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学科主题: Oceanography
题名: ITCZ and ENSO pacing on East Asian winter monsoon variation during the Holocene: Sedimentological evidence from the Okinawa Trough
作者: Zheng, XF ; Li, AC ; Wan, SM ; Jiang, FQ ; Kao, SJ ; Johnson, C
通讯作者: acli@qdio.ac.cn
刊名: JOURNAL OF GEOPHYSICAL RESEARCH-OCEANS
发表日期: 2014
卷: 119, 期:7, 页:4410-4429
收录类别: sci
部门归属: [Zheng, Xufeng ; Li, Anchun ; Wan, Shiming ; Jiang, Fuqing] Chinese Acad Sci, Inst Oceanol, Key Lab Marine Geol & Environm, Qingdao, Peoples R China ; [Zheng, Xufeng] Chinese Acad Sci, South China Sea Inst Oceanol, Key Lab Marginal Sea Geol, Guangzhou, Guangdong, Peoples R China ; [Kao, Shuh Ji] Xiamen Univ, State Key Lab Marine Environm Sci, Xiamen, Peoples R China ; [Johnson, Cody] Louisiana State Univ, Dept Civil & Environm Engn, Baton Rouge, LA 70803 USA
项目归属: 海洋地质
资助者: National Natural Science Foundation of China [40776030, 41376057]; Strategic Priority Research Program of the Chinese Academy of Sciences [XDA11030302]
摘要: Deep-sea fan sediments provide an excellent geological archive for paleoenvironment reconstruction. Grain size, clay mineral and elemental (Ti, Fe, Ca) compositions were measured for a core retrieved from a submarine fan in the Okinawa Trough. Varimax-rotated Principal Component Analysis (V-PCA) on time-evolution of grain size spectrum reveals that, since the Holocene, sediment was transported mainly by the benthic nepheloid layer (33%) and upper layers (33%) which is driven by the East Asian winter monsoon (EAWM). The intensification of the Kuroshio Current during the Holocene, masks the fluvial signal of the summer monsoon and obstructs clay minerals derived from the Yellow River, a major contributor prior to 12 ka BP. A new grain size index (GSI), which represents the EAWM well, exhibits a negative correlation with the delta O-18 record in Dongge Cave, China during the Holocene when sea level was relatively steady. This anti-correlation suggests the southward migration of the Intertropical Convergence Zone (ITCZ). The consistency among our records and rainfall records in Peru, Ti counts in the Cariaco Basin, monsoon records in Oman and the averaged summer insolation pattern at 30 degrees N further support the ITCZ's impact on monsoon systems globally. Cross-Correlation Analyses for GSI and log(Ti/Ca) against delta O-18 record in Dongge Cave reveal a decoupling between the East Asian winter and summer monsoon during 5500-2500 cal yr BP, with greater complexity in the last 2500 years. This can be attributed to exacerbated ENSO mode fluctuations and possibly anthropogenic interference superimposed on insolation and ITCZ forcing.
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WOS记录号: WOS:000340415500024
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内容类型: 期刊论文
URI标识: http://ir.scsio.ac.cn/handle/344004/10613
Appears in Collections:中科院边缘海地质重点实验室_期刊论文

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Recommended Citation:
Zheng, XF; Li, AC; Wan, SM; Jiang, FQ; Kao, SJ; Johnson, C.ITCZ and ENSO pacing on East Asian winter monsoon variation during the Holocene: Sedimentological evidence from the Okinawa Trough,JOURNAL OF GEOPHYSICAL RESEARCH-OCEANS,2014,119(7):4410-4429
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