Radiocarbon-Based Source Apportionment of Carbonaceous Aerosols at a Regional Background Site on Hainan Island, South China

详细信息    查看全文

• 作者：Yan-Lin Zhang ; Jun Li ; Gan Zhang ; Peter Zotter ; Ru-Jin Huang ; Jian-Hui Tang ; Lukas Wacker ; Andr茅 S H Pr茅v么t ; S枚nke Szidat
• 刊名：Environmental Science & Technology
• 出版年：2014
• 出版时间：March 4, 2014
• 年：2014
• 卷：48
• 期：5
• 页码：2651-2659
• 全文大小：404K
• 年卷期：v.48,no.5(March 4, 2014)
• ISSN：1520-5851

文摘

To assign fossil and nonfossil contributions to carbonaceous particles, radiocarbon (¹⁴C) measurements were performed on organic carbon (OC), elemental carbon (EC), and water-insoluble OC (WINSOC) of aerosol samples from a regional background site in South China under different seasonal conditions. The average contributions of fossil sources to EC, OC and WINSOC were 38 卤 11%, 19 卤 10%, and 17 卤 10%, respectively, indicating generally a dominance of nonfossil emissions. A higher contribution from fossil sources to EC (51%) and OC (30%) was observed for air-masses transported from Southeast China in fall, associated with large fossil-fuel combustion and vehicle emissions in highly urbanized regions of China. In contrast, an increase of the nonfossil contribution by 5鈥?0% was observed during the periods with enhanced open biomass-burning activities in Southeast Asia or Southeast China. A modified EC tracer method was used to estimate the secondary organic carbon from fossil emissions by determining ¹⁴C-derived fossil WINSOC and fossil EC. This approach indicates a dominating secondary component (70 卤 7%) of fossil OC. Furthermore, contributions of biogenic and biomass-burning emissions to contemporary OC were estimated to be 56 卤 16% and 44 卤 14%, respectively.