气候变化领域集成服务门户(CCPortal): Large-eddy simulation of traffic-related air pollution at a very high resolution in a mega-city: Evaluation against mobile sensors and insights for influencing factors

CCPortal

DOI	10.5194/acp-21-2917-2021
	Large-eddy simulation of traffic-related air pollution at a very high resolution in a mega-city: Evaluation against mobile sensors and insights for influencing factors
	Zhang Y.; Ye X.; Wang S.; He X.; Dong L.; Zhang N.; Wang H.; Wang Z.; Ma Y.; Wang L.; Chi X.; Ding A.; Yao M.; Li Y.; Li Q.; Zhang L.; Xiao Y.
发表日期	2021
ISSN	1680-7316
起始页码	2917
结束页码	2929
卷号	21 期号:4
英文摘要	Urban air pollution has tremendous spatial variability at scales ranging from kilometers to meters due to unevenly distributed emission sources, complex flow patterns, and photochemical reactions. However, high-resolution air quality information is not available through traditional approaches such as ground-based measurements and regional air quality models (with typical resolution > 1 km). Here we develop a 10 m resolution air quality model for trafficrelated CO pollution based on the Parallelized Large-Eddy Simulation Model (PALM). The model performance is evaluated with measurements obtained from sensors deployed on a taxi platform, which collects data with a comparable spatial resolution to our model. The very high resolution of the model reveals a detailed geographical dispersion pattern of air pollution in and out of the road network. The model results (0.92 ± 0.40 mg m-3 ) agree well with the measurements (0.90 ± 0.58 mg m-3 , n=114 502). The model has similar spatial patterns to those of the measurements, and the r2 value of a linear regression between model and measurement data is 0.50 ± 0.07 during non-rush hours with middle and low wind speeds. A non-linear relationship is found between average modeled concentrations and wind speed with higher concentrations under calm wind speeds. The modeled concentrations are also 20 %-30 % higher in streets that align with the wind direction within ∼ 20°. We find that streets with higher buildings downwind have lower modeled concentrations at the pedestrian level, and similar effects are found for the variability in building heights (including gaps between buildings). The modeled concentrations also decay fast in the first ∼ 50 m from the nearest highway and arterial road but change slower further away. This study demonstrates the potential of large-eddy simulation in urban air quality modeling, which is a vigorous part of the smart city system and could inform urban planning and air quality management. © Author(s) 2021. This work is distributed under the Creative Commons Attribution 4.0 License.
语种	英语
scopus关键词	atmospheric pollution; concentration (composition); image resolution; large eddy simulation; megacity; sensor; traffic emission; urban area
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/247110
作者单位	School of Atmospheric Sciences, Nanjing University, Nanjing, China; School of Environment, Nanjing University, Nanjing, China; Beijing SPC Environment Protection Tech Company Ltd., Beijing, China; Hebei Saihero Environmental Protection Hi-Tech. Company Ltd, Shijiazhuang, Hebei, China
推荐引用方式 GB/T 7714	Zhang Y.,Ye X.,Wang S.,et al. Large-eddy simulation of traffic-related air pollution at a very high resolution in a mega-city: Evaluation against mobile sensors and insights for influencing factors[J],2021,21(4).
APA	Zhang Y..,Ye X..,Wang S..,He X..,Dong L..,...&Xiao Y..(2021).Large-eddy simulation of traffic-related air pollution at a very high resolution in a mega-city: Evaluation against mobile sensors and insights for influencing factors.ATMOSPHERIC CHEMISTRY AND PHYSICS,21(4).
MLA	Zhang Y.,et al."Large-eddy simulation of traffic-related air pollution at a very high resolution in a mega-city: Evaluation against mobile sensors and insights for influencing factors".ATMOSPHERIC CHEMISTRY AND PHYSICS 21.4(2021).