@article{2fb554b8130d4c74b6bcc4a1df945ace,
title = "A Four Carbon Organonitrate as a Significant Product of Secondary Isoprene Chemistry",
abstract = "Abstract Oxidation of isoprene by nitrate radicals (NO3) or by hydroxyl radicals (OH) under high NOx conditions forms a substantial amount of organonitrates (ONs). ONs impact NOx concentrations and consequently ozone formation while also contributing to secondary organic aerosol. Here we show that the ONs with the chemical formula C4H7NO5 are a significant fraction of isoprene-derived ONs, based on chamber experiments and ambient measurements from different sites around the globe. From chamber experiments we found that C4H7NO5 isomers contribute 5%?17% of all measured ONs formed during nighttime and constitute more than 40% of the measured ONs after further daytime oxidation. In ambient measurements C4H7NO5 isomers usually dominate both nighttime and daytime, implying a long residence time compared to C5 ONs which are removed more rapidly. We propose potential nighttime sources and secondary formation pathways, and test them using a box model with an updated isoprene oxidation scheme.",
keywords = "organonitrate, isoprene, VOC oxidation, atmospheric chamber",
author = "Epameinondas Tsiligiannis and Rongrong Wu and Lee, {Ben H.} and Salvador, {Christian Mark} and Michael Priestley and Carlsson, {Philip T. M.} and Sungah Kang and Anna Novelli and Luc Vereecken and Hendrik Fuchs and Mayhew, {Alfred W.} and Hamilton, {Jacqueline F.} and Edwards, {Peter M.} and Fry, {Juliane L.} and Bellamy Brownwood and Brown, {Steven S.} and Wild, {Robert J.} and Bannan, {Thomas J.} and Hugh Coe and James Allan and Surratt, {Jason D.} and Asan Bacak and Paul Artaxo and Carl Percival and Song Guo and Min Hu and Tao Wang and Mentel, {Thomas F.} and Thornton, {Joel A.} and Mattias Hallquist",
year = "2022",
month = jun,
day = "16",
doi = "10.1029/2021GL097366",
language = "English",
volume = "49",
journal = "Geophysical Research Letters",
issn = "0094-8276",
publisher = "American Geophysical Union",
number = "11",
}