Journal cover Journal topic
Atmospheric Chemistry and Physics An interactive open-access journal of the European Geosciences Union
Journal topic

Journal metrics

IF value: 5.414
IF 5-year value: 5.958
IF 5-year
CiteScore value: 9.7
SNIP value: 1.517
IPP value: 5.61
SJR value: 2.601
Scimago H <br class='widget-line-break'>index value: 191
Scimago H
h5-index value: 89
Volume 9, issue 4
Atmos. Chem. Phys., 9, 1431–1449, 2009
© Author(s) 2009. This work is distributed under
the Creative Commons Attribution 3.0 License.
Atmos. Chem. Phys., 9, 1431–1449, 2009
© Author(s) 2009. This work is distributed under
the Creative Commons Attribution 3.0 License.

  23 Feb 2009

23 Feb 2009

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

J. L. Fry1, A. Kiendler-Scharr2, A. W. Rollins1, P. J. Wooldridge1, S. S. Brown3, H. Fuchs3, W. Dubé3, A. Mensah2, M. dal Maso2, R. Tillmann2, H.-P. Dorn2, T. Brauers2, and R. C. Cohen1 J. L. Fry et al.
  • 1Department of Chemistry, University of California, Berkeley, CA, USA
  • 2ICG-2: Troposphäre, Forschungszentrum Jülich, 52425 Jülich, Germany
  • 3Chemical Sciences Division, NOAA Earth System Research Laboratory, Boulder, CO, USA

Abstract. The yields of organic nitrates and of secondary organic aerosol (SOA) particle formation were measured for the reaction NO3+β-pinene under dry and humid conditions in the atmosphere simulation chamber SAPHIR at Research Center Jülich. These experiments were conducted at low concentrations of NO3 (NO3+N2O5<10 ppb) and β-pinene (peak~15 ppb), with no seed aerosol. SOA formation was observed to be prompt and substantial (~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 pvap~5×10−6 Torr (6.67×10−4 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+β-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.

Publications Copernicus
Final-revised paper