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学科主题: Geosciences, Multidisciplinary; Soil Science; Water Resources
题名: Bimodal grain-size distribution of Chinese loess, and its palaeoclimatic implications
作者: Sun, DH ; Bloemendal, J ; Rea, DK ; An, ZS ; Vandenberghe, J ; Lu, HY ; Su, RX ; Liu, TS
通讯作者: sundh@scsio.ac.cn
关键词: loess ; grain size ; atmospheric circulation ; China
刊名: CATENA
发表日期: 2004
卷: 55, 期:3, 页:325-340
收录类别: sci
部门归属: Chinese Acad Sci, S China Sea Inst Oceanog, Guangzhou 510301, Peoples R China; Chinese Acad Sci, Inst Earth Environm, State Key Lab Loess & Quaternary Geol, Xian 710075, Peoples R China; Univ Liverpool, Dept Geog, Liverpool L69 3BX, Merseyside, England; Univ Michigan, Dept Geol Sci, Ann Arbor, MI 48109 USA; Free Univ Amsterdam, Fac Earth Sci, NL-1081 HV Amsterdam, Netherlands; Chinese Acad Sci, Inst Geol, Beijing 100029, Peoples R China
项目归属: 海洋地质
摘要: Grain-size analysis indicates that Chinese loess generally shows a bimodal distribution with a coarse and a fine component. The coarse component, comprising the main part of the loess, has pronounced kurtosis and is well sorted, which is interpreted to be the product of dust storms generated by low-altitude northwesterly winds. Its grain-size reflects the strength of the low-altitude circulation in the dust seasons of the year, and its percentage provides an indicator of the source area aridity and the frequency of dust storms. Conversely, the fine component has a wide grain-size range and is poorly sorted. Sedimentary illustrations based on the grain-size distribution characteristics of bulk samples and of detrital quartz suggest that the fine component probably represents the background dust load of the atmosphere and is mainly transported by high-altitude westerly airstreams. Its grain-size provides an estimate of the westerly air stream intensity. The coarse and fine components of a loess sample can be mathematically separated by fitting a designated mathematical distribution function to the measured grain-size data, and this procedure constitutes an approach for reconstructing the palaeowind system of Northern China. (C) 2003 Elsevier B.V. All rights reserved.
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WOS记录号: WOS:000188981300004
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内容类型: 期刊论文
URI标识: http://ir.scsio.ac.cn/handle/344004/4832
Appears in Collections:中科院边缘海地质重点实验室_期刊论文

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Sun, DH; Bloemendal, J; Rea, DK; An, ZS; Vandenberghe, J; Lu, HY; Su, RX; Liu, TS.Bimodal grain-size distribution of Chinese loess, and its palaeoclimatic implications,CATENA,2004,55(3):325-340
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