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Abrupt climatic events during the last glacial-interglacial transition in Alaska

Hu, Feng Sheng and Nelson, David M. and Clarke, Gina H. and Ruhland, Kathleen M. and Huang, Yongsong and Kaufman, Darrell S. and Smol, John P. (2006) Abrupt climatic events during the last glacial-interglacial transition in Alaska. Geophysical Research Letters, 33. L18708. ISSN 1944-8007


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Publisher’s or external URL: http://dx.doi.org/10.1029/2006GL027261


Evidence is mounting that abrupt climatic shifts occurred during the last glacial-interglacial transition (LGIT) in the North Atlantic and other regions. However, few high-resolution climatic records of the LGIT exist from the high latitudes of the North Pacific rim. We analyzed lake sediments from southwestern Alaska for biogenic silica, organic carbon, organic nitrogen, diatom assemblages, and compound-specific hydrogen isotopes. Results reveal climatic changes coincident with the Younger Dryas, Intra-Allerod Cold Period, and Pre-Boreal Oscillation. However, major discrepancies exist in the paleoclimate patterns of the Bolling-Allerod interstadial between our data and the GISP2 18O record from Greenland, and causes are uncertain. These data suggest that the North Pacific and North Atlantic experienced similar reversals during climatic warming of the LGIT but that the Bolling-Allerod cooling trend in the GISP2 18O record is probably not a hemispheric or global pattern.

Item Type: Article
Publisher’s Statement: ©2006. American Geophysical Union. All Rights Reserved.
ID number or DOI: 10.1029/2006GL027261
Keywords: ahklun mountains; Analytical geochemistry; Atmospheric movements; climate change; environmental-change; glacial geology; Greenland; hydrogen isotope ratios; lake; record; sediments; southwestern Alaska; termination; younger-dryas
Subjects: Q Science > QC Physics
Q Science > QE Geology
NAU Depositing Author Academic Status: Faculty/Staff
Department/Unit: College of Engineering, Forestry, and Natural Science > School of Earth Sciences and Environmental Sustainability
Date Deposited: 12 Oct 2015 18:09
URI: http://openknowledge.nau.edu/id/eprint/728

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