Cold event at 5500 a BP recorded in mud sediments on the inner shelf of the East China Sea  

作　　者：徐方建 李安春 胥可辉 李铁刚 陈世悦 万世明 刘建国 

机构地区：[1]Key Laboratory of Marine Geology and Environment,Institute of Oceanology,Chinese Academy of Sciences [2]Faculty of Geo-Resources and Information,China University of Petroleum,Qingdao [3]Graduate University of Chinese Academy of Sciences [4]Department of Marine Science,Coastal Carolina University,P.O.Box 261954,Conway,SC 29528,USA

出　　处：《Chinese Journal of Oceanology and Limnology》2009年第4期975-984,共10页中国海洋湖沼学报（英文版）

基　　金：Supported by the National Natural Science Foundation of China (Nos. 40576032 and 40776030);Doctor Foundation of China University of Petroleum

摘　　要：A 700-year record （1.0-1.5 a resolution） of the East Asian winter monsoon （EAWM）, based on grain-size analysis and AMSI4C dating of Core EC2005 from the inner-shelf mud wedge of the East China Sea （ECS）, was compared with the Dongge stalagmite 8180 record during the mid-Holocene. The upper muddy section of Core EC2005 has been formed mainly by suspended sediments derived from the Changjiang （Yangtze） River mouth since 7.3 ka BP. High precipitation and a strengthened EAWM might have played key roles in the high sedimentation rate （1 324-1 986 crn/ka） between 5.9-5.2 ka BP. The EAWM strengthened when the Asian summer monsoon weakened, especially around 5 500 a BE which corresponded to a worldwide cold event. The EAWM during the mid-Holocene shows statistically significant solar periodicities at 62 and 11 a. The 5 500 a BP cold event might be resulted from orbital forcing and changes in solar activity.A 700-year record (1.0-1.5 a resolution) of the East Asian winter monsoon (EAWM),based on grain-size analysis and AMS14C dating of Core EC2005 from the inner-shelf mud wedge of the East China Sea (ECS),was compared with the Dongge stalagmite δ18O record during the mid-Holocene.The upper muddy section of Core EC2005 has been formed mainly by suspended sediments derived from the Changjiang (Yangtze) River mouth since 7.3 ka BP.High precipitation and a strengthened EAWM might have played key roles in the high sedimentation rate (1 324-1 986 cm/ka) between 5.9-5.2 ka BP.The EAWM strengthened when the Asian summer monsoon weakened,especially around 5500 a BP,which corresponded to a worldwide cold event.The EAWM during the mid-Holocene shows statistically significant solar periodicities at 62 and 11 a.The 5500 a BP cold event might be resulted from orbital forcing and changes in solar activity.

关 键 词：5 500 a BP cold event GRAIN-SIZE East Asian winter monsoon MID-HOLOCENE East China Sea 

分 类 号：P736.2[天文地球—海洋地质]