Evidence for a Neoglacial advance of the Boundary Glacier, Banff National Park, Alberta

Gardner, James S.; Jones, Norman K.

doi:10.1139/e85-185

Cited by 40 publications

(23 citation statements)

References 2 publications

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“…The present glacier is a product of the Neoglacial which commenced shortly before 4000 years B.P. at this location (Gardner and Jones, 1985). Boundary Glacier probably persisted in its early Neoglacial extent throughout much of the subsequent 4000 years and achieved a maximum sometime in the last 250 years during the Cavell Advance (Little Ice Age).…”

Section: Boundary Glaciermentioning

confidence: 79%

Evidence for Headwall Weathering Zones, Boundary Glacier, Canadian Rocky Mountains

Gardner

1987

J. Glaciol.

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ABSTRACT. Temperature records from several randklu/t sites at the margins and headwall of Boundary Glacier (Iat. 52°12'N., long. 117°12'W.) in the Canadian Rocky Mountains are presented. These records indicate that during the ablation season a diurnal freeze-thaw air and rocksurface temperature regime occurs in a 2 m wide zone centred on the randklu/t lip. Deeper in the randklu/t , stable sub-zero conditions prevail whereas above the randklu/t an above-freezing temperature regime prevails. The freeze-thaw temperature regime, observed freezing of melt water and rain water on randklu/t rock surfaces, and copious in-situ loose weathering products on the head wall and marginal free faces suggest an active frost-shattering environment. Downslope migration of the randklu/t lip during the ablation season results in a migration of the freeze-thaw zone and thus a seasonal extension of the rock surface area exposed to the favorable weathering environment. Longer-term glacier fluctuations, with attendant thinning and thickening of the ice body, could result in large areas of marginal and headwall rock surfaces being exposed to the randklu/t weathering environment over long periods of time. The data and observations from Boundary Glacier support an idea, suggested by Battle (1960), that open and shallow randklu/ts, rather than closed and deep bergschrunds, are a focus of weathering at glacier margins and thus a potential factor in cirque development.

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Section: Boundary Glaciermentioning

confidence: 79%

Evidence for Headwall Weathering Zones, Boundary Glacier, Canadian Rocky Mountains

Gardner

1987

J. Glaciol.

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“…Moreover, recent radiocarbon dates from the Boundary Glacier, an outlet from the Columbia Icefield about 5 km southeast of Wilcox Pass, suggest that a Neoglacial ice advance occurred ca. 4000 yr BP (GARDNER and JONES, 1985). The lower ratios ca.…”

Section: Diagramme Schématisé Montrant Les Relations Qu'entretiennentmentioning

confidence: 92%

Using Picea/Pinus Ratios from the Wilcox Pass Core, Jasper National Park, Alberta, to Investigate Holocene Timberline Fluctuations

Beaudoin¹

2007

gpq

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Holocene timberline fluctuations are investigated using Picea/Pinus ratios from the tephra and radiocarbon-dated Wilcox Pass Core (52°14'N, 117°13'W). Timberline elevations are calibrated by comparing Picea/Pinus ratios from the core with modern ratios obtained in surface samples of a transect from alpine vegetation in Wilcox Pass into subalpine forest in adjacent Sunwapta Pass. Ratios higher than present ratios from the site imply higher-than-present timberline elevation. The Picea/Pinus ratios imply higher-than-present timberline between ca. 6540-1480 yr BP, with a minimum about 4210 yr BP, while timberline was lower than present between ca. 1480 - 540 yr BP and increased in elevation after 540 yr BP. This record substantially agrees with other palaeoenvironmental records from the region. The main limitation on the technique is that it can only be applied since similar-to-present vegetation became established in the area. Hence, Piceal Pinus ratios from the Wilcox Pass core prior to ca. 6540 yr BP cannot readily be interpreted by this method.On a pu évaluer les différentes altitudes de la limite des arbres en comparant les taux de Picea et de Pinus présents dans la carotte, qui a été datée au radiocarbone et par tephrochronologie, avec les taux actuels enregistrés dans des échantillons de surface le long d'un tracé qui s'étend de Wilcox Pass, en végétation alpine, jusqu'à Sunwapta Pass tout près, en forêt subalpine. Les plus forts taux de pollen observés dans la carotte que dans les échantillons de surface démontrent que la limite des arbres était à une altitude supérieure entre environ 6540 et 1480 BP que maintenant, avec un minimum vers 4210 BP. Par contre, la limite des arbres était inférieure à maintenant entre environ 1480 et 540 BP, pour s'élever de nouveau après 540 BP. Ces observations concordent en grande partie avec d'autres études paléoenvironnementales effectuées dans la région. La technique ne peut toutefois s'appliquer qu'à partir du moment où le même type de végétation que celui que l'on trouve aujourd'hui s'est déjà manifesté. Pour cette raison, les taux de Picea et de Pinus enregistrés dans la carotte de Wilcox Pass avant 6540 BP environ ne peuvent être interprétés à l'aide de cette méthode.Die Fluktuationen der Baumgrenze im Holozàn werden unter Nutzung der Picea/Pinus-Anteile des mittels Tephra und Radiokarbon datierten Wilcox Pass-Probe (117°13'W, 52°14'N) untersucht. Die verschiedenen Hôhen der Baumgrenze wurden kalibriert, indem man Picea/Pinus-Anteile der Probe verglich mitgegenwârtigen Anteilen, welche aus Oberflàchenproben entlang einem Làngsschnitt gewonnen wurden, der von der alpinen Vegetation im Wilcox Pass bis zum subalpinen WaId im angrenzenden Sunwapta Pass reicht. Hôhere Anteile als die gegenwàrtigen von dieser Stelle bedeuten, daB die Baumgrenze hôher war als gegenwàrtig. Die Picea/Pinus-Anteile lassen fur die Zeit zwischen etwa 6540 — 1480 Jahren v.u.Z. auf eine hôhere Baumgrenze als gegenwàrtig schliepen mit einem Minimum vor etwa 4210 Jahren v.u.Z., als die Baumgrenze niedri...

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“…Glaciers (Gardner and Jones, 1985). Within the Columbia River Basin, Illecillewaet Glacier, for example, advanced more than 90 m from 1972 to 1984 (Champoux and Ommanney, 1986 (Harper, 1993) and in Glacier National Park, Montana, from 1966 to 1979 (Carrara, 1987).…”

Section: Glacier Terminus Changementioning

confidence: 99%

Glacier change and contribution to streamflow in the Canoe Basin, British Columbia, 1948-2005.

Brewis¹

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Evidence for a Neoglacial advance of the Boundary Glacier, Banff National Park, Alberta

Cited by 40 publications

References 2 publications

Evidence for Headwall Weathering Zones, Boundary Glacier, Canadian Rocky Mountains

Evidence for Headwall Weathering Zones, Boundary Glacier, Canadian Rocky Mountains

Using Picea/Pinus Ratios from the Wilcox Pass Core, Jasper National Park, Alberta, to Investigate Holocene Timberline Fluctuations

Glacier change and contribution to streamflow in the Canoe Basin, British Columbia, 1948-2005.

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