气候变化领域集成服务门户(CCPortal): A Large Impact of Cooking Organic Aerosol (COA) on Particle Hygroscopicity and CCN Activity in Urban Atmosphere

CCPortal

DOI	10.1029/2020JD033628
	A Large Impact of Cooking Organic Aerosol (COA) on Particle Hygroscopicity and CCN Activity in Urban Atmosphere
	Liu J.; Zhang F.; Xu W.; Chen L.; Ren J.; Jiang S.; Sun Y.; Li Z.
发表日期	2021
ISSN	2169897X
卷号	126 期号:8
英文摘要	Cooking organic aerosol (COA) constitutes a considerable proportion of fine particles in populated area, while there is a lack of understanding on its impact on climate. Using a data set from field observations in Beijing, we characterize the variations of COA in fine particulate matter (PM) and its effect on aerosols hygroscopicity and cloud condensation nuclei (CCN) activity. The observed mass concentrations of COA from two campaigns of winter 2016 and summer 2017 were 5.5 ± 5.6 µg m−3 and 1.9 ± 2.1 µg m−3, respectively, corresponding to mass fraction of COA to PM1 and total OA of 8% ± 9% and 17% ± 13% in winter, 10% ± 9% and 19% ± 13% in summer. The strong COA sources are evidenced by apparent peak values in mass concentrations at lunch and dinner times. With increase of volume fraction of COA from ∼10% during noncooking time to ∼40% during dinner time, hygroscopic parameter of OA (κorg) is decreased from ∼0.21 to ∼0.06 (corresponding to a decrease of overall hygroscopic parameter of aerosols, κ, from ∼0.25 to ∼0.20), showing a critical role of COA in altering aerosols hygroscopicity. Further evaluation shows that the decrease in aerosols hygroscopicity caused by COA will reduce its CCN activity significantly (characterized by critical supersaturation, Sc, increasing from ∼0.25%–0.5% to ∼0.4%–0.7%). The current circumstance, which presents no apparent downward trends of COA in Beijing during last decades but much greater levels of COA in China than those in other regions around the world, suggests the great significance to account for the effect of COA on regional climate in models. © 2021. American Geophysical Union. All Rights Reserved.
语种	英语
来源期刊	Journal of Geophysical Research: Atmospheres
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/185279
作者单位	College of Global Change and Earth System Science, Beijing Normal University, Beijing, China; State Key Laboratory of Atmospheric Boundary Layer Physics and Atmospheric Chemistry, Institute of Atmospheric Physics, Chinese Academy of Sciences, Beijing, China; Earth System Science Interdisciplinary Center and Department of Atmospheric and Oceanic Science, University of Maryland, College ParkMD, United States
推荐引用方式 GB/T 7714	Liu J.,Zhang F.,Xu W.,et al. A Large Impact of Cooking Organic Aerosol (COA) on Particle Hygroscopicity and CCN Activity in Urban Atmosphere[J],2021,126(8).
APA	Liu J..,Zhang F..,Xu W..,Chen L..,Ren J..,...&Li Z..(2021).A Large Impact of Cooking Organic Aerosol (COA) on Particle Hygroscopicity and CCN Activity in Urban Atmosphere.Journal of Geophysical Research: Atmospheres,126(8).
MLA	Liu J.,et al."A Large Impact of Cooking Organic Aerosol (COA) on Particle Hygroscopicity and CCN Activity in Urban Atmosphere".Journal of Geophysical Research: Atmospheres 126.8(2021).