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Influence of Coastal Planetary Boundary Layer on Pm2.5 with Unmanned Aerial Vehicle Observation

SSRN, ISSN: 1556-5068
2023
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Metric Options:   Counts1 Year3 Year

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    105

Article Description

Field measurement with Unmanned Aerial Vehicle (UAV) platform was conducted at coastal area of Bohai in winter of 2018 and summer of 2019. Characteristics of boundary layer structure and its influence on PM2.5 were studied. 76 flights in winter and 59 flights in summer were observed. Results showed that meteorological factors and PM2.5 changed significantly below 300 m. PM2.5 peak occurred at 300 m, 100 m and 200 m during summer morning, daytime and night period, respectively. During winter pollution episode, the maximum wind speed was observed at 200 m,special stratification between 50~100 m was observed at 11:00, where wind speed decreased and high PM2.5 concentration maintained. Southwest and southeast wind, northwest and northeast wind formed obvious convergence at coastal area in turn, resulting in high PM2.5 concentration of 140~160 μg m-3 and 218 μg m-3 at surface respectively. In summer, the sea breeze formed at 13:00 and extended to inland about 50 km, generating PM2.5 concentration at coastal area was ~20 μg m-3 higher than inland area. Thermal internal boundary layer formed at 15:00, weak temperature inversion layer was observed between 50 m~100 m, the maximum wind speed was 8 m s-1, the wind direction changed from southeast to south, and maximum PM2.5 concentrations of 160 μg m-3 were observed at 100 m, then the special stratification developed upward to 150 m at 17:00.

Bibliographic Details

Suqin Han; Yingxiao Tang; Miaomiao Lu; Xu Yang; Ziying Cai; Jing Ding; Jing Shi

Elsevier BV

Multidisciplinary; Vertical profile; Thermal internal boundary layer; Meteorological factor; PM2.5; Unmanned aerial vehicle; Coastal area.

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