Articles | Volume 17, issue 21
https://doi.org/10.5194/acp-17-13037-2017
https://doi.org/10.5194/acp-17-13037-2017
Research article
 | 
06 Nov 2017
Research article |  | 06 Nov 2017

Mixing times of organic molecules within secondary organic aerosol particles: a global planetary boundary layer perspective

Adrian M. Maclean, Christopher L. Butenhoff, James W. Grayson, Kelley Barsanti, Jose L. Jimenez, and Allan K. Bertram

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Subject: Aerosols | Research Activity: Atmospheric Modelling and Data Analysis | Altitude Range: Troposphere | Science Focus: Physics (physical properties and processes)
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Cited articles

Abramson, E., Imre, D., Beranek, J., Wilson, J., and Zelenyuk, A.: Experimental determination of chemical diffusion within secondary organic aerosol particles, Phys. Chem. Chem. Phys., 15, 2983–2991, https://doi.org/10.1039/C2CP44013J, 2013.
Bateman, A. P., Bertram, A. K., and Martin, S. T.: Hygroscopic influence on the semisolid-to-liquid transition of secondary organic materials, J. Phys. Chem. A, 119, 4386–4395, https://doi.org/10.1021/jp508521c, 2015.
Champion, D., Hervet, H., Blond, G., LeMeste, M., and Simatos, D.: Translational diffusion in sucrose solutions in the vicinity of their glass transition temperature, J. Phys. Chem. B, 101, 10674–10679, https://doi.org/10.1021/jp971899i, 1997.
Chen, X. and Hopke, P. K.: Secondary organic aerosol from α-pinene ozonolysis in dynamic chamber system, Indoor Air, 19, 335–345, https://doi.org/10.1111/j.1600-0668.2009.00596.x, 2009.
Chenyakin, Y., Ullmann, D. A., Evoy, E., Renbaum-Wolff, L., Kamal, S., and Bertram, A. K.: Diffusion coefficients of organic molecules in sucrose–water solutions and comparison with Stokes–Einstein predictions, Atmos. Chem. Phys., 17, 2423–2435, https://doi.org/10.5194/acp-17-2423-2017, 2017.
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Using laboratory data, meteorological fields and a chemical transport model, we investigated how often mixing times are < 1 h within SOA in the planetary boundary layer (PBL). Based on viscosity data for alpha-pinene SOA generated using mass concentrations of ~1000 µg m −3, mixing times in biogenic SOA are < 1h most of the time.
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