干旱区生态环境知识资源中心(Arid): 塔克拉玛干沙漠大气降尘粒度特征----以塔里木沙漠公路沿线为例

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	塔克拉玛干沙漠大气降尘粒度特征----以塔里木沙漠公路沿线为例
其他题名	Study on Grain Size Characteristics of Dustfall in the Taklimakan Desert--A Case Study along the Tarim Desert Highway
	孙艳伟; 李生宇; 徐新文; 李莹; 范冬冬
来源期刊	干旱区研究
ISSN	1001-4675
出版年	2010
卷号	27 期号:5 页码:785-792
中文摘要	选择塔里木沙漠公路沿线典型下垫面,通过连续野外定点观测,室内粒度分析等手段,研究塔克拉玛干沙漠腹地与复合纵向沙垄区不同地貌部位近地表大气降尘的粒度特征及其空间分异规律.结果发现:沙漠公路沿线大气降尘的平均粒径在3.28Phi~3.47Phi之间,以细砂,极细砂为主,粒径分布呈双峰态,表明降尘来源的多样性.沿线不同下垫面降尘中粒径<50mum的细粒物质组成差异明显,位于沙漠北部和中部开阔的垄间区是沙尘的潜在源地.复合纵向沙垄区不同地貌部位的降尘细粒物质组成(粒径<50mum)差异明显,垄间区降尘中的细粒物质含量最高.非尘暴降尘较之尘暴降尘偏细,粉砂和黏土含量,分选性更差.大气沉降颗粒的粒度分形维数可以从整体上反映出颗粒物的粒度分布和级配特征,是描述大气沉降颗粒物粒度特征的重要指标
英文摘要	Study on the laws of wind-blown sand movement and its relationships with the geomorphological settings and surface materials are one of the important fields of desert researches. In this study, the typical underlaying surface along the Tarim Desert Highway is selected as the study area. Grain size characteristics and spatial distribution of dustfall were studied by the means of continuous spot observation along the complex longitudinal dune chains in the hinterland of the Taklimakan Desert and the particle size analysis in laboratory. The results show that the average grain size of dustfall along the Tarim Desert Highway varies in a range from 3.28Phi to 3.47Phi.The dustfall is dominated by fine sand and very fine sand, and the grain size distribution curves are bimodal, which reveal that the sources of dustfall are various. On the larger scale, the difference of composition of fine material(< 50 mum) is obvious among different underlaying surfaces. The characteristics of underlaying surface and its composition are the determining factors of wind-blown sand-dust. On the small scale, the particle size of dustfall in the inter-dune areas in the complex longitudinal dune region is the finest compared with that in other regions. The fine material content in the inter-dune areas is the highest among all the geomorphological positions. So it is considered that the inter-dune areas in the northern and central parts of the desert are the potential sources of aeolian dust. Dust collected under non-dust weather is poorer in sorting, coarser and has higher silt and clay content than that collected under dust weather, and the curves of grain size distribution of both are bimodal. This result reveals that dustfall is the mixture from the local area and the remote regions. The correlation analysis between the fractal dimensions and the particle size parameters reveals that the fractal dimensions can be effectively indicators of the grain size distribution and composition characteristics of aeolian dust, and they are one of the important indices for describing grain size characteristics of aeolian dust. Compared with the average grain size of sand on the surface in the whole study area,it could be concluded that the Tarim Desert is the main source of aeolian dust, and fine material(<50 mum) could be floated to the regions far away from its source
中文关键词	大气降尘 ; 粒度特征 ; 分形维数 ; 塔里木沙漠公路 ; 塔克拉玛干沙漠
英文关键词	dustfall grain size characteristic fractal dimension the Tarim Desert Highway Taklimakan Desert
语种	中文
国家	中国
收录类别	CSCD
WOS类目	METEOROLOGY ATMOSPHERIC SCIENCES
WOS研究方向	Meteorology & Atmospheric Sciences
CSCD记录号	CSCD:4024676
来源机构	中国科学院新疆生态与地理研究所
资源类型	期刊论文
条目标识符	http://119.78.100.177/qdio/handle/2XILL650/225094
作者单位	中国科学院新疆生态与地理研究所, 乌鲁木齐, 新疆 830011, 中国
推荐引用方式 GB/T 7714	孙艳伟,李生宇,徐新文,等. 塔克拉玛干沙漠大气降尘粒度特征----以塔里木沙漠公路沿线为例[J]. 中国科学院新疆生态与地理研究所,2010,27(5):785-792.
APA	孙艳伟,李生宇,徐新文,李莹,&范冬冬.(2010).塔克拉玛干沙漠大气降尘粒度特征----以塔里木沙漠公路沿线为例.干旱区研究,27(5),785-792.
MLA	孙艳伟,et al."塔克拉玛干沙漠大气降尘粒度特征----以塔里木沙漠公路沿线为例".干旱区研究 27.5(2010):785-792.