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DOI	10.5194/acp-21-16161-2021
	Physical and chemical properties of black carbon and organic matter from different combustion and photochemical sources using aerodynamic aerosol classification
	Hu D.; Alfarra M.R.; Szpek K.; Langridge J.M.; Cotterell M.I.; Belcher C.; Rule I.; Liu Z.; Yu C.; Shao Y.; Voliotis A.; Du M.; Smith B.; Smallwood G.; Lobo P.; Liu D.; Haywood J.M.; Coe H.; Allan J.D.
发表日期	2021
ISSN	1680-7316
起始页码	16161
结束页码	16182
卷号	21 期号:21
英文摘要	The physical and chemical properties of black carbon (BC) and organic aerosols are important for predicting their radiative forcing in the atmosphere. During the Soot Aerodynamic Size Selection for Optical properties (SASSO) project and a EUROCHAMP-2020 transnational access project, different types of light-absorbing carbon were studied, including BC from catalytically stripped diesel exhaust, an inverted flame burner, a colloidal graphite standard (Aquadag) and controlled flaming wood combustion. Brown carbon (BrC) was also investigated in the form of organic aerosol emissions from wood burning (pyrolysis and smouldering) and from the nitration of secondary organic aerosol (SOA) proxies produced in a photochemical reaction chamber. Here we present insights into the physical and chemical properties of the aerosols, with optical properties presented in subsequent publications. The dynamic shape factor (χ) of BC particles and material density (ρm) of organic aerosols was investigated by coupling a charging-free Aerodynamic Aerosol Classifier (AAC) with a Centrifugal Particle Mass Analyzer (CPMA) and a Scanning Mobility Particle Sizer (SMPS). The morphology of BC particles was captured by transmission electron microscopy (TEM). For BC particles from the diesel engine and flame burner emissions, the primary spherule sizes were similar, around 20 nm. With increasing particle size, BC particles adopted more collapsed/compacted morphologies for the former source but tended to show more aggregated morphologies for the latter source. For particles emitted from the combustion of dry wood samples, the χ of BC particles and the ρm of organic aerosols were observed in the ranges 1.8-2.17 and 1.22-1.32 g cm-3, respectively. Similarly, for wet wood samples, the χ and ρm ranges were 1.2-1.85 and 1.44-1.60 g cm-3, respectively. Aerosol mass spectrometry measurements show no clear difference in mass spectra of the organic aerosols in individual burn phases (pyrolysis or smouldering phase) with the moisture content of the wood samples. This suggests that the effect moisture has on the organic chemical profile of wood burning emissions is through changing the durations of the different phases of the burn cycle, not through the chemical modification of the individual phases. In this study, the incandescence signal of a Single Particle Soot Photometer (SP2) was calibrated with three different types of BC particles and compared with that from an Aquadag standard that is commonly used to calibrate SP2 incandescence to a BC mass. A correction factor is defined as the ratio of the incandescence signal from an alternative BC source to that from the Aquadag standard and took values of 0.821 ± 0.002 (or 0.794 ± 0.005), 0.879 ± 0.003 and 0.843 ± 0.028 to 0.913 ± 0.009 for the BC particles emitted from the diesel engine running under hot (or cold idle) conditions, the flame burner and wood combustion, respectively. These correction factors account for differences in instrument response to BC from different sources compared to the standardised Aquadag calibration and are more appropriate than the common value of 0.75 recommended by Laborde et al. (2012b) when deriving the mass concentration of BC emitted from diesel engines. Quantifying the correction factor for many types of BC particles found commonly in the atmosphere may enable better constraints to be placed on this factor depending on the BC source being sampled and thus improve the accuracy of future SP2 measurements of BC mass concentrations. © Author(s) 2021.
语种	英语
scopus关键词	aerodynamics; aerosol; black carbon; combustion; optical property; organic matter; photochemistry; physicochemical property
来源期刊	ATMOSPHERIC CHEMISTRY AND PHYSICS
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/246464
作者单位	Department of Earth and Environmental Sciences, University of Manchester, Manchester, United Kingdom; National Centre for Atmospheric Science, University of Manchester, Manchester, United Kingdom; Observation Based Research, Met Office, Exeter, United Kingdom; College for Engineering, Mathematics and Physical Sciences, University of Exeter, Exeter, United Kingdom; School of Chemistry, University of Bristol, Bristol, United Kingdom; Metrology Research Centre, National Research Council Canada, Ottawa, Canada; Department of Atmospheric Sciences, School of Earth Sciences, Zhejiang University, Zhejiang, Hangzhou, China; Qatar Environment and Energy Research Institute (QEERI), Hamad Bin Khalifa University (HBKU), Doha, Qatar
推荐引用方式 GB/T 7714	Hu D.,Alfarra M.R.,Szpek K.,et al. Physical and chemical properties of black carbon and organic matter from different combustion and photochemical sources using aerodynamic aerosol classification[J],2021,21(21).
APA	Hu D..,Alfarra M.R..,Szpek K..,Langridge J.M..,Cotterell M.I..,...&Allan J.D..(2021).Physical and chemical properties of black carbon and organic matter from different combustion and photochemical sources using aerodynamic aerosol classification.ATMOSPHERIC CHEMISTRY AND PHYSICS,21(21).
MLA	Hu D.,et al."Physical and chemical properties of black carbon and organic matter from different combustion and photochemical sources using aerodynamic aerosol classification".ATMOSPHERIC CHEMISTRY AND PHYSICS 21.21(2021).