Postglacial Vegetational History of the Eastern Avalon Peninsula, Newfoundland, and Holocene Climatic Change Along the Eastern Canadian Seaboard
Two radiocarbon-dated pollen profiles from the eastern Avalon Peninsula suggest late déglaciation (probably no earlier than 9700 BP at the coast), followed by a brief period of tundra vegetation. After 9300 BP a rich shrub tundra at lower elevations was invaded by spruce, balsam fir and tree birch u...
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Les Presses de l'Université de Montréal
1982
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Online Access: | http://id.erudit.org/iderudit/032476ar https://doi.org/10.7202/032476ar |
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fterudit:oai:erudit.org:032476ar 2023-05-15T15:35:29+02:00 Postglacial Vegetational History of the Eastern Avalon Peninsula, Newfoundland, and Holocene Climatic Change Along the Eastern Canadian Seaboard Brown Macpherson, Joyce 1982 http://id.erudit.org/iderudit/032476ar https://doi.org/10.7202/032476ar en eng Les Presses de l'Université de Montréal Érudit Géographie physique et Quaternaire vol. 36 no. 1-2 (1982) http://id.erudit.org/iderudit/032476ar doi:10.7202/032476ar Tous droits réservés © Les Presses de l'Université de Montréal, 1982 text 1982 fterudit https://doi.org/10.7202/032476ar 2022-09-24T23:13:34Z Two radiocarbon-dated pollen profiles from the eastern Avalon Peninsula suggest late déglaciation (probably no earlier than 9700 BP at the coast), followed by a brief period of tundra vegetation. After 9300 BP a rich shrub tundra at lower elevations was invaded by spruce, balsam fir and tree birch until at ca 8400 BP the vegetation was an open woodland. The forest remained open for the next 3000 years; evidence of fire and the continuous presence of Populus suggest drier and warmer conditions than at present. The period of maximum warmth, ca 5400-3200 BP, saw the closing of the forest cover, a rise in the level of the tree limit in the interior upland and an increase in precipitation. After 3200 BP decreasing temperatures resulted in a lowering of the tree limit. The climatic changes inferred for the Avalon Peninsula are compared with those inferred from palaeo-environmental studies along the eastern North American seaboard from Baffin Island to New England. A sequence of changing controls on the regional atmospheric circulation during the Holocene is suggested. Deux profils polliniques dressés à partir de données recueillis dans la péninsule d'Avalon orientale, et datés au 14C, nous portent à supposer qu'il y eut là une déglaciation tardive (probablement après 9700 BP sur le littoral) suivie d'une courte période marquée par la croissance d'une végétation de toundra. Après 9300 BP, la riche toundra arbustive fut colonisée, dans les endroits peu élevés, par l'épinette, le sapin baumier et le bouleau arborescent jusqu'à former, vers 8400 BP, une forêt clairsemée. La forêt conserva ce caractère au cours des 3000 ans qui suivirent. Des traces d'incendies et la constance de la présence de Populus font penser que le climat était alors plus sec et plus chaud qu'aujourd'hui. Au maximun climatique, environ entre 5400 et 3200 BP, correspondit une densification du couvert forestier, une remontée de la limite de la forêt jusque sur les hautes terres et une augmentation des précipitations. Après 3200 BP, le refroidissement ... Text Baffin Island Baffin Newfoundland toundra Tundra Érudit.org (Université Montréal) Baffin Island Géographie physique et Quaternaire 36 1-2 175 196 |
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Open Polar |
collection |
Érudit.org (Université Montréal) |
op_collection_id |
fterudit |
language |
English |
description |
Two radiocarbon-dated pollen profiles from the eastern Avalon Peninsula suggest late déglaciation (probably no earlier than 9700 BP at the coast), followed by a brief period of tundra vegetation. After 9300 BP a rich shrub tundra at lower elevations was invaded by spruce, balsam fir and tree birch until at ca 8400 BP the vegetation was an open woodland. The forest remained open for the next 3000 years; evidence of fire and the continuous presence of Populus suggest drier and warmer conditions than at present. The period of maximum warmth, ca 5400-3200 BP, saw the closing of the forest cover, a rise in the level of the tree limit in the interior upland and an increase in precipitation. After 3200 BP decreasing temperatures resulted in a lowering of the tree limit. The climatic changes inferred for the Avalon Peninsula are compared with those inferred from palaeo-environmental studies along the eastern North American seaboard from Baffin Island to New England. A sequence of changing controls on the regional atmospheric circulation during the Holocene is suggested. Deux profils polliniques dressés à partir de données recueillis dans la péninsule d'Avalon orientale, et datés au 14C, nous portent à supposer qu'il y eut là une déglaciation tardive (probablement après 9700 BP sur le littoral) suivie d'une courte période marquée par la croissance d'une végétation de toundra. Après 9300 BP, la riche toundra arbustive fut colonisée, dans les endroits peu élevés, par l'épinette, le sapin baumier et le bouleau arborescent jusqu'à former, vers 8400 BP, une forêt clairsemée. La forêt conserva ce caractère au cours des 3000 ans qui suivirent. Des traces d'incendies et la constance de la présence de Populus font penser que le climat était alors plus sec et plus chaud qu'aujourd'hui. Au maximun climatique, environ entre 5400 et 3200 BP, correspondit une densification du couvert forestier, une remontée de la limite de la forêt jusque sur les hautes terres et une augmentation des précipitations. Après 3200 BP, le refroidissement ... |
format |
Text |
author |
Brown Macpherson, Joyce |
spellingShingle |
Brown Macpherson, Joyce Postglacial Vegetational History of the Eastern Avalon Peninsula, Newfoundland, and Holocene Climatic Change Along the Eastern Canadian Seaboard |
author_facet |
Brown Macpherson, Joyce |
author_sort |
Brown Macpherson, Joyce |
title |
Postglacial Vegetational History of the Eastern Avalon Peninsula, Newfoundland, and Holocene Climatic Change Along the Eastern Canadian Seaboard |
title_short |
Postglacial Vegetational History of the Eastern Avalon Peninsula, Newfoundland, and Holocene Climatic Change Along the Eastern Canadian Seaboard |
title_full |
Postglacial Vegetational History of the Eastern Avalon Peninsula, Newfoundland, and Holocene Climatic Change Along the Eastern Canadian Seaboard |
title_fullStr |
Postglacial Vegetational History of the Eastern Avalon Peninsula, Newfoundland, and Holocene Climatic Change Along the Eastern Canadian Seaboard |
title_full_unstemmed |
Postglacial Vegetational History of the Eastern Avalon Peninsula, Newfoundland, and Holocene Climatic Change Along the Eastern Canadian Seaboard |
title_sort |
postglacial vegetational history of the eastern avalon peninsula, newfoundland, and holocene climatic change along the eastern canadian seaboard |
publisher |
Les Presses de l'Université de Montréal |
publishDate |
1982 |
url |
http://id.erudit.org/iderudit/032476ar https://doi.org/10.7202/032476ar |
geographic |
Baffin Island |
geographic_facet |
Baffin Island |
genre |
Baffin Island Baffin Newfoundland toundra Tundra |
genre_facet |
Baffin Island Baffin Newfoundland toundra Tundra |
op_relation |
Géographie physique et Quaternaire vol. 36 no. 1-2 (1982) http://id.erudit.org/iderudit/032476ar doi:10.7202/032476ar |
op_rights |
Tous droits réservés © Les Presses de l'Université de Montréal, 1982 |
op_doi |
https://doi.org/10.7202/032476ar |
container_title |
Géographie physique et Quaternaire |
container_volume |
36 |
container_issue |
1-2 |
container_start_page |
175 |
op_container_end_page |
196 |
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1766365813534621696 |