京津冀区域典型重污染过程与反馈效应研究

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Abstract

Taking the heavy pollution episode in Beijing-Tianjin-Hebei region from October 5th to 12th, 2014 as an example, the aircraft AMDAR data and WRF-Chem model were applied to the evolution analysis of atmospheric boundary layer vertical structure and PM_2.5 temporal and spatial characteristic. The aerosol direct feedback effect on multiple meteorological factors was simulated and quantitatively estimated. The results indicated that the heavy pollution process presented the characteristics including long duration, wide influencing region, large intensity and a tape-shape distribution of PM_2.5 pollution, which was mainly affected by the uniform pressure field of ground, stable atmospheric background formed by latitudinal circulation in upper air, the vertical structure distribution of wind field and inversion structure. Aerosol direct feedback led to the following effect:(1) solar radiation reduced by 39.80W/m²; (2) temperature reduced by 0.34℃; (3) the boundary layer height reduced by 36.64m; (4) relative humidity increased by 0.90%. The feedback effect in the southern region was more obvious than that in the north region. The feedback effect in the pollution days was stronger than the average periods and clean days. The feedback effect makes the meteorological elements appear to be unfavorable to the diffusion of pollutants, and results in the further increase of PM_2.5 concentration.

Key words： heavy pollution atmospheric boundary layer aerosol direct feedback WRF-Chem

Received: 02 September 2017

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	Articles by authors
	ZHANG Han-yu
	WEN Wei
	CHENG Shui-yuan
	LV Zhe

Cite this article:

ZHANG Han-yu,WEN Wei,CHENG Shui-yuan等. Study on typical heavy pollution process and feedback effect in Beijing-Tianjin-Hebei region[J]. CHINA ENVIRONMENTAL SCIENCECE, 2018, 38(4): 1209-1220.

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http://www.zghjkx.com.cn/EN/ OR http://www.zghjkx.com.cn/EN/Y2018/V38/I4/1209

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