期刊
ENVIRONMENTAL SCIENCE & TECHNOLOGY LETTERS
卷 10, 期 9, 页码 779-785出版社
AMER CHEMICAL SOC
DOI: 10.1021/acs.estlett.3c00490
关键词
PM2.5; improved process analysis; opposite change; WRF-Chem; North China Plain
Using an improved process-level quantification method, researchers conducted a quantitative analysis on the contribution of each physical/chemical process to PM2.5 changes before and during the COVID-19 lockdown. They identified a dominant process responsible for the inverse PM2.5 changes over the southern and northern North China Plain.
By using an improved process-level quantification method implemented in the WRF-Chem model, we provide a quantitative analysis on contribution of each physical/chemical process to PM2.5 change from before to during the COVID-19 lockdown and further identify a dominant process responsible for inverse PM2.5 changes over the southern and northern North China Plain (NCP). From before to during the lockdown period, the PM2.5 concentration over the southern NCP decreased by 61.0 mu g m(-3); a weakened aerosol chemistry production process mainly resulting from emission mitigation of precursors was identified to be the leading process for the PM2.5 decrease. However, the northern NCP suffered from an unexpected PM2.5 increase of 10.0 mu g m(-3), which was primarily attributed to a weakened advection dilution process induced by decreased wind speed. The improved process analysis method, superior to the traditional one, can be applied to any two periods rather than two instantaneous time points, and therefore it exerts a new contribution to understand the pollution evolution mechanism from a process-level quantitative perspective.
作者
我是这篇论文的作者
点击您的名字以认领此论文并将其添加到您的个人资料中。
推荐
暂无数据