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Paleoclimate Signals of Lake Hovsgol, Mongolia, Over the Last 19,000 Years Using Authigenic Beryllium Isotopes

Published online by Cambridge University Press:  26 July 2016

Yire Choi
Affiliation:
Korea Institute of Geoscience and Mineral Resources, Daejeon 305–250, Korea University of Science and Technology, Daejeon 305–350, Korea
Kyeong Ja Kim*
Affiliation:
Korea Institute of Geoscience and Mineral Resources, Daejeon 305–250, Korea
Daekyo Cheong
Affiliation:
Department of Geology, Kangwon National University, Chuncheon, Kangwon-do 200–701, Korea
Yong Ha Kim
Affiliation:
Department of Astronomy and Space Science, Chungnam National University, Daejeon 305–764, Korea
*
3. Corresponding author. Email: kjkim@kigam.re.kr.

Abstract

The paleoclimatic signal of Lake Hovsgol in Mongolia was investigated using authigenic beryllium isotopes from 20 sediment samples. The beryllium isotopic records from this study indicate that there were three dry and cold periods at the lake around 9400, 12,700, and 17,100 cal yr BP. The significant 10Be signal during the Younger Dryas (YD) period is found to be lower. This indicates that the Lake Hovsgol area was subject to a period of cold and dry conditions with minimal dust input, which manifests itself as a low 9Be profile in this study. In warmer and wetter climatic conditions, the 10Be concentration was found to be higher, and this agrees with the sedimentation record of this study. The climatic signals from Lake Hovsgol appear to be similar to a decreased beryllium record during the deglacial period. The results of this study confirm that the Lake Hovsgol area also experienced the global paleoclimatic change associated with the YD event around 12,700 cal yr BP. Further investigation using worldwide lake records by the analytical technique of authigenic beryllium will be useful for understanding the global paleoclimatic change pattern in conjunction with lake-level change.

Type
Articles
Copyright
Copyright © 2014 by the Arizona Board of Regents on behalf of the University of Arizona 

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