Cold event at 5 500 a BP recorded in mud sediments on the inner shelf of the East China Sea |
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| Authors: | XU Fangjian LI Anchun XU Kehui LI Tiegang CHEN Shiyue WAN Shiming LIU Jianguo |
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| Institution: | [1]Key Laboratory of Marine Geology and Environment, Institute of Oceanology, Chinese Academy of Sciences, Qingdao 266071, China [2]Faculty of Geo-Resources and lnformation, China University of Petroleum, Qingdao 266555, China [3]Graduate University of Chinese Academy of Sciences, Beijing 100049, China [4]Department of Marine Science, Coastal Carolina University, P.O. Box 261954, Conway, SC 29528, USA |
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| Abstract: | 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 5 500 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 5 500 a BP cold event might be resulted from orbital
forcing and changes in solar activity. |
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| Keywords: | 5 500 a BP cold event grain-size East Asian winter monsoon mid-Holocene East China Sea |
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