两类污染型下中低空风切变对PM<sub>2.5</sub>浓度影响

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Abstract Based on the ecological environment monitoring data and multi-source meteorological data from 2015 to 2020 in Beijing-Tianjin-Hebei region, this study analyzed the evolution characteristics of 0~3km VWS at different PM_2.5 levels in Beijing. The diurnal variation characteristics of wind speed gradually weakened with the increase of PM_2.5 concentration. When PM_2.5 level 6pollution occured, the diurnal variation of near-surface wind speed basically disappeared or even changed in reverse direction. The VWS below 10m/(s·km) corresponded to the increase of boundary layer wind speed in the daytime which increased to 12~14m/(s·km) after 20:00. This phenomenon became more significant with the increase of PM_2.5, and the VWS near the stratum remains small (<6m/(s·km)) in the daytime could be one of the signs of serious pollution. Based on the rotated empirical orthogonal function (REOF) decomposition method, the VWS was divided into two types which called undisturbed type and compression type. The low pressure intensity of compression type was slightly better than undisturbed type; the PM_2.5 peak and daily value and inversion of undisturbed type were higher than compression type. In addition, the PM_2.5 growth of the undisturbed type and PBLH reverse change and the PM_2.5 growth of compressed type changed in the same direction as Planetary Boundary Layer Height (PBLH).

Key words： vertical wind shear(VWS) PM_2.5 REOF boundary layer

Received: 26 April 2022

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X513

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	Articles by authors
	WU Jin
	LI Chen
	WANG Zhi-li
	MA Zhi-qiang
	LI Zi-ming
	ZHU Xiao-wan
	HAN Ting-ting
	TANG Yi-xi
	MA Xiao-hui

Cite this article:

WU Jin,LI Chen,WANG Zhi-li等. Effects of vertical wind shear on PM_2.5 concentration under two pollution weather types[J]. CHINA ENVIRONMENTAL SCIENCECE, 2022, 42(11): 5016-5022.

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http://www.zghjkx.com.cn/EN/ OR http://www.zghjkx.com.cn/EN/Y2022/V42/I11/5016

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