References

ACP

Atmospheric Chemistry and Physics

ACP

Atmos. Chem. Phys.

1680-7324

Copernicus Publications

Göttingen, Germany

10.5194/acp-14-1423-2014

Secondary organic aerosol yields of 12-carbon alkanes

Loza

C. L.

¹ Craven

J. S.

¹ Yee

L. D.

https://orcid.org/0000-0001-8965-9319

² Coggon

M. M.

¹ Schwantes

R. H.

² Shiraiwa

https://orcid.org/0000-0003-2532-5373

¹ ³ Zhang

² Schilling

K. A.

¹ Ng

N. L.

https://orcid.org/0000-0001-8460-4765

⁴ Canagaratna

M. R.

⁵ Ziemann

P. J.

https://orcid.org/0000-0001-7419-0044

⁶ Flagan

R. C.

https://orcid.org/0000-0001-5690-770X

¹ ² Seinfeld

J. H.

https://orcid.org/0000-0003-1344-4068

¹ ²

Division of Chemistry and Chemical Engineering, California Institute of Technology, Pasadena, CA, USA

Division of Engineering and Applied Science, California Institute of Technology, Pasadena, CA, USA

Multiphase Chemistry Department, Max Planck Institute for Chemistry, Mainz, Germany

School of Chemical and Biomolecular Engineering and School of Earth and Atmospheric Sciences, Georgia Institute of Technology, Atlanta, GA, USA

Aerodyne Research, Inc., Billerica, MA, USA

Air Pollution Research Center, Department of Environmental Sciences, and Environmental Toxicology Graduate Program, University of California, Riverside, CA, USA

07 02 2014

14 3 1423 1439

2014

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Secondary organic aerosol (SOA) yields were measured for cyclododecane, hexylcyclohexane, n-dodecane, and 2-methylundecane under high-NOx conditions, in which alkyl proxy radicals (RO2) react primarily with NO, and under low-NOx conditions, in which RO2 reacts primarily with HO2. Experiments were run until 95–100% of the initial alkane had reacted. Particle wall loss was evaluated as two limiting cases using a new approach that requires only suspended particle number-size distribution data and accounts for size-dependent particle wall losses and condensation. SOA yield differed by a factor of 2 between the two limiting cases, but the same trends among alkane precursors were observed for both limiting cases. Vapor-phase wall losses were addressed through a modeling study and increased SOA yield uncertainty by approximately 30%. SOA yields were highest from cyclododecane under both NOx conditions. SOA yields ranged from 3.3% (dodecane, low-NOx conditions) to 160% (cyclododecane, high-NOx conditions). Under high-NOx conditions, SOA yields increased from 2-methylundecane < dodecane ~ hexylcyclohexane < cyclododecane, consistent with previous studies. Under low-NOx conditions, SOA yields increased from 2-methylundecane ~ dodecane < hexylcyclohexane < cyclododecane. The presence of cyclization in the parent alkane structure increased SOA yields, whereas the presence of branch points decreased SOA yields due to increased vapor-phase fragmentation. Vapor-phase fragmentation was found to be more prevalent under high-NOx conditions than under low-NOx conditions. For different initial mixing ratios of the same alkane and same NOx conditions, SOA yield did not correlate with SOA mass throughout SOA growth, suggesting kinetically limited SOA growth for these systems.

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