References

ACP

Atmospheric Chemistry and Physics

ACP

1680-7324

Copernicus GmbH

Göttingen, Germany

10.5194/acp-9-6685-2009

Isoprene oxidation by nitrate radical: alkyl nitrate and secondary organic aerosol yields

Rollins

A. W.

¹ Kiendler-Scharr

³ Fry

J. L.

¹ ⁵ Brauers

³ Brown

S. S.

⁴ Dorn

H.-P.

³ Dubé

W. P.

⁴ Fuchs

⁴ Mensah

³ Mentel

T. F.

³ Rohrer

³ Tillmann

³ Wegener

³ Wooldridge

P. J.

¹ Cohen

R. C.

¹ ²

Department of Chemistry; University of California Berkeley, Berkeley, CA, USA

Department of Earth and Planetary Science, University of California Berkeley, Berkeley, CA, USA

Institute of Chemistry and Dynamic of the Geosphere, Forschungszentrum Jülich, Germany

Chemical Sciences Division, NOAA Earth System Research Laboratory, Boulder, CO, USA

now at: Department of Chemistry; Reed College, Portland, OR, USA

15 09 2009

9 18 6685 6703

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Alkyl nitrates and secondary organic aerosol (SOA) produced during the oxidation of isoprene by nitrate radicals has been observed in the SAPHIR (Simulation of Atmospheric PHotochemistry In a large Reaction Chamber) chamber. A 16 h dark experiment was conducted with temperatures at 289–301 K, and maximum concentrations of 11 ppb isoprene, 62.4 ppb O3 and 31.1 ppb NOx. We find the yield of nitrates is 70±8% from the isoprene + NO3 reaction, and the yield for secondary dinitrates produced in the reaction of primary isoprene nitrates with NO3 is 40±20%. We find an effective rate constant for reaction of NO3 with the group of first generation oxidation products to be 7×10−14 molecule−1 cm3 s−1. At the low total organic aerosol concentration in the chamber (max=0.52 μg m−3) we observed a mass yield (ΔSOA mass/Δisoprene mass) of 2% for the entire 16 h experiment. However a comparison of the timing of the observed SOA production to a box model simulation of first and second generation oxidation products shows that the yield from the first generation products was <0.7% while the further oxidation of the initial products leads to a yield of 14% (defined as ΔSOA/Δisoprene2x where Δisoprene2x is the mass of isoprene which reacted twice with NO3). The SOA yield of 14% is consistent with equilibrium partitioning of highly functionalized C5 products of isoprene oxidation.

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