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A biogenic-silica δ18O record of climatic change during the last glacial–interglacial transition in southwestern Alaska

Published online by Cambridge University Press:  20 January 2017

Feng Sheng Hu*
Affiliation:
Departments of Plant Biology and Geology, University of Illinois, Urbana, IL 61801, USA
Aldo Shemesh
Affiliation:
Department of Environmental Sciences, The Weizmann Institute of Science, Rehovot 76100, Israel
*
*Corresponding author. Email Address:fshu@life.uiuc.edu

Abstract

Despite growing evidence for environmental oscillations during the last glacial–interglacial transition from high latitude, terrestrial sites of the North Pacific rim, oxygen-isotopic records of these oscillations remain sparse. The lack of data is due partially to the paucity of lakes that contain carbonate sediment suitable for oxygen-isotopic analysis. We report here the first record of oxygen-isotopic composition in diatom silica (δ18OSi) from a lake in that region. δ18OSi increases gradually from 19.0 to 23.5‰ between 12,340 and 11,000 14C yr B.P., reflecting marked climatic warming at the end of the last glaciation. Around 11,000 14C yr B.P., δ18OSi decreases by 1.7‰, suggesting a temperature decrease of 3.5–8.9 °C at the onset of the Younger Dryas (YD) in southwestern Alaska. Climatic recovery began ca. 10,740 14C yr B.P., as inferred from the increase of δ18OSi to a maximum of 23.9‰ near the end of the YD. Our data reveal that a YD climatic reversal in southwestern coastal areas of Alaska occurred, but the YD climate did not return to full-glacial conditions.

Type
Articles
Copyright
Elsevier Science (USA)

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