Chemical characteristics of cloud water and the impacts on aerosol properties at a subtropical mountain site in Hong Kong SAR
文献类型：期刊论文
| 作者 | Li, Tao ; Wang, Zhe; Wang, Yaru; Wu, Chen; Liang, Yiheng; Xia, Men; Yu, Chuan; Yun, Hui; Wang, Weihao; Wang, Yan
|
| 刊名 | ATMOSPHERIC CHEMISTRY AND PHYSICS
 |
| 出版日期 | 2020-01-13 |
| 卷号 | 20期号:1页码:391-407 |
| ISSN号 | 1680-7316 |
| 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 gas-phase 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 mu eq L-1) was insufficient for neutralizing the dominant sulfate (231 mu eq L-1) and nitrate (160 mu eq 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 mu M; mu M is equal to mu mol L-1) and glyoxal (6.72 mu M) were higher than that of formaldehyde (1.59 mu M). 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 cloud-processed 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. |
| 源URL | [http://ir.rcees.ac.cn/handle/311016/44241]  |
| 专题 | 生态环境研究中心_城市与区域生态国家重点实验室 |
| 推荐引用方式 GB/T 7714 | Li, Tao,Wang, Zhe,Wang, Yaru,et al. Chemical characteristics of cloud water and the impacts on aerosol properties at a subtropical mountain site in Hong Kong SAR[J]. ATMOSPHERIC CHEMISTRY AND PHYSICS,2020,20(1):391-407. |
| APA | Li, Tao.,Wang, Zhe.,Wang, Yaru.,Wu, Chen.,Liang, Yiheng.,...&Wang, Tao.(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),391-407. |
| MLA | Li, Tao,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):391-407. |
入库方式： OAI收割
来源：生态环境研究中心
浏览0
下载0
收藏0
其他版本
除非特别说明，本系统中所有内容都受版权保护，并保留所有权利。