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DOI | 10.5194/acp-19-5959-2019 |
Timescales of secondary organic aerosols to reach equilibrium at various temperatures and relative humidities | |
Li, Ying; Shiraiwa, Manabu | |
2019-05-07 | |
发表期刊 | ATMOSPHERIC CHEMISTRY AND PHYSICS |
ISSN | 1680-7316 |
EISSN | 1680-7324 |
出版年 | 2019 |
卷号 | 19期号:9页码:5959-5971 |
文章类型 | Article |
语种 | 英语 |
国家 | USA |
英文摘要 | Secondary organic aerosols (SOA) account for a substantial fraction of air particulate matter, and SOA formation is often modeled assuming rapid establishment of gas-particle equilibrium. Here, we estimate the characteristic timescale for SOA to achieve gas-particle equilibrium under a wide range of temperatures and relative humidities using a state-of-the-art kinetic flux model. Equilibration timescales were calculated by varying particle phase state, size, mass loadings, and volatility of organic compounds in open and closed systems. Model simulations suggest that the equilibration timescale for semi-volatile compounds is on the order of seconds or minutes for most conditions in the planetary boundary layer, but it can be longer than 1 h if particles adopt glassy or amorphous solid states with high glass transition temperatures at low relative humidity. In the free troposphere with lower temperatures, it can be longer than hours or days, even at moderate or relatively high relative humidities due to kinetic limitations of bulk diffusion in highly viscous particles. The timescale of partitioning of low-volatile compounds into highly viscous particles is shorter compared to semi-volatile compounds in the closed system, as it is largely determined by condensation sink due to very slow re-evaporation with relatively quick establishment of local equilibrium between the gas phase and the near-surface bulk. The dependence of equilibration timescales on both volatility and bulk diffusivity provides critical insights into thermodynamic or kinetic treatments of SOA partitioning for accurate predictions of gas-and particle-phase concentrations of semi-volatile compounds in regional and global chemical transport models. |
领域 | 地球科学 |
收录类别 | SCI-E |
WOS记录号 | WOS:000467099900001 |
WOS关键词 | SIZE DISTRIBUTION DYNAMICS ; PARTICLE PHASE STATE ; CLOUD CONDENSATION NUCLEI ; KINETIC MULTILAYER MODEL ; GLASS-TRANSITION ; PHYSICAL STATE ; GAS ; EVAPORATION ; VOLATILITY ; SEPARATION |
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/183169 |
专题 | 地球科学 |
作者单位 | Univ Calif Irvine, Dept Chem, Irvine, CA 92717 USA |
推荐引用方式 GB/T 7714 | Li, Ying,Shiraiwa, Manabu. Timescales of secondary organic aerosols to reach equilibrium at various temperatures and relative humidities[J]. ATMOSPHERIC CHEMISTRY AND PHYSICS,2019,19(9):5959-5971. |
APA | Li, Ying,&Shiraiwa, Manabu.(2019).Timescales of secondary organic aerosols to reach equilibrium at various temperatures and relative humidities.ATMOSPHERIC CHEMISTRY AND PHYSICS,19(9),5959-5971. |
MLA | Li, Ying,et al."Timescales of secondary organic aerosols to reach equilibrium at various temperatures and relative humidities".ATMOSPHERIC CHEMISTRY AND PHYSICS 19.9(2019):5959-5971. |
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