Impact of the Little Ice Age cooling and 20th century climate change on peatland vegetation dynamics in central and northern Alberta using a multi-proxy approach and high-resolution peat chronologies
Northern boreal peatlands are major terrestrial sinks of organic carbon and these ecosystems, which are highly sensitive to human activities and climate change, act as sensitive archives of past environmental change at various timescales. This study aims at understanding how the climate changes of t...
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2018
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Online Access: | http://archipel.uqam.ca/13659/1/manuscript_magnan_accepted.docx http://archipel.uqam.ca/13659/ https://doi.org/10.1016/j.quascirev.2018.01.015 |
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fttriple:oai:gotriple.eu:10670/1.dl82sy 2023-05-15T16:17:41+02:00 Impact of the Little Ice Age cooling and 20th century climate change on peatland vegetation dynamics in central and northern Alberta using a multi-proxy approach and high-resolution peat chronologies Magnan, Gabriel van Bellen, Simon Davies, Lauren Froese, Duane Garneau, Michelle Mullan-Boudreau, Gillian Zaccone, Claudio Shotyk, William 2018-04-01 http://archipel.uqam.ca/13659/1/manuscript_magnan_accepted.docx http://archipel.uqam.ca/13659/ https://doi.org/10.1016/j.quascirev.2018.01.015 en eng Magnan, Gabriel; van Bellen, Simon; Davies, Lauren; Froese, Duane; Garneau, Michelle; Mullan-Boudreau, Gillian; Zaccone, Claudio et Shotyk, William (2018). « Impact of the Little Ice Age cooling and 20th century climate change on peatland vegetation dynamics in central and northern Alberta using a multi-proxy approach and high-resolution peat chronologies ». Quaternary Science Reviews, 185, pp. 230-243. 10670/1.dl82sy http://archipel.uqam.ca/13659/1/manuscript_magnan_accepted.docx http://archipel.uqam.ca/13659/ http://dx.doi.org/10.1016/j.quascirev.2018.01.015 undefined UQAM Archipel : articles scientifiques envir geo Journal Article https://vocabularies.coar-repositories.org/resource_types/c_6501/ 2018 fttriple https://doi.org/10.1016/j.quascirev.2018.01.015 2023-01-22T16:53:49Z Northern boreal peatlands are major terrestrial sinks of organic carbon and these ecosystems, which are highly sensitive to human activities and climate change, act as sensitive archives of past environmental change at various timescales. This study aims at understanding how the climate changes of the last 1000 years have affected peatland vegetation dynamics in the boreal region of Alberta in western Canada. Peat cores were collected from five bogs in the Fort McMurray region (56–57° N), at the southern limit of sporadic permafrost, and two in central Alberta (53° N and 55° N) outside the present-day limit of permafrost peatlands. The past changes in vegetation communities were reconstructed using detailed plant macrofossil analyses combined with high-resolution peat chronologies (14C, atmospheric bomb-pulse 14C, 210Pb and cryptotephras). Peat humification proxies (C/N, H/C, bulk density) and records of pH and ash content were also used to improve the interpretation of climate-related vegetation changes. Our study shows important changes in peatland vegetation and physical and chemical peat properties during the Little Ice Age (LIA) cooling period mainly from around 1700 CE and the subsequent climate warming of the 20th century. In some bogs, the plant macrofossils have recorded periods of permafrost aggradation during the LIA with drier surface conditions, increased peat humification and high abundance of ericaceous shrubs and black spruce (Picea mariana). The subsequent permafrost thaw was characterized by a short-term shift towards wetter conditions (Sphagnum sect. Cuspidata) and a decline in Picea mariana. Finally, a shift to a dominance of Sphagnum sect. Acutifolia (mainly Sphagnum fuscum) occurred in all the bogs during the second half of the 20th century, indicating the establishment of dry ombrotrophic conditions under the recent warmer and drier climate conditions. Article in Journal/Newspaper Fort McMurray Ice permafrost Unknown Canada Fort McMurray Quaternary Science Reviews 185 230 243 |
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envir geo |
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envir geo Magnan, Gabriel van Bellen, Simon Davies, Lauren Froese, Duane Garneau, Michelle Mullan-Boudreau, Gillian Zaccone, Claudio Shotyk, William Impact of the Little Ice Age cooling and 20th century climate change on peatland vegetation dynamics in central and northern Alberta using a multi-proxy approach and high-resolution peat chronologies |
topic_facet |
envir geo |
description |
Northern boreal peatlands are major terrestrial sinks of organic carbon and these ecosystems, which are highly sensitive to human activities and climate change, act as sensitive archives of past environmental change at various timescales. This study aims at understanding how the climate changes of the last 1000 years have affected peatland vegetation dynamics in the boreal region of Alberta in western Canada. Peat cores were collected from five bogs in the Fort McMurray region (56–57° N), at the southern limit of sporadic permafrost, and two in central Alberta (53° N and 55° N) outside the present-day limit of permafrost peatlands. The past changes in vegetation communities were reconstructed using detailed plant macrofossil analyses combined with high-resolution peat chronologies (14C, atmospheric bomb-pulse 14C, 210Pb and cryptotephras). Peat humification proxies (C/N, H/C, bulk density) and records of pH and ash content were also used to improve the interpretation of climate-related vegetation changes. Our study shows important changes in peatland vegetation and physical and chemical peat properties during the Little Ice Age (LIA) cooling period mainly from around 1700 CE and the subsequent climate warming of the 20th century. In some bogs, the plant macrofossils have recorded periods of permafrost aggradation during the LIA with drier surface conditions, increased peat humification and high abundance of ericaceous shrubs and black spruce (Picea mariana). The subsequent permafrost thaw was characterized by a short-term shift towards wetter conditions (Sphagnum sect. Cuspidata) and a decline in Picea mariana. Finally, a shift to a dominance of Sphagnum sect. Acutifolia (mainly Sphagnum fuscum) occurred in all the bogs during the second half of the 20th century, indicating the establishment of dry ombrotrophic conditions under the recent warmer and drier climate conditions. |
format |
Article in Journal/Newspaper |
author |
Magnan, Gabriel van Bellen, Simon Davies, Lauren Froese, Duane Garneau, Michelle Mullan-Boudreau, Gillian Zaccone, Claudio Shotyk, William |
author_facet |
Magnan, Gabriel van Bellen, Simon Davies, Lauren Froese, Duane Garneau, Michelle Mullan-Boudreau, Gillian Zaccone, Claudio Shotyk, William |
author_sort |
Magnan, Gabriel |
title |
Impact of the Little Ice Age cooling and 20th century climate change on peatland vegetation dynamics in central and northern Alberta using a multi-proxy approach and high-resolution peat chronologies |
title_short |
Impact of the Little Ice Age cooling and 20th century climate change on peatland vegetation dynamics in central and northern Alberta using a multi-proxy approach and high-resolution peat chronologies |
title_full |
Impact of the Little Ice Age cooling and 20th century climate change on peatland vegetation dynamics in central and northern Alberta using a multi-proxy approach and high-resolution peat chronologies |
title_fullStr |
Impact of the Little Ice Age cooling and 20th century climate change on peatland vegetation dynamics in central and northern Alberta using a multi-proxy approach and high-resolution peat chronologies |
title_full_unstemmed |
Impact of the Little Ice Age cooling and 20th century climate change on peatland vegetation dynamics in central and northern Alberta using a multi-proxy approach and high-resolution peat chronologies |
title_sort |
impact of the little ice age cooling and 20th century climate change on peatland vegetation dynamics in central and northern alberta using a multi-proxy approach and high-resolution peat chronologies |
publishDate |
2018 |
url |
http://archipel.uqam.ca/13659/1/manuscript_magnan_accepted.docx http://archipel.uqam.ca/13659/ https://doi.org/10.1016/j.quascirev.2018.01.015 |
geographic |
Canada Fort McMurray |
geographic_facet |
Canada Fort McMurray |
genre |
Fort McMurray Ice permafrost |
genre_facet |
Fort McMurray Ice permafrost |
op_source |
UQAM Archipel : articles scientifiques |
op_relation |
Magnan, Gabriel; van Bellen, Simon; Davies, Lauren; Froese, Duane; Garneau, Michelle; Mullan-Boudreau, Gillian; Zaccone, Claudio et Shotyk, William (2018). « Impact of the Little Ice Age cooling and 20th century climate change on peatland vegetation dynamics in central and northern Alberta using a multi-proxy approach and high-resolution peat chronologies ». Quaternary Science Reviews, 185, pp. 230-243. 10670/1.dl82sy http://archipel.uqam.ca/13659/1/manuscript_magnan_accepted.docx http://archipel.uqam.ca/13659/ http://dx.doi.org/10.1016/j.quascirev.2018.01.015 |
op_rights |
undefined |
op_doi |
https://doi.org/10.1016/j.quascirev.2018.01.015 |
container_title |
Quaternary Science Reviews |
container_volume |
185 |
container_start_page |
230 |
op_container_end_page |
243 |
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1766003575385751552 |