Influence of relative humidity on the heterogeneous oxidation of secondary organic aerosol

Secondary organic aerosol (SOA) is a complex mixture of hundreds of semi-volatile to extremely low-volatility organic compounds that are chemically processed in the atmosphere, including via heterogeneous oxidation by gas-phase radicals. Relative humidity (RH) has a substantial impact on particle ph...

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Bibliographic Details
Published in:Atmospheric chemistry and physics 2018-10, Vol.18 (19), p.14585-14608
Main Authors: Li, Ziyue, Smith, Katherine A, Cappa, Christopher D
Format: Article
Language:English
Subjects:
Aerosols
Ageing
Aging
Atmosphere
Chemical properties
Continuity (mathematics)
Environmental aspects
Exposure
Free radicals
Humidity
Mass
Mass spectra
Mass spectrometry
Mass spectroscopy
Observations
Organic chemistry
Organic compounds
Oxidation
Oxidation-reduction reactions
Ozonolysis
Particle composition
Probability theory
Radicals
Relative humidity
Secondary aerosols
Spectra
Uptake
Vacuum
Volatility
α-Pinene
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Summary:Secondary organic aerosol (SOA) is a complex mixture of hundreds of semi-volatile to extremely low-volatility organic compounds that are chemically processed in the atmosphere, including via heterogeneous oxidation by gas-phase radicals. Relative humidity (RH) has a substantial impact on particle phase, which can affect how SOA evolves in the atmosphere. In this study, SOA from dark α-pinene ozonolysis is heterogeneously aged by OH radicals in a flow tube at low and high RH. At high RH (RH =89 %) there is substantial loss of particle volume (∼60 %) at an equivalent atmospheric OH exposure of 3 weeks. In contrast, at low RH (RH =25 %) there is little mass loss (
ISSN:1680-7324
1680-7316
1680-7324
DOI:10.5194/acp-18-14585-2018