北京2011年10月连续重污染过程气团光化学性质研究

于2011年10月份对北京市大气痕量气体、颗粒物及单颗粒组成进行了观测,分析了观测期间各项污染物的关系、单颗粒物物理化学特征及气团光学性质,并结合后向气流轨迹分析了污染物来源.结果显示,2011年10月份存在3次明显的重污染过程:第1次过程区域性特征明显,气团光化学年龄较长,主要来源于河北省和山西省交界处;第2次过程呈区域与局地性叠加特征,气团光化学年龄开始呈现缩短趋势,气团主要来源于河北省;第3次过程中局地特征较明显,气团光化学年龄较短,主要来源于京津及河北省中北部.

Photo chemical property and source of particles during contunious episodes in October 2011 in Beijing

The gaseous pollutants, particles and single particles were observed in October 2011 in Beijing. Here we analyzed the relationship between primary pollutants, physical and chemical properties of single particles, and photochemical properties of air masses. The origination of the air masses was analyzed combining with back trajectories. The result show that in October there were three obvious pollution episodes: in the first episode, the air masses were found to be regional and photochemical aged, which originated from the border of Hebei and Shandong Province. The air masses during the second episode mainly came from Hebei Province and mixed with local air masses with short photochemical age. During the third one, the air masses characterized as freshly emitted plume, which were supposed to originate from Beijing, Tianjin or areas in Mid-North of Hebei Province.