Deglaciation of the Cordillera of Western Canada at the end of the Pleistocene

Clague, John J.

doi:10.18172/cig.3232

Cited by 12 publications

(10 citation statements)

References 56 publications

(77 reference statements)

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“…Additional detailed, site-specific work should take place to further constrain Younger Dryas and Holocene glacier fluctuations in Southeast Alaska. By 11 ka, ice in western Canada had retreated significantly from its late Pleistocene maximum (Clague, 2017), consistent with our results from the Southeast Alaskan coast.…”

Section: Discussionsupporting

confidence: 89%

New constraints on the last deglaciation of the Cordilleran Ice Sheet in coastal Southeast Alaska

Lesnek

Briner

Baichtal³

et al. 2020

Quat. res.

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Understanding marine-terminating ice sheet response to past climate transitions provides valuable long-term context for observations of modern ice sheet change. Here, we reconstruct the last deglaciation of marine-terminating Cordilleran Ice Sheet (CIS) margins in Southeast Alaska and explore potential forcings of western CIS retreat. We combine 27 new cosmogenic 10Be exposure ages, 13 recently published 10Be ages, and 25 new 14C ages from raised marine sediments to constrain CIS recession. Retreat from the outer coast was underway by 17 ka, and the inner fjords and sounds were ice-free by 15 ka. After 15 ka, the western margin of the CIS became primarily land-terminating and alpine glaciers disappeared from the outer coast. Isolated alpine glaciers may have persisted in high inland peaks until the early Holocene. Our results suggest that the most rapid phase of CIS retreat along the Pacific coast occurred between ~17 and 15 ka. This retreat was likely driven by processes operating at the ice-ocean interface, including sea level rise and ocean warming. CIS recession after ~15 ka occurred during a time of climatic amelioration in this region, when both ocean and air temperatures increased. These data highlight the sensitivity of marine-terminating CIS regions to deglacial climate change.

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Section: Discussionsupporting

confidence: 89%

New constraints on the last deglaciation of the Cordilleran Ice Sheet in coastal Southeast Alaska

Lesnek

Briner

Baichtal³

et al. 2020

Quat. res.

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“…Glaciers in western Canada were expanding into lowland areas on the flanks of the Coast and Rocky Mountains during the GLGM, contributing to development of the CIS (Clague, 2017). The CIS was not fully formed at the GLGM; large areas of southern British Columbia remained ice-free several thousand years later.…”

Section: Cordilleran Ice Sheet and North Cascadesmentioning

confidence: 99%

“…The B-A interstadial began with the rapid disintegration of the CIS and deglaciation in the North Cascades from 14.5 ka to 13.5 ka (Clague, 2017;Menounos et al, 2017;Riedel, 2017). Recent glacio-isostatic adjustment models supported by data calibration from records of sea level, paleo-lake shorelines, and present-day geodetic measurements confirm more than 500 m of thinning of the CIS between 14.5 ka and 14.0 ka (Peltier et J o u r n a l P r e -p r o o f al., 2015; Lambeck et al, 2017).…”

Section: Cordilleran Ice Sheet and North Cascadesmentioning

confidence: 99%

“…Top-down deglaciation of the ice sheet from mountain divides led to exposure of valley heads and cirques before adjacent valley floors. This set the stage for the formation of new cirque and valley moraines from Yukon Territory to the North Cascades during the B-A (Clague, 2017;Riedel, 2017). Menounos et al (2017) report 76 10 Be surface exposure ages on bedrock and boulders associated with lateral and end moraines at 26 locations in high mountains of British Columbia and Yukon Territory.…”

Section: Cordilleran Ice Sheet and North Cascadesmentioning

confidence: 99%

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The deglaciation of the Americas during the Last Glacial Termination

Palacios

Stokes

Phillips

et al. 2020

Earth-Science Reviews

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“…The last glacier dome, Labrador, disappeared in 6.7 ± 0.4 ka (Stokes, 2017). The CIS had disappeared by 11 ka (Clague, 2017). Alaskan glaciers did not recover from the late YD to the Holocene Neoglacial period, as happened in Western Canada, the North Cascades, the Rocky Mountains and the Sierra Nevada.…”

Section: Holocene Advances and The Culmination Of Deglaciationmentioning

confidence: 96%

The state of knowledge on the deglaciation of America in 2017

Palacios

2017

CIG

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This work presents a summary of all contributions included in this Special Issue on the deglaciation of America. It analyses the differences and coincidences between the phases of glacial evolution and their chronology in each of the regions studied, and seeks a possible explanation for asynchronies, according to the opinions of the authors of the contributions. Most of the papers show significant diversity within each region due to local factors and different approaches to their study. Often, local differences are even more important than differences with other regions. In North and Central America glacial evolution appears quite uniform, in line with the evolution of the temperature in the North Atlantic. The differences found between some regions may be due to slight variations in the impact of the temperature of the Atlantic in each region, and to differences in approaching their study. The glacial evolution of the Andes presents a greater diversity, probably due to the existence of arid areas along most of the mountain range, which show a greater sensitivity to the reception of humidity than to temperature in their glacial balance. In general, researchers have detected an attenuation of the influence of the temperature of the North Atlantic towards the south, and of the Antarctic Cold Reversal towards the north.

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Deglaciation of the Cordillera of Western Canada at the end of the Pleistocene

Abstract: ABSTRACT. Nearly all of what is now British Columbia and adjacent areas were covered by an ice sheet at the maximum of the Last Glaciation (MIS 2) about

Cited by 12 publications

References 56 publications

New constraints on the last deglaciation of the Cordilleran Ice Sheet in coastal Southeast Alaska

New constraints on the last deglaciation of the Cordilleran Ice Sheet in coastal Southeast Alaska

The deglaciation of the Americas during the Last Glacial Termination

The state of knowledge on the deglaciation of America in 2017

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