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Slow change since the Little Ice Age at a far northern glacier with the potential for system reorganization: Thores Glacier, northern Ellesmere Island, Canada

Kochtitzky Will, Copland Luke, Wohlleben Trudy, Iqaluk Pilipoosie, Girard Catherine, Vincent Warwick F. et Culley Alexander I.. (2023). Slow change since the Little Ice Age at a far northern glacier with the potential for system reorganization: Thores Glacier, northern Ellesmere Island, Canada. Arctic Science, 9, (2), p. 451-464.

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URL officielle: https://dx.doi.org/doi:10.1139/as-2022-0012

Résumé

Relatively little is known about the glaciers of northern Ellesmere Island, Canada. Here we describe the first field and remote sensing observations of Thores Glacier, located 50 km inland from the Arctic Ocean. The glacier is slow-moving, with maximum velocities of 26 m a −1 and a maximum observed thickness of 360 ± 4.3 m. There has been little change in terminus position since at least 1959, with a maximum advance of 170 m at the northwest terminus ending on land and retreat up to 130 m at the southeast terminus ending in Thores Lake. There is little evidence for change since the Little Ice Age as bedrock weathering patterns suggest retreat of no more than 20–30 m around most of the glacier margin. The supraglacial drainage network is generally poorly developed, without moulins and with few crevasses, and therefore no evidence of water reaching the glacier bed. This is supported by one-dimensional modelling, which suggests current basal temperatures of −7.0 °C to −12.0 °C along the centerline. Thores Glacier currently dams Thores Lake, which causes drainage to flow to the southeast. However, if the glacier thins or retreats sufficiently, regional drainage will reverse and flow to the north, and Thores Lake would no longer exist.

Type de document:Article publié dans une revue avec comité d'évaluation
ISSN:2368-7460
Volume:9
Numéro:2
Pages:p. 451-464
Version évaluée par les pairs:Oui
Date:1 Juin 2023
Nombre de pages:14
Identifiant unique:10.1139/as-2022-0012
Sujets:Sciences naturelles et génie > Sciences appliquées > Climatologie et météorologie
Sciences naturelles et génie > Sciences naturelles > Biologie et autres sciences connexes
Département, module, service et unité de recherche:Départements et modules > Département des sciences fondamentales
Unités de recherche > Centre de recherche sur la Boréalie (CREB)
Mots-clés:Arctic, climate change, glaciers, proglacial lake, Little Ice Age, Last ice area
Déposé le:04 oct. 2023 18:44
Dernière modification:04 oct. 2023 18:44
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