Journal Article

FZJ-2021-02445

http://join2-wiki.gsi.de/foswiki/pub/Main/Artwork/join2_logo100x88.png Gas-Particle Partitioning and SOA Yields of Organonitrate Products from NO 3 -Initiated Oxidation of Isoprene under Varied Chemical Regimes

Brownwood, B. ; Turdziladze, A.FZJ* ; Hohaus, T.FZJ* ; Wu, R.FZJ* ; Mentel, T. F.FZJ* ; Carlsson, P. T. M.FZJ* ; Tsiligiannis, E. ; Hallquist, M. ; Andres, S.FZJ* ; Hantschke, L.FZJ* ; Reimer, D.FZJ* ; Rohrer, F.FZJ* ; Tillmann, R.FZJ* ; Winter, B.FZJ* ; Liebmann, J. ; Brown, S. S. ; Kiendler-Scharr, A.FZJ* ; Novelli, A.FZJ* ; Fuchs, H.FZJ* ; Fry, J. (Corresponding author)

2021
ACS Publications Washington, DC

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Please use a persistent id in citations: http://hdl.handle.net/2128/27897  doi:10.1021/acsearthspacechem.0c00311

Abstract: Alkyl nitrate (AN) and secondary organic aerosol (SOA) from the reaction of nitrate radicals (NO3) with isoprene were observed in the Simulation of Atmospheric PHotochemistry In a large Reaction (SAPHIR) chamber during the NO3Isop campaign in August 2018. Based on 15 day-long experiments under various reaction conditions, we conclude that the reaction has a nominally unity molar AN yield (observed range 90 ± 40%) and an SOA mass yield of OA + organic nitrate aerosol of 13–15% (with ∼50 μg m–3 inorganic seed aerosol and 2–5 μg m–3 total organic aerosol). Isoprene (5–25 ppb) and oxidant (typically ∼100 ppb O3 and 5–25 ppb NO2) concentrations and aerosol composition (inorganic and organic coating) were varied while remaining close to ambient conditions, producing similar AN and SOA yields under all regimes. We observe the formation of dinitrates upon oxidation of the second double bond only once the isoprene precursor is fully consumed. We determine the bulk partitioning coefficient for ANs (Kp ∼ 10–3 m3 μg–1), indicating an average volatility corresponding to a C5 hydroxy hydroperoxy nitrate.

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Contributing Institute(s):

1. Troposphäre (IEK-8)

Research Program(s):

1. 211 - Die Atmosphäre im globalen Wandel (POF4-211) (POF4-211)

Appears in the scientific report 2021

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Database coverage:
; ; ; Clarivate Analytics Master Journal List ; Current Contents - Physical, Chemical and Earth Sciences ; Essential Science Indicators ; IF < 5 ; JCR ; SCOPUS ; Science Citation Index Expanded ; Web of Science Core Collection

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