TY  - JOUR
AU  - McFiggans, Gordon
AU  - Mentel, Thomas F.
AU  - Wildt, Jürgen
AU  - Pullinen, Iida
AU  - Kang, Sungah
AU  - Kleist, Einhard
AU  - Schmitt, Sebastian
AU  - Springer, Monika
AU  - Tillmann, Ralf
AU  - Wu, Cheng
AU  - Zhao, Defeng
AU  - Hallquist, Mattias
AU  - Faxon, Cameron
AU  - Le Breton, Michael
AU  - Hallquist, Åsa M.
AU  - Simpson, David
AU  - Bergström, Robert
AU  - Jenkin, Michael E.
AU  - Ehn, Mikael
AU  - Thornton, Joel A.
AU  - Alfarra, M. Rami
AU  - Bannan, Thomas J.
AU  - Percival, Carl J.
AU  - Priestley, Michael
AU  - Topping, David
AU  - Kiendler-Scharr, Astrid
TI  - Secondary organic aerosol reduced by mixture of atmospheric vapours
JO  - Nature 
VL  - 565
IS  - 7741
SN  - 1476-4687
CY  - London [u.a.]
PB  - Nature Publ. Group78092
M1  - FZJ-2019-01469
SP  - 587 - 593
PY  - 2019
AB  - 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).
LB  - PUB:(DE-HGF)16
C6  - pmid:30700872
UR  - <Go to ISI:>//WOS:000457404000037
DO  - DOI:10.1038/s41586-018-0871-y
UR  - https://juser.fz-juelich.de/record/860808
ER  -