气候变化领域集成服务门户(CCPortal): Chemical characteristics of cloud water and the impacts on aerosol properties at a subtropical mountain site in Hong Kong SAR

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DOI	10.5194/acp-20-391-2020
	Chemical characteristics of cloud water and the impacts on aerosol properties at a subtropical mountain site in Hong Kong SAR
	Li T.; Wang Z.; Wang Y.; Wu C.; Liang Y.; Xia M.; Yu C.; Yun H.; Wang W.; Wang Y.; Guo J.; Herrmann H.; Wang T.
发表日期	2020
ISSN	1680-7316
起始页码	391
结束页码	407
卷号	20 期号:1
英文摘要	To investigate the cloud water chemistry and the effects of cloud processing on aerosol properties, comprehensive field observations of cloud water, aerosols, and gasphase species were conducted at a mountaintop site in Hong Kong SAR in October and November 2016. The chemical composition of cloud water including water-soluble ions, dissolved organic matter (DOM), carbonyl compounds (refer to aldehydes and acetone), carboxylic acids, and trace metals was quantified. The measured cloud water was very acidic with a mean pH of 3.63, as the ammonium (174 μeq L-1) was insufficient for neutralizing the dominant sulfate (231 μeq L-1) and nitrate (160 μeq L-1). Substantial DOM (9.3 mgC L-1) was found in cloud water, with carbonyl compounds and carboxylic acids accounting for 18% and 6% in carbon molar concentrations, respectively. Different from previous observations, concentrations of methylglyoxal (19.1 μM; μM is equal to μmol L-1) and glyoxal (6.72 μM) were higher than that of formaldehyde (1.59 μM). The partitioning of carbonyls between cloud water and the gas phase was also investigated. The measured aqueous fractions of dicarbonyls were comparable to the theoretical estimations, while significant aqueous-phase supersaturation was found for less soluble monocarbonyls. Both organics and sulfate were significantly produced in cloud water, and the aqueous formation of organics was more enhanced by photochemistry and under less acidic conditions. Moreover, elevated sulfate and organics were measured in the cloudprocessed aerosols, and they were expected to contribute largely to the increase in droplet-mode aerosol mass fraction. This study demonstrates the significant role of clouds in altering the chemical compositions and physical properties of aerosols via scavenging and aqueous chemical processing, providing valuable information about gas-cloud-aerosol interactions in subtropical and coastal regions. © 2020 Author(s). This work is distributed under the Creative Commons Attribution 4.0 License.
语种	英语
scopus关键词	aerosol property; chemical composition; cloud water; dissolved inorganic matter; gas phase reaction; mountain environment; photochemistry; subtropical region; synthetic aperture radar; water chemistry; China; Hong Kong
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/141617
作者单位	School of Environmental Science and Engineering, Shandong University, Qingdao, 266237, China; Department of Civil and Environmental Engineering, Hong Kong Polytechnic University, Hong Kong SAR, Hong Kong; Division of Environment and Sustainability, Hong Kong University of Science and Technology, Hong Kong SAR, Hong Kong; Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences, Beijing, 100085, China; Atmospheric Chemistry Department (ACD), Leibniz Institute for Tropospheric Research (TROPOS), Permoserstraße 15, Leipzig, 04318, Germany
推荐引用方式 GB/T 7714	Li T.,Wang Z.,Wang Y.,et al. Chemical characteristics of cloud water and the impacts on aerosol properties at a subtropical mountain site in Hong Kong SAR[J],2020,20(1).
APA	Li T..,Wang Z..,Wang Y..,Wu C..,Liang Y..,...&Wang T..(2020).Chemical characteristics of cloud water and the impacts on aerosol properties at a subtropical mountain site in Hong Kong SAR.Atmospheric Chemistry and Physics,20(1).
MLA	Li T.,et al."Chemical characteristics of cloud water and the impacts on aerosol properties at a subtropical mountain site in Hong Kong SAR".Atmospheric Chemistry and Physics 20.1(2020).