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DOI: 10.1177/0959683607082439 © 2007 SAGE Publications The influence and chronological uncertainties of the 8.2 ka cooling event on continental climate records in ChinaState Key Laboratory of Loess and Quaternary Geology, Institute of Earth Environment, Chinese Academy of Sciences, Xi'an 710075, China, zhdjin523{at}hotmail.com, Key Laboratory of Lake Sedimentation and Environment, Nanjing Institute of Geography & Limnology, Chinese Academy of Sciences, Nanjing 210008, China
Department of Earth Sciences, University of Cambridge, Downing Street, Cambridge CB2 3EQ, UK
College of Chemistry and Molecular Engineering, Peking University, Beijing 100871, China, Institute of Geophysical and Geochemical Exploration, Chinese Academy of Geological Sciences, Langfang 065000, China
Key Laboratory of Lake Sedimentation and Environment, Nanjing Institute of Geography & Limnology, Chinese Academy of Sciences, Nanjing 210008, China
Key Laboratory of Lake Sedimentation and Environment, Nanjing Institute of Geography & Limnology, Chinese Academy of Sciences, Nanjing 210008, China
School of Environment and Planning, Liaocheng University, Shandong 252059, China
A compilation of early-Holocene terrestrial records from lacustrine sediments, ice cores, peat bog, palaeosols, stalagmites and flood sediments from China indicates that the early-Holocene climate was unstable and characterized by at least one centennial-scale (500—200 years) cooling event between 9.0 and 7.6 ka BP. The cold period recorded in different settings has been previously linked to the 8.2 ka event suggested by
Key Words: Holocene • 8.2 ka climate event • dating • terrestrial proxy records • lacustrine sediments • ice cores • palaeosols • peat bog • stalagmites • China.
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18O ice from Greenland ice cores, but the differences in time duration and regional climate conditions have been attributed to monsoon systems, inadequate age control and sampling resolution, and complex topography in China. However, our compilation indicates that it is premature to attribute the cold periods recorded at different locations in China simply to the 8.2 ka event, let alone to attribute the cause of those anomalies to a freshening of the North Atlantic Ocean circulation. Whether there was one synchronous event or not in China, where the climate is mainly affected by the monsoons and the westerlies, is open to discussion, because most of the records lack sufficient dating control to define clearly the nature of the cooling event. If a cooling event did occur, more evidence is required in multiple dimensions to characterize the time duration, magnitude and cause of the event, so much work remains to be done.