| Environmental anomalies in the northeastern East China Sea during the last 3 000 years:implications for El Nio activity in the Holocene |
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| 引用本文： | 常凤鸣,李铁刚,庄丽华,阎军.Environmental anomalies in the northeastern East China Sea during the last 3 000 years:implications for El Nio activity in the Holocene[J].中国海洋与湖沼学报,2010(1). |
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| 作者姓名： | 常凤鸣 李铁刚 庄丽华 阎军 |
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| 作者单位： | Laboratory;Marine;Geology;Environment;Institute;Oceanology;Chinese;Academy;Sciences; |
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| 基金项目： | Supported by the Knowledge Innovation Program of Chinese Academy of Sciences (Project No. KZCX2-YW-221);;the State Key Basic Research and Development Plan of China (Project No2007CB815903);;the National Natural Science Foundation of China (Project No. 40506015) |
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| 摘 要： | To reconstruct the productivity changes for the last 10 500 a in the northeastern East China Sea (ECS),biogenic compounds (such as carbonate,organic carbon and opal),marine micropaleontological fossils (planktonic foraminifera,benthic foraminifera,radiolarian and silicoflagellate) and the compositional characters of benthic foraminifera fauna analyses were carried out on a sediment core DOC082 obtained from the western slope of Okinawa Trough (29°13.93'N,128°08.53'E;1 128 m water depth).The long-term changes of biogenic and micropaleontological proxies display some similarities through the last 10 500 a,which show three different phases:lower values are recorded during the early and middle Holocene (before about 4 000 a BP),followed by an abrupt and remarkable increase at about 4 000 a BP,the late Holocene (after about 3 000 a BP) is characterized by continuously high values.The multi-proxy data of paleoproductivity and percents of benthic foraminifera genera (Uvigerina and Bulimina) show that during the early and middle Holocene (10 500-4 000 a BP) productivity was relatively low with a sudden and distinct increase at about 4 000 a BP,and the late Holocene (3 400-0 a BP) is marked by significantly higher productivity.Also,the radiolarian-based sea surface temperature (SST) records reveal a distinct decline in SST in the late Holocene after 3 200 a BP,very different from the early and middle Holocene.For the last 3 000 a,the enhanced biological productivity and distinctly lower SST indicate a major change of oceanographic conditions in the northeastern ECS.These marine environmental anomalies are consistent with other paleoclimatic records for the late Holocene in the Chinese continent and its surrounding regions.After analyzing the mechanisms of modern productivity and SST changes in the northeastern ECS,and based on the climatic anomalies in the Chinese continent and variations in the Kuroshio Current during modern El Nio periods,we suggest that the anomalous environmental conditions in the northeastern ECS may imply intensified El Nio activity during the late Holocene.
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| 关 键 词： | late Holocene environmental anomalies El Nio northeastern East China Sea paleoproductivity sea-surface temperature |
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