Origin of the southernmost Arctic tundra of continental North America
The Arctic tundra extends beyond the treeline north of 58°N in eastern North America and north of 66°N in western North America and Eurasia. A marked exception to this distribution is the azonal tundra situated as far south as 54°30′–45′N, in the Pointe-Louis-XIV area (JABA), along the fast-rising c...
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Canadian Science Publishing
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crcansciencepubl:10.1139/as-2018-0007 2024-04-28T08:03:53+00:00 Origin of the southernmost Arctic tundra of continental North America Payette, Serge Pilon, Vanessa Frégeau, Mathieu 2018 http://dx.doi.org/10.1139/as-2018-0007 https://cdnsciencepub.com/doi/full-xml/10.1139/as-2018-0007 https://cdnsciencepub.com/doi/pdf/10.1139/as-2018-0007 en eng Canadian Science Publishing http://www.nrcresearchpress.com/page/about/CorporateTextAndDataMining Arctic Science volume 4, issue 4, page 794-812 ISSN 2368-7460 2368-7460 General Earth and Planetary Sciences General Agricultural and Biological Sciences General Environmental Science journal-article 2018 crcansciencepubl https://doi.org/10.1139/as-2018-0007 2024-04-02T06:55:52Z The Arctic tundra extends beyond the treeline north of 58°N in eastern North America and north of 66°N in western North America and Eurasia. A marked exception to this distribution is the azonal tundra situated as far south as 54°30′–45′N, in the Pointe-Louis-XIV area (JABA), along the fast-rising coasts of James Bay–Hudson Bay. The unusual position of JABA calls into question the influence of climate as the main causal factor for its existence. Macrocharcoal remains extracted from tundra and forest soils were used along a 105 km transect to date the onset of the boreal environment based on past occurrence of conifer fires. Assuming crustal uplift 1.3 m 100 year −1 and 2.4 m 100 year −1 over and before the last 1000 years, and after correcting site elevation at the time the oldest conifer fires occurred, trees established along the coast before 4000 cal. BP. Given charcoal distribution suggesting boreal vegetation in sites ≤13 m a.s.l., JABA was created after 4000 cal. BP when the flat, elongated peninsula emerged above marine waters. It is concluded that JABA origin was most likely caused by the synergistic impact of geophysical factors, isostatic uplift and topography, on a coastal environment already influenced by cold, wind-exposed conditions. Article in Journal/Newspaper Arctic Arctic Hudson Bay Tundra James Bay Canadian Science Publishing Arctic Science 4 4 794 812 |
institution |
Open Polar |
collection |
Canadian Science Publishing |
op_collection_id |
crcansciencepubl |
language |
English |
topic |
General Earth and Planetary Sciences General Agricultural and Biological Sciences General Environmental Science |
spellingShingle |
General Earth and Planetary Sciences General Agricultural and Biological Sciences General Environmental Science Payette, Serge Pilon, Vanessa Frégeau, Mathieu Origin of the southernmost Arctic tundra of continental North America |
topic_facet |
General Earth and Planetary Sciences General Agricultural and Biological Sciences General Environmental Science |
description |
The Arctic tundra extends beyond the treeline north of 58°N in eastern North America and north of 66°N in western North America and Eurasia. A marked exception to this distribution is the azonal tundra situated as far south as 54°30′–45′N, in the Pointe-Louis-XIV area (JABA), along the fast-rising coasts of James Bay–Hudson Bay. The unusual position of JABA calls into question the influence of climate as the main causal factor for its existence. Macrocharcoal remains extracted from tundra and forest soils were used along a 105 km transect to date the onset of the boreal environment based on past occurrence of conifer fires. Assuming crustal uplift 1.3 m 100 year −1 and 2.4 m 100 year −1 over and before the last 1000 years, and after correcting site elevation at the time the oldest conifer fires occurred, trees established along the coast before 4000 cal. BP. Given charcoal distribution suggesting boreal vegetation in sites ≤13 m a.s.l., JABA was created after 4000 cal. BP when the flat, elongated peninsula emerged above marine waters. It is concluded that JABA origin was most likely caused by the synergistic impact of geophysical factors, isostatic uplift and topography, on a coastal environment already influenced by cold, wind-exposed conditions. |
format |
Article in Journal/Newspaper |
author |
Payette, Serge Pilon, Vanessa Frégeau, Mathieu |
author_facet |
Payette, Serge Pilon, Vanessa Frégeau, Mathieu |
author_sort |
Payette, Serge |
title |
Origin of the southernmost Arctic tundra of continental North America |
title_short |
Origin of the southernmost Arctic tundra of continental North America |
title_full |
Origin of the southernmost Arctic tundra of continental North America |
title_fullStr |
Origin of the southernmost Arctic tundra of continental North America |
title_full_unstemmed |
Origin of the southernmost Arctic tundra of continental North America |
title_sort |
origin of the southernmost arctic tundra of continental north america |
publisher |
Canadian Science Publishing |
publishDate |
2018 |
url |
http://dx.doi.org/10.1139/as-2018-0007 https://cdnsciencepub.com/doi/full-xml/10.1139/as-2018-0007 https://cdnsciencepub.com/doi/pdf/10.1139/as-2018-0007 |
genre |
Arctic Arctic Hudson Bay Tundra James Bay |
genre_facet |
Arctic Arctic Hudson Bay Tundra James Bay |
op_source |
Arctic Science volume 4, issue 4, page 794-812 ISSN 2368-7460 2368-7460 |
op_rights |
http://www.nrcresearchpress.com/page/about/CorporateTextAndDataMining |
op_doi |
https://doi.org/10.1139/as-2018-0007 |
container_title |
Arctic Science |
container_volume |
4 |
container_issue |
4 |
container_start_page |
794 |
op_container_end_page |
812 |
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1797574864551280640 |