Distribution of carbonaceous aerosol during spring 2005 over the horqin sandland in northeastern china

China Particuology Pub Date : 2006-12-01 DOI:10.1016/S1672-2515(07)60282-6

Xuxiang Li , Zhenxing Shen , Junji Cao , Suixin Liu , Chongshu Zhu , Ting Zhang

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引用次数: 16

Abstract

The objective of this study was to characterize the elemental carbon and organic carbon (EC and OC, respectively) content of aerosol particles (PM_2.5) collected at Tongliao, a site in the Horqin Sandland of northeastern China. During spring 2005, the PM_2.5 mass concentration was 126±71 μg·m⁻³, with higher dust concentrations during five dust storms than on non-dusty days (255±77 vs. 106±44 μg·m⁻³). The average OC and EC concentrations in PM_2.5 determined by a thermal/optical reflectance method were 15.7±7.3 μg·m⁻³ and 3.3±1.7 μg·m⁻³, respectively, and carbonaceous aerosol accounted for 9.9% of the PM_2.5 mass during dust storms compared to 21.7% on normal days. The average ratios of OC to EC during dust storms were similar to those on non-dusty days, and the correlation coefficient between OC and EC was high, 0.86. The high OC/EC ratios, the distributions of eight carbon fractions, and the strong relationship between K with OC and EC indicate that rural biomass burning was the dominant contributor to the regional carbonaceous aerosol.

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2005年春季科尔沁沙地碳质气溶胶的分布

本研究的目的是表征在中国东北科尔沁沙地通辽站点收集的气溶胶颗粒(PM2.5)的元素碳和有机碳(EC和OC)含量。2005年春季PM2.5质量浓度为126±71 μg·m−3,5次沙尘暴天气的沙尘浓度均高于非沙尘天气(255±77比106±44 μg·m−3)。热/光反射法测得PM2.5中OC和EC的平均浓度分别为15.7±7.3 μg·m - 3和3.3±1.7 μg·m - 3，含碳气溶胶占PM2.5质量的9.9%，而平日占21.7%。沙尘暴天气OC与EC的平均比值与非沙尘天气相似，OC与EC的相关系数较高，为0.86。高的OC/EC、8个碳组分的分布以及K与OC和EC之间的强相关性表明，农村生物质燃烧是区域碳质气溶胶的主要贡献者。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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China Particuology

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