气候变化领域集成服务门户(CCPortal): Radiative effects and chemical compositions of fine particles modulating urban heat island in Nanjing, China

CCPortal

DOI	10.1016/j.atmosenv.2021.118201
	Radiative effects and chemical compositions of fine particles modulating urban heat island in Nanjing, China
	Wu H.; Wang T.; Wang Q.; Cao Y.; Qu Y.; Nie D.
发表日期	2021
ISSN	1352-2310
卷号	247
英文摘要	Particulate matter with aerodynamic diameters no greater than 2.5 μm (PM2.5) affects solar radiation through direct and indirect means, and the effects vary with different compositions. The heterogeneous distributions of the concentration and compositions of PM2.5 between the urban centre and the suburban areas lead to changes in the urban heat island (UHI) intensity. This study investigated the direct and indirect effects of PM2.5 and the impact of scattering and absorption by PM2.5 on UHI intensity in Nanjing, China, using numerical modelling. The results showed that both the direct and indirect effects of PM2.5 reduced the UHI intensity (approximately between 0.04 K and 0.07 K) during the daytime and strengthened it during the night-time (approximately between 0.05 K and 0.08 K). Furthermore, scattering and absorbing compositions have a comparable impact on UHI where the concentration of scattering compositions is nine times the concentration of the absorbing compositions. They both decreased UHI intensity during the daytime (up to approximately 0.1 K) and increased it during the night-time (up to approximately 0.12 K). The existence of absorbing compositions of PM2.5 and their high concentrations may have worked in tandem to mask the UHI phenomenon and other problems encountered in urban development in the last few decades. © 2021 Elsevier Ltd
关键词	Chemical compositions PM2.5 Radiative forcing effects UHI intensities
语种	英语
scopus关键词	Atmospheric temperature; Urban growth; Aerodynamic diameters; Chemical compositions; Heterogeneous distributions; Particulate Matter; Radiative effects; Scattering and absorption; Urban development; Urban heat island; Radiation effects; boundary layer; chemical composition; concentration (composition); heat island; particulate matter; solar radiation; spatiotemporal analysis; suburban area; urban development; article; China; heat; night; particulate matter 2.5; radiative forcing; Nanjing [Jiangsu]
来源期刊	ATMOSPHERIC ENVIRONMENT
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/248615
作者单位	School of the Environment, Nanjing University210023, China; School of Atmospheric Sciences, Nanjing University210023, China; Jiangsu Urban Planning and Design Institute, Nanjing, 210024, China
推荐引用方式 GB/T 7714	Wu H.,Wang T.,Wang Q.,et al. Radiative effects and chemical compositions of fine particles modulating urban heat island in Nanjing, China[J],2021,247.
APA	Wu H.,Wang T.,Wang Q.,Cao Y.,Qu Y.,&Nie D..(2021).Radiative effects and chemical compositions of fine particles modulating urban heat island in Nanjing, China.ATMOSPHERIC ENVIRONMENT,247.
MLA	Wu H.,et al."Radiative effects and chemical compositions of fine particles modulating urban heat island in Nanjing, China".ATMOSPHERIC ENVIRONMENT 247(2021).