Carbon Cycling in Permafrost Aquatic Systems of Bylot Island, Eastern Canadian Arctic.
Aquatic systems are widespread in permafrost environments and play a crucial role in biogeochemical cycles, especially in GHG emissions (CO2, CH4). Amount, rate and age of carbon released from permafrost thawing can be strongly influenced by local geomorphology, which affects the biogeochemical dyna...
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ftinrsquebec:oai:espace.inrs.ca:3546 2023-05-15T14:24:04+02:00 Carbon Cycling in Permafrost Aquatic Systems of Bylot Island, Eastern Canadian Arctic. Bouchard, Frédéric Préskienis, Vilmantas Laurion, Isabelle Fortier, Daniel 2014 https://espace.inrs.ca/id/eprint/3546/ http://adsabs.harvard.edu/abs/2014AGUFM.B33G.08B unknown Bouchard, Frédéric, Préskienis, Vilmantas, Laurion, Isabelle et Fortier, Daniel (2014). Carbon Cycling in Permafrost Aquatic Systems of Bylot Island, Eastern Canadian Arctic. In: AGU Fall Meeting 2014, 15-19 décembre 2014, San Francisco, États-Unis. biogeochemical cycles carbon cycling limnology permafrost cryosphere Document issu d'une conférence ou d'un atelier Non évalué par les pairs 2014 ftinrsquebec 2023-02-10T11:42:31Z Aquatic systems are widespread in permafrost environments and play a crucial role in biogeochemical cycles, especially in GHG emissions (CO2, CH4). Amount, rate and age of carbon released from permafrost thawing can be strongly influenced by local geomorphology, which affects the biogeochemical dynamics of ponds and lakes. Bylot Island (Nunavut) is located in the heart of the Eastern Canadian Arctic and comprises numerous glacial and periglacial aquatic landscapes. Several glacial valleys of the island represent highly dynamic biogeosystems rich in permafrost ground ice, peat, and aquatic environments. We aimed at characterizing the influence of geomorphology and permafrost degradation processes on aquatic system biogeochemistry. We sampled gas, water, permafrost and lacustrine sediment in different types of aquatic systems: polygonal ponds, collapsed ice-wedge trough ponds, and larger lakes overlying unfrozen soil ('talik'). Preliminary results and field observations indicate a relationship between pond/lake morphology, processes of permafrost degradation, and the age of carbon processed - ultimately released as GHG - in these aquatic systems. Small and shallow ponds produced modern or young (< 500 yr BP) CO2 and CH4, whereas larger and deeper lakes released older (< 2000 yr BP) gases. We also observed a substantial difference in gas fluxes between similar ponds of comparable size and depth. When pond margins were actively eroding (eroded and collapsed peat blocks), fluxes were several orders of magnitude higher than when their margins were stabilized. Such findings underscore the strong impact of local geomorphology and permafrost degradation processes on aquatic system biogeochemistry. Upscaling of GHG emissions at the watershed scale requires a better understanding of the emissions from different types of ecosystems. Other/Unknown Material Arctic Arctic Bylot Island Ice Nunavut permafrost wedge* Institut national de la recherche scientifique, Québec: Espace INRS Arctic Nunavut Bylot Island Talik ENVELOPE(146.601,146.601,59.667,59.667) Pond Lake ENVELOPE(-126.692,-126.692,56.046,56.046) |
institution |
Open Polar |
collection |
Institut national de la recherche scientifique, Québec: Espace INRS |
op_collection_id |
ftinrsquebec |
language |
unknown |
topic |
biogeochemical cycles carbon cycling limnology permafrost cryosphere |
spellingShingle |
biogeochemical cycles carbon cycling limnology permafrost cryosphere Bouchard, Frédéric Préskienis, Vilmantas Laurion, Isabelle Fortier, Daniel Carbon Cycling in Permafrost Aquatic Systems of Bylot Island, Eastern Canadian Arctic. |
topic_facet |
biogeochemical cycles carbon cycling limnology permafrost cryosphere |
description |
Aquatic systems are widespread in permafrost environments and play a crucial role in biogeochemical cycles, especially in GHG emissions (CO2, CH4). Amount, rate and age of carbon released from permafrost thawing can be strongly influenced by local geomorphology, which affects the biogeochemical dynamics of ponds and lakes. Bylot Island (Nunavut) is located in the heart of the Eastern Canadian Arctic and comprises numerous glacial and periglacial aquatic landscapes. Several glacial valleys of the island represent highly dynamic biogeosystems rich in permafrost ground ice, peat, and aquatic environments. We aimed at characterizing the influence of geomorphology and permafrost degradation processes on aquatic system biogeochemistry. We sampled gas, water, permafrost and lacustrine sediment in different types of aquatic systems: polygonal ponds, collapsed ice-wedge trough ponds, and larger lakes overlying unfrozen soil ('talik'). Preliminary results and field observations indicate a relationship between pond/lake morphology, processes of permafrost degradation, and the age of carbon processed - ultimately released as GHG - in these aquatic systems. Small and shallow ponds produced modern or young (< 500 yr BP) CO2 and CH4, whereas larger and deeper lakes released older (< 2000 yr BP) gases. We also observed a substantial difference in gas fluxes between similar ponds of comparable size and depth. When pond margins were actively eroding (eroded and collapsed peat blocks), fluxes were several orders of magnitude higher than when their margins were stabilized. Such findings underscore the strong impact of local geomorphology and permafrost degradation processes on aquatic system biogeochemistry. Upscaling of GHG emissions at the watershed scale requires a better understanding of the emissions from different types of ecosystems. |
format |
Other/Unknown Material |
author |
Bouchard, Frédéric Préskienis, Vilmantas Laurion, Isabelle Fortier, Daniel |
author_facet |
Bouchard, Frédéric Préskienis, Vilmantas Laurion, Isabelle Fortier, Daniel |
author_sort |
Bouchard, Frédéric |
title |
Carbon Cycling in Permafrost Aquatic Systems of Bylot Island, Eastern Canadian Arctic. |
title_short |
Carbon Cycling in Permafrost Aquatic Systems of Bylot Island, Eastern Canadian Arctic. |
title_full |
Carbon Cycling in Permafrost Aquatic Systems of Bylot Island, Eastern Canadian Arctic. |
title_fullStr |
Carbon Cycling in Permafrost Aquatic Systems of Bylot Island, Eastern Canadian Arctic. |
title_full_unstemmed |
Carbon Cycling in Permafrost Aquatic Systems of Bylot Island, Eastern Canadian Arctic. |
title_sort |
carbon cycling in permafrost aquatic systems of bylot island, eastern canadian arctic. |
publishDate |
2014 |
url |
https://espace.inrs.ca/id/eprint/3546/ http://adsabs.harvard.edu/abs/2014AGUFM.B33G.08B |
long_lat |
ENVELOPE(146.601,146.601,59.667,59.667) ENVELOPE(-126.692,-126.692,56.046,56.046) |
geographic |
Arctic Nunavut Bylot Island Talik Pond Lake |
geographic_facet |
Arctic Nunavut Bylot Island Talik Pond Lake |
genre |
Arctic Arctic Bylot Island Ice Nunavut permafrost wedge* |
genre_facet |
Arctic Arctic Bylot Island Ice Nunavut permafrost wedge* |
op_relation |
Bouchard, Frédéric, Préskienis, Vilmantas, Laurion, Isabelle et Fortier, Daniel (2014). Carbon Cycling in Permafrost Aquatic Systems of Bylot Island, Eastern Canadian Arctic. In: AGU Fall Meeting 2014, 15-19 décembre 2014, San Francisco, États-Unis. |
_version_ |
1766296523401854976 |