Environmental anomalies in the northeastern East China Sea during the last 3 000 years:implications for El Nio activity in the Holocene

IOCAS-IR

	Environmental anomalies in the northeastern East China Sea during the last 3 000 years:implications for El Nio activity in the Holocene
	Chang FM(常凤鸣); Li TG(李铁刚); Zhuang LH(庄丽华); Yan J(阎军)
发表期刊	Chinese Journal of Oceanology and Limnology
ISSN	0254-4059
	2010-02-15
出版年	2010
卷号	v.28 期号:01 页码:192-202
文献类型	CNKI期刊论文
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 Nio periods,we suggest that the anomalous environmental conditions in the northeastern ECS may imply intensified El Nio activity during the late Holocene.
关键词	late Holocene environmental anomalies El Nio northeastern East China Sea paleoproductivity sea-surface temperature
CNKI专辑号	A;
CNKI专辑名称	基础科学;
CNKI专题号	A009;A010;
CNKI专题名称	气象学;海洋学;
分类号	P732
收录类别	中科院核心
语种	英文;
资助项目(基金）	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)
文献类型	CNKI期刊论文
条目标识符	http://ir.qdio.ac.cn/handle/337002/192248
专题	中国科学院海洋研究所
作者单位	KeyLaboratoryofMarineGeologyandEnvironment,InstituteofOceanology,ChineseAcademyofSciences
推荐引用方式 GB/T 7714	Chang FM,Li TG,Zhuang LH,et al. Environmental anomalies in the northeastern East China Sea during the last 3 000 years:implications for El Nio activity in the Holocene. 2010.