Timing, Duration, and Transitions of the Last Interglacial Asian Monsoon

Author:

Yuan Daoxian12345,Cheng Hai12345,Edwards R. Lawrence12345,Dykoski Carolyn A.12345,Kelly Megan J.12345,Zhang Meiliang12345,Qing Jiaming12345,Lin Yushi12345,Wang Yongjin12345,Wu Jiangyin12345,Dorale Jeffery A.12345,An Zhisheng12345,Cai Yanjun12345

Affiliation:

1. Karst Dynamics Laboratory, Ministry of Land and Resources, 40 Qixing Road, Guilin 541004, China.

2. Department of Geology and Geophysics, University of Minnesota, Twin Cities, MN 55455, USA.

3. College of Geography Science, Nanjing Normal University, Nanjing 210097, China.

4. Department of Geoscience, University of Iowa, Iowa City, IA 52242, USA.

5. State Key Lab of Loess and Quaternary Geology, Institute of Earth Environment, Chinese Academy of Sciences, Xi'an 710075, China.

Abstract

Thorium-230 ages and oxygen isotope ratios of stalagmites from Dongge Cave, China, characterize the Asian Monsoon and low-latitude precipitation over the past 160,000 years. Numerous abrupt changes in 18 O/ 16 O values result from changes in tropical and subtropical precipitation driven by insolation and millennial-scale circulation shifts. The Last Interglacial Monsoon lasted 9.7 ± 1.1 thousand years, beginning with an abrupt (less than 200 years) drop in 18 O/ 16 O values 129.3 ± 0.9 thousand years ago and ending with an abrupt (less than 300 years) rise in 18 O/ 16 O values 119.6 ± 0.6 thousand years ago. The start coincides with insolation rise and measures of full interglacial conditions, indicating that insolation triggered the final rise to full interglacial conditions.

Publisher

American Association for the Advancement of Science (AAAS)

Subject

Multidisciplinary

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5. Oxygen isotope analyses were performed at the Isotope Laboratory Institute of Karst Geology Guilin China using a VG MM-903 gas mass spectrometer (for Dongge Cave D3 and D4 analyses except for D4 between 15.81 ky and 9.98 ky); at the State Key Laboratory of Loess and Quaternary Geology Institute of Earth Environment Xi'an China using a Finnigan MAT 252 Kiel Device III (Dongge Cave D4 between 15.81 and 9.98 ky); and on a Finnigan MAT 251 at the Nanjing Institute of Geology and Paleontology Chinese Academy of Sciences (Hulu Cave H82 between 15.34 and 16.30 ky before the present). Other H82 analyses were reported earlier in ( 3 ).

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