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Expansion of alpine glaciers in Pacific North America in the first millennium A.D.

Alberto V. Reyes, Gregory C. Wiles, Dan J. Smith, David J. Barclay, Sandra Allen, Scott Jackson, Sonya Larocque, Sarah Laxton, Dave Lewis, Parker E. Calkin and John J. Clague
Expansion of alpine glaciers in Pacific North America in the first millennium A.D.
Geology (Boulder) (January 2006) 34 (1): 57-60


Radiocarbon ages and lichen-dated moraines from 17 glaciers in coastal and near- coastal British Columbia and Alaska document a widespread glacier advance during the first millennium A.D. Glaciers at several sites began advancing ca. A.D. 200-300 based on radiocarbon-dated overridden forests. The advance is centered on A.D. 400-700, when glaciers along an approximately 2000 km transect of the Pacific North American cordillera overrode forests, impounded lakes, and deposited moraines. The synchroneity of this glacier advance and inferred cooling over a large area suggest a regional climate forcing and, together with other proxy evidence for late Holocene environmental change during the Medieval Warm Period and Little Ice Age, provide support for millennial-scale climate variability in the North Pacific region.

ISSN: 0091-7613
EISSN: 1943-2682
Serial Title: Geology (Boulder)
Serial Volume: 34
Serial Issue: 1
Title: Expansion of alpine glaciers in Pacific North America in the first millennium A.D.
Affiliation: University of Alberta, Department of Earth and Atmospheric Sciences, Edmonton, AB, Canada
Pages: 57-60
Published: 200601
Text Language: English
Publisher: Geological Society of America (GSA), Boulder, CO, United States
References: 37
Accession Number: 2006-013223
Categories: Quaternary geology
Document Type: Serial
Bibliographic Level: Analytic
Annotation: With GSA Data Repository Item 2006009
Illustration Description: illus. incl. sketch map
N48°25'00" - N60°00'00", W139°00'00" - W114°00'00"
N59°15'00" - N61°01'00", W152°00'00" - W148°00'00"
N61°00'00" - N62°30'00", W145°00'00" - W140°00'00"
Secondary Affiliation: College of Wooster, USA, United StatesUniversity of Victoria Tree-Ring Laboratory, CAN, CanadaState University of New York at Cortland, USA, United StatesUniversity of Colorado, USA, United StatesSimon Fraser University, CAN, Canada
Country of Publication: United States
Secondary Affiliation: GeoRef, Copyright 2017, American Geosciences Institute. Reference includes data supplied by the Geological Society of America, Boulder, CO, United States
Update Code: 200607
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