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  Evolution of NO3 reactivity during the oxidation of isoprene

Dewald, P., Liebmann, J. M., Friedrich, N., Shenolikar, J., Schuladen, J., Rohrer, F., et al. (2020). Evolution of NO3 reactivity during the oxidation of isoprene. Atmospheric Chemistry and Physics, 20(17), 10459-10475. doi:10.5194/acp-20-10459-2020.

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Dewald, Patrick1, Autor           
Liebmann, Jonathan M.1, Autor           
Friedrich, Nils1, Autor           
Shenolikar, Justin1, Autor           
Schuladen, Jan1, Autor           
Rohrer, Franz2, Autor
Reimer, David2, Autor
Tillmann, Ralf2, Autor
Novelli, Anna2, Autor
Cho, Changmin2, Autor
Xu, Kangming2, Autor
Holzinger, Rupert2, Autor
Bernard, Francois2, Autor
Zhou, Li2, Autor
Mellouki, Wahid2, Autor
Brown, Steven S.2, Autor
Fuchs, Hendrik2, Autor
Lelieveld, Jos1, Autor           
Crowley, John N.1, Autor           
Affiliations:
1Atmospheric Chemistry, Max Planck Institute for Chemistry, Max Planck Society, ou_1826285              
2external, ou_persistent22              

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 Zusammenfassung: In a series of experiments in an atmospheric simulation chamber (SAPHIR,1 Forschungszentrum Jülich, Germany), NO3 reactivity (kNO3) resulting from the reaction of NO3 with isoprene and stable trace gases formed as products was measured directly using a flow tube reactor coupled to a cavity ring-down spectrometer (FT-CRDS). The experiments were carried out in both dry and humid air with variation of the initial mixing ratios of ozone (50–100 ppbv), isoprene (3–22 ppbv) and NO2 (5–30 ppbv). kNO3 was in excellent agreement with values calculated from the isoprene mixing ratio and the rate coefficient for the reaction of NO3 with isoprene. This result serves to confirm that the FT-CRDS returns accurate values of kNO3 even at elevated NO2 concentrations and to show that reactions of NO3 with stable reaction products like non-radical organic nitrates do not contribute significantly to NO3 reactivity during the oxidation of isoprene. A comparison of kNO3 with NO3 reactivities calculated from NO3 mixing ratios and NO3 production rates suggests that organic peroxy radicals and HO2 account for ∼50 % of NO3 losses. This contradicts predictions based on numerical simulations using the Master Chemical Mechanism (MCM version 3.3.1) unless the rate coefficient for reaction between NO3 and isoprene-derived RO2 is roughly doubled to ∼5×10−12 cm3 molecule−1 s−1.

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Sprache(n): eng - English
 Datum: 2020-09-08
 Publikationsstatus: Erschienen
 Seiten: -
 Ort, Verlag, Ausgabe: -
 Inhaltsverzeichnis: -
 Art der Begutachtung: -
 Identifikatoren: ISI: 000569419500001
DOI: 10.5194/acp-20-10459-2020
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Titel: Atmospheric Chemistry and Physics
  Kurztitel : ACP
Genre der Quelle: Zeitschrift
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Affiliations:
Ort, Verlag, Ausgabe: Göttingen : Copernicus Publications
Seiten: - Band / Heft: 20 (17) Artikelnummer: - Start- / Endseite: 10459 - 10475 Identifikator: ISSN: 1680-7316
CoNE: https://pure.mpg.de/cone/journals/resource/111030403014016