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Chemical Characteristics of carbonaceous Aerosols During Dust Storms over Xi'an in China

Advances in Atmospheric Sciences 2008年第5期25卷 847-855页

作者：李旭祥曹军骥 Judith CHOW 韩永明李顺诚 John WATSON Department of Environmental Science and Technology Xi'an Jiaotong University Desert Research Institute Reno NV USA State Key Lab of Loess & Quaternary Geology Institute of Earth EnvironmentChinese Academy of Sciences The Hong Kong Polytechnic University

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 63.7μgm^- 3, while EC ranged between 2.4 and 17.2 μ m^-3 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 watersoluble 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 titan the transport of Asian dust.

关键词： carbonate carbon organic carbon elemental carbon dust storm

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Concentrations,Seasonal Variations,and Transport of arbonaceous Aerosols at a Remote Mountainous Region in Western China

Concentrations,Seasonal Variations,and Transport of arbonace...

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第十届全国气溶胶会议暨第六届海峡两岸气溶胶技术研讨会

作者： Jun-Ji Cao 1,Bai-Qing Xu 2,Jian-Qiao He3,Xian-Qin Liu3,Yong-Ming Han1 1 SKLLQG,Institute of Earth Environment,Chinese Academy of Sciences,Xi’an 710075,China 2 Laboratory of Tibetan Environment and Land Surface Processes,Institute of Tibetan Plateau Research,Chinese Academy of Sciences,Beijing 100085,China 3 State Key Laboratory of Cryosphere Sciences,Cold and Arid Regions Environmental and Engineering Research Institute,Chinese Academy of Sciences,Lanzhou 730000,China

carbonaceous aerosol concentrations were determined for samples collected from Muztagh Ata Mountain in western China from December 2003 to February *** carbon（EC） in total suspended particle（TSP） samples varied from 0.004 to 0.174 μg m-3（average = 0.056 μg m-3） while organic carbon（OC） and carbonate carbon（CC） ranged from 0.12 to 2.17 μg m-3 and below detection to 3.57 μg m-3,*** EC and OC concentrations occurred during the winter-spring seasons while CC concentrations were higher during the warmer *** accounted for～7% of the total carbon（TC = EC + OC + CC） during spring and summer and 11% during autumn and winter;EC was the smallest carbonaceous fraction except in winter when CC was the ***/EC ratios varied from 2.9 to 32.1（average = 10.0）,and strong correlations between OC and EC（R2:0.75 to 0.77） in spring and winter suggest their cycles are coupled,but lower correlations in summer（0.39） and autumn（0.57） suggest that biogenic emissions and secondary OC become important as temperatures *** of in air parcel back trajectories indicate that about 0.05 μg m-3 EC,0.42 μg m-3 OC,and 0.10 μg m-3 CC were transported from outside *** Ata has EC concentrations nearly as low as those in polar areas;these may represent a background level for inland *** annual EC concentration was fall in the range and close to the lowest bound of EC contents that recovered from ice core drilled in Muztagh Ata glaciers.

关键词： Elemental carbon Organic carbon carbonate carbon Aerosol Ice core Remote Atmosphere

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