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Tree-ring-based reconstructions of North American glacier mass balance through the Little Ice Age — Contemporary warming transition

Published online by Cambridge University Press:  20 January 2017

Nathan L. Malcomb*
Affiliation:
Portland Forestry Sciences Laboratory, Pacific Northwest Research Station, USDA Forest Service, 620 SW Main Street, Suite 400, Portland, OR 97205, USA
Gregory C. Wiles
Affiliation:
Department of Geology, The College of Wooster, 944 College Mall, Wooster, OH 44691, USA
*
*Corresponding author. E-mail addresses:nlmalcomb@fs.fed.us (N.L. Malcomb), gwiles@wooster.edu (G.C. Wiles).

Abstract

Glacier mass-balance reconstructions provide a means of placing relatively short observational records into a longer-term context. In western North America, mass-balance records span four to five decades and capture a relatively narrow window of glacial behavior over an interval that was dominated by warming and ablation. We use temperature- and moisture-sensitive tree-ring series to reconstruct annual mass balance for six glaciers in the Pacific Northwest and Alaska. Mass-balance models rely on the climatic sensitivity of tree-ring chronologies and teleconnection patterns in the North Pacific. The reconstructions extend through the mid to latter portions of the Little Ice Age (LIA) and explore the role of climate variability in forcing mass balance across multiple environmental gradients. Synchronous positive mass-balance intervals coincide with regional moraine building and solar minima, whereas differences in LIA glacier behavior are related to synoptic climate forcing. Secular warming in the late 19th century to present corresponds with the only multi-decadal intervals of negative mass balance in all glacier reconstructions. This suggests that contemporary retreat in western North America is unique with respect to the last several centuries and that regional patterns of glacier variability are now dominated by global climate forcing.

Information

Type
Research Article
Copyright
University of Washington

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Supplementary material: PDF

Malcomb and Wiles Supplementary Material

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