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DOI | 10.5194/acp-17-10477-2017 |
An efficient approach for treating composition-dependent diffusion within organic particles | |
O&1; 39;Meara, Simon2 | |
2017-09-07 | |
发表期刊 | ATMOSPHERIC CHEMISTRY AND PHYSICS
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ISSN | 1680-7316 |
EISSN | 1680-7324 |
出版年 | 2017 |
卷号 | 17期号:17 |
文章类型 | Article |
语种 | 英语 |
国家 | England; USA |
英文摘要 | Mounting evidence demonstrates that under certain conditions the rate of component partitioning between the gas and particle phase in atmospheric organic aerosol is limited by particle-phase diffusion. To date, however, particle-phase diffusion has not been incorporated into regional atmospheric models. An analytical rather than numerical solution to diffusion through organic particulate matter is desirable because of its comparatively small computational expense in regional models. Current analytical models assume diffusion to be independent of composition and therefore use a constant diffusion coefficient. To realistically model diffusion, however, it should be composition-dependent (e.g. due to the partitioning of components that plasticise, vitrify or solidify). This study assesses the modelling capability of an analytical solution to diffusion corrected to account for composition dependence against a numerical solution. Results show reasonable agreement when the gas-phase saturation ratio of a partitioning component is constant and particle-phase diffusion limits partitioning rate (<10% discrepancy in estimated radius change). However, when the saturation ratio of the partitioning component varies, a generally applicable correction cannot be found, indicating that existing methodologies are incapable of deriving a general solution. Until such time as a general solution is found, caution should be given to sensitivity studies that assume constant diffusivity. The correction was implemented in the polydisperse, multi-process Model for Simulating Aerosol Interactions and Chemistry (MOSAIC) and is used to illustrate how the evolution of number size distribution may be accelerated by condensation of a plasticising component onto viscous organic particles. |
领域 | 地球科学 |
收录类别 | SCI-E |
WOS记录号 | WOS:000409466300003 |
WOS关键词 | AEROSOL-PARTICLES ; PHASE STATE ; ATMOSPHERIC AEROSOLS ; COMPONENT PROPERTIES ; VOLATILITY ; MODEL ; WATER ; COEFFICIENT ; PREDICTIONS ; SENSITIVITY |
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/18341 |
专题 | 地球科学 |
作者单位 | 1.Univ Manchester, Sch Earth & Environm Sci, Ctr Atmospher Sci, Manchester M13 9PL, Lancs, England; 2.Univ Manchester, NCAS, Manchester M13 9PL, Lancs, England; 3.Pacific Northwest Natl Lab, Atmospher Sci & Global Change Div, Richland, WA 99352 USA |
推荐引用方式 GB/T 7714 | O&,39;Meara, Simon. An efficient approach for treating composition-dependent diffusion within organic particles[J]. ATMOSPHERIC CHEMISTRY AND PHYSICS,2017,17(17). |
APA | O&,&39;Meara, Simon.(2017).An efficient approach for treating composition-dependent diffusion within organic particles.ATMOSPHERIC CHEMISTRY AND PHYSICS,17(17). |
MLA | O&,et al."An efficient approach for treating composition-dependent diffusion within organic particles".ATMOSPHERIC CHEMISTRY AND PHYSICS 17.17(2017). |
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