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| Formation Mechanism and Boundary Layer Meteorology Characteristic of a Serious Pollution in Shijiazhuang |
| Received:January 15, 2019 Revised:June 25, 2019 |
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| DOI：10.7643/ issn.1672-9242.2019.06.014 |
| KeyWord:heavy pollution microwave radiometer stratification of temperature stratification of humidity radar wind profiler |
| Author | Institution |
| HAN Jun-cai |
Shijiazhuang Meteorological Bureau, Shijiazhuang, , China |
| CHEN Jing |
Shijiazhuang Meteorological Bureau, Shijiazhuang, , China |
| SHI Wen-ya |
Shijiazhuang Meteorological Bureau, Shijiazhuang, , China |
| ZHANG Li-xia |
Shijiazhuang Meteorological Bureau, Shijiazhuang, , China |
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| Abstract: |
| The temperature and humidity and wind change of the atmospheric boundary layer and its impact on PM2.5 for the severe pollution event during December 5-14, 2015 were studied with daily observation data from ground-based microwave ra-diometer, radar wind profiler, meteorological station and air pollution observation station, respectively. In this paper, the pollution forming source was analyzed with the Hysplit model. The results showed that local pollutant emission was the main pollution forming source during the severe pollution. The cold air was weak, the mean wind speed was less than 1.5m/s and relative hu-midity was more than 70% during the sustained fog-haze event. The weather background of weak breeze, abundant humidity and stable atmosphere circulation was favorable for the formation of serious pollution. The beginning and increasing in inversion layer thickness caused the pollution formation. The average height of inversion layer was about 700m. And the severe and long-lasting fog-haze event was attributed to the thick, strong and long-lasting inversion layer. The small wind layer thickness near ground was high (average 700m) and the ventilating capacity was weak, resulting in difficult dilution and diffusion of pollutants. In addition, high humidity and humidity layer thickness made it easier for PM2.5 to form and accumulate, and it also contributed to the beginning and increasing severe pollution. |
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