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| Authors |
Ben H Lee Claudia Mohr Felipe D Lopez-Hilfiker Anna Lutz Mattias Hallquist Lance Lee Paul Romer Ronald C Cohen Siddharth Iyer Theo Kurtén Weiwei Hu Douglas A Day Pedro Campuzano-Jost Jose L Jimenez Lu Xu Nga Lee Ng Hongyu Guo Rodney J Weber Robert J Wild Steven S Brown Abigail Koss Joost de Gouw Kevin Olson Allen H Goldstein Roger Seco Saewung Kim Kevin McAvey Paul B Shepson Tim Starn Karsten Baumann Eric S Edgerton Jiumeng Liu John E Shilling David O Miller William Brune Siegfried Schobesberger Emma L D'Ambro Joel A Thornton |
|---|---|
| Published in | Proceedings of the National Academy of Sciences of the United States of America |
| Volume | 113 |
| Issue | 6 |
| Pages | 1516-21 |
| ISSN | 1091-6490 |
| Publication year | 2016 |
| Published at |
Department of Chemistry and Molecular Biology |
| Pages | 1516-21 |
| Language | en |
| Links |
dx.doi.org/10.1073/pnas.1508108113 |
| Subject categories | Analytical Chemistry, Organic Chemistry, Climate Research, Environmental chemistry, Meteorology and Atmospheric Sciences |
Speciated particle-phase organic nitrates (pONs) were quantified using online chemical ionization MS during June and July of 2013 in rural Alabama as part of the Southern Oxidant and Aerosol Study. A large fraction of pONs is highly functionalized, possessing between six and eight oxygen atoms within each carbon number group, and is not the common first generation alkyl nitrates previously reported. Using calibrations for isoprene hydroxynitrates and the measured molecular compositions, we estimate that pONs account for 3% and 8% of total submicrometer organic aerosol mass, on average, during the day and night, respectively. Each of the isoprene- and monoterpenes-derived groups exhibited a strong diel trend consistent with the emission patterns of likely biogenic hydrocarbon precursors. An observationally constrained diel box model can replicate the observed pON assuming that pONs (i) are produced in the gas phase and rapidly establish gas-particle equilibrium and (ii) have a short particle-phase lifetime (∼2-4 h). Such dynamic behavior has significant implications for the production and phase partitioning of pONs, organic aerosol mass, and reactive nitrogen speciation in a forested environment.
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