Hydroxyl radical-induced formation of highly oxidized organic compounds

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http://hdl.handle.net/10138/172820

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Berndt , T , Richters , S , Jokinen , T , Hyttinen , N , Kurten , T , Otkjaer , R V , Kjaergaard , H G , Stratmann , F , Herrmann , H , Sipilä , M , Kulmala , M & Ehn , M 2016 , ' Hydroxyl radical-induced formation of highly oxidized organic compounds ' , Nature Communications , vol. 7 , 13677 . https://doi.org/10.1038/ncomms13677

Title: Hydroxyl radical-induced formation of highly oxidized organic compounds
Author: Berndt, Torsten; Richters, Stefanie; Jokinen, Tuija; Hyttinen, Noora; Kurten, Theo; Otkjaer, Rasmus V.; Kjaergaard, Henrik G.; Stratmann, Frank; Herrmann, Hartmut; Sipilä, Mikko; Kulmala, Markku; Ehn, Mikael
Contributor: University of Helsinki, Department of Physics
University of Helsinki, Department of Chemistry
University of Helsinki, Department of Chemistry
University of Helsinki, Department of Physics
University of Helsinki, Department of Physics
University of Helsinki, Department of Physics
Date: 2016-12-02
Language: eng
Number of pages: 8
Belongs to series: Nature Communications
ISSN: 2041-1723
URI: http://hdl.handle.net/10138/172820
Abstract: Explaining the formation of secondary organic aerosol is an intriguing question in atmospheric sciences because of its importance for Earth's radiation budget and the associated effects on health and ecosystems. A breakthrough was recently achieved in the understanding of secondary organic aerosol formation from ozone reactions of biogenic emissions by the rapid formation of highly oxidized multifunctional organic compounds via autoxidation. However, the important daytime hydroxyl radical reactions have been considered to be less important in this process. Here we report measurements on the reaction of hydroxyl radicals with alpha- and beta- pinene applying improved mass spectrometric methods. Our laboratory results prove that the formation of highly oxidized products from hydroxyl radical reactions proceeds with considerably higher yields than previously reported. Field measurements support these findings. Our results allow for a better description of the diurnal behaviour of the highly oxidized product formation and subsequent secondary organic aerosol formation in the atmosphere.
Subject: MASS-SPECTROMETER
ALPHA-PINENE
ATMOSPHERIC CONDITIONS
PEROXY-RADICALS
SULFURIC-ACID
RO2 RADICALS
AEROSOL
CHEMISTRY
H2SO4
OH
114 Physical sciences
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