气候变化领域集成服务门户(CCPortal): Technical note: Dispersion of cooking-generated aerosols from an urban street canyon

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DOI	10.5194/acp-22-2703-2022
	Technical note: Dispersion of cooking-generated aerosols from an urban street canyon
	Gao, Shang; Kurppa, Mona; Chan, Chak K.; Ngan, Keith
发表日期	2022
ISSN	1680-7316
EISSN	1680-7324
起始页码	2703
结束页码	2726
卷号	22 期号:4 页码:24
英文摘要	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. 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 is strongly correlated with the ageing of particles along fluid trajectories or the mean tracer age. It is argued that, for a specific emission spectrum, the qualitative nature of the aerosol dynamics within urban canopies is determined by the ratio of the aerosol timescales to the relevant dynamical timescale (e.g. the mean age of air).
学科领域	Environmental Sciences; Meteorology & Atmospheric Sciences
语种	英语
WOS研究方向	Environmental Sciences & Ecology ; Meteorology & Atmospheric Sciences
WOS记录号	WOS:000765672100001
来源期刊	ATMOSPHERIC CHEMISTRY AND PHYSICS
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/273590
作者单位	City University of Hong Kong; Finnish Meteorological Institute
推荐引用方式 GB/T 7714	Gao, Shang,Kurppa, Mona,Chan, Chak K.,et al. Technical note: Dispersion of cooking-generated aerosols from an urban street canyon[J],2022,22(4):24.
APA	Gao, Shang,Kurppa, Mona,Chan, Chak K.,&Ngan, Keith.(2022).Technical note: Dispersion of cooking-generated aerosols from an urban street canyon.ATMOSPHERIC CHEMISTRY AND PHYSICS,22(4),24.
MLA	Gao, Shang,et al."Technical note: Dispersion of cooking-generated aerosols from an urban street canyon".ATMOSPHERIC CHEMISTRY AND PHYSICS 22.4(2022):24.