Preprints
https://doi.org/10.5194/acp-2021-515
https://doi.org/10.5194/acp-2021-515

  13 Sep 2021

13 Sep 2021

Review status: this preprint is currently under review for the journal ACP.

Technical note: Dispersion of cooking-generated aerosols from an urban street canyon

Shang Gao1, Mona Kurppa2, Chak K. Chan1, and Keith Ngan1 Shang Gao et al.
  • 1School of Energy and Environment, City University of Hong Kong, Kowloon, Tat Chee Avenue, Hong Kong
  • 2Atmospheric Composition Research, Finnish Meteorological Institute, Helsinki, Finland

Abstract. The dispersion of cooking-generated aerosols from an urban street canyon is examined with building-resolving computational fluid dynamics (CFD). Using a comprehensive urban CFD model (PALM) with a sectional aerosol module (SALSA), emissions from deep frying and boiling are considered for near-ground and elevated sources. It is found that, with representative choices of the source flux, the inclusion of aerosol dynamic processes decreases the mean canyon-averaged number concentration by 15–40 % for cooking emissions, whereas the effect is significantly weaker for traffic-generated aerosols. The effects of deposition and coagulation are comparable for boiling, but coagulation dominates for deep frying. Deposition is maximised inside the leeward corner vortices, while coagulation increases away from the source. The characteristic timescales are invoked to explain the spatial structure of deposition and coagulation. In particular, the relative difference between number concentrations for simulations with and without coagulation are strongly correlated with the ageing of particles along fluid trajectories or the mean tracer age.

Shang Gao et al.

Status: open (until 25 Oct 2021)

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Shang Gao et al.

Shang Gao et al.

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Short summary
The contribution of cooking emissions to organic aerosols may exceed that of motor vehicles. However, little is known about how cooking-generated aerosols evolve in the outdoor environment. In this paper, we present a numerical study of the dispersion of cooking emissions. For plausible choices of the emission strength, cooking can yield much higher concentrations than traffic. This has important implications for public health and city planning.
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