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Interdecadal to centennial climate variability surrounding the 8.2 ka event in Beijing revealed through speleothem record
  • +8
  • Pengzhen Duan,
  • hanying li,
  • Zhibang Ma,
  • Jingyao Zhao,
  • Ashish Sinha,
  • Peng Hu,
  • Haiwei Zhang,
  • Yanjun Cai,
  • Youfeng Ning,
  • R. Lawrence Edwards,
  • Hai Cheng
Pengzhen Duan
Xi'an Jiaotong University
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hanying li
Xi'an Jiaotong University
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Zhibang Ma
Key Laboratory of Cenozoic Geology and Environment & Institute of Geology and Geophysics, Chinese Academy of Sciences
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Jingyao Zhao
Xi'an Jiaotong University
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Ashish Sinha
CSUDH
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Peng Hu
Chinese Academy of Sciences (CAS)
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Haiwei Zhang
Xian Jiaotong University
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Yanjun Cai
Institute of Global Environmental Change, Xi'an Jiaotong University
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Youfeng Ning
Institute of Global Environmental Change, Xi'an Jiaotong University, Xi'an, 710054, China
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R. Lawrence Edwards
U. Minnesota
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Hai Cheng
Xi'an Jiaotong University

Corresponding Author:[email protected]

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Abstract

The 8.2 ka event has been extensively studied, whereas its structure is ambiguous in North China. Here we present a high-resolution (~1 year) δ18O record of annual laminated speleothem from Beijing to characterize the detailed variability across this event in North China. Our record indicates a dry 8.2 ka event spanning 8.254‒8.107 ka BP with a two-stage structure superimposed by three prominent positive excursions. The identical structure of speleothem δ18O records between North and central China during the event suggests a common forcing/response in East China, whereas the progressively increased offset between their average values may reflect changes in moisture source or rainout effect. A close comparison with the Greenland ice core records suggest a strong linear response of the Asian summer monsoon to the North Atlantic climate changes across the early and middle stages of the event, but a different mechanism in the termination process.