期刊
ATMOSPHERIC ENVIRONMENT
卷 98, 期 -, 页码 146-157出版社
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.atmosenv.2014.08.053
关键词
Haze episode; PM2.5; Atmospheric circulation; Meteorological causes; Planetary boundary layer; Pollutant transport
资金
- National Basic Research Program (973) [2014CB441201]
- National Natural Scientific Foundation of China [41275007]
- National Natural Science Foundation of China [41130104, 41075079]
- CAMS [2013Z007]
This paper employs meteorological observation data from surface and high-balloon stations, China Meteorological Administration (CMA) model T639 output data, NCEP reanalysis data, PM2.5 observations and modeled HYSPLIT4 trajectory results to study the meteorological causes, including large-scale circulation and planetary boundary layer features, which led to the extended haze episode on January 6-16, 2013 in central-eastern China. It discusses the possible impact of pollutants transported from southern Hebei Province on Beijing. The study's results show that: (1) the re-adjustment of atmospheric circulation from a longitudinal to a latitudinal model provides a valuable interpretation of the large-scale circulation background to the haze episode experienced in the metropolitan regions of Beijing, Tianjin, Hebei and their surrounding regions; (2) the regional atmospheric stratification of the planetary boundary layer is stable and the mixing height is low, suppressing air turbulence in the planetary boundary layer and providing favorable meteorological conditions for the formation of haze; and (3) the southwesterly jet stream with wind speeds of 6-11 m/s at a height of 850-950 hPa and the below-700 m air mass trajectory tracking established using the HYSPLIT4 model interdependently suggest a transport of pollutants from southern Hebei Province to Beijing at 850-950 hPa. (C) 2014 Elsevier Ltd. All rights reserved.
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