|
|
|
| Characteristics and sources of carbonaceous aerosols in spring at four background sites in South China. |
|
|
|
|
Abstract Intensive atmospheric measurements were conducted in spring simultaneously at four background sites in South China: Jianfengling (JFL) on Hainan Island, Hok Tsui (HT) in Hong Kong, Lin’an (LA) in Zhejiang province and Tengchong (TC) in Yunnan Province. PM2.5 mass concentrations and carbonaceous species, including organic carbon (OC), elemental carbon (EC) and levoglucosan (LG), were determined. These species exhibited distinct characteristics at each site due to different pollution sources and transport processes affecting the various sites. Higher OC and EC levels were found at TC and LA, indicating that these sites were under significant regional-scale influence by primary emissions, such as biomass burning and fossil fuel combustion, associated with long-range transport. The contribution of biomass burning to OC was estimated to be as high as 73% at TC, using a simplified receptor based model. High OC/EC ratios and low carbonaceous species levels at JFL may have resulted from secondary processes and primary biogenic emissions, while low carbonaceous aerosol loadings and good correlations between different species at HT reflected the background pollution level on the regional scale.
|
|
Received: 05 March 2010
|
|
|
|
|
|
|
