Exploring coupling effect between urban heat island effect and PM2.5 concentrations from the perspective of spatial environment

Abstract

The coupling effect between urban PM 2.5 concentrations and urban heat island effect has been paid more and more attention to. Previous studies mostly focused on the analysis of data correlations, lacking the interpretation of the formation texture. Taking Hefei as the subject, this study combined the spatial statistical model with the coupling coordination degree model to explore the influence of spatial environment-related indicators on the coupling effect of cities. In addition, at the micro level, the paper used grid unit to verify the relevance and made a comprehensive analysis on the formation texture of coupling effect. The results indicated that: (1) there is a significant coupling effect between the urban heat island intensity and PM 2.5 concentrations in the main urban area of Hefei with significant spatial heterogeneity. (2) to some extent, the indicators of urban spatial environment, including vegetated areas, buildings, residential land, commercial land, industrial land, building density, floor area ratio, building form ratio, the densities of road junctions and sub-arterial roads, have different effects on the coupling effect. In general, the higher the degree of human activity, the higher the degree of coupling effect. (3) the coupling effect may be influenced by a variety of spatial environment factors.

The Impact of Architectural Layout on Urban Heat Island Effect: A Thermodynamic Perspective

“…However, existing research methods have certain flaws and deficiencies. Traditional studies often focus on the statistical analysis of macro-climatic data, overlooking the dynamic changes in thermodynamic parameters at the urban microscale [9][10][11][12][13][14][15]. Moreover, the lack of in-depth discussion on the response mechanism of the UHI effect under different architectural layout scenarios makes it difficult for research findings to be directly applied in urban planning practices [16][17][18][19][20][21][22].…”