Organic nitrate and secondary organic aerosol yield from NO3 oxidation of ß-pinene evaluated using a gas-phase kinetics/aerosol partitioning model

Fry, J.L.; Rollins, A.W.; Fuchs, H.; Brown, S.S.; Cohen, R.C.; Brauers, T.; Tillmann, R.; Kiendler-Scharr, A.; Dube, W.; Dal Maso, M.; Mensah, A.; Wooldridge, P.J.; Dorn, H.-P.

Journal Article

Organic nitrate and secondary organic aerosol yield from NO3 oxidation of ß-pinene evaluated using a gas-phase kinetics/aerosol partitioning model

Fry, J. L. ; Kiendler-Scharr, A.FZJ* ; Rollins, A. W. ; Wooldridge, P. J. ; Brown, S. S. ; Fuchs, H.FZJ* ; Dube, W. ; Mensah, A.FZJ* ; Dal Maso, M.FZJ* ; Tillmann, R.FZJ* ; Dorn, H.-P.FZJ* ; Brauers, T.FZJ* ; Cohen, R. C.

2009
EGU Katlenburg-Lindau

Atmospheric chemistry and physics 9, 1431 - 1449 (2009)

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Please use a persistent id in citations: http://hdl.handle.net/2128/10167

Abstract: The yields of organic nitrates and of secondary organic aerosol (SOA) particle formation were measured for the reaction NO3+beta-pinene under dry and humid conditions in the atmosphere simulation chamber SAPHIR at Research Center Julich. These experiments were conducted at low concentrations of NO3 (NO3+N2O5 < 10 ppb) and beta-pinene (peak similar to 15 ppb), with no seed aerosol. SOA formation was observed to be prompt and substantial (similar to 50% mass yield under both dry conditions and at 60% RH), and highly correlated with organic nitrate formation. The observed gas/aerosol partitioning of organic nitrates can be simulated using an absorptive partitioning model to derive an estimated vapor pressure of the condensing nitrate species of p(vap) similar to 5x10(-6) Torr (6.67x10(-4) Pa), which constrains speculation about the oxidation mechanism and chemical identity of the organic nitrate. Once formed the SOA in this system continues to evolve, resulting in measurable aerosol volume decrease with time. The observations of high aerosol yield from NOx-dependent oxidation of monoterpenes provide an example of a significant anthropogenic source of SOA from biogenic hydrocarbon precursors. Estimates of the NO3+beta-pinene SOA source strength for California and the globe indicate that NO3 reactions with monoterpenes are likely an important source (0.5-8% of the global total) of organic aerosol on regional and global scales.

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Meteorology & Atmospheric Sciences

Note: The Berkeley authors were supported by NSF ATM-0639847 and NSF ATM-0511829. The authors thank Luke Valin for assistance running WRF/Chem; Klaus Scott for providing California monoterpene emissions estimates; Steve Ball and Bill Simpson for helpful comments on the manuscript; and the entire SAPHIR NO<INF>3</INF> intercomparison campaign team, June 2007 at Forschungszentrum Julich, for their support of these experiments. This work was a joint activity of the European Network of Excellence ACCENT ( contract no: GOCE CT-2004-505337) and EUROCHAMP.

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