Sedimentology and geochemistry of thermokarst ponds in discontinuous permafrost, subarctic Quebec, Canada.
Thermokarst (thaw) ponds and lakes are distributed throughout arctic and subarctic regions; however their natural variability and temporal evolution recorded in the bottom sediments are poorly understood. This paper presents a multiproxy study conducted in a subarctic site with many thermokarst pond...
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Online Access: | https://espace.inrs.ca/id/eprint/9436/ https://espace.inrs.ca/id/eprint/9436/1/P2010.pdf https://doi.org/10.1029/2011JG001675 |
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ftinrsquebec:oai:espace.inrs.ca:9436 2023-05-15T15:07:48+02:00 Sedimentology and geochemistry of thermokarst ponds in discontinuous permafrost, subarctic Quebec, Canada. Bouchard, Frédéric Francus, Pierre Pienitz, Reinhard Laurion, Isabelle 2011 application/pdf https://espace.inrs.ca/id/eprint/9436/ https://espace.inrs.ca/id/eprint/9436/1/P2010.pdf https://doi.org/10.1029/2011JG001675 en eng https://espace.inrs.ca/id/eprint/9436/1/P2010.pdf Bouchard, Frédéric, Francus, Pierre, Pienitz, Reinhard et Laurion, Isabelle (2011). Sedimentology and geochemistry of thermokarst ponds in discontinuous permafrost, subarctic Quebec, Canada. Journal of Geophysical Research , vol. 116 , nº G2. DOI:10.1029/2011JG001675 <https://doi.org/10.1029/2011JG001675>. doi:10.1029/2011JG001675 Holocene lithalsas palsas permafrost subarctic Quebec thermokarst ponds Article Évalué par les pairs 2011 ftinrsquebec https://doi.org/10.1029/2011JG001675 2023-02-10T11:45:37Z Thermokarst (thaw) ponds and lakes are distributed throughout arctic and subarctic regions; however their natural variability and temporal evolution recorded in the bottom sediments are poorly understood. This paper presents a multiproxy study conducted in a subarctic site with many thermokarst ponds near Kuujjuarapik‐Whapmagoostui, on the eastern shore of Hudson Bay. Sedimentological, geochemical and chronological analyses have been performed on short sediment cores (10–20 cm) retrieved from limnologically contrasted ponds. Analyses revealed two distinct sedimentary facies, from bottom to top: 1) massive marine silts and clays deposited during postglacial Tyrrell Sea transgression (ca. 8000 to 6000 cal yr BP), subsequently emerged by glacio‐isostatic rebound and more recently (ca. 1500 to 400 cal yr BP) affected by permafrost inception and growth; 2) laminated organic‐rich lacustrine muds deposited since permafrost thawing and subsidence, i.e., since thermokarst pond inception (the last centuries). Despite displaying strikingly different water colors, the study ponds showed similar long‐term developmental patterns regarding their physico‐chemical properties (as recorded in the sediments), such as decreasing mineral grain size (from silts to clays), decreasing major chemical element concentrations, increasing organic matter content, and decreasing bottom water oxygen concentrations (from well‐oxygenated to anoxic/hypoxic conditions). Article in Journal/Newspaper Arctic Hudson Bay Kuujjuarapik palsas permafrost Subarctic Thermokarst Institut national de la recherche scientifique, Québec: Espace INRS Arctic Hudson Bay Canada Hudson Tyrrell ENVELOPE(-69.512,-69.512,-69.634,-69.634) Kuujjuarapik ENVELOPE(-77.762,-77.762,55.276,55.276) Whapmagoostui ENVELOPE(-77.750,-77.750,55.250,55.250) Journal of Geophysical Research 116 |
institution |
Open Polar |
collection |
Institut national de la recherche scientifique, Québec: Espace INRS |
op_collection_id |
ftinrsquebec |
language |
English |
topic |
Holocene lithalsas palsas permafrost subarctic Quebec thermokarst ponds |
spellingShingle |
Holocene lithalsas palsas permafrost subarctic Quebec thermokarst ponds Bouchard, Frédéric Francus, Pierre Pienitz, Reinhard Laurion, Isabelle Sedimentology and geochemistry of thermokarst ponds in discontinuous permafrost, subarctic Quebec, Canada. |
topic_facet |
Holocene lithalsas palsas permafrost subarctic Quebec thermokarst ponds |
description |
Thermokarst (thaw) ponds and lakes are distributed throughout arctic and subarctic regions; however their natural variability and temporal evolution recorded in the bottom sediments are poorly understood. This paper presents a multiproxy study conducted in a subarctic site with many thermokarst ponds near Kuujjuarapik‐Whapmagoostui, on the eastern shore of Hudson Bay. Sedimentological, geochemical and chronological analyses have been performed on short sediment cores (10–20 cm) retrieved from limnologically contrasted ponds. Analyses revealed two distinct sedimentary facies, from bottom to top: 1) massive marine silts and clays deposited during postglacial Tyrrell Sea transgression (ca. 8000 to 6000 cal yr BP), subsequently emerged by glacio‐isostatic rebound and more recently (ca. 1500 to 400 cal yr BP) affected by permafrost inception and growth; 2) laminated organic‐rich lacustrine muds deposited since permafrost thawing and subsidence, i.e., since thermokarst pond inception (the last centuries). Despite displaying strikingly different water colors, the study ponds showed similar long‐term developmental patterns regarding their physico‐chemical properties (as recorded in the sediments), such as decreasing mineral grain size (from silts to clays), decreasing major chemical element concentrations, increasing organic matter content, and decreasing bottom water oxygen concentrations (from well‐oxygenated to anoxic/hypoxic conditions). |
format |
Article in Journal/Newspaper |
author |
Bouchard, Frédéric Francus, Pierre Pienitz, Reinhard Laurion, Isabelle |
author_facet |
Bouchard, Frédéric Francus, Pierre Pienitz, Reinhard Laurion, Isabelle |
author_sort |
Bouchard, Frédéric |
title |
Sedimentology and geochemistry of thermokarst ponds in discontinuous permafrost, subarctic Quebec, Canada. |
title_short |
Sedimentology and geochemistry of thermokarst ponds in discontinuous permafrost, subarctic Quebec, Canada. |
title_full |
Sedimentology and geochemistry of thermokarst ponds in discontinuous permafrost, subarctic Quebec, Canada. |
title_fullStr |
Sedimentology and geochemistry of thermokarst ponds in discontinuous permafrost, subarctic Quebec, Canada. |
title_full_unstemmed |
Sedimentology and geochemistry of thermokarst ponds in discontinuous permafrost, subarctic Quebec, Canada. |
title_sort |
sedimentology and geochemistry of thermokarst ponds in discontinuous permafrost, subarctic quebec, canada. |
publishDate |
2011 |
url |
https://espace.inrs.ca/id/eprint/9436/ https://espace.inrs.ca/id/eprint/9436/1/P2010.pdf https://doi.org/10.1029/2011JG001675 |
long_lat |
ENVELOPE(-69.512,-69.512,-69.634,-69.634) ENVELOPE(-77.762,-77.762,55.276,55.276) ENVELOPE(-77.750,-77.750,55.250,55.250) |
geographic |
Arctic Hudson Bay Canada Hudson Tyrrell Kuujjuarapik Whapmagoostui |
geographic_facet |
Arctic Hudson Bay Canada Hudson Tyrrell Kuujjuarapik Whapmagoostui |
genre |
Arctic Hudson Bay Kuujjuarapik palsas permafrost Subarctic Thermokarst |
genre_facet |
Arctic Hudson Bay Kuujjuarapik palsas permafrost Subarctic Thermokarst |
op_relation |
https://espace.inrs.ca/id/eprint/9436/1/P2010.pdf Bouchard, Frédéric, Francus, Pierre, Pienitz, Reinhard et Laurion, Isabelle (2011). Sedimentology and geochemistry of thermokarst ponds in discontinuous permafrost, subarctic Quebec, Canada. Journal of Geophysical Research , vol. 116 , nº G2. DOI:10.1029/2011JG001675 <https://doi.org/10.1029/2011JG001675>. doi:10.1029/2011JG001675 |
op_doi |
https://doi.org/10.1029/2011JG001675 |
container_title |
Journal of Geophysical Research |
container_volume |
116 |
_version_ |
1766339225411649536 |