| Title | The evolution of an aerosol event observed from aircraft in Beijing: An insight into regional pollution transport |
| Authors | Tian, Ping Liu, Dantong Huang, Mengyu Liu, Quan Zhao, Delong Ran, Liang Deng, Zhaoze Wu, Yunfei Fu, Shizuo Bi, Kai Gao, Qian He, Hui Xue, Huiwen Ding, Deping |
| Affiliation | Beijing Key Lab Cloud Precipitat & Atmospher Wate, Beijing 100089, Peoples R China China Meteorol Adm, Field Expt Base Cloud & Precipitat Res North Chin, Beijing, Peoples R China Zhejiang Univ, Sch Earth Sci, Dept Atmospher Sci, Hangzhou, Zhejiang, Peoples R China Univ Manchester, Sch Earth & Environm Sci, Ctr Atmospher Sci, Manchester M13 9PL, Lancs, England Chinese Acad Sci, Inst Atmospher Phys, Key Lab Middle Atmosphere & Global Environm Obser, Beijing 100029, Peoples R China Chinese Acad Sci, Inst Atmospher Phys, CAS Key Lab Reg Climate Environm Temperate East A, Beijing 100029, Peoples R China Peking Univ, Dept Atmospher & Ocean Sci, Beijing 100871, Peoples R China Nanjing Univ, Sch Atmospher Sci, Nanjing 210023, Jiangsu, Peoples R China |
| Issue Date | 2019 |
| Publisher | ATMOSPHERIC ENVIRONMENT |
| Abstract | To investigate the transport and formation mechanism of pollution in Beijing, this study explored the vertical profiles of aerosol properties using aircraft measurement during a regional transport (RT) pollution event from 10th to 12th December 2016. The aerosol chemical composition and size distribution were characterized. Different vertical structures exhibited during three periods (defined as before RT, during RT, and after RT) for this pollution event. Before RT, PM2.5 and black carbon (BC) mass loading were at low level in the mixing layer (ML) when the clean northerly air mass dominated. During RT, an elevated aerosol layer, in which BC and PM2.5 mass concentrations were about 1.5 times higher than that at the ground level, was found in the upper ML (at 400-900 m) over Beijing. This elevated aerosol layer was advected by the prevailing southwesterly air mass which transported the pollutants from the intensively polluted southwestern region over Beijing. These aerosols through RT featured with pronounced secondary compositions and large coatings on BC particles. After RT, the pollutants were significantly diluted by the prevailing NW air mass, whereas the aerosol concentration almost maintained in the near surface, leading to notable vertical gradient. The continued surface pollution may result from the low wind speed and secondary aerosol formation in the next day. This study suggests that only the ground observation could not fully explain the pollution event, but the variation of vertical structure of aerosol properties should be considered to elucidate the formation mechanism of pollution over Beijing. |
| URI | http://hdl.handle.net/20.500.11897/548037 |
| ISSN | 1352-2310 |
| DOI | 10.1016/j.atmosenv.2019.02.005 |
| Indexed | SCI(E) EI |
| Appears in Collections: | 物理学院 |
