2021年冬季四川盆地区域PM<sub>2.5</sub>重污染事件成因及来源解析

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Abstract In this study, the Weather Research and Forecasting (WRF)-Community Multiscale Air Quality (CMAQ) model with ISAM module was adopted to simulate a highly polluted PM_2.5 episode across the Sichuan Basin between November 11and November 20 in 2021. In combination with ground-level meteorological observations and air quality monitoring data, the formation mechanism of this episode and sources of PM_2.5 were elucidated. The results show that the variations of meteorological parameters and air pollutants concentrations were well captured by the WRF-CMAQ model. This PM_2.5 episode was mainly affected by local emissions and unfavorable meteorological conditions featured by low wind speeds and high relative humidity, resulting in the accumulation of PM_2.5 in the Chengdu Plain, which progressively reached its peak in a short period. The peak daily average PM_2.5 concentration in multiple cities exceeded 150μg/m³. Further analysis performed by ISAM indicates that local anthropogenic emissions were the dominant source of PM_2.5 in cities within the Sichuan Basin, with a contribution higher than 50% depicted in Chengdu, Chongqing, Dazhou, and Guangyuan cities. Regional transport from nearby regions also played an important role in elevating PM_2.5 levels.

Key words： Sichuan Basin PM_2.5 WRF-CMAQ source apportionment

Received: 06 April 2023

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X513

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	Articles by authors
	YANG Tong
	YANG Xian-yu
	RUAN Wen-xin
	Lü Ya-qiong
	HU Qin
	CAO Bang-jun
	BEN Bing-zheng
	WU Kai

Cite this article:

YANG Tong,YANG Xian-yu,RUAN Wen-xin等. Attribution and source apportionment of a severe PM_2.5 episode in winter 2021 over the Sichuan Basin[J]. CHINA ENVIRONMENTAL SCIENCECE, 2023, 43(11): 5633-5644.

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http://www.zghjkx.com.cn/EN/ OR http://www.zghjkx.com.cn/EN/Y2023/V43/I11/5633

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