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.
| Original language | English |
|---|---|
| Article number | e2021GL097366 |
| Journal | Geophysical Research Letters |
| Volume | 49 |
| Issue number | 11 |
| DOIs | |
| State | Published - Jun 16 2022 |
| Externally published | Yes |
Funding
The authors acknowledge SAPHIR team of the Institute for Energy and Climate (IEK-8), Forschungszentrum Jülich for their support and technical help during the isoprene + NO3 experiments at the SAPHIR chamber, the team of the NO3Isop, JULIAC, Hong Kong, Changping, Amazon, SOAS and Gothenburg campaigns. This research has been supported by the European Research Council (ERC) (SARLEP grant agreement no. 681529), European Commission (EC) under the European Union's Horizon 2020 research and innovation program (Eurochamp 2020 grant agreement no. 730997 and FORCeS grant agreement no. 821205), Vetenskapsrådet (VR, Grant Nos. 2014–05332 and 2018–04430), and Svenska Forskningsrådet Formas (Grant Nos. 2015–1537 and 2019–586). A. Mayhew acknowledges the Natural Environment Research Council for a PhD studentship as part of the PANORAMA DTP. T. Wang is supported by the Hong Kong Research Grants Council (project no. A-PolyU502/16), and he thanks the Hong Kong Environmental Protection for providing access to its air monitoring site. The Amazon deployment was supported by the FAPESP-University of Manchester SPRINT initiative. The authors acknowledge SAPHIR team of the Institute for Energy and Climate (IEK‐8), Forschungszentrum Jülich for their support and technical help during the isoprene + NO experiments at the SAPHIR chamber, the team of the NO3Isop, JULIAC, Hong Kong, Changping, Amazon, SOAS and Gothenburg campaigns. This research has been supported by the European Research Council (ERC) (SARLEP grant agreement no. 681529), European Commission (EC) under the European Union's Horizon 2020 research and innovation program (Eurochamp 2020 grant agreement no. 730997 and FORCeS grant agreement no. 821205), Vetenskapsrådet (VR, Grant Nos. 2014–05332 and 2018–04430), and Svenska Forskningsrådet Formas (Grant Nos. 2015–1537 and 2019–586). A. Mayhew acknowledges the Natural Environment Research Council for a PhD studentship as part of the PANORAMA DTP. T. Wang is supported by the Hong Kong Research Grants Council (project no. A‐PolyU502/16), and he thanks the Hong Kong Environmental Protection for providing access to its air monitoring site. The Amazon deployment was supported by the FAPESP‐University of Manchester SPRINT initiative. 3
Keywords
- VOC oxidation
- atmospheric chamber
- isoprene
- organonitrate
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