Global S&T Development Trend Analysis Platform of Resources and Environment
DOI | 10.5194/acp-19-12163-2019 |
Interactions between aerosol organic components and liquid water content during haze episodes in Beijing | |
Li, Xiaoxiao1; Song, Shaojie2; Zhou, Wei1; Hao, Jiming1; Worsnop, Douglas R.3,4; Jiang, Jingkun1 | |
2019-10-01 | |
发表期刊 | ATMOSPHERIC CHEMISTRY AND PHYSICS
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ISSN | 1680-7316 |
EISSN | 1680-7324 |
出版年 | 2019 |
卷号 | 19期号:19页码:12163-12174 |
文章类型 | Article |
语种 | 英语 |
国家 | Peoples R China; USA; Finland |
英文摘要 | Aerosol liquid water (ALW) is ubiquitous in ambient aerosol and plays an important role in the formation of both aerosol organics and inorganics. To investigate the interactions between ALW and aerosol organics during haze formation and evolution, ALW was modelled based on long-term measurement of submicron aerosol composition in different seasons in Beijing. ALW contributed by aerosol inorganics (ALW(inorg)) was modelled by ISORROPIA II, and ALW contributed by organics (ALW(org)) was estimated with kappa-Kohler theory, where the real-time hygroscopicity parameter of the organics (kappa(org)) was calculated from the real-time organic oxygen-to-carbon ratio (O/C). Overall particle hygroscopicity (kappa(total)) was computed by weighting component hygroscopicity parameters based on their volume fractions in the mixture. We found that ALW(org), which is often neglected in traditional ALW modelling, contributes a significant fraction (18 %-32 %) to the total ALW in Beijing. The ALW(org) fraction is largest on the cleanest days when both the organic fraction and kappa(org) are relatively high. The large variation in O/C, from 0.2 to 1.3, indicates the wide variety of organic components. This emphasizes the necessity of using real-time kappa(org), instead of fixed kappa(org), to calculate ALW(org) in Beijing. The significant variation in K org (calculated from O/C), together with highly variable organic or inorganic volume fractions, leads to a wide range of kappa(total) (between 0.20 and 0.45), which has a great impact on water uptake. The variation in organic O/C, or derived K org , was found to be influenced by temperature (T), ALW, and aerosol mass concentrations, among which T and ALW both have promoting effects on O/C. During high-ALW haze episodes, although the organic fraction decreases rapidly, O/C and derived K org increase with the increase in ALW, suggesting the formation of more soluble organics via heterogeneous uptake or aqueous processes. A positive feedback loop is thus formed: during high-ALW episodes, increasing kappa(org), together with decreasing particle organic fraction (or increasing particle inorganic fraction), increases kappa(total), and thus further promotes the ability of particles to uptake water. |
领域 | 地球科学 |
收录类别 | SCI-E |
WOS记录号 | WOS:000488977600001 |
WOS关键词 | CLOUD CONDENSATION NUCLEI ; HYGROSCOPICITY MODEL FRAMEWORK ; CHEMICAL-COMPOSITION ; PART 2 ; RELATIVE-HUMIDITY ; SECONDARY FORMATION ; SUBMICRON AEROSOLS ; DROPLET ACTIVATION ; MASS-SPECTROMETRY ; EQUILIBRIUM-MODEL |
WOS类目 | Environmental Sciences ; Meteorology & Atmospheric Sciences |
WOS研究方向 | Environmental Sciences & Ecology ; Meteorology & Atmospheric Sciences |
引用统计 | |
文献类型 | 期刊论文 |
条目标识符 | http://119.78.100.173/C666/handle/2XK7JSWQ/187166 |
专题 | 地球科学 |
作者单位 | 1.Tsinghua Univ, Sch Environm, State Key Joint Lab Environm Simulat & Pollut Con, Beijing 100084, Peoples R China; 2.Harvard Univ, Sch Engn & Appl Sci, Cambridge, MA 02138 USA; 3.Univ Helsinki, Fac Sci, Inst Atmospher & Earth Syst Res Phys, Helsinki, Finland; 4.Aerodyne Res Inc, Billerica, MA 01821 USA |
推荐引用方式 GB/T 7714 | Li, Xiaoxiao,Song, Shaojie,Zhou, Wei,et al. Interactions between aerosol organic components and liquid water content during haze episodes in Beijing[J]. ATMOSPHERIC CHEMISTRY AND PHYSICS,2019,19(19):12163-12174. |
APA | Li, Xiaoxiao,Song, Shaojie,Zhou, Wei,Hao, Jiming,Worsnop, Douglas R.,&Jiang, Jingkun.(2019).Interactions between aerosol organic components and liquid water content during haze episodes in Beijing.ATMOSPHERIC CHEMISTRY AND PHYSICS,19(19),12163-12174. |
MLA | Li, Xiaoxiao,et al."Interactions between aerosol organic components and liquid water content during haze episodes in Beijing".ATMOSPHERIC CHEMISTRY AND PHYSICS 19.19(2019):12163-12174. |
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