Multiphase OH oxidation kinetics of organic aerosol: The role of particle phase state and relative humidity
J. H. Slade,Daniel A. Knopf +1 more
TLDR
In this paper, the phase state of organic aerosol was analyzed in response to changes in relative humidity (RH), thereby influencing heterogeneous reaction rates with trace gas species, and the importance of phase state to accurately describe the multiphase chemical kinetics and thus chemical aging process.Abstract:
Organic aerosol can exhibit different phase states in response to changes in relative humidity (RH), thereby influencing heterogeneous reaction rates with trace gas species. OH radical uptake by laboratory-generated levoglucosan and methyl-nitrocatechol particles, serving as surrogates for biomass burning aerosol, is determined as a function of RH. Increasing RH lowers the viscosity of amorphous levoglucosan aerosol particles enabling enhanced OH uptake. Conversely, OH uptake by methyl-nitrocatechol aerosol particles is suppressed at higher RH as a result of competitive coadsorption of H2O that occupies reactive sites. This is shown to have substantial impacts on organic aerosol lifetimes with respect to OH oxidation. The results emphasize the importance of organic aerosol phase state to accurately describe the multiphase chemical kinetics and thus chemical aging process in atmospheric models to better represent the evolution of organic aerosol and its role in air quality and climate.read more
Citations
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Photochemical processing of aqueous atmospheric brown carbon
TL;DR: In this paper, a series of laboratory studies of photochemical processing of aerosol brown carbon in the aqueous phase, by direct photolysis and OH oxidation, was reported. And the results indicated that atmospheric models need to incorporate representations of atmospheric processing of BrC species to accurately model their radiative impacts.
Journal ArticleDOI
The Role of Organic Aerosol in Atmospheric Ice Nucleation: A Review
TL;DR: In this article, a review of the role of organic matter in the formation of ice nucleating particles (INPs) is presented, summarizing and highlighting recent advances in understanding of the ice nucleation process gained from theoretical, laboratory, and field studies.
Journal ArticleDOI
An overview of particulate emissions from residential biomass combustion
Estela D. Vicente,Célia Alves +1 more
TL;DR: In this paper, an extensive tabulation of particulate matter emission factors obtained worldwide is presented and critically evaluated, and the suitability of specific organic markers to assign the input of residential biomass combustion to the ambient carbonaceous aerosol are also discussed.
Journal ArticleDOI
Levoglucosan as a tracer of biomass burning: Recent progress and perspectives
Hemraj Bhattarai,Eri Saikawa,Xin Wan,Hongxia Zhu,Kirpa Ram,Kirpa Ram,Shaopeng Gao,Shichang Kang,Qianggong Zhang,Qianggong Zhang,Yulan Zhang,Guangming Wu,Xiaoping Wang,Xiaoping Wang,Kimitaka Kawamura,Pingqing Fu,Zhiyuan Cong,Zhiyuan Cong +17 more
TL;DR: A review of the applicability of levoglucosan as a biomass burning tracer in different environmental matrices such as aerosols, marine, snow and ice-cores is provided in this paper.
Journal ArticleDOI
The formation of nitro-aromatic compounds under high NO x and anthropogenic VOC conditions in urban Beijing, China
Yujue Wang,Min Hu,Yuchen Wang,Jing Zheng,Dongjie Shang,Yudong Yang,Ying Liu,X. Li,Rongzhi Tang,Wenfei Zhu,Zhuofei Du,Yusheng Wu,Song Guo,Zhijun Wu,Shengrong Lou,Mattias Hallquist,Jian Zhen Yu +16 more
TL;DR: In this article, the authors investigated the factors that influence NAC formation (e.g., NO2, VOC precursors, RH and photolysis) through quantification of eight NACs, along with major components in fine particulate matter, selected volatile organic compounds, and gases.
References
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The formation, properties and impact of secondary organic aerosol: current and emerging issues
Mattias Hallquist,John C. Wenger,Urs Baltensperger,Yinon Rudich,David Simpson,David Simpson,Magda Claeys,J. Dommen,Neil M. Donahue,Christian George,Christian George,Allen H. Goldstein,Jacqueline F. Hamilton,Hartmut Herrmann,Thorsten Hoffmann,Yoshiteru Iinuma,Myoseon Jang,Michael E. Jenkin,Jose L. Jimenez,Astrid Kiendler-Scharr,Willy Maenhaut,Gordon McFiggans,Th. F. Mentel,Anne Monod,André S. H. Prévôt,John H. Seinfeld,Jason D. Surratt,Rafal Szmigielski,Jürgen Wildt +28 more
TL;DR: In this article, an overview of the atmospheric degradation mechanisms for SOA precursors, gas-particle partitioning theory and analytical techniques used to determine the chemical composition of SOA is presented.
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Biomass Burning in the Tropics: Impact on Atmospheric Chemistry and Biogeochemical Cycles
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Source apportionment of airborne particulate matter using organic compounds as tracers
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Smoking Rain Clouds over the Amazon
Meinrat O. Andreae,Daniel Rosenfeld,Paulo Artaxo,Alexandre Araújo Costa,Göran Frank,Karla Longo,M. A. F. Silva-Dias +6 more
TL;DR: Heavy smoke from forest fires in the Amazon was observed to reduce cloud droplet size and so delay the onset of precipitation, which affects the water cycle, the pollution burden of the atmosphere, and the dynamics of atmospheric circulation.
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