| Title | The mediating effect of air pollution in the impacts of urban form on nighttime urban heat island intensity |
| Authors | Liang, Ze Huang, Jiao Wang, Yueyao Wei, Feili Wu, Shuyao Jiang, Hong Zhang, Xuliang Li, Shuangcheng |
| Affiliation | Peking Univ, Coll Urban & Environm Sci, Beijing 100871, Peoples R China Peking Univ, Key Lab Earth Surface Proc Minist Educ, Beijing 100871, Peoples R China Peking Univ, Shenzhen Grad Sch, Sch Urban Planning & Design, Shenzhen 518055, Peoples R China Boston Univ, Sch Theol, Boston, MA 02215 USA |
| Keywords | LAND-USE SURFACE QUALITY CITIES CHINA COMPACT CLIMATE EXPANSION NO2 URBANIZATION |
| Issue Date | Nov-2021 |
| Publisher | SUSTAINABLE CITIES AND SOCIETY |
| Abstract | Urban form studies on urban heat island (UHI) are mostly from the microscale perspective of thermodynamics or fluid mechanics, lacking of consideration of the impact of urban form on traffic behavior or air pollution, which is also proved to be influential on nighttime urban thermal environment. The objective of this paper is to quantitatively reveal the mediating role of air pollution in the impacts of urban form on nighttime UHI intensity based upon an empirical research of 150 cities of China. We constructed multivariate regression models, structural equation models and scenario simulations to verify and predict the mediating effect of air pollution. Results showed that the fractal dimension of urban planar shape almost all influences UHI intensity through air pollution. The mediating effect related to urban continuity and urban elongation also accounts for 25-28 % and 33-40 % of the total effect, respectively. Controlling urban population density can play an important role on UHI mitigation, but optimization of urban geometry can bring co-benefits on urban air and thermal environments. For the purpose of improving urban thermal environment, we advocate the proper elongation and decentralization of urban form, and control urban sprawl disorderly, especially in cities with severe air pollution. |
| URI | http://hdl.handle.net/20.500.11897/626513 |
| ISSN | 2210-6707 |
| DOI | 10.1016/j.scs.2021.102985 |
| Indexed | EI SCI(E) SSCI |
| Appears in Collections: | 城市与环境学院 地表过程分析与模拟教育部重点实验室 深圳研究生院待认领 |
