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JOURNAL OF DESERT RESEARCH
Weather and Climate     
Aerosol Optical Properties during Dusty Events in Source and Downwind Regions
YU Xing-na1,2, ZHANG Hui-juan3, Dengzengrandeng4, Deqingyangzong5, KANG Na1,2
1.Key Laboratory of Meteorological Disaster of Ministry of Education, Nanjing University of Information Science & Technology, Nanjing 210044, China;
2.School of Atmospheric Physics, Nanjing University of Information Science & Technology, Nanjing 210044, China;
3.Meteorological Observatory of Xiaogan, Xiaogan 432000, Hubei, China;
4.Meteorological Bureau of Lazi County, Xigaze City, The Tibet Autonomous Region, Lazi 858100, China;
5.Meteorological Bureau of Chayu County, Linzhi City, The Tibet Autonomous Region, Chayu 860600, China
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Abstract  

The purpose of this study is to investigate the variation of aerosol optical properties during the dust long-range transport process. A comparison of aerosol optical properties was performed between Dunhuang, Yulin as source regions and Beijing, Xianghe as downwind regions during dusty events from 2001 to 2008. Compared with the fine particles, the coarse particles (r>0.6 μm) became relatively more important for the total extinction because of the appearance of considerable coarse particles during dust events. The extinction of coarse particles (r>0.6 μm) accounted for about 85.2% of the total particles at 440, 670, 870 and 1 020 nm over dust source regions, and 65.8% over downwind regions. During dusty days, the aerosol optical depth showed a high value over source and downwind regions. Angstrom indexes over source regions were smaller than on downwind regions, and decreased to zero or negative when the severe dust storm occurred. Coarse modes was the principal in aerosol volume size distribution spectra over source and downwind regions, with the volume concentration ratio of coarse to fine modes being 23 and 33 in source regions, and decreasing to about 8 in downwind regions. The single scattering albedo showed an increasing trend with wavelengths during dusty days, being 0.95 and 0.92 over source and downwind regions respectively. The average asymmetry factor at the four wavelengths in dust source regions (0.73) was larger than that in downwind regions (0.70).

Key words:  dust      aerosol      long-range transport      optical properties     
Received:  15 May 2012      Published:  05 June 2012
ZTFLH:  X513  

Cite this article: 

YU Xing-na1,2, ZHANG Hui-juan3, Dengzengrandeng4, Deqingyangzong5, KANG Na1,2. Aerosol Optical Properties during Dusty Events in Source and Downwind Regions. JOURNAL OF DESERT RESEARCH, 2012, 32(6): 1710-1715.

URL: 

http://www.desert.ac.cn/EN/     OR     http://www.desert.ac.cn/EN/Y2012/V32/I6/1710

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