Institute of Atmospheric Physics, Chinese Academy of Sciences, Beijing, 100029, People's Republic of China.
Environ Sci Pollut Res Int. 2016 Jul;23(14):13918-30. doi: 10.1007/s11356-016-6538-z. Epub 2016 Apr 4.
Mass concentrations of organic carbon (OC) and elemental carbon (EC) in size-resolved aerosols were investigated at four sites (three cities and one country) in the Beijing-Tianjin-Hebei region from September 2009 to August 2011. The size distributions of OC and EC presented large evolutions among rural and urban sites, and among four seasons, with highest peaks of OC and EC in fine mode in urban areas during winter. Geometric mean diameters (GMDs) of OC and EC in fine particles at urban sites during winter were lower than those at rural site mainly due to effects of fine particle coagulation and organic compound repartitioning. Fossil fuel emissions were a dominant source of OC and EC in urban areas, while biomass burning was a major source of OC and EC at rural site. Trajectory clustering and CWT analysis showed that regional transport was an important contributor to OC and EC in Beijing.
2009 年 9 月至 2011 年 8 月，在北京-天津-河北地区的四个地点（三个城市和一个农村地区），对大气气溶胶中有机碳（OC）和元素碳（EC）的质量浓度进行了按粒径分布的研究。OC 和 EC 的粒径分布在城乡地区之间以及四季之间有很大的变化，冬季城市地区细颗粒中 OC 和 EC 的峰值最高。冬季城市地区细颗粒中 OC 和 EC 的几何平均直径（GMD）低于农村地区，主要是由于细颗粒凝聚和有机化合物再分配的影响。化石燃料的排放是城市地区 OC 和 EC 的主要来源，而生物质燃烧是农村地区 OC 和 EC 的主要来源。轨迹聚类和 CWT 分析表明，区域传输是北京 OC 和 EC 的一个重要贡献者。
