Abstract
Polycentric urban structures are widely regarded as solutions to mitigating urban heat islands (UHI). However, few studies clarified the influences of morphological and functional polycentrism on UHI. Using Chongqing as the case study, we revealed the spatial pattern of UHI based on ECOSTRESS images and morphological/functional polycentrism based on multi-source data. Then, we quantified the spatial and nonlinear effects of polycentric structures on UHI using spatial regressions and XGBoost-SHAP methods. The results showed that polycentric structures exhibit spillover and nonlinear effects on local heat variation. Building volume alleviated UHI in the urban core, signifying a substantial shadowing effect in a mountainous setting. Population density positively but weakly affected local UHI among urban centers. Facility mixture positively affected UHI mainly in facility-abundant subcenters within the effective range between 0.5 and 1.0. As a functional factor, functional linkages exerted positive effects mainly in the urban cores where the degree centrality is larger than 1,500 while exhibiting negative correlation in the peripheral subcenters, suggesting the cooling effects by dispersing functions in the urban core. These findings help mitigate UHI by targeting measures for optimizing polycentric structures.
Sign-in/Register to access full text options 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
