On the timing of the East Asian summer monsoon maximum during the Holocene Does the speleothem oxygen isotope record reflect monsoon rainfall variability?

查看全文 作　　者：CHEN [1]JianHui;RAO [1]ZhiGuo;LIU [1]JianBao;HUANG [1]Wei;FENG [2]Song;DONG [1]GuangHui;HU [1]Yu;XU [3]QingHai;CHEN [1]FaHu

机构地区：[1]Key Laboratory of West China's Environmental System(Ministry of Education),College of Earth and Environmental Sciences,Lanzhou University,Lanzhou 730000,China;[2]Department of Geosciences,University of Arkansas,Fayetteville,AR 72701,USA;[3]Institute of Nihewan Archaeology Research,Hebei Normal University,Shijiazhuang 050024,China

出　　处：《Science China(Information Sciences)》索引2016年第59卷第12期,共11页

基　　金：supported by the National Natural Science Foundation of China(Grant Nos.41130102&41471162);the Fundamental Research Funds for the Central Universities(Grant Nos.LZUJBKY-2015-K09&LZUJBKY-2015-124);JC is partially supported by the Chinese Scholarship Council 摘　　要：The evolution of the East Asian summer monsoon(EASM) during the Holocene has long been of significant interest.Knowledge of past EASM variability not only increases our understanding of monsoon dynamics on a long timescale,but it also provides an environmental and climatic background for research into Chinese cultural development.However,the timing of the EASM maximum remains controversial.The popular concept of an 'early Holocene maximum' is mainly based on speleothemδ^(18)O(δ^(18)O_c) records from caves in southern China;however,the interpretation of δ^(18)O_C as a reliable proxy for EASM intensity is being increasingly challenged.The present paper is a critical review of the climatic significance of the δ^(18)O_C record from China.Firstly,we suggest that precipitation in northern China is an appropriate index of EASM intensity,the variation of which clearly indicates a mid-Holocene monsoon maximum.Secondly,an interregional comparison demonstrates that the precipitation record in northern China is quite different from that in southern China on a range of timescales,and is inconsistent with the spatial similarity exhibited by speleothem oxygen isotope records.Furthermore,both modeling and observational data show that the δ^(18)O_C records from southern China indeed reflect changes in precipitation δ^(18)O(δ^(18)O_P) rather than precipitation amount,and therefore that their use as an EASM proxy is inappropriate.Finally,we address several significant monsoon-related issues-including the driving mechanism of the EASM on an orbital timescale,the climatic significance of speleothem oxygen isotopes,and the relationship between atmospheric circulation and precipitation in monsoonal regions. 关键词：East Asian summer monsoon HOLOCENE Speleothem oxygen isotopes

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On the timing of the East Asian summer monsoon maximum during the Holocene Does the speleothem oxygen isotope record reflect monsoon rainfall variability?

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