Secondary organic aerosol reduced by mixture of atmospheric vapours
Artikel i vetenskaplig tidskrift, 2019
Secondary organic aerosol contributes to the atmospheric particle burden with implications for air quality and climate. Biogenic volatile organic compounds such as terpenoids emitted from plants are important secondary organic aerosol precursors with isoprene dominating the emissions of biogenic volatile organic compounds globally. However, the particle mass from isoprene oxidation is generally modest compared to that of other terpenoids. Here we show that isoprene, carbon monoxide and methane can each suppress the instantaneous mass and the overall mass yield derived from monoterpenes in mixtures of atmospheric vapours. We find that isoprene ‘scavenges’ hydroxyl radicals, preventing their reaction with monoterpenes, and the resulting isoprene peroxy radicals scavenge highly oxygenated monoterpene products. These effects reduce the yield of low-volatility products that would otherwise form secondary organic aerosol. Global model calculations indicate that oxidant and product scavenging can operate effectively in the real atmosphere. Thus highly reactive compounds (such as isoprene) that produce a modest amount of aerosol are not necessarily net producers of secondary organic particle mass and their oxidation in mixtures of atmospheric vapours can suppress both particle number and mass of secondary organic aerosol. We suggest that formation mechanisms of secondary organic aerosol in the atmosphere need to be considered more realistically, accounting for mechanistic interactions between the products of oxidizing precursor molecules (as is recognized to be necessary when modelling ozone production).
Författare
G. McFiggans
University of Manchester
Th. F. Mentel
Forschungszentrum Jülich
J. Wildt
Forschungszentrum Jülich
Iida Pullinen
Forschungszentrum Jülich
Sungah Kang
Forschungszentrum Jülich
Einhard Kleist
Forschungszentrum Jülich
Sebastian Schmitt
Forschungszentrum Jülich
Monika Springer
Forschungszentrum Jülich
R. Tillmann
Forschungszentrum Jülich
Cheng Wu
Forschungszentrum Jülich
Defeng Zhao
Forschungszentrum Jülich
Fudan University
Mattias Hallquist
Göteborgs universitet
Cameron Faxon
Göteborgs universitet
Michael Le Breton
Göteborgs universitet
Åsa M. Hallquist
IVL Svenska Miljöinstitutet
David Simpson
Chalmers, Rymd-, geo- och miljövetenskap, Mikrovågs- och optisk fjärranalys
Robert Bergström
Göteborgs universitet
SMHI
Chalmers, Rymd-, geo- och miljövetenskap, Mikrovågs- och optisk fjärranalys
M. E. Jenkin
Atmospheric Chemistry Services
Mikael Ehn
Helsingin Yliopisto
Joel A. Thornton
University of Washington
M. Rami Alfarra
University of Manchester
Thomas J. Bannan
University of Manchester
C. J. Percival
University of Manchester
Michael Priestley
University of Manchester
Göteborgs universitet
D. Topping
University of Manchester
A. Kiendler-Scharr
Forschungszentrum Jülich
Nature
0028-0836 (ISSN) 1476-4687 (eISSN)
Vol. 565 7741 587-593Atmosfärisk oxidation av stress-inducerade emissioner från växtlighet - dess roll för aerosolbildning
Formas (942-2015-1537), 2016-01-01 -- 2018-12-31.
ModElling the Global Earth system (MERGE)
Lunds universitet (9945095), 2018-01-01 -- 2019-12-31.
Ämneskategorier
Meteorologi och atmosfärforskning
Fundament
Grundläggande vetenskaper
DOI
10.1038/s41586-018-0871-y
PubMed
30700872