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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摘要利用WRF-CMAQ模型及来源解析模块ISAM对2021年11月1~20日四川盆地一次区域PM_2.5重污染过程进行了数值模拟，结合地面气象观测数据和污染物监测数据分析了污染成因机制并进一步开展了PM_2.5来源解析研究.结果表明，WRF-CMAQ模型能较好地重现气象要素及各城市污染物浓度的变化.此次冬季PM_2.5污染过程因受本地排放源及小风、高湿等不利气象条件的影响，导致PM_2.5在成都平原累积，在短时间内达到峰值而形成，并且多个城市日均PM_2.5浓度峰值超过150μg/m³.ISAM源解析结果表明，本地源是四川盆地各城市PM_2.5污染的主导来源，其中成都、重庆、达州及广元的本地排放对PM_2.5浓度的贡献率均超过50%，而周边城市的区域输送也有重要贡献.

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关键词 ：四川盆地, PM_2.5, WRF-CMAQ, 来源解析

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

收稿日期: 2023-04-06

PACS:

X513

基金资助:国家自然科学基金资助项目（42175174）；四川省自然科学基金资助项目（2022NSFSC1092）；成都信息工程大学科技创新能力提升计划项目（KYQN202239）；成都信息工程大学大学生创新创业训练计划项目（202310621001）

通讯作者: 杨显玉,副教授,xyang@cuit.edu.cn E-mail: xyang@cuit.edu.cn

作者简介: 杨童(1999-),女,成都信息工程大学硕士研究生在读,主要从事大气物理与大气环境研究.发表论文1篇.3210101002@stu.cuit.edu.cn.

引用本文:

杨童, 杨显玉, 阮温馨, 吕雅琼, 胡芩, 曹帮军, 贲秉政, 吴锴. 2021年冬季四川盆地区域PM_2.5重污染事件成因及来源解析[J]. 中国环境科学, 2023, 43(11): 5633-5644. YANG Tong, YANG Xian-yu, RUAN Wen-xin, Lü Ya-qiong, HU Qin, CAO Bang-jun, BEN Bing-zheng, WU Kai. Attribution and source apportionment of a severe PM_2.5 episode in winter 2021 over the Sichuan Basin. CHINA ENVIRONMENTAL SCIENCECE, 2023, 43(11): 5633-5644.

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http://www.zghjkx.com.cn/CN/ 或 http://www.zghjkx.com.cn/CN/Y2023/V43/I11/5633

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