Climate-driven Holocene ecohydrological and carbon dynamics from maritime peatlands of the Gulf of St. Lawrence, eastern Canada
Anticosti Island, located in the Gulf of St. Lawrence (GSL; Quebec, Canada) is covered by ~25% peatland ecosystems, and conditions supporting their development remain poorly documented. We present the first reconstructions of the ecohydrological conditions (vegetation successions and water table var...
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crsagepubl:10.1177/09596836221095978 2024-05-19T07:36:40+00:00 Climate-driven Holocene ecohydrological and carbon dynamics from maritime peatlands of the Gulf of St. Lawrence, eastern Canada Perrier, Léonie Garneau, Michelle Pratte, Steve Sanderson, Nicole K Fonds de Recherche du Québec - Nature et Technologies Natural Sciences and Engineering Research Council of Canada 2022 http://dx.doi.org/10.1177/09596836221095978 http://journals.sagepub.com/doi/pdf/10.1177/09596836221095978 http://journals.sagepub.com/doi/full-xml/10.1177/09596836221095978 en eng SAGE Publications https://creativecommons.org/licenses/by/4.0/ The Holocene volume 32, issue 8, page 749-763 ISSN 0959-6836 1477-0911 journal-article 2022 crsagepubl https://doi.org/10.1177/09596836221095978 2024-04-25T08:12:14Z Anticosti Island, located in the Gulf of St. Lawrence (GSL; Quebec, Canada) is covered by ~25% peatland ecosystems, and conditions supporting their development remain poorly documented. We present the first reconstructions of the ecohydrological conditions (vegetation successions and water table variations) and related carbon accumulation of two maritime peatlands (Pluvier; PLU and Pointe de l’Est; PTE) located on the eastern part of Anticosti Island. These ombrotrophic peatlands developed under the influence of the GSL sea-surface conditions in interaction with atmospheric circulation during the Holocene. Long-term apparent Rate of Carbon Accumulation (LORCA, g C m −2 a −1 ) at PLU (13.3) and PTE (16.8) are lower than the mean global value for northern peatlands (22.9), likely due to high wind exposure. Results show that despite the earlier peat inception at PLU (9440 cal a BP) before PTE (6250 cal a BP), the fen-bog transition of both peatlands occurred almost synchronously (4540 and 5070 cal a BP respectively), suggesting favourable hydroclimatic conditions for peat growth. A slowdown in peat accumulation combined with dry and variable hydrological conditions after ca. 3300 cal a BP in the two studied peatlands coincided with the transition from the mid-Holocene to the Neoglacial cooling. At ca. 800 cal a BP, the shift from wet Sphagnum to dry ligneous peat corresponds to the transition from the Medieval Climate Anomaly to the Little Ice Age. Cooling periods, characterized by a decrease in incident solar radiation and the incursion of cold and dry Arctic air masses into the GSL, are marked by a decrease in peat accumulation, especially at PLU, due to its higher wind exposure, which influenced reduced snow cover thickness as well as frost penetration and duration through the peat. Article in Journal/Newspaper Arctic SAGE Publications The Holocene 32 8 749 763 |
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SAGE Publications |
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English |
description |
Anticosti Island, located in the Gulf of St. Lawrence (GSL; Quebec, Canada) is covered by ~25% peatland ecosystems, and conditions supporting their development remain poorly documented. We present the first reconstructions of the ecohydrological conditions (vegetation successions and water table variations) and related carbon accumulation of two maritime peatlands (Pluvier; PLU and Pointe de l’Est; PTE) located on the eastern part of Anticosti Island. These ombrotrophic peatlands developed under the influence of the GSL sea-surface conditions in interaction with atmospheric circulation during the Holocene. Long-term apparent Rate of Carbon Accumulation (LORCA, g C m −2 a −1 ) at PLU (13.3) and PTE (16.8) are lower than the mean global value for northern peatlands (22.9), likely due to high wind exposure. Results show that despite the earlier peat inception at PLU (9440 cal a BP) before PTE (6250 cal a BP), the fen-bog transition of both peatlands occurred almost synchronously (4540 and 5070 cal a BP respectively), suggesting favourable hydroclimatic conditions for peat growth. A slowdown in peat accumulation combined with dry and variable hydrological conditions after ca. 3300 cal a BP in the two studied peatlands coincided with the transition from the mid-Holocene to the Neoglacial cooling. At ca. 800 cal a BP, the shift from wet Sphagnum to dry ligneous peat corresponds to the transition from the Medieval Climate Anomaly to the Little Ice Age. Cooling periods, characterized by a decrease in incident solar radiation and the incursion of cold and dry Arctic air masses into the GSL, are marked by a decrease in peat accumulation, especially at PLU, due to its higher wind exposure, which influenced reduced snow cover thickness as well as frost penetration and duration through the peat. |
author2 |
Fonds de Recherche du Québec - Nature et Technologies Natural Sciences and Engineering Research Council of Canada |
format |
Article in Journal/Newspaper |
author |
Perrier, Léonie Garneau, Michelle Pratte, Steve Sanderson, Nicole K |
spellingShingle |
Perrier, Léonie Garneau, Michelle Pratte, Steve Sanderson, Nicole K Climate-driven Holocene ecohydrological and carbon dynamics from maritime peatlands of the Gulf of St. Lawrence, eastern Canada |
author_facet |
Perrier, Léonie Garneau, Michelle Pratte, Steve Sanderson, Nicole K |
author_sort |
Perrier, Léonie |
title |
Climate-driven Holocene ecohydrological and carbon dynamics from maritime peatlands of the Gulf of St. Lawrence, eastern Canada |
title_short |
Climate-driven Holocene ecohydrological and carbon dynamics from maritime peatlands of the Gulf of St. Lawrence, eastern Canada |
title_full |
Climate-driven Holocene ecohydrological and carbon dynamics from maritime peatlands of the Gulf of St. Lawrence, eastern Canada |
title_fullStr |
Climate-driven Holocene ecohydrological and carbon dynamics from maritime peatlands of the Gulf of St. Lawrence, eastern Canada |
title_full_unstemmed |
Climate-driven Holocene ecohydrological and carbon dynamics from maritime peatlands of the Gulf of St. Lawrence, eastern Canada |
title_sort |
climate-driven holocene ecohydrological and carbon dynamics from maritime peatlands of the gulf of st. lawrence, eastern canada |
publisher |
SAGE Publications |
publishDate |
2022 |
url |
http://dx.doi.org/10.1177/09596836221095978 http://journals.sagepub.com/doi/pdf/10.1177/09596836221095978 http://journals.sagepub.com/doi/full-xml/10.1177/09596836221095978 |
genre |
Arctic |
genre_facet |
Arctic |
op_source |
The Holocene volume 32, issue 8, page 749-763 ISSN 0959-6836 1477-0911 |
op_rights |
https://creativecommons.org/licenses/by/4.0/ |
op_doi |
https://doi.org/10.1177/09596836221095978 |
container_title |
The Holocene |
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32 |
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8 |
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749 |
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763 |
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1799475809193295872 |