Production and Fate of Alkyl Nitrates During KORUS-AQ
Abstract
Alkyl nitrates (ΣANs = ΣRONO2) are oxidative sinks of NOx, thereby affecting NOx lifetime and O3 production, and can contribute to secondary organic aerosol (SOA) production. Here we explore both the production and fate of ΣANs during KORUS-AQ, an aircraft-based campaign over the Korean peninsula during May-June 2016. We find evidence for significant nighttime production of ΣANs via NO3-initiated oxidation, in addition to the typical daytime OH-initiated production. Moreover, we explore the phase partitioning fate of ΣANs to better understand the contribution of ΣANs to secondary organic aerosol production. We observe that the fraction of ΣANs in the condensed phase increases with total organic aerosol (OA) concentration, evidence that equilibrium absorptive partitioning controls the phase distribution of ΣANs. We use these observations to constrain the vapor pressure distribution of observed ΣANs.
- Publication:
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AGU Fall Meeting Abstracts
- Pub Date:
- December 2019
- Bibcode:
- 2019AGUFM.U14C..09K
- Keywords:
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- 0810 Post-secondary education;
- EDUCATION;
- 0815 Informal education;
- EDUCATION