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| UAV-based Vertical Profiles of Black Carbon |
| Received:March 16, 2019 Revised:June 25, 2019 |
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| DOI：10.7643/ issn.1672-9242.2019.06.008 |
| KeyWord:black carbon unmanned aerial vehicle vertical profile |
| Author | Institution |
| WANG Han-yu |
1. Center for ITS and UAV Applications Research, Shanghai Jiao Tong University, Shanghai , China |
| PENG Zhong-ren |
1. Center for ITS and UAV Applications Research, Shanghai Jiao Tong University, Shanghai , China; 2. Department of Urban and Regional Planning, University of Florida, Gainesville 32611, USA |
| WANG Dong-sheng |
1. Center for ITS and UAV Applications Research, Shanghai Jiao Tong University, Shanghai , China |
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| Abstract: |
| Objective To study vertical profiles and conveying sources of black carbon in the troposphere. Methods Vertical measurements with unmanned aerial vehicle (UAV) carrying portable sensors were conducted to collect altitude profiles on concentration of BC within 1000 meters in the summer of 2014 and the winter of 2015 in Lin’an, China. In order to reduce sta-tistical error, two days’ BC data including eight field experiments was averaged according to altitude. Results The ground test results indicated that the mass concentration of BC in the winter morning was 3 times of that in the summer morning; while the mass concentration of BC in the winter afternoon was less than that in the summer afternoon. The UAV test results showed, during the day, the concentration of BC increased over time during summer and decreased over time during winter. During the morning in both summer and winter, the mass concentration of BC decreased with the increase of height. Moreover, the mass concentration of BC in the winter morning was much larger than that in the summer morning. But the mass concentration of BC in summer afternoon and winter afternoon was similar. The results of 48 h HYSPLIT archive trajectories exhibited that air mass of the summer at 300 m and 1000 m was derived from Shanghai and the conveying distance was within 200 km. That is, all transport paths were in the Yangtze river delta region. However, air mass of the winter at 300 m and 1000 m was dated from northern areas and the conveying distance was beyond 1000 km. Conclusion The case study indicates heavy concentration of BC tends to form in the winter morning. The main source of pollutants in summer is the short distance transport; while the main source of pollutants in winter is the remote transport. |
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