Characteristics and provenance of dustfall during an unusual floating dust event
Characteristics and provenance of dustfall during an unusual floating dust event
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异常浮尘事件期间降尘的特征和来源
DOI：
10.1016/j.atmosenv.2010.06.027
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发表时间：
2010-09
影响因子：
5
通讯作者：
Qu, Z. Q.
中科院分区：
文献类型：
--
作者：
Liu, L. Y.;Xu, H. Y.;Lue, Y. L.;Zhang, X. X.;Cao, H. W.;Wang, L.;Guo, L. L.;Yang, Y. Y.;Tang, Y.;Jia, Z. J.;Hu, X.;Gao, S. Y.;Qu, Z. Q.
本研究旨在探讨2006年4月16-17日发生在北京的一次强降尘过程的特征、来源和颗粒物污染。卫星云图显示，沙尘主要来源于内蒙古阿拉善盟东北部，向东南方向经过宁夏北方、内蒙古中部、陕西北方、山西、河北等地。随后沙尘移出中国大陆北京和天津附近。浮尘导致呼和浩特、大同、北京等地空气污染严重。我们测量降尘通过收集灰尘样品，调查颗粒形态，并使用扫描电子显微镜（SEM）的降尘的质量介质直径（MMD）计算。用电子探针和粉末X射线衍射仪分别测定了粉尘颗粒的常量元素和矿物含量。这次降尘的相对丰度为12.5-15.0gm-2，约占北京年降尘总量的10%。北京降尘量达20.5万吨，是近年来观测到的最大值。尘埃粒子多为角形、近角形和近圆形，MMD约为12μm。<10μm的颗粒占54.7%，而细沙粒（大于50μm）占53.7%。粒径大于20μm的颗粒占样品的绝大部分（90.35%）。因此，这次降尘事件的特点是高含量的细砂和粗粉砂颗粒。尘埃粒子中的主要元素是C，O，Si，Al，Fe和Ca，而主要矿物是石英，钠长石，方解石和粘土矿物。
This study aims to investigate the characteristics, provenance, and particle-related pollution of an intense dustfall event that occurred in Beijing on 16–17 April 2006. Satellite images reveal that the aeolian dust originated in northeastern Alxa League of Inner Mongolia and passed southeastward across northern Ningxia, middle Inner Mongolia, northern Shaanxi, Shanxi, and Hebei provinces. The dust then moved out of continental China in the vicinity of Beijing and Tianjin. The floating dust led to severe air pollution in Huhhot, Datong, and Beijing. We measured dustfall by collecting dust samples, investigated particle morphology, and calculated the mass medium diameter (MMD) of the dustfall using a scanning electron microscope (SEM). Major elements and mineral content of the dust particles were determined by electron probe and powder X-ray diffractometer, respectively. The relative abundance of dustfall during this event was 12.5–15.0gm−2, making up about 10% of the total annual dustfall in Beijing. Dustfall amounted to 205 thousand tons in Beijing, the largest amount observed in recent years. The dust particles were mostly angular, subangular and subrounded in morphology, and the MMD was nearly 12μm. Particles <10μm accounted for 54.7% by number, but fine sand particles (larger than 50μm) made up 53.7% by volume. Particles with diameters larger than 20μm made up of the predominant volume of the samples (90.35%). Hence, this dustfall event was characterized by a high content of fine sand and coarse silt particles. The principal elements in the dust particles were C, O, Si, Al, Fe, and Ca, whereas the major minerals were quartz, Na-feldspar, calcite, and clay minerals.
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影响因子：
5
作者：
Chang-Jin Ma;S. Tohno;M. Kasahara
通讯作者：
Chang-Jin Ma;S. Tohno;M. Kasahara
DOI：
10.1029/2003eo460001
发表时间：
2003-11
期刊：
Eos, Transactions American Geophysical Union
影响因子：
--
作者：
Dan Jaffe;Julie Snow;O. Cooper
通讯作者：
Dan Jaffe;Julie Snow;O. Cooper
DOI：
10.1002/cjg2.813
发表时间：
2006
期刊：
Chinese Journal of Geophysics
影响因子：
--
作者：
Z. Qian;Ying Cai;Jing-Tao Liu;Chung-Ming Liu;Dongliang Li;Minhong Song
通讯作者：
Z. Qian;Ying Cai;Jing-Tao Liu;Chung-Ming Liu;Dongliang Li;Minhong Song
影响因子：
6.3
作者：
I. McKendry;A. Macdonald;W. Leaitch;A. Donkelaar;Qiang Zhang;T. Duck;R. Martin
通讯作者：
I. McKendry;A. Macdonald;W. Leaitch;A. Donkelaar;Qiang Zhang;T. Duck;R. Martin
影响因子：
--
作者：
G. Zhuang;Jinghua Guo;Hui Yuan;Chengyi Zhao
通讯作者：
G. Zhuang;Jinghua Guo;Hui Yuan;Chengyi Zhao