气候变化领域集成服务门户(CCPortal): Effects of urbanization on regional meteorology and air quality in Southern California

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DOI	10.5194/acp-19-4439-2019
	Effects of urbanization on regional meteorology and air quality in Southern California
	Li Y.; Zhang J.; Sailor D.J.; Ban-Weiss G.A.
发表日期	2019
ISSN	16807316
起始页码	4439
结束页码	4457
卷号	19 期号:7
英文摘要	Urbanization has a profound influence on regional meteorology and air quality in megapolitan Southern California. The influence of urbanization on meteorology is driven by changes in land surface physical properties and land surface processes. These changes in meteorology in turn influence air quality by changing temperature-dependent chemical reactions and emissions, gas-particle phase partitioning, and ventilation of pollutants. In this study we characterize the influence of land surface changes via historical urbanization from before human settlement to the present day on meteorology and air quality in Southern California using the Weather Research and Forecasting Model coupled to chemistry and the single-layer urban canopy model (WRF-UCM-Chem). We assume identical anthropogenic emissions for the simulations carried out and thus focus on the effect of changes in land surface physical properties and land surface processes on air quality. Historical urbanization has led to daytime air temperature decreases of up to 1.4 K and evening temperature increases of up to 1.7 K. Ventilation of air in the LA basin has decreased up to 36.6 % during daytime and increased up to 27.0 % during nighttime. These changes in meteorology are mainly attributable to higher evaporative fluxes and thermal inertia of soil from irrigation and increased surface roughness and thermal inertia from buildings. Changes in ventilation drive changes in hourly NOx concentrations with increases of up to 2.7 ppb during daytime and decreases of up to 4.7 ppb at night. Hourly O3 concentrations decrease by up to 0.94 ppb in the morning and increase by up to 5.6 ppb at other times of day. Changes in O3 concentrations are driven by the competing effects of changes in ventilation and precursor NOx concentrations. PM2.5 concentrations show slight increases during the day and decreases of up to 2.5 μg m-3 at night. Process drivers for changes in PM2.5 include modifications to atmospheric ventilation and temperature, which impact gas-particle phase partitioning for semi-volatile compounds and chemical reactions. Understanding process drivers related to how land surface changes effect regional meteorology and air quality is crucial for decision-making on urban planning in megapolitan Southern California to achieve regional climate adaptation and air quality improvements. © Author(s) 2019.
语种	英语
scopus关键词	air quality; anthropogenic source; concentration (composition); forecasting method; land surface; megacity; nitrogen oxides; particulate matter; regional climate; urbanization; California; United States
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/144512
作者单位	Department of Civil and Environmental Engineering, University of Southern California, Los Angeles, 90089, United States; School of Geographical Science and Urban Planning, Arizona State University, Tempe, 85281, United States
推荐引用方式 GB/T 7714	Li Y.,Zhang J.,Sailor D.J.,et al. Effects of urbanization on regional meteorology and air quality in Southern California[J],2019,19(7).
APA	Li Y.,Zhang J.,Sailor D.J.,&Ban-Weiss G.A..(2019).Effects of urbanization on regional meteorology and air quality in Southern California.Atmospheric Chemistry and Physics,19(7).
MLA	Li Y.,et al."Effects of urbanization on regional meteorology and air quality in Southern California".Atmospheric Chemistry and Physics 19.7(2019).