Organic nitrate aerosol formation via NO3 + biogenic volatile organic compounds in the southeastern United States
Item
Title (Dublin Core)
Organic nitrate aerosol formation via NO3 + biogenic volatile organic compounds in the southeastern United States
Description (Dublin Core)
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<sub>3</sub>) reaction with monoterpenes leads to significant secondary aerosol formation. Cumulative losses of NO<sub>3</sub> to terpenes are correlated with increase in gas- and aerosol-organic nitrate concentrations made during the campaign. Correlation of NO<sub>3</sub> 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<sub>10</sub>H<sub>17</sub>NO<sub>5</sub>, likely a hydroperoxy nitrate, is a major nitrate-oxidized terpene product being incorporated into aerosols. The comparable isoprene product C<sub>5</sub>H<sub>9</sub>NO<sub>5</sub> 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 NO<sub><I>y</I></sub> budget during SOAS. Inorganic nitrates were also monitored and showed that during incidents of increased coarse-mode mineral dust, HNO<sub>3</sub> uptake produced nitrate aerosol mass loading at a rate comparable to that of organic nitrate produced via NO<sub>3</sub> + BVOCs.
Creator (Dublin Core)
Ayres, B. R.
Allen, H. M.
Draper, D. C.
Brown, S. S.
Wild, R. J.
Jimenez, J. L.
Day, D. A.
Campuzano-Jost, P.
Hu, W.
Gouw, J.
Koss, A.
Cohen, R. C.
Duffey, K. C.
Romer, P.
Baumann, K.
Edgerton, E.
Takahama, S.
Thornton, J. A.
Lee, B. H.
Lopez-Hilfiker, F. D.
Mohr, C.
Wennberg, P. O.
Nguyen, T. B.
Teng, A.
Goldstein, A. H.
Olson, K.
Fry, J. L.
Date (Dublin Core)
2018-09-06
Type (Dublin Core)
Text
Format (Dublin Core)
application/pdf
Identifier (Dublin Core)
10.5194/acp-15-13377-2015
https://acp.copernicus.org/articles/15/13377/2015/
Source (Dublin Core)
eISSN: 1680-7324
Language (Dublin Core)
eng
