TY - JOUR T1 - Flux and fate of Yangtze river sediment delivered to the East China Sea JF - Geomorphology Y1 - 2007 A1 - Liu, J. P. A1 - Xu, K. H. A1 - Li, A. C. A1 - Milliman, J. D. A1 - Velozzi, D. M. A1 - Xiao, S. B. A1 - Yang, Z. S. AB - Numerous cores and dating show the Yangtze River has accumulated about 1.16 x 10(12) t sediment in its delta plain and proximal subaqueous delta during Holocene. High-resolution seismic profiling and coring in the southern East China Sea during 2003 and 2004 cruises has revealed an elongated (similar to 800 km) distal subaqueous mud wedge extending from the Yangtze River mouth southward off the Zhejiang and Fujian coasts into the Taiwan Strait. Overlying what appears to be a transgressive sand layer, this distal clinoform thins offshore, from similar to 40 in thickness between the 20 and 30 m water depth to < 1-2 in between 60 and 90 m water depth, corresponding to an across shelf distance of less than 100 km. Total volume of this distal mud wedge is about 4.5 x 10(11) m(3), equivalent to similar to 5.4 x 10(11) t of sediment. Most of the sediment in this mud wedge comes from the Yangtze River, with some input presumably coming from local smaller rivers. Thus, the total Yangtze-derived sediments accumulated in its deltaic system and East China Sea inner shelf have amounted to about 1.7 x 10(12) t. Preliminary analyses suggest this longshore and across-shelf transported clinoform mainly formed in the past 7000 yrs after postglacial sea level reached its mid-Holocene highstand, and after re-intensification of the Chinese longshore current system. Sedimentation accumulation apparently increased around 2000 yrs BP, reflecting the evolution of the Yangtze estuary and increased land erosion due to human activities, such as fanning and deforestation. The southward-flowing China Coastal Current, the northward-flowing Taiwan Warm Current, and the Kuroshio Current appear to have played critical roles in transporting and trapping most of Yangtze-derived materials in the inner shelf, and hence preventing the sediment escape into the deep ocean. (c) 2006 Elsevier B.V. All rights reserved. VL - 85 IS - 3-4 N1 - 244vyTimes Cited:286Cited References Count:84 JO - Flux and fate of Yangtze river sediment delivered to the East China Sea ER - TY - JOUR T1 - Coherence between solar activity and the East Asian winter monsoon variability in the past 8000 years from Yangtze River-derived mud in the East China Sea JF - Palaeogeography Palaeoclimatology Palaeoecology Y1 - 2006 A1 - Xiao, S. B. A1 - Li, A. C. A1 - Liu, J. P. A1 - Chen, M. H. A1 - Xie, Q. A1 - Jiang, F. Q. A1 - Li, T. G. A1 - Xiang, R. A1 - Chen, Z. AB - AMS(14)C dating and grain-size analysis for Core PC-6, located in the middle of a mud area on the inner shelf of the East China Sea (ECS), were used to rebuild the Holocene history of the East Asian winter monsoon (EAWM). The 7.5-m core recorded the history of environmental changes during the postglacial transgression. The core's mud section (the upper 450 cm) has been formed mainly by suspended sediment delivered from the Yangtze River mouth by the ECS Winter Coastal Current (ECSWCC) since 7.6 kyr BP. Using a mathematical method called "grain size vs. standard deviatioW', we can divide the Core PC-6's grain-size distribution into two populations at about 28 mu m. The fine population (< 28 mu m) is considered to be transported by the ECSWCC as suspended loads. Content of the fine population changes little and represents a stable sedimentary environment in accord with the present situation. Thus, variation of mean grain-size from the fine population would reflect the strength of ECSWCC, which is mainly controlled by the East Asian winter monsoon.Abrupt increasing mean grain size in the mud section is inferred to be transported by sudden strengthened ECSWCC, which was caused by the strengthened EAWM. Thus, the high resolution mean grain-size variation might serve as a proxy for reconstruction of the EAWM. A good correlation between sunspot change and the mean grain-size of suspended fine population suggests that one of the primary controls on centennial- to decadal-scale changes of the EAWM in the past 8 ka is the variations of sun irradiance, i.e., the EAWM will increase in intensity when the number of sunspots decreases. Spectral analyses of the mean grain-size time series of Core PC-6 show statistically significant periodicities centering on 2463, 1368, 128, 106, 100, 88-91, 7678, and 70-72 years. The EAWM and the East Asian summer monsoon (EASM) agree with each other well on these cycles, and the East Asian Monsoon (EAM) and the Indian Monsoon also share in concurrent cycles in Holocene, which are in accord with the changes of the sun irradiance. (c) 2005 Elsevier B.V. All rights reserved. VL - 237 IS - 2-4 N1 - 072kpTimes Cited:52Cited References Count:61 JO - Coherence between solar activity and the East Asian winter monsoon variability in the past 8000 years from Yangtze River-derived mud in the East China Sea ER - TY - JOUR T1 - New evidence for remnant deposits recorded by columnar sediments in the shelf of the northern South China Sea JF - Marine Geology & Quaternary Geology Y1 - 2006 A1 - Xiao, S. B. A1 - Chen, M. H. A1 - Lu, J. VL - 26 SN - 0256-1492 IS - 3 N1 - id: 568 JO - New evidence for remnant deposits recorded by columnar sediments in the shelf of the northern South China Sea ER - TY - JOUR T1 - Geochemical characteristics of recent 2 ka mud on the inner shelf of the East China Sea JF - GEOCHIMICA Y1 - 2005 A1 - Xiao, S. B. A1 - Li, A. C. A1 - Jiang, F. A1 - Xu, F. J. A1 - Zheng, F. A1 - Chen, Z. KW - East China Sea continental shelf KW - factor analysis KW - geochemical characteristics KW - particle size AB - The particle size of DD2 in the northern part of the muddy area along the continental margin of the East China Sea was analyzed. AMS 14 C age test and the main elements, trace elements The relationship between the content of each element and the particle size was discussed and analyzed. The relationship between them was discussed by R factor analysis. Studies have shown that nearly 2 ka to DD2 The majority of the main elements and trace elements in the pores are stable; the content of most of the elements with the grain size becomes increasing, while the content of Sr and SiO 2 The decreasing tendency of CaO, Na 2 O, Hf, Zr and Ti is poor in particle size. The results of factor analysis show that the chemical composition of DD2 pore can be It is divided into four kinds of combination types: the main characteristics of the distribution of elements in sediments are reflected, and the samples are not treated by salt beforehand to cause the combination of main elements and trace elements The Zr, Hf and Nb elements are enriched in the specific particle size components (silt), and the addition of calcareous biological components and the redistribution of elements during early diagenesis Wait. The results show that Rb, Cu, Ni, V, P, Sc, Fe 2 O 3 , Cr, K 2 O, Nb, Co, Th, Ti and Al 2 O 3 are relatively inactive elements in DD 2 pores, They can be compared with the modern Yangtze River, the Yellow River sediments, for genetic analysis. The Ti J Zr and Cr J Th ratios indicate that the pore deposits are mainly derived from the granitic Source area. VL - 34 IS - 6 N1 - id: 570 JO - Geochemical characteristics of recent 2 ka mud on the inner shelf of the East China Sea ER - TY - JOUR T1 - Provenance analysis of mud along the Min-zhe coast since 2 ka BP JF - Acta Sedimentologica Sinica Y1 - 2005 A1 - Xiao, S. B. A1 - Li, A. C. A1 - Jiang, F. VL - 23 IS - 22 N1 - id: 567 JO - Provenance analysis of mud along the Min-zhe coast since 2 ka BP ER - TY - JOUR T1 - Recent 2000-year geological records of mud in the inner shelf of the East China Sea and their climatic implications JF - Chinese Science Bulletin Y1 - 2005 A1 - Xiao, S. B. A1 - Li, A. C. A1 - Jiang, F. Q. A1 - Li, T. G. A1 - Huang, P. A1 - Xu, Z. K. AB - AXIS(14)C dating and grain-size analysis for Core DD2, located at the north of the Yangtze River-derived mud off the Zhejiang-Fujian coasts in the inner shelf of the East China Sea, provide us a high-resolution grain-size distribution curve varying with depth and time. Data in the upper mud layer of Core DD2 indicate that there are at least 9 abrupt grain-size increasing in recent 2000 years, with each corresponding very well with the low-temperature events in Chinese history, which might result from the periodical strengthening of the East Asian Winter Monsoon (EAWM), including the first-revealed maximum temperature lowering event at around 990 a BP. At the same time, the finer grain size section in Core DD2 agrees well with the Sui-Tang Warming Period (600-1000 a AD) defined previously by Zhu Kezhen, during which the climate had a warm, cold and warm fluctuation, with a dominated cooling period of 750-850 a AD. The Little Ice Age (LIA) can also be identified in the core. It starts around 1450 a AD and was followed by a subsequent cooling events at 1510, 1670 and 1840 a AD. Timing of these cold events revealed here still needs to be further verified owing to some current uncertainty of dating we used in this study. VL - 50 IS - 5 N1 - 923yeTimes Cited:20Cited References Count:58 JO - Recent 2000-year geological records of mud in the inner shelf of the East China Sea and their climatic implications ER - TY - JOUR T1 - Recent 8 ka mud records of the East Asian Winter Monsoon from the inner shelf of the East China Sea JF - Earth Science - Journal of China University of Geosciences Y1 - 2005 A1 - Xiao, S. B. A1 - Li, A. C. A1 - Chen, M. H. A1 - Liu, J. P. A1 - Jiang, F. G. A1 - Li, T. G. A1 - Xie, Q. A1 - Xiang, R. A1 - Chen, Z. VL - 30 IS - 5 N1 - id: 569 JO - Recent 8 ka mud records of the East Asian Winter Monsoon from the inner shelf of the East China Sea ER -