Chemical characteristics of carbonaceous aerosols during dust storms over Xi’an in China
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- 作者：Xuxiang Li (1)
Junji Cao (1) (2)
Judith Chow (3)
Yongming Han (2)
Shuncheng Lee (4)
John Watson (3) - 关键词：carbonate carbon ; organic carbon ; elemental carbon ; dust storm
- 刊名：Advances in Atmospheric Sciences
- 出版年：2008
- 出版时间：September 2008
- 年：2008
- 卷：25
- 期：5
- 页码：847-855
- 全文大小：767KB
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Junji Cao (1) (2)
Judith Chow (3)
Yongming Han (2)
Shuncheng Lee (4)
John Watson (3)
1. Department of Environmental Science and Technology, Xi’an Jiaotong University, Xi’an, 710049, China
2. State Key Lab of Loess & Quaternary Geology, Institute of Earth Environment, Chinese Academy of Sciences, Xi’an, 710075, China
3. Desert Research Institute, Reno, NV, USA
4. The Hong Kong Polytechnic University, Hong Kong, China - ISSN：1861-9533
文摘
Characterization of carbonaceous aerosols including CC (carbonate carbon), OC (organic carbon), and EC (elemental carbon) were investigated at Xi’an, China, near Asian dust source regions in spring 2002. OC varied between 8.2 and 63.7 μg m, while EC ranged between 2.4 and 17.2 μ m during the observation period. OC variations followed a similar pattern to EC and the correlation coefficient between OC and EC is 0.89 (n=31). The average percentage of total carbon (TC, sum of CC, OC, and EC) in PM2.5 during dust storm (DS) events was 13.6%, which is lower than that during non-dust storm (NDS) periods (22.7%). CC, OC, and EC accounted for 12.9%, 70.7%, and 16.4% of TC during DS events, respectively. The average ratio of OC/EC was 5.0 in DS events and 3.3 in NDS periods. The OC-EC correlation (R 2=0.76, n=6) was good in DS events, while it was stronger (R 2=0.90, n=25) in NDS periods. The percentage of water-soluble OC (WSOC) in TC accounted for 15.7%, and varied between 13.3% and 22.3% during DS events. The distribution of eight carbon fractions indicated that local emissions such as motor vehicle exhaust were the dominant contributors to carbonaceous particles. During DS events, soil dust dominated the chemical composition, contributing 69% to the PM2.5 mass, followed by organic matter (12.8%), sulfate (4%), EC (2.2%), and chloride (1.6%). Consequently, CC was mainly entrained by Asian dust. However, even in the atmosphere near Asian dust source regions, OC and EC in atmospheric dust were controlled by local emission rather than the transport of Asian dust.