title: Aging of biogenic secondary organic aerosol via gas-phase OH radical reactions.
abstract: The Multiple Chamber Aerosol Chemical Aging Study (MUCHACHAS) tested the hypothesis that hydroxyl radical (OH) aging significantly increases the concentration of first-generation biogenic secondary organic aerosol (SOA). OH is the dominant atmospheric oxidant, and MUCHACHAS employed environmental chambers of very different designs, using multiple OH sources to explore a range of chemical conditions and potential sources of systematic error. We isolated the effect of OH aging, confirming our hypothesis while observing corresponding changes in SOA properties. The mass increases are consistent with an existing gap between global SOA sources and those predicted in models, and can be described by a mechanism suitable for implementation in those models.
authors.affiliation: Center for Atmospheric Particle Studies, Carnegie Mellon University, Pittsburgh, PA 15217, USA. nmd@andrew.cmu.edu
authors.forename: Neil M
authors.initials: NM
authors.lastname: Donahue
authors.forename: Kaytlin M
authors.initials: KM
authors.lastname: Henry
authors.forename: Thomas F
authors.initials: TF
authors.lastname: Mentel
authors.forename: Astrid
authors.initials: A
authors.lastname: Kiendler-Scharr
authors.forename: Christian
authors.initials: C
authors.lastname: Spindler
authors.forename: Birger
authors.initials: B
authors.lastname: Bohn
authors.forename: Theo
authors.initials: T
authors.lastname: Brauers
authors.forename: Hans P
authors.initials: HP
authors.lastname: Dorn
authors.forename: Hendrik
authors.initials: H
authors.lastname: Fuchs
authors.forename: Ralf
authors.initials: R
authors.lastname: Tillmann
authors.forename: Andreas
authors.initials: A
authors.lastname: Wahner
authors.forename: Harald
authors.initials: H
authors.lastname: Saathoff
authors.forename: Karl-Heinz
authors.initials: KH
authors.lastname: Naumann
authors.forename: Ottmar
authors.initials: O
authors.lastname: Möhler
authors.forename: Thomas
authors.initials: T
authors.lastname: Leisner
authors.forename: Lars
authors.initials: L
authors.lastname: Müller
authors.forename: Marc-Christopher
authors.initials: MC
authors.lastname: Reinnig
authors.forename: Thorsten
authors.initials: T
authors.lastname: Hoffmann
authors.forename: Kent
authors.initials: K
authors.lastname: Salo
authors.forename: Mattias
authors.initials: M
authors.lastname: Hallquist
authors.forename: Mia
authors.initials: M
authors.lastname: Frosch
authors.forename: Merete
authors.initials: M
authors.lastname: Bilde
authors.forename: Torsten
authors.initials: T
authors.lastname: Tritscher
authors.forename: Peter
authors.initials: P
authors.lastname: Barmet
authors.forename: Arnaud P
authors.initials: AP
authors.lastname: Praplan
authors.forename: Peter F
authors.initials: PF
authors.lastname: DeCarlo
authors.forename: Josef
authors.initials: J
authors.lastname: Dommen
authors.forename: Andre S H
authors.initials: AS
authors.lastname: Prévôt
authors.forename: Urs
authors.initials: U
authors.lastname: Baltensperger
mesh_terms: D000336:Aerosols / Q000737:chemistry*; D001272:Atmosphere; D005609:Free Radicals; D017665:Hydroxyl Radical; D013058:Mass Spectrometry / Q000379:methods; D008956:Models, Chemical; D009930:Organic Chemicals / Q000737:chemistry*; D010100:Oxygen / Q000737:chemistry; D010126:Ozone; D015203:Reproducibility of Results; D012997:Solvents / Q000737:chemistry; D014466:Ultraviolet Rays
chemical_list: D000336:Aerosols; D005609:Free Radicals; D009930:Organic Chemicals; D012997:Solvents; D017665:Hydroxyl Radical; D010126:Ozone; D010100:Oxygen