0.05) trend in annual discharge from 1964 to 2013 is observed in the Bering Sea, western Arctic Ocean, western Hudson and James Bay, and Labrador Sea; for northern Canada as a whole, however, a statistically significant (p < 0.05) decline of 102.8 km3 25 yr−1 in discharge occurs over the first half of the study period followed by a statistically significant (p < 0.05) increase of 208.8 km3 25 yr−1 in the latter half. Increasing (decreasing) trends in river discharge to the eastern Hudson and James Bay (eastern Arctic Ocean) are largely explained by the Caniapiscau diversion to the La Grande Rivière system. Strong regional variations in seasonal trends of river discharge are observed, with overall winter (summer) flows increasing (decreasing, with the exception of the most recent decade) partly due to flow regulation and storage for enhanced hydropower production along the Hudson and James Bay, the eastern Arctic Ocean and Labrador Sea. Flow regulation also suppresses the natural variability of river discharge, particularly during cold seasons. Article in Journal/Newspaper Arctic Arctic Ocean Bering Sea La Grande Rivière Labrador Sea James Bay Niedersächsisches Online-Archiv NOA Arctic Arctic Ocean Bering Sea Canada Hudson Kendall ENVELOPE(-59.828,-59.828,-63.497,-63.497) La Grande Rivière ENVELOPE(-79.000,-79.000,53.834,53.834) Hydrology and Earth System Sciences 20 12 4801 4818 |
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article Verlagsveröffentlichung |
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article Verlagsveröffentlichung Déry, Stephen J. Stadnyk, Tricia A. MacDonald, Matthew K. Gauli-Sharma, Bunu Recent trends and variability in river discharge across northern Canada |
topic_facet |
article Verlagsveröffentlichung |
description |
This study presents an analysis of the observed inter-annual variability and inter-decadal trends in river discharge across northern Canada for 1964–2013. The 42 rivers chosen for this study span a combined gauged area of 5.26 × 106 km2 and are selected based on data availability and quality, gauged area and record length. Inter-annual variability in river discharge is greatest for the eastern Arctic Ocean (coefficient of variation, CV = 16 %) due to the Caniapiscau River diversion into the La Grande Rivière system for enhanced hydropower production. Variability is lowest for the study area as a whole (CV = 7 %). Based on the Mann–Kendall test (MKT), no significant (p > 0.05) trend in annual discharge from 1964 to 2013 is observed in the Bering Sea, western Arctic Ocean, western Hudson and James Bay, and Labrador Sea; for northern Canada as a whole, however, a statistically significant (p < 0.05) decline of 102.8 km3 25 yr−1 in discharge occurs over the first half of the study period followed by a statistically significant (p < 0.05) increase of 208.8 km3 25 yr−1 in the latter half. Increasing (decreasing) trends in river discharge to the eastern Hudson and James Bay (eastern Arctic Ocean) are largely explained by the Caniapiscau diversion to the La Grande Rivière system. Strong regional variations in seasonal trends of river discharge are observed, with overall winter (summer) flows increasing (decreasing, with the exception of the most recent decade) partly due to flow regulation and storage for enhanced hydropower production along the Hudson and James Bay, the eastern Arctic Ocean and Labrador Sea. Flow regulation also suppresses the natural variability of river discharge, particularly during cold seasons. |
format |
Article in Journal/Newspaper |
author |
Déry, Stephen J. Stadnyk, Tricia A. MacDonald, Matthew K. Gauli-Sharma, Bunu |
author_facet |
Déry, Stephen J. Stadnyk, Tricia A. MacDonald, Matthew K. Gauli-Sharma, Bunu |
author_sort |
Déry, Stephen J. |
title |
Recent trends and variability in river discharge across northern Canada |
title_short |
Recent trends and variability in river discharge across northern Canada |
title_full |
Recent trends and variability in river discharge across northern Canada |
title_fullStr |
Recent trends and variability in river discharge across northern Canada |
title_full_unstemmed |
Recent trends and variability in river discharge across northern Canada |
title_sort |
recent trends and variability in river discharge across northern canada |
publisher |
Copernicus Publications |
publishDate |
2016 |
url |
https://doi.org/10.5194/hess-20-4801-2016 https://noa.gwlb.de/receive/cop_mods_00042939 https://noa.gwlb.de/servlets/MCRFileNodeServlet/cop_derivate_00042559/hess-20-4801-2016.pdf https://hess.copernicus.org/articles/20/4801/2016/hess-20-4801-2016.pdf |
long_lat |
ENVELOPE(-59.828,-59.828,-63.497,-63.497) ENVELOPE(-79.000,-79.000,53.834,53.834) |
geographic |
Arctic Arctic Ocean Bering Sea Canada Hudson Kendall La Grande Rivière |
geographic_facet |
Arctic Arctic Ocean Bering Sea Canada Hudson Kendall La Grande Rivière |
genre |
Arctic Arctic Ocean Bering Sea La Grande Rivière Labrador Sea James Bay |
genre_facet |
Arctic Arctic Ocean Bering Sea La Grande Rivière Labrador Sea James Bay |
op_relation |
Hydrology and Earth System Sciences -- http://www.bibliothek.uni-regensburg.de/ezeit/?2100610 -- http://www.hydrol-earth-syst-sci.net/volumes_and_issues.html -- 1607-7938 https://doi.org/10.5194/hess-20-4801-2016 https://noa.gwlb.de/receive/cop_mods_00042939 https://noa.gwlb.de/servlets/MCRFileNodeServlet/cop_derivate_00042559/hess-20-4801-2016.pdf https://hess.copernicus.org/articles/20/4801/2016/hess-20-4801-2016.pdf |
op_rights |
uneingeschränkt info:eu-repo/semantics/openAccess |
op_doi |
https://doi.org/10.5194/hess-20-4801-2016 |
container_title |
Hydrology and Earth System Sciences |
container_volume |
20 |
container_issue |
12 |
container_start_page |
4801 |
op_container_end_page |
4818 |
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1766323171380690944 |