Contrasted geomorphological and limnological properties of thermokarst lakes formed in buried glacier ice and ice-wedge polygon terrain.
In formerly glaciated permafrost regions, extensive areas are still underlain by a considerable amount of glacier ice buried by glacigenic sediments. It is expected that large parts of glacier ice buried in the permafrost will melt in the near future, although the intensity and timing will depend on...
Published in: | The Cryosphere |
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2022
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Online Access: | https://espace.inrs.ca/id/eprint/13068/ https://espace.inrs.ca/id/eprint/13068/1/P4041.pdf https://doi.org/10.5194/tc-16-2837-2022 |
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ftinrsquebec:oai:espace.inrs.ca:13068 2023-05-15T15:03:51+02:00 Contrasted geomorphological and limnological properties of thermokarst lakes formed in buried glacier ice and ice-wedge polygon terrain. Coulombe, Stéphanie Fortier, Daniel Bouchard, Frédéric Paquette, Michel Charbonneau, Simon Lacelle, Denis Laurion, Isabelle Pienitz, Reinhard 2022 application/pdf https://espace.inrs.ca/id/eprint/13068/ https://espace.inrs.ca/id/eprint/13068/1/P4041.pdf https://doi.org/10.5194/tc-16-2837-2022 en eng https://espace.inrs.ca/id/eprint/13068/1/P4041.pdf Coulombe, Stéphanie, Fortier, Daniel, Bouchard, Frédéric, Paquette, Michel, Charbonneau, Simon, Lacelle, Denis, Laurion, Isabelle orcid:0000-0001-8694-3330 et Pienitz, Reinhard (2022). Contrasted geomorphological and limnological properties of thermokarst lakes formed in buried glacier ice and ice-wedge polygon terrain. The Cryosphere , vol. 16 , nº 7. p. 2837-2857. DOI:10.5194/tc-16-2837-2022 <https://doi.org/10.5194/tc-16-2837-2022>. doi:10.5194/tc-16-2837-2022 bathymetry consolidation global warming greenhouse gas lacustrine deposit landscape evolution melting permafrost remote sensing satellite data thermokarst Article Évalué par les pairs 2022 ftinrsquebec https://doi.org/10.5194/tc-16-2837-2022 2023-02-10T11:47:33Z In formerly glaciated permafrost regions, extensive areas are still underlain by a considerable amount of glacier ice buried by glacigenic sediments. It is expected that large parts of glacier ice buried in the permafrost will melt in the near future, although the intensity and timing will depend on local terrain conditions and the magnitude and rate of future climate trends in different Arctic regions. The impact of these ice bodies on landscape evolution remains uncertain since the extent and volume of undisturbed relict glacier ice are unknown. These remnants of glacier ice buried and preserved in the permafrost contribute to the high spatial variability in ground ice condition of these landscapes, leading to the formation of lakes with diverse origins and morphometric and limnological properties. This study focuses on thermokarst lake initiation and development in response to varying ground ice conditions in a glacial valley on Bylot Island (Nunavut). We studied a lake-rich area using lake sediment cores, detailed bathymetric data, remotely sensed data and observations of buried glacier ice exposures. Our results suggest that initiation of thermokarst lakes in the valley was triggered from the melting of either buried glacier ice or intrasedimental ice and ice wedges. Over time, all lakes enlarged through thermal and mechanical shoreline erosion, as well as vertically through thaw consolidation and subsidence. Some of them coalesced with neighbouring water bodies to develop larger lakes. These glacial thermokarst lakes formed in buried glacier ice now evolve as “classic” thermokarst lakes that expand in area and volume as a result of the melting of intrasedimental ground ice in the surrounding material and the underlying glaciofluvial and till material. It is expected that the deepening of thaw bulbs (taliks) and the enlargement of Arctic lakes in response to global warming will reach undisturbed buried glacier ice where it is still present, which in turn will substantially alter lake bathymetry, ... Article in Journal/Newspaper Arctic Bylot Island Global warming Ice Nunavut permafrost The Cryosphere Thermokarst wedge* Institut national de la recherche scientifique, Québec: Espace INRS Arctic Nunavut Bylot Island The Cryosphere 16 7 2837 2857 |
institution |
Open Polar |
collection |
Institut national de la recherche scientifique, Québec: Espace INRS |
op_collection_id |
ftinrsquebec |
language |
English |
topic |
bathymetry consolidation global warming greenhouse gas lacustrine deposit landscape evolution melting permafrost remote sensing satellite data thermokarst |
spellingShingle |
bathymetry consolidation global warming greenhouse gas lacustrine deposit landscape evolution melting permafrost remote sensing satellite data thermokarst Coulombe, Stéphanie Fortier, Daniel Bouchard, Frédéric Paquette, Michel Charbonneau, Simon Lacelle, Denis Laurion, Isabelle Pienitz, Reinhard Contrasted geomorphological and limnological properties of thermokarst lakes formed in buried glacier ice and ice-wedge polygon terrain. |
topic_facet |
bathymetry consolidation global warming greenhouse gas lacustrine deposit landscape evolution melting permafrost remote sensing satellite data thermokarst |
description |
In formerly glaciated permafrost regions, extensive areas are still underlain by a considerable amount of glacier ice buried by glacigenic sediments. It is expected that large parts of glacier ice buried in the permafrost will melt in the near future, although the intensity and timing will depend on local terrain conditions and the magnitude and rate of future climate trends in different Arctic regions. The impact of these ice bodies on landscape evolution remains uncertain since the extent and volume of undisturbed relict glacier ice are unknown. These remnants of glacier ice buried and preserved in the permafrost contribute to the high spatial variability in ground ice condition of these landscapes, leading to the formation of lakes with diverse origins and morphometric and limnological properties. This study focuses on thermokarst lake initiation and development in response to varying ground ice conditions in a glacial valley on Bylot Island (Nunavut). We studied a lake-rich area using lake sediment cores, detailed bathymetric data, remotely sensed data and observations of buried glacier ice exposures. Our results suggest that initiation of thermokarst lakes in the valley was triggered from the melting of either buried glacier ice or intrasedimental ice and ice wedges. Over time, all lakes enlarged through thermal and mechanical shoreline erosion, as well as vertically through thaw consolidation and subsidence. Some of them coalesced with neighbouring water bodies to develop larger lakes. These glacial thermokarst lakes formed in buried glacier ice now evolve as “classic” thermokarst lakes that expand in area and volume as a result of the melting of intrasedimental ground ice in the surrounding material and the underlying glaciofluvial and till material. It is expected that the deepening of thaw bulbs (taliks) and the enlargement of Arctic lakes in response to global warming will reach undisturbed buried glacier ice where it is still present, which in turn will substantially alter lake bathymetry, ... |
format |
Article in Journal/Newspaper |
author |
Coulombe, Stéphanie Fortier, Daniel Bouchard, Frédéric Paquette, Michel Charbonneau, Simon Lacelle, Denis Laurion, Isabelle Pienitz, Reinhard |
author_facet |
Coulombe, Stéphanie Fortier, Daniel Bouchard, Frédéric Paquette, Michel Charbonneau, Simon Lacelle, Denis Laurion, Isabelle Pienitz, Reinhard |
author_sort |
Coulombe, Stéphanie |
title |
Contrasted geomorphological and limnological properties of thermokarst lakes formed in buried glacier ice and ice-wedge polygon terrain. |
title_short |
Contrasted geomorphological and limnological properties of thermokarst lakes formed in buried glacier ice and ice-wedge polygon terrain. |
title_full |
Contrasted geomorphological and limnological properties of thermokarst lakes formed in buried glacier ice and ice-wedge polygon terrain. |
title_fullStr |
Contrasted geomorphological and limnological properties of thermokarst lakes formed in buried glacier ice and ice-wedge polygon terrain. |
title_full_unstemmed |
Contrasted geomorphological and limnological properties of thermokarst lakes formed in buried glacier ice and ice-wedge polygon terrain. |
title_sort |
contrasted geomorphological and limnological properties of thermokarst lakes formed in buried glacier ice and ice-wedge polygon terrain. |
publishDate |
2022 |
url |
https://espace.inrs.ca/id/eprint/13068/ https://espace.inrs.ca/id/eprint/13068/1/P4041.pdf https://doi.org/10.5194/tc-16-2837-2022 |
geographic |
Arctic Nunavut Bylot Island |
geographic_facet |
Arctic Nunavut Bylot Island |
genre |
Arctic Bylot Island Global warming Ice Nunavut permafrost The Cryosphere Thermokarst wedge* |
genre_facet |
Arctic Bylot Island Global warming Ice Nunavut permafrost The Cryosphere Thermokarst wedge* |
op_relation |
https://espace.inrs.ca/id/eprint/13068/1/P4041.pdf Coulombe, Stéphanie, Fortier, Daniel, Bouchard, Frédéric, Paquette, Michel, Charbonneau, Simon, Lacelle, Denis, Laurion, Isabelle orcid:0000-0001-8694-3330 et Pienitz, Reinhard (2022). Contrasted geomorphological and limnological properties of thermokarst lakes formed in buried glacier ice and ice-wedge polygon terrain. The Cryosphere , vol. 16 , nº 7. p. 2837-2857. DOI:10.5194/tc-16-2837-2022 <https://doi.org/10.5194/tc-16-2837-2022>. doi:10.5194/tc-16-2837-2022 |
op_doi |
https://doi.org/10.5194/tc-16-2837-2022 |
container_title |
The Cryosphere |
container_volume |
16 |
container_issue |
7 |
container_start_page |
2837 |
op_container_end_page |
2857 |
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1766335698227429376 |