Over‐Winter Channel Bed Temperature Regimes Generated by Contrasting Snow Accumulation in a High Arctic River
We report experimental results of near‐surface winter temperatures along and adjacent to the channel bed of a High Arctic river on Melville Island, Canada. Temperature loggers 5 cm below the ground surface in areas where the terrain suggests varying snow accumulation patterns revealed that the maxim...
Published in: | Permafrost and Periglacial Processes |
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Online Access: | https://doi.org/10.1002/ppp.1902 |
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ftrepec:oai:RePEc:wly:perpro:v:28:y:2017:i:1:p:339-346 2023-05-15T14:51:42+02:00 Over‐Winter Channel Bed Temperature Regimes Generated by Contrasting Snow Accumulation in a High Arctic River Philip P. Bonnaventure Scott F. Lamoureux Elena A. Favaro https://doi.org/10.1002/ppp.1902 unknown https://doi.org/10.1002/ppp.1902 article ftrepec https://doi.org/10.1002/ppp.1902 2020-12-04T13:31:03Z We report experimental results of near‐surface winter temperatures along and adjacent to the channel bed of a High Arctic river on Melville Island, Canada. Temperature loggers 5 cm below the ground surface in areas where the terrain suggests varying snow accumulation patterns revealed that the maximum winter difference between air and near‐surface temperatures ranged from 0 to +30°C during the winter of 2012–13, and that shallow near‐surface freezing conditions were delayed for up to 21 days in some locations. Cooling to ‐10°C was delayed for up to 117 days. Modelled temperature at the top of permafrost indicates that permafrost at locations with thick snow can be up to 8°C warmer than those with thin snow. This thermal evidence for an ameliorated surface environment indicates the potential for substantial extended microbial and biogeochemical cycling during early winter. Rapid thaw of the bed during initiation of snowmelt in spring also indicates a high degree of hydrological connectivity. Therefore, snow‐filled channels may contribute to biogeochemical and aquatic cycling in High Arctic rivers. Copyright © 2016 John Wiley & Sons, Ltd. Article in Journal/Newspaper Arctic permafrost Melville Island RePEc (Research Papers in Economics) Arctic Canada Permafrost and Periglacial Processes 28 1 339 346 |
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Open Polar |
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RePEc (Research Papers in Economics) |
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ftrepec |
language |
unknown |
description |
We report experimental results of near‐surface winter temperatures along and adjacent to the channel bed of a High Arctic river on Melville Island, Canada. Temperature loggers 5 cm below the ground surface in areas where the terrain suggests varying snow accumulation patterns revealed that the maximum winter difference between air and near‐surface temperatures ranged from 0 to +30°C during the winter of 2012–13, and that shallow near‐surface freezing conditions were delayed for up to 21 days in some locations. Cooling to ‐10°C was delayed for up to 117 days. Modelled temperature at the top of permafrost indicates that permafrost at locations with thick snow can be up to 8°C warmer than those with thin snow. This thermal evidence for an ameliorated surface environment indicates the potential for substantial extended microbial and biogeochemical cycling during early winter. Rapid thaw of the bed during initiation of snowmelt in spring also indicates a high degree of hydrological connectivity. Therefore, snow‐filled channels may contribute to biogeochemical and aquatic cycling in High Arctic rivers. Copyright © 2016 John Wiley & Sons, Ltd. |
format |
Article in Journal/Newspaper |
author |
Philip P. Bonnaventure Scott F. Lamoureux Elena A. Favaro |
spellingShingle |
Philip P. Bonnaventure Scott F. Lamoureux Elena A. Favaro Over‐Winter Channel Bed Temperature Regimes Generated by Contrasting Snow Accumulation in a High Arctic River |
author_facet |
Philip P. Bonnaventure Scott F. Lamoureux Elena A. Favaro |
author_sort |
Philip P. Bonnaventure |
title |
Over‐Winter Channel Bed Temperature Regimes Generated by Contrasting Snow Accumulation in a High Arctic River |
title_short |
Over‐Winter Channel Bed Temperature Regimes Generated by Contrasting Snow Accumulation in a High Arctic River |
title_full |
Over‐Winter Channel Bed Temperature Regimes Generated by Contrasting Snow Accumulation in a High Arctic River |
title_fullStr |
Over‐Winter Channel Bed Temperature Regimes Generated by Contrasting Snow Accumulation in a High Arctic River |
title_full_unstemmed |
Over‐Winter Channel Bed Temperature Regimes Generated by Contrasting Snow Accumulation in a High Arctic River |
title_sort |
over‐winter channel bed temperature regimes generated by contrasting snow accumulation in a high arctic river |
url |
https://doi.org/10.1002/ppp.1902 |
geographic |
Arctic Canada |
geographic_facet |
Arctic Canada |
genre |
Arctic permafrost Melville Island |
genre_facet |
Arctic permafrost Melville Island |
op_relation |
https://doi.org/10.1002/ppp.1902 |
op_doi |
https://doi.org/10.1002/ppp.1902 |
container_title |
Permafrost and Periglacial Processes |
container_volume |
28 |
container_issue |
1 |
container_start_page |
339 |
op_container_end_page |
346 |
_version_ |
1766322817610022912 |