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

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 indic...

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Bibliographic Details
Published in:Geophysical Research Letters
Main Authors: 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
Format: Article in Journal/Newspaper
Language:English
Published: Wiley 2023
Subjects:
Geophysics. Cosmic physics
QC801-809
Greenland
Greenland ice core
ice core
North Atlantic
Online Access:https://doi.org/10.1029/2022GL101182
https://doaj.org/article/70c07b8aebc542a18643187dc027b9f9
Description
Summary: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.

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