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Dendrochronology and Late Holocene History of Bering Piedmont Glacier, Alaska

Published online by Cambridge University Press:  20 January 2017

Gregory C. Wiles ,
Austin Post ,
Ernest H. Muller  and
Bruce F. Molnia
Gregory C. Wiles
Affiliation:
Department of Geology, The College of Wooster, Wooster, Ohio, 44691
Austin Post
Affiliation:
United States Geological Survey (Retired), Vashon, Washington, 98070
Ernest H. Muller
Affiliation:
Heroy Geology Laboratory, Syracuse University, Syracuse, New York, 13244
Bruce F. Molnia
Affiliation:
Office of the Chief Geologist, International Programs, United States Geological Survey, Reston, Virginia, 20192
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Abstract

Fluctuations of the piedmont lobe of Bering Glacier and its sublobe Steller Glacier over the past two millennia are reconstructed using 34 radiocarbon dates and tree-ring data from 16 sites across the glaciers' forelands. The general sequence of glacial activity is consistent with well-dated fluctuations of tidewater and land-terminating glaciers elsewhere along the Gulf of Alaska. Extensive forested areas along 25 km of the Bering ice margin were inundated by glacio-lacustrine and glacio-fluvial sediments during a probable ice advance shortly before 500 cal yr A.D. Regrowth of forests followed the retreating ice as early as the 7th century A.D., with frequent interruptions of tree growth due to outwash aggradation. Forests overrun by ice and buried in outwash indicate readvance about 1080 cal yr A.D. Retreat followed, with ice-free conditions maintained along the distal portions of the forefield until the early 17th century after which the ice advanced to within a few kilometers of its outer Neoglacial moraine. Ice reached this position after the mid-17th century and prior to 200 yr ago. Since the early 20th century, glacial retreat has been punctuated by periodic surges. The record from forests overrun by the nonsurging Steller Lobe shows that this western ice margin was advancing by 1250 A.D., reaching near its outer moraine after 1420 cal yr A.D. Since the late 19th century, the lobe has dominantly retreated.

Keywords

surging glacierAlaskadendrochronologyHoloceneBering GlacierNeoglaciation
Type
Research Article
Information
Quaternary Research , Volume 52 , Issue 2 , September 1999 , pp. 185 - 195
Copyright
University of Washington

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