气候变化领域集成服务门户(CCPortal): Weakened Aerosol-PBL Interaction During COVID-19 Lockdown in Northern China

CCPortal

DOI	10.1029/2020GL090542
	Weakened Aerosol-PBL Interaction During COVID-19 Lockdown in Northern China
	Wang Z.; Huang X.; Ding K.; Ren C.; Cao L.; Zhou D.; Gao J.; Ding A.
发表日期	2021
ISSN	0094-8276
卷号	48 期号:3
英文摘要	Anthropogenic emissions were greatly constrained during COVID-19 lockdown in China. Nevertheless, observations still showed high loadings of fine particles (PM2.5) over northern China with secondary aerosols increasing by 15 μg/m3 yet a ∼10% drop in light-absorbing black carbon (BC). Such a chemical transition in aerosol composition tended to make the atmosphere more scattering, indicated by satellite-retrieved aerosol absorption optical depth falling by 60%. Comparison between weather forecast and radiosonde observations illustrated that, without upper-level heating induced by BC, the stabilized stratification diminished, which was conducive for planetary boundary layer (PBL) mixing and thus near-surface pollution dispersion. Furthermore, coupled dynamic-chemistry simulations estimated that emission reduction during the lockdown weakened aerosol-PBL interaction and thus a reduction of 25 μg/m3 (∼50%) in PM2.5 enhancement. Based on the unique natural experiment, this work observationally confirmed and numerically quantified the importance of BC-induced meteorological feedback, further highlighting the priority of BC control in haze mitigation. © 2020. American Geophysical Union. All Rights Reserved.
英文关键词	Aerosols; Boundary layers; Emission control; Particulate emissions; Radiosondes; Aerosol absorption; Aerosol composition; Anthropogenic emissions; Chemical transition; Emission reduction; Planetary boundary layers; Radiosonde observations; Secondary aerosols; Weather forecasting
语种	英语
来源期刊	Geophysical Research Letters
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/169149
作者单位	School of Atmospheric Sciences, Nanjing University, Nanjing, China; Collaborative Innovation Center of Climate Change, Nanjing, Jiangsu Province, China; Meteorological Observatory of Jiangsu Province, Nanjing, China; Chinese Research Academy of Environmental Science, Beijing, China
推荐引用方式 GB/T 7714	Wang Z.,Huang X.,Ding K.,et al. Weakened Aerosol-PBL Interaction During COVID-19 Lockdown in Northern China[J],2021,48(3).
APA	Wang Z..,Huang X..,Ding K..,Ren C..,Cao L..,...&Ding A..(2021).Weakened Aerosol-PBL Interaction During COVID-19 Lockdown in Northern China.Geophysical Research Letters,48(3).
MLA	Wang Z.,et al."Weakened Aerosol-PBL Interaction During COVID-19 Lockdown in Northern China".Geophysical Research Letters 48.3(2021).