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| Effects of Atmospheric Temperature and Humidity Profiles on Vertical Distribution of Aerosols in Beijing |
| Received:January 07, 2019 Revised:June 25, 2019 |
| View Full Text View/Add Comment Download reader |
| DOI：10.7643/ issn.1672-9242.2019.06.009 |
| KeyWord:aerosol extinction coefficient temperature and humidity profiles PM2.5 pollution conditions |
| Author | Institution |
| WANG Wei-qi |
1. Unit 66199 of PLA, Beijing , China |
| WANG Zhang-jun |
2. Institute of Oceanographic Instrumentation, Qilu University of Technology Shandong Academy of Sciences, Qingdao , China |
| ZANG Zeng-liang |
3. Institute of Meteorology and Oceanography, National University of Defense Technology, Nanjing , China |
| HU Jun-zhong |
1. Unit 66199 of PLA, Beijing , China |
| ZHANG Cheng-jie |
1. Unit 66199 of PLA, Beijing , China |
| ZHUANG Quan-feng |
2. Institute of Oceanographic Instrumentation, Qilu University of Technology Shandong Academy of Sciences, Qingdao , China |
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| Abstract: |
| Objective To analyze effects of atmospheric temperature and humidity profiles on the vertical distribution of aerosols in Beijing. Methods The relationship between atmospheric temperature and humidity profiles and aerosol extinction coefficient profiles under different pollution conditions was analyzed with meteorological sounding, ground PM2.5 concentration and aerosol lidar extinction coefficient data twice (08:00 and 20:00) a day from September 2017 to August 2018 in Beijing. Results The correlation coefficients of ground PM2.5 concentration and aerosol extinction coefficient at 210 m was 0.77. The extinction coefficient of near ground in spring, autumn and winter was about 5 times of that under clean conditions; and that under summer pollution was about 3 times of that under clean conditions. Compared with the clean conditions, the vertical decline rate of atmospheric temperature in each season under the pollution conditions was smaller; and the relative humidity in the lower atmosphere was larger. Conclusion The atmospheric temperature profile represents the stability of atmospheric stratification and affects the height of aerosol diffusion. The relative humidity profile is closely related to the aerosol hygroscopicity growth. Both have important effects on the vertical distribution of aerosol extinction coefficient. |
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