Organic nitrate aerosol formation via NO 3 + biogenic volatile organic compounds in the southeastern United States

Content Provider	Semantic Scholar
Author	Ayres, Benjamin E. Allen, Hannah M. Draper, Danielle C. Brown, Steven S. Wild, R. J. Jiménez, José Luis Day, Douglas A. Campuzano-Jost, Pedro Hu, Weiwei Gouw, Joost A. De Koss, Abigail R. Cohen, Ronald C. Duffey, Kaitlin C. Romer, Paul S. Baumann, Karen Edgerton, Ellen Takahama, Satoshi Thornton, Joel A. Lopez-Hilfiker, Felipe D. Mohr, Claudia Wennberg, Paul O. Nguyen, Tran B. Teng, Alex P. Goldstein, Allen H. Olson, Kent D. Fry, Juliane L.
Copyright Year	2015
Abstract	Gas- and aerosol-phase measurements of oxidants, biogenic volatile organic compounds (BVOCs) and organic nitrates made during the Southern Oxidant and Aerosol Study (SOAS campaign, Summer 2013) in central Alabama show that a nitrate radical (NO_3) reaction with monoterpenes leads to significant secondary aerosol formation. Cumulative losses of NO_3 to terpenes are correlated with increase in gas- and aerosol-organic nitrate concentrations made during the campaign. Correlation of NO_3 radical consumption to organic nitrate aerosol formation as measured by aerosol mass spectrometry and thermal dissociation laser-induced fluorescence suggests a molar yield of aerosol-phase monoterpene nitrates of 23–44 %. Compounds observed via chemical ionization mass spectrometry (CIMS) are correlated to predicted nitrate loss to BVOCs and show C_(10)H_(17)NO_5, likely a hydroperoxy nitrate, is a major nitrate-oxidized terpene product being incorporated into aerosols. The comparable isoprene product C_5H_9NO_5 was observed to contribute less than 1 % of the total organic nitrate in the aerosol phase and correlations show that it is principally a gas-phase product from nitrate oxidation of isoprene. Organic nitrates comprise between 30 and 45 % of the NOy budget during SOAS. Inorganic nitrates were also monitored and showed that during incidents of increased coarse-mode mineral dust, HNO_3 uptake produced nitrate aerosol mass loading at a rate comparable to that of organic nitrate produced via NO_3 + BVOCs.
Starting Page	13377
Ending Page	13392
Page Count	16
File Format	PDF HTM / HTML
DOI	10.5194/acp-15-13377-2015
Volume Number	15
Alternate Webpage(s)	https://nature.berkeley.edu/ahg/pubs/Ayers_etal_acp-2015.pdf
Alternate Webpage(s)	http://authors.library.caltech.edu/63701/1/acp-15-13377-2015.pdf
Alternate Webpage(s)	https://doi.org/10.5194/acp-15-13377-2015
Language	English
Access Restriction	Open
Content Type	Text
Resource Type	Article