中文关键词SPAMS细颗粒物后向轨迹模拟聚类分析夏季天津 英文关键词SPAMSfine particulate matterback trajectories simulationcluster analysisTianjin summer

作者	单位	E-mail
温杰	南开大学环境科学与工程学院, 国家环境保护城市空气颗粒物污染防治重点实验室, 天津 300071	wj9312@hotmail.com
史旭荣	南开大学环境科学与工程学院, 国家环境保护城市空气颗粒物污染防治重点实验室, 天津 300071
田瑛泽	南开大学环境科学与工程学院, 国家环境保护城市空气颗粒物污染防治重点实验室, 天津 300071	tianyingze@hotmail.com
徐娇	南开大学环境科学与工程学院, 国家环境保护城市空气颗粒物污染防治重点实验室, 天津 300071
史国良	南开大学环境科学与工程学院, 国家环境保护城市空气颗粒物污染防治重点实验室, 天津 300071
冯银厂	南开大学环境科学与工程学院, 国家环境保护城市空气颗粒物污染防治重点实验室, 天津 300071

中文摘要 天津市作为京津冀大气污染传输通道及环渤海经济带的重要城市，其环境空气中细颗粒物的化学组成特征及来源具有重大研究价值.本研究于2017年8月利用单颗粒气溶胶质谱仪（SPAMS）采集了天津市津南区环境受体中细颗粒物的整月数据，旨在描述天津市夏季环境空气中细颗粒物的组分特征，定性判断主要污染源类.通过ART-2a聚类、合并后获得EC类颗粒，Fe-NO₃颗粒，Na-K颗粒和金属类颗粒等12种颗粒类型，并对各类型颗粒在粒径分布和日变化上的特征进行了研究.EC颗粒随粒径增长数浓度占比降低，扬尘类颗粒和Fe-NO₃颗粒相反；日变化结果显示光化学反应能够影响3类EC颗粒的日变化趋势，而Fe-NO₃颗粒日间占比提升与白天工业生产活动排放有关.对观测时段内主要来向气团上颗粒物组成进行研究，监测点位夏季主要受西北和西南方向气团来向影响，当点位主要受西南方向上气团影响时，燃煤源的颗粒影响较大，而东南方向气团发生频率较高时，生物质燃烧源颗粒与海盐源颗粒贡献相对较高. 英文摘要 As an important megacity of the Beijing-Tianjin-Hebei air pollution transmission channel and the Bohai Sea Economic Zone, Tianjin is influenced by air pollution in recent years, thus research on the fine particulate matter in Tianjin is of vital value. In this study, single particle aerosol mass spectrometry (SPAMS) was used to measure data of Jinnan District in Tianjin during August 2017, to describe the chemical features of fine particles in summer ambient air and estimate the potential pollution sources of fine particles. By using the ART-2a clustering method, 12 classes of PM were acquired, such as elemental carbon particles, Fe-NO₃ particles, Na-K particles, and metal particles. After monitoring the size distribution and diurnal variation of fine particles, it was concluded that the ratio of EC particles decreased as the size increased, whereas dust particles and Fe-NO₃ particles showed the opposite trend; three types of EC particles varied differently in a day according to the photochemical reaction; and the ratio of Fe-NO₃ particles was elevated in the daytime because of industrial production during that period. Backward trajectories of daily airflow at the measured spot were also calculated. When the monitoring site was affected by the air mass from the southwest, coal-burning particles may have contributed more; whereas, when the air mass from the southeast occurred more frequently, biomass burning and sea salt particles possibly contributed more.

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