Global S&T Development Trend Analysis Platform of Resources and Environment
DOI | 10.5194/acp-20-8201-2020 |
Predicting secondary organic aerosol phase state and viscosity and its effect on multiphase chemistry in a regional-scale air quality model | |
Schmedding, Ryan1,8; Rasool, Quazi Z.1,9; Zhang, Yue1,4; Pye, Havala O. T.1,2; Zhang, Haofei3; Chen, Yuzhi1; Surratt, Jason D.1; Lopez-Hilfiker, Felipe D.5,10; Thornton, Joel A.5; Goldstein, Allen H.6,7; Vizuete, William1 | |
2020-07-16 | |
发表期刊 | ATMOSPHERIC CHEMISTRY AND PHYSICS |
ISSN | 1680-7316 |
EISSN | 1680-7324 |
出版年 | 2020 |
卷号 | 20期号:13页码:8201-8225 |
文章类型 | Article |
语种 | 英语 |
国家 | USA; Canada; Switzerland |
英文摘要 | Atmospheric aerosols are a significant public health hazard and have substantial impacts on the climate. Secondary organic aerosols (SOAs) have been shown to phase separate into a highly viscous organic outer layer surrounding an aqueous core. This phase separation can decrease the partitioning of semi-volatile and low-volatile species to the organic phase and alter the extent of acid-catalyzed reactions in the aqueous core. A new algorithm that can determine SOA phase separation based on their glass transition temperature (T-g), oxygen to carbon (O : C) ratio and organic mass to sulfate ratio, and meteorological conditions was implemented into the Community Multiscale Air Quality Modeling (CMAQ) system version 5.2.1 and was used to simulate the conditions in the continental United States for the summer of 2013. SOA formed at the ground/surface level was predicted to be phase separated with core-shell morphology, i.e., aqueous inorganic core surrounded by organic coating 65.4 % of the time during the 2013 Southern Oxidant and Aerosol Study (SOAS) on average in the isoprene-rich southeastern United States. Our estimate is in proximity to the previously reported similar to 70 % in literature. The phase states of organic coatings switched between semi-solid and liquid states, depending on the environmental conditions. The semi-solid shell occurring with lower aerosol liquid water content (western United States and at higher altitudes) has a viscosity that was predicted to be 10(2)-10(12) Pas, which resulted in organic mass being decreased due to diffusion limitation. Organic aerosol was primarily liquid where aerosol liquid water was dominant (eastern United States and at the surface), with a viscosity < 10(2) Pas. Phase separation while in a liquid phase state, i.e., liquid-liquid phase separation (LLPS), also reduces reactive uptake rates relative to homogeneous internally mixed liquid morphology but was lower than aerosols with a thick viscous organic shell. The sensitivity cases performed with different phase-separation parameterization and dissolution rate of isoprene epoxydiol (IEPDX) into the particle phase in CMAQ can have varying impact on fine particulate matter (PM2.5) organic mass, in terms of bias and error compared to field data collected during the 2013 SOAS. This highlights the need to better constrain the parameters that govern phase state and morphology of SOA, as well as expand mechanistic representation of multiphase chemistry for non-IEPDX SOA formation in models aided by novel experimental insights. |
领域 | 地球科学 |
收录类别 | SCI-E |
WOS记录号 | WOS:000551510500001 |
WOS关键词 | ALPHA-PINENE OZONOLYSIS ; SOUTHEAST UNITED-STATES ; REACTIVE UPTAKE ; CHEMICAL-COMPOSITION ; PARTICULATE MATTER ; RELATIVE-HUMIDITY ; EPOXIDE FORMATION ; GLASS-TRANSITION ; MIXING TIMES ; ISOPRENE |
WOS类目 | Environmental Sciences ; Meteorology & Atmospheric Sciences |
WOS研究方向 | Environmental Sciences & Ecology ; Meteorology & Atmospheric Sciences |
URL | 查看原文 |
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/284162 |
专题 | 地球科学 |
作者单位 | 1.Univ N Carolina, Dept Environm Sci & Engn, Chapel Hill, NC 27516 USA; 2.US EPA, Off Res & Dev, Durham, NC 27709 USA; 3.Univ Calif Riverside, Dept Chem, Riverside, CA 92521 USA; 4.Aerodyne Res Inc, Billerica, MA 01821 USA; 5.Univ Washington, Dept Atmospher Sci, Seattle, WA 98195 USA; 6.Univ Calif Berkeley, Dept Environm Sci Policy & Management, Berkeley, CA 94720 USA; 7.Univ Calif Berkeley, Dept Civil & Environm Engn, Berkeley, CA 94720 USA; 8.McGill Univ, Dept Atmospher & Ocean Sci, Montreal, PQ H3A 2K6, Canada; 9.Pacific Northwest Natl Lab, Richland, WA 99354 USA; 10.Tofwerk AG, CH-3600 Thun, Switzerland |
推荐引用方式 GB/T 7714 | Schmedding, Ryan,Rasool, Quazi Z.,Zhang, Yue,et al. Predicting secondary organic aerosol phase state and viscosity and its effect on multiphase chemistry in a regional-scale air quality model[J]. ATMOSPHERIC CHEMISTRY AND PHYSICS,2020,20(13):8201-8225. |
APA | Schmedding, Ryan.,Rasool, Quazi Z..,Zhang, Yue.,Pye, Havala O. T..,Zhang, Haofei.,...&Vizuete, William.(2020).Predicting secondary organic aerosol phase state and viscosity and its effect on multiphase chemistry in a regional-scale air quality model.ATMOSPHERIC CHEMISTRY AND PHYSICS,20(13),8201-8225. |
MLA | Schmedding, Ryan,et al."Predicting secondary organic aerosol phase state and viscosity and its effect on multiphase chemistry in a regional-scale air quality model".ATMOSPHERIC CHEMISTRY AND PHYSICS 20.13(2020):8201-8225. |
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