Ozonolysis of <i>α</i>‐pinene at atmospherically relevant concentrations: Temperature dependence of aerosol mass fractions (yields)

Pathak, Ravi Kant; Stanier, Charles O.; Donahue, Neil M.; Pandis, Spyros Ν.

doi:10.1029/2006jd007436

Cited by 219 publications

(312 citation statements)

References 37 publications

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“…However, even after steady-state is reached, the particle counts decreased with increasing distance along the flow tube as expected from particle losses to the walls due to settling and coagulation. The wall loss constant, calculated in a manner similar to that of Pathak et al (2007) using data from P1 through P5 produced a value for k wall = 8.8 × 10 -5 s -1 . The measured particle counts at P2 FIG.…”

Section: A Co 2 Flow Studiesmentioning

confidence: 99%

A New Aerosol Flow System for Photochemical and Thermal Studies of Tropospheric Aerosols

Ezell

Johnson

et al. 2010

Aerosol Science and Technology

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For studying the formation and photochemical/thermal reactions of aerosols relevant to the troposphere, a unique, high-volume, slow-flow, stainless steel aerosol flow system equipped with UV lamps has been constructed and characterized experimentally. The total flow system length is 8.5 m and includes a 1.2 m section used for mixing, a 6.1 m reaction section and a 1.2 m transition cone at the end. The 45.7 cm diameter results in a smaller surface to volume ratio than is found in many other flow systems and thus reduces the potential contribution from wall reactions. The latter are also reduced by frequent cleaning of the flow tube walls which is made feasible by the ease of disassembly. The flow tube is equipped with ultraviolet lamps for photolysis. This flow system allows continuous sampling under stable conditions, thus increasing the amount Received 3 November 2009; accepted 10 January 2010. We are grateful to the U.S. Department of Energy (Grant # DE-FG02-05ER64000) for support of this work. Additional support was provided by the AirUCI Environmental Molecular Science Institute funded by the National Science Foundation (Grant # CHE-0431312). E.A.B. acknowledges financial support from a National Science Foundation graduate student fellowship. This research was in part in collaboration with the Environmental Molecular Sciences Laboratory, a national scientific user facility sponsored by the U.S. Address correspondence to Barbara J. Finlayson-Pitts, Department of Chemistry, University of California Irvine, Irvine, CA 92697-2025, USA. E-mail: bjfinlay@uci.edu of sample available for analysis and permitting a wide variety of analytical techniques to be applied simultaneously. The residence time is of the order of an hour, and sampling ports located along the length of the flow tube allow for time-resolved measurements of aerosol and gas-phase products. The system was characterized using both an "inert" gas (CO 2 ) and particles (atomized NaNO 3 ). Instruments interfaced directly to this flow system include a NO x analyzer, an ozone analyzer, relative humidity and temperature probes, a scanning mobility particle sizer spectrometer, an aerodynamic particle sizer spectrometer, a gas chromatograph-mass spectrometer, an integrating nephelometer, and a Fourier transform infrared spectrophotometer equipped with a long path (64 m) cell. Particles collected with impactors and filters at the various sampling ports can be analyzed subsequently by a variety of techniques. Formation of secondary organic aerosol from α-pinene reactions (NO x photooxidation and ozonolysis) are used to demonstrate the capabilities of this new system.

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Section: A Co 2 Flow Studiesmentioning

confidence: 99%

A New Aerosol Flow System for Photochemical and Thermal Studies of Tropospheric Aerosols

Ezell

Johnson

et al. 2010

Aerosol Science and Technology

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“…For the generation of biogenic SOA, a set of experiments utilizing the dark ozonolysis of α-pinene was conducted following the experimental conditions given by Pathak et al (2007), shown in Table 1. First, O 3 was introduced inside the chamber and then an injection of α-pinene initiated the production of SOA.…”

Section: Biogenic Soamentioning

confidence: 99%

Measurement of nonvolatile particle number size distribution

et al. 2016

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Abstract. An experimental methodology was developed to measure the nonvolatile particle number concentration using a thermodenuder (TD). The TD was coupled with a highresolution time-of-flight aerosol mass spectrometer, measuring the chemical composition and mass size distribution of the submicrometer aerosol and a scanning mobility particle sizer (SMPS) that provided the number size distribution of the aerosol in the range from 10 to 500 nm. The method was evaluated with a set of smog chamber experiments and achieved almost complete evaporation (> 98 %) of secondary organic as well as freshly nucleated particles, using a TD temperature of 400 • C and a centerline residence time of 15 s.This experimental approach was applied in a winter field campaign in Athens and provided a direct measurement of number concentration and size distribution for particles emitted from major pollution sources. During periods in which the contribution of biomass burning sources was dominant, more than 80 % of particle number concentration remained after passing through the thermodenuder, suggesting that nearly all biomass burning particles had a nonvolatile core. These remaining particles consisted mostly of black carbon (60 % mass contribution) and organic aerosol (OA; 40 %). Organics that had not evaporated through the TD were mostly biomass burning OA (BBOA) and oxygenated OA (OOA) as determined from AMS source apportionment analysis. For periods during which traffic contribution was dominant 50-60 % of the particles had a nonvolatile core while the rest evaporated at 400 • C. The remaining particle mass consisted mostly of black carbon with an 80 % contribution, while OA was responsible for another 15-20 %. Organics were mostly hydrocarbon-like OA (HOA) and OOA. These results suggest that even at 400 • C some fraction of the OA does not evaporate from particles emitted from common combustion processes, such as biomass burning and car engines, indicating that a fraction of this type of OA is of extremely low volatility.

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“…Fry et al, 2009;Cai and Griffin, 2006;Griffin et al, 1999;Hoffmann et al, 1997), seed aerosol (e.g. Kroll et al, 2007;Pathak et al, 2007;Chan et al, 2007;Cocker et al, 2001), temperature (e.g. von Hessberg, et al, 2009;Saathoff et al, 2009;Pathak et al, 2007), relative humidity (RH) (e.g.…”

Section: Q Hao Et Al: Mass Yields Of Secondary Organic Aerosolsmentioning

confidence: 99%

“…Kroll et al, 2007;Pathak et al, 2007;Chan et al, 2007;Cocker et al, 2001), temperature (e.g. von Hessberg, et al, 2009;Saathoff et al, 2009;Pathak et al, 2007), relative humidity (RH) (e.g. von Hessberg, et al, 2009;Cocker et al, 2001;, UV intensity (e.g.…”

Section: Q Hao Et Al: Mass Yields Of Secondary Organic Aerosolsmentioning

confidence: 99%

Mass yields of secondary organic aerosols from the oxidation of α-pinene and real plant emissions

et al. 2011

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Abstract. Biogenic volatile organic compounds (VOCs) are a significant source of global secondary organic aerosol (SOA); however, quantifying their aerosol forming potential remains a challenge. This study presents smog chamber laboratory work, focusing on SOA formation via oxidation of the emissions of two dominant tree species from boreal forest area, Scots pine (Pinus sylvestris L.) and Norway spruce (Picea abies), by hydroxyl radical (OH) and ozone (O 3 ). Oxidation of α-pinene was also studied as a reference system. Tetramethylethylene (TME) and 2-butanol were added to control OH and O 3 levels, thereby allowing SOA formation events to be categorized as resulting from either OHdominated or O 3 -initiated chemistry. SOA mass yields from α-pinene are consistent with previous studies while the yields from the real plant emissions are generally lower than that from α-pinene, varying from 1.9% at an aerosol mass loading of 0.69 µg m −3 to 17.7% at 26.0 µg m −3 . Mass yields from oxidation of real plant emissions are subject to the interactive effects of the molecular structures of plant emissions and their reaction chemistry with OH and O 3 , which Correspondence to: L. Q. Hao (hao.liqing@uef.fi) lead to variations in condensable product volatility. SOA formation can be reproduced with a two-product gas-phase partitioning absorption model in spite of differences in the source of oxidant species and product volatility in the real plant emission experiments. Condensable products from OH-dominated chemistry showed a higher volatility than those from O 3 -initiated systems during aerosol growth stage. Particulate phase products became less volatile via aging process which continued after input gas-phase oxidants had been completely consumed.

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Ozonolysis of α‐pinene at atmospherically relevant concentrations: Temperature dependence of aerosol mass fractions (yields)

Cited by 219 publications

References 37 publications

A New Aerosol Flow System for Photochemical and Thermal Studies of Tropospheric Aerosols

A New Aerosol Flow System for Photochemical and Thermal Studies of Tropospheric Aerosols

Measurement of nonvolatile particle number size distribution

Mass yields of secondary organic aerosols from the oxidation of α-pinene and real plant emissions

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