气候变化领域集成服务门户(CCPortal): Measurement report: Distinct size dependence and diurnal variation in organic aerosol hygroscopicity, volatility, and cloud condensation nuclei activity at a rural site in the Pearl River Delta (PRD) region, China

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DOI	10.5194/acp-22-8117-2022
	Measurement report: Distinct size dependence and diurnal variation in organic aerosol hygroscopicity, volatility, and cloud condensation nuclei activity at a rural site in the Pearl River Delta (PRD) region, China
	Cai, Mingfu; Huang, Shan; Liang, Baoling; Sun, Qibin; Liu, Li; Yuan, Bin; Shao, Min; Hu, Weiwei; Chen, Wei; Song, Qicong; Li, Wei; Peng, Yuwen; Wang, Zelong; Chen, Duohong; Tan, Haobo; Xu, Hanbin; Li, Fei; Deng, Xuejiao; Deng, Tao; Sun, Jiaren; Zhao, Jun
发表日期	2022
ISSN	1680-7316
EISSN	1680-7324
起始页码	8117
结束页码	8136
卷号	22 期号:12 页码:20
英文摘要	Organic aerosol (OA) has a significant contribution to cloud formation and hence climate change. However, high uncertainties still exist in its impact on global climate, owing to the varying physical properties affected by the complex formation and aging processes. In this study, the hygroscopicity, volatility, cloud condensation nuclei (CCN) activity, and chemical composition of particles were measured using a series of online instruments at a rural site in the Pearl River Delta (PRD) region of China in fall 2019. During the campaign, the average hygroscopicity of OA (icoA) increased from 0.058 at 30 nm to 0.09 at 200 nm, suggesting a higher oxidation state of OA at larger particle sizes, supported by a higher fraction of extremely low volatility OA (ELVOA) for larger size particles. Significantly different diurnal patterns of kappa(OA) were observed between Aitken mode particles and accumulation mode particles. For Aitken mode particles (30-100 nm), the kappa(OA) values showed daily minima (0.02-0.07) during daytime, while the accumulation mode exhibited a daytime peak (similar to 0.09). Coincidently, a daytime peak was observed for both aged biomass burning organic aerosol (aBBOA) and less oxygenated organic aerosol (LOOA) based on source apportionment, which was attributed to the aging processes and gas-particle partitioning through photochemical reactions. In addition, the fraction of semi-volatile OA (S VOA) was higher at all measured sizes during daytime than during nighttime. These results indicate that the formation of secondary OA (SOA) through gas-particle partitioning can generally occur at all diameters, while the aging processes of pre-existing particles are more dominated in the accumulation mode. Furthermore, we found that applying a fixed kappa(OA) value (0.1) could lead to an overestimation of the CCN number concentration (N-CCN) up to 12 %-19 % at 0.1 %-0.7 % supersaturation (SS), which was more obvious at higher SS during daytime. Better prediction of N-CCN could be achieved by using size-resolved diurnal kappa(OA), which indicates that the size dependence and diurnal variations in kappa(OA) can strongly affect the N-CCN at different SS values. Our results highlight the need for accurately evaluating the atmospheric evolution of OA at different size ranges and their impact on the physicochemical properties and hence climate effects.
学科领域	Environmental Sciences; Meteorology & Atmospheric Sciences
语种	英语
WOS研究方向	Environmental Sciences & Ecology ; Meteorology & Atmospheric Sciences
WOS记录号	WOS:000814213700001
来源期刊	ATMOSPHERIC CHEMISTRY AND PHYSICS
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/273681
作者单位	Jinan University; Sun Yat Sen University; Sun Yat Sen University; China Meteorological Administration; Chinese Academy of Sciences; Guangzhou Institute of Geochemistry, CAS; Chinese Academy of Sciences; Guangzhou Institute of Geochemistry, CAS; Southern Marine Science & Engineering Guangdong Laboratory; Southern Marine Science & Engineering Guangdong Laboratory (Zhuhai)
推荐引用方式 GB/T 7714	Cai, Mingfu,Huang, Shan,Liang, Baoling,et al. Measurement report: Distinct size dependence and diurnal variation in organic aerosol hygroscopicity, volatility, and cloud condensation nuclei activity at a rural site in the Pearl River Delta (PRD) region, China[J],2022,22(12):20.
APA	Cai, Mingfu.,Huang, Shan.,Liang, Baoling.,Sun, Qibin.,Liu, Li.,...&Zhao, Jun.(2022).Measurement report: Distinct size dependence and diurnal variation in organic aerosol hygroscopicity, volatility, and cloud condensation nuclei activity at a rural site in the Pearl River Delta (PRD) region, China.ATMOSPHERIC CHEMISTRY AND PHYSICS,22(12),20.
MLA	Cai, Mingfu,et al."Measurement report: Distinct size dependence and diurnal variation in organic aerosol hygroscopicity, volatility, and cloud condensation nuclei activity at a rural site in the Pearl River Delta (PRD) region, China".ATMOSPHERIC CHEMISTRY AND PHYSICS 22.12(2022):20.