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Formation of the modern current system in the East China Sea since the early Holocene and its relationship with sea level and the monsoon system
Zheng Xufeng1,2,3; Li Anchun2; Wan Shiming2; Jiang Fuqing2; Yin Xueming2; Lu Jian2
2015-07-01
发表期刊CHINESE JOURNAL OF OCEANOLOGY AND LIMNOLOGY
卷号33期号:4页码:1062-1071
文章类型Article
摘要The Okinawa Trough is a natural laboratory for the study of air-sea interaction and paleoenvironmental change. It has been demonstrated that present offshore export of particles in the bottom nepheloid layer occur primarily with downwelling from the northeast winter monsoon, which is inhibited by a transverse circulation pattern in summer. This current system was very different during the Last Glacial Maximum owing to low sea level (-120 m) and exposure of a large shelf area. We collected sediment core Oki01 from the middle Okinawa Trough during 2012 using R/V Kexue No. 1 to elucidate the timing and cause of the current system transition in the East China Sea. Clay mineral, dry density, and elemental (Ti, Ca) composition of core Oki01 was analyzed. The results indicate that clay minerals derived mainly from the Huanghe (Yellow) and the Changjiang (Yangtze) Rivers during 16.0-11.6 ka, and the modern current system in the East China Sea formed beginning in the early Holocene. Therefore, mixing of East China Sea continental shelf, Changjiang River and partially Taiwan Island sediment are the major contributors. The decrease of log(Ti/Ca) and alternating provenance since the early Holocene indicate less sediment from the East China in summer because of resistance of the modern current system, i.e., a "water barrier" and upwelling. Conversely, sediment delivery persists in winter and log(Ti/Ca) indicates the winter monsoon signal since the early Holocene. Our evidence also suggests that sediment from Taiwan Island could be transported by the Kuroshio Current to the middle Okinawa Trough, where it mingles with winter monsoon-induced export of sediment from the Changjiang River and East China Sea continental shelf. Although the present research advances understanding of the evolutionary history of paleoenvironmental change in the Okinawa Trough, more sediment cores should be retrieved over wide areas to construct a larger scenario.
关键词Monsoon Modern Current System Okinawa Trough Kuroshio Current
DOI10.1007/s00343-015-4089-7
收录类别SCI
语种英语
WOS记录号WOS:000357037100026
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被引频次:3[WOS]   [WOS记录]     [WOS相关记录]
文献类型期刊论文
条目标识符http://ir.qdio.ac.cn/handle/337002/33087
专题海洋地质与环境重点实验室
作者单位1.Chinese Acad Sci, S China Sea Inst Oceanol, Key Lab Marginal Sea Geol, Guangzhou 510301, Peoples R China
2.Chinese Acad Sci, Key Lab Marine Geol & Environm, Inst Oceanol, Qingdao 266071, Peoples R China
3.Univ Chinese Acad Sci, Beijing 100049, Peoples R China
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Zheng Xufeng,Li Anchun,Wan Shiming,et al. Formation of the modern current system in the East China Sea since the early Holocene and its relationship with sea level and the monsoon system[J]. CHINESE JOURNAL OF OCEANOLOGY AND LIMNOLOGY,2015,33(4):1062-1071.
APA Zheng Xufeng,Li Anchun,Wan Shiming,Jiang Fuqing,Yin Xueming,&Lu Jian.(2015).Formation of the modern current system in the East China Sea since the early Holocene and its relationship with sea level and the monsoon system.CHINESE JOURNAL OF OCEANOLOGY AND LIMNOLOGY,33(4),1062-1071.
MLA Zheng Xufeng,et al."Formation of the modern current system in the East China Sea since the early Holocene and its relationship with sea level and the monsoon system".CHINESE JOURNAL OF OCEANOLOGY AND LIMNOLOGY 33.4(2015):1062-1071.
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