دورية أكاديمية
The impact of inhomogeneous emissions and topography on ozone photochemistry in the vicinity of Hong Kong Island
| العنوان: | The impact of inhomogeneous emissions and topography on ozone photochemistry in the vicinity of Hong Kong Island |
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| المؤلفون: | Y. Wang, Y.-F. Ma, D. Muñoz-Esparza, C. W. Y. Li, M. Barth, T. Wang, G. P. Brasseur |
| المصدر: | Atmospheric Chemistry and Physics, Vol 21, Pp 3531-3553 (2021) |
| بيانات النشر: | Copernicus Publications, 2021. |
| سنة النشر: | 2021 |
| المجموعة: | LCC:Physics LCC:Chemistry |
| مصطلحات موضوعية: | Physics, QC1-999, Chemistry, QD1-999 |
| الوصف: | 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 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 (LESs) in the mountainous region of 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 of 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. In the particular setting of our model, segregation reduces the ozone formation by 8 %–12 % compared to the case with complete mixing, implying that the coarse-resolution models may overestimate the surface ozone when ignoring the segregation effect. |
| نوع الوثيقة: | article |
| وصف الملف: | electronic resource |
| اللغة: | English |
| تدمد: | 1680-7316 1680-7324 |
| Relation: | https://acp.copernicus.org/articles/21/3531/2021/acp-21-3531-2021.pdf; https://doaj.org/toc/1680-7316; https://doaj.org/toc/1680-7324 |
| DOI: | 10.5194/acp-21-3531-2021 |
| URL الوصول: | https://doaj.org/article/e24384140723459aa1986460384bdad6 |
| رقم الأكسشن: | edsdoj.24384140723459aa1986460384bdad6 |
| قاعدة البيانات: | Directory of Open Access Journals |
Full Text Finder | تدمد: | 16807316 16807324 |
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| DOI: | 10.5194/acp-21-3531-2021 |