Key Role of NO3Radicals in the Production of Isoprene Nitrates and Nitrooxyorganosulfates in Beijing

Hamilton, J.F. and Bryant, D.J. and Edwards, P.M. and Ouyang, B. and Bannan, T.J. and Mehra, A. and Mayhew, A.W. and Hopkins, J.R. and Dunmore, R.E. and Squires, F.A. and Lee, J.D. and Newland, M.J. and Worrall, S.D. and Bacak, A. and Coe, H. and Whalley, L.K. and Heard, D.E. and Slater, E.J. and Jones, R.L. and Cui, T. and Surratt, J.D. and Reeves, C.E. and Mills, G.P. and Grimmond, S. and Sun, Y. and Xu, W. and Shi, Z. and Rickard, A.R. (2021) Key Role of NO3Radicals in the Production of Isoprene Nitrates and Nitrooxyorganosulfates in Beijing. Environmental Science and Technology, 55 (2). pp. 842-853. ISSN 0013-936X

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The formation of isoprene nitrates (IsN) can lead to significant secondary organic aerosol (SOA) production and they can act as reservoirs of atmospheric nitrogen oxides. In this work, we estimate the rate of production of IsN from the reactions of isoprene with OH and NO3 radicals during the summertime in Beijing. While OH dominates the loss of isoprene during the day, NO3 plays an increasingly important role in the production of IsN from the early afternoon onwards. Unusually low NO concentrations during the afternoon resulted in NO3 mixing ratios of ca. 2 pptv at approximately 15:00, which we estimate to account for around a third of the total IsN production in the gas phase. Heterogeneous uptake of IsN produces nitrooxyorganosulfates (NOS). Two mono-nitrated NOS were correlated with particulate sulfate concentrations and appear to be formed from sequential NO3 and OH oxidation. Di- and tri-nitrated isoprene-related NOS, formed from multiple NO3 oxidation steps, peaked during the night. This work highlights that NO3 chemistry can play a key role in driving biogenic-anthropogenic interactive chemistry in Beijing with respect to the formation of IsN during both the day and night.

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Journal Article
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Environmental Science and Technology
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10 Dec 2021 17:46
Last Modified:
22 Nov 2022 09:56