Journal
QUATERNARY SCIENCE REVIEWS
Volume 194, Issue -, Pages 116-127Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.quascirev.2018.07.016
Keywords
Sherman Glacier; Sheridan Glacier; Alaska; Climate change; Radiocarbon dating; Glacier-dammed lake; Holocene; Glaciation; Glacial geomorphology; Sedimentology
Funding
- NSERC [24595]
- Canada Research Chairs program
- NSERC-PGS-D3 scholarship
- SFU Graduate International Scholarship
- Northern Scientific Training Program grant
- Arctic Institute of North America
- Geological Society of America 'Bruce L. Reed' Research Award
- GNS Science, New Zealand
- Polar Geospatial Center under NSF OPP award [1043681, 1559691, 1542736]
- Office of Polar Programs (OPP)
- Directorate For Geosciences [1542736, 1559691, 1043681] Funding Source: National Science Foundation
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Two adjacent glaciers in the Chugach Mountains of south-central Alaska have markedly different histories on decadal to perhaps centennial timescales. Sheridan Glacier has advanced and retreated hundreds of metres during the latest Holocene. Its recent fluctuations have markedly altered local base level of Sherman River, which drains Sherman Glacier and flows into Sheridan Lake. Sheridan Glacier advanced to its greatest extent during the Little Ice Age, raising base level of Sherman River and inducing aggradation there of up to 17 m of sediment. Retreat of Sheridan Glacier formed a series of lakes that have coalesced. As lower lake outlets have become available, base level of Sherman River has dropped, resulting in the evacuation of substantial volumes of sediment from Sherman River valley. In about 2000, the terminus of Sheridan Glacier began to disintegrate; retreat accelerated dramatically in 2010. By 2016, the glacier had retreated an average of 600 m from its 2010 terminus, although some areas retreated up to 1.9 km and others did not retreat at all. Meanwhile, Sherman Glacier continued a slow advance initiated by a rock avalanche that blanketed much of its ablation area in the 1964 Alaska earthquake. (C) 2018 Elsevier Ltd. All rights reserved.
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