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Atmospheric Chemistry and Physics An interactive open-access journal of the European Geosciences Union
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Large-eddy simulations (LES) were performed in the mountainous region of the Hong Kong island to investigate the degree to which the rates of chemical reactions between two reactive species are reduced due to the segregation of species within the convective boundary layer. We show that the inhomogeneity in emissions plays an important role in the segregation effect. Topography also has a significant influence on the segregation locally.
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https://doi.org/10.5194/acp-2020-877
https://doi.org/10.5194/acp-2020-877

  30 Sep 2020

30 Sep 2020

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

The impact of inhomogeneous emissions and topography on ozone photochemistry in the vicinity of the Hong Kong island

Yuting Wang1,, Yong-Feng Ma2,, Domingo Muñoz-Esparza3, Cathy W. Y. Li4, Mary Barth3, Tao Wang1, and Guy P. Brasseur1,3,4 Yuting Wang et al.
  • 1Department of Civil and Environmental Engineering, the Hong Kong Polytechnic University, Hung Hom, Kowloon, Hong Kong
  • 2Department of Mechanics & Aerospace Engineering, Southern University of Science and Technology, Shenzhen, 518055, China
  • 3National Centerfor Atmospheric Research, Boulder, CO, USA
  • 4Max Planck Institute for Meteorology, 20146, Hamburg, Germany
  • These authors contributed equally to this work.

Abstract. Global and regional chemical transport models of the atmosphere are based on the assumption that chemical species are completely mixed within each model grid box. However, in reality, these species are often segregated due to localized sources and the influence of the topography. In order to investigate the degree to which the rates of chemical reactions between two reactive species are reduced due to the possible segregation of species within the convective boundary layer, we perform large-eddy simulations (LES) in the mountainous region of the Hong Kong island. We adopt a simple chemical scheme with 15 primary and secondary chemical species including ozone and its precursors. We calculate the segregation intensity due to inhomogeneity in the surface emissions of primary pollutants and due to turbulent motions related to topography. We show that the inhomogeneity in the emissions increases the segregation intensity by a factor 2–5 relative to a case in which the emissions are assumed to be uniformly distributed. Topography has an important effect on the segregation locally, but this influence is relatively limited when considering the spatial domain as a whole.

Yuting Wang et al.

 
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Yuting Wang et al.

Yuting Wang et al.

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Short summary
Large-eddy simulations (LES) were performed in the mountainous region of the Hong Kong island to investigate the degree to which the rates of chemical reactions between two reactive species are reduced due to the segregation of species within the convective boundary layer. We show that the inhomogeneity in emissions plays an important role in the segregation effect. Topography also has a significant influence on the segregation locally.
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