气候变化领域集成服务门户(CCPortal): Hygroscopic properties and cloud condensation nuclei activity of atmospheric aerosols under the influences of Asian continental outflow and new particle formation at a coastal site in eastern Asia

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DOI	10.5194/acp-20-5911-2020
	Hygroscopic properties and cloud condensation nuclei activity of atmospheric aerosols under the influences of Asian continental outflow and new particle formation at a coastal site in eastern Asia
	Cho Cheung H.; Chung-Kuang Chou C.; Siu Lan Lee C.; Kuo W.-C.; Chang S.-C.
发表日期	2020
ISSN	1680-7316
起始页码	5911
结束页码	5922
卷号	20 期号:10
英文摘要	The chemical composition of fine particulate matter (PM2:5), the size distribution and number concentration of aerosol particles (NCN), and the number concentration of cloud condensation nuclei (NCCN) were measured at the northern tip of Taiwan during an intensive observation experiment from April 2017 to March 2018. The parameters of aerosol hygroscopicity (i.e., activation ratio, activation diameter and kappa of CCN) were retrieved from the measurements. Significant variations were found in the hygroscopicity of aerosols (kappa - κ - of 0.18-0.56, for water vapor supersaturation - SS - of 0.12 %-0.80 %), which were subject to various pollution sources, including aged air pollutants originating in eastern and northern China and transported by the Asian continental outflows and fresh particles emitted from local sources and distributed by land-sea breeze circulations as well as produced by processes of new particle formation (NPF). Cluster analysis was applied to the back trajectories of air masses to investigate their respective source regions. The results showed that aerosols associated with Asian continental outflows were characterized by lower NCN and NCCN values and by higher kappa values of CCN, whereas higher NCN and NCCN values with lower kappa values of CCN were observed in the aerosols associated with local air masses. Besides, it was revealed that the kappa value of CCN exhibited a decrease during the early stage of an event of new particle formation, which turned to an increasing trend over the later period. The distinct features in the hygroscopicity of aerosols were found to be consistent with the characteristics in the chemical composition of PM2:5. This study has depicted a clear seasonal characteristic of hygroscopicity and CCN activity under the influence of a complex mixture of pollutants from different regional and/or local pollution sources. Nevertheless, the mixing state and chemical composition of the aerosols critically influence the aerosol hygroscopicity, and further investigations are necessary to elucidate the atmospheric processing involved in the CCN activation in coastal areas. © Author(s) 2020.
语种	英语
scopus关键词	aerosol; atmospheric pollution; cloud condensation nucleus; coastal zone; concentration (composition); hygroscopicity; particulate matter; source apportionment; Far East
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/141335
作者单位	School of Atmospheric Sciences and Guangdong Province Key Laboratory for Climate Change and Natural Disaster Studies, Sun Yat-sen University, Guangzhou, 510275, China; Southern Marine Science and Engineering Guangdong Laboratory (Zhuhai), Zhuhai, 519082, China; Research Center for Environmental Changes, Academia Sinica, Taipei, 11529, Taiwan; Department of Civil Engineering, Chu Hai College of Higher Education, Tuen Mun, Hong Kong; Department of Environmental Monitoring and Information Management, Environmental Protection Administration, Taipei, 10042, Taiwan; School of Public Health, National Defense Medical Center, Taipei, 11490, Taiwan
推荐引用方式 GB/T 7714	Cho Cheung H.,Chung-Kuang Chou C.,Siu Lan Lee C.,et al. Hygroscopic properties and cloud condensation nuclei activity of atmospheric aerosols under the influences of Asian continental outflow and new particle formation at a coastal site in eastern Asia[J],2020,20(10).
APA	Cho Cheung H.,Chung-Kuang Chou C.,Siu Lan Lee C.,Kuo W.-C.,&Chang S.-C..(2020).Hygroscopic properties and cloud condensation nuclei activity of atmospheric aerosols under the influences of Asian continental outflow and new particle formation at a coastal site in eastern Asia.Atmospheric Chemistry and Physics,20(10).
MLA	Cho Cheung H.,et al."Hygroscopic properties and cloud condensation nuclei activity of atmospheric aerosols under the influences of Asian continental outflow and new particle formation at a coastal site in eastern Asia".Atmospheric Chemistry and Physics 20.10(2020).