Influence of Three-Dimensional Urban Morphology on Winter Aerosol Patterns in High-Density Mountainous City:A Case Study of Chongqing's Central Urban Area
Urban atmospheric quality is a critical control factor for the overall urban environmental quality,and decoupling the constraint relationship between urban spatial morphology and atmospheric environmental quality is fundamental for constructing high-quality urban development strategies.This study,based on multi-source spatial data,such as long-term MODIS and high-resolution vector buildings,retrieves aerosol optical depth(AOD)in the central urban area of Chongqing from 2020 to 2022 using the dark target method to quantify urban atmospheric environmental quality.A set of ten quantitative indicators representing urban morphology was developed from three-dimensions-planar,three-dimensional,functional,and a geographic detector was applied to analyze the independent and interactive constraints of each factor on winter aerosols.The results showed that:1)around the whole central urban area,the spatial heterogeneity of winter aerosols is significant,and some factors,including urban surface elevation,vegetation coverage,sky view of factors,and land use type,have global binding performance for AOD,while other factors,such as building density and building volume rate,have local binding performance for AOD.2)Within the urban built-up area,the main factors influencing the spatial pattern of AOD were urban surface elevation(q=0.574),vegetation coverage(q=0.524),land use(q=0.506),and road network distance(q=0.352).Other urban morphological factors exhibited relatively weak explanatory powers,with similar contribution values(approximately q=0.29).3)Within the urban built-up area,the explanatory factors exhibit significant combined constraint effects,and their combined explanatory power[q(Xi∩Xj)]is stronger than the independent effects,with q values ranging from 0.29‒0.65.This study provides a scientific basis for clarifying the relationship between urban morphology and air quality,and offers significant theoretical and practical insights for urban planning and environmental management.
high-density mountainous citywinter aerosolconstraintsgeographic detectorChongqing's central urban area
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