Interdecadal to Centennial Climate Variability Surrounding the 8.2 ka Event in North China Revealed Through an Annually Resolved Speleothem Record From Beijing

Pengzhen Duan, Hanying Li, Zhibang Ma, Jingyao Zhao, Xiyu Dong, Ashish Sinha, Peng Hu, Haiwei Zhang, Yanjun Cai, Youfeng Ning, R. Lawrence Edwards, Hai Cheng

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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 from 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 high δ18O 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 suggests 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 processes.

Original languageEnglish (US)
Article numbere2022GL101182
JournalGeophysical Research Letters
Volume50
Issue number1
DOIs
StatePublished - Jan 16 2023
Externally publishedYes

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© 2022. The Authors.

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