Spatial and seasonal distributions of atmospheric carbonaceous aerosols in pearl river delta region, china
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- 作者：Junji Cao ; Shuncheng Lee ; Kinfai Ho ; Shichun Zou ; Xiaoye Zhang ; Jianguo Pan
- 关键词：PM2.5 ; PM10 ; Organic carbon ; Elemental carbon ; OC/EC ratio ; Pearl River Delta Region
- 刊名：China Particuology
- 出版年：2003
- 出版时间：April 2003
- 年：2003
- 卷：1
- 期：1
- 页码：33-37
- 全文大小：151 K
文摘
Concentrations and spatial distributions of organic carbon (OC) and elemental carbon (EC) in atmospheric particles were measured at 8 sites in four cities (Hong Kong, Guangzhou, Shenzhen and Zhuhai) of Pearl River Delta Region (PRDR), China during 2001 winter period and 2002 summer period. PM2.5 (particle diameter smaller than 2.5 μm) and PM10 (particle diameter smaller than 10 μm) samples were collected on pre-fired quartz filters with mini-volume samplers and analyzed using thermal optical reflectance (TOR) method. The average PM2.5 and PM10 level were 60.1 and 93.1 μg·m−3, respectively, with PM2.5 constituting 65.3 % of the PM10 mass. The average OC and EC concentrations in PM2.5 were 12.0 and 5.1 μg·m−3, respectively, while those in PM10 were 16.0 and 6.5 μg·m−3, respectively. The carbonaceous aerosol accounted for 37.2 % of the PM2.5 and 32.8 % of the PM10. The highest concentrations of OC and EC were observed at Guangzhou city in both winter and summer seasons. The average OC/EC ratios were 2.4 for PM2.5 and 2.5 for PM10, indicating the presence of secondary organic aerosols. The OC and EC in PRDR were found to be strongly correlated (correlation coefficients > 0.6), which implied that similar emission source contribute to the ambient carbon particles.