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The yields of organic nitrates and of secondary organic aerosol (SOA)particle formation were measured for the reaction NO3+β-pinene underdry and humid conditions in the atmosphere simulation chamber SAPHIR atResearch Center Jülich. These experiments were conducted at lowconcentrations of NO3 (NO3+N2O5<10 ppb) andβ-pinene (peak~15 ppb), with no seed aerosol. SOA formation wasobserved to be prompt and substantial (~50% mass yield under bothdry conditions and at 60% RH), and highly correlated with organic nitrateformation. The observed gas/aerosol partitioning of organic nitrates can besimulated using an absorptive partitioning model to derive an estimatedvapor pressure of the condensing nitrate species of pvap~5×10−6 Torr(6.67×10−4 Pa), which constrainsspeculation about the oxidation mechanism and chemical identity of theorganic nitrate. Once formed the SOA in this system continues to evolve,resulting in measurable aerosol volume decrease with time. The observationsof high aerosol yield from NOx-dependent oxidation of monoterpenesprovide an example of a significant anthropogenic source of SOA from biogenic hydrocarbonprecursors. Estimates of the NO3+β-pinene SOA source strength forCalifornia and the globe indicate that NO3 reactions with monoterpenesare likely an important source (0.5–8% of the global total) of organicaerosol on regional and global scales

atmospheric chemistry and physics

Organic nitrate and secondary organic aerosol yield from NO&amp;lt;sub&amp;gt;3&amp;lt;/sub&amp;gt; oxidation of β-pinene evaluated using a gas-phase kinetics/aerosol partitioning model