title: Linking potential heat source and sink to urban heat island: Heterogeneous effects of landscape pattern on land surface temperature.
abstract: Rapid urbanization has significantly contributed to the development of urban heat island (UHI). Regulating landscape composition and configuration would help mitigate the UHI in megacities. Taking Shenzhen, China, as a case study area, we defined heat source and heat sink and identified strong and weak sources as well as strong and weak sinks according to the natural and socioeconomic factors influencing land surface temperature (LST). Thus, the potential thermal contributions of heat source and heat sink patches were differentiated. Then, the heterogeneous effects of landscape pattern on LST were examined by using semiparametric geographically weighted regression (SGWR) models. The results showed that landscape composition has more significant effects on thermal environment than configuration. For a strong source, the percentage of patches has a positive impact on LST. Additionally, when mosaicked with some heat sink, even a small improvement in the degree of dispersion of a strong source helps to alleviate UHI. For a weak source, the percentage and density of patches have positive impacts on LST. For a strong sink, the percentage, density, and degree of aggregation of patches have negative impacts on LST. The effects of edge density and patch shape complexity vary spatially with the fragmentation of a strong sink. Similarly, the impacts of a weak sink are mainly exerted via the characteristics of percent, density, and shape complexity of patches.
authors.affiliation: Department of Urban Planning and Design, Faculty of Architecture, The University of Hong Kong, Hong Kong, China; Shenzhen Institute of Research and Innovation, The University of Hong Kong, Shenzhen 518057, China.
authors.forename: Weifeng
authors.initials: W
authors.lastname: Li
authors.affiliation: Key Laboratory for Urban Habitat Environmental Science and Technology, School of Urban Planning and Design, Peking University, Shenzhen 518055, China; School of Architecture, Tsinghua University, Beijing 100871, China.
authors.forename: Qiwen
authors.initials: Q
authors.lastname: Cao
authors.affiliation: Key Laboratory for Urban Habitat Environmental Science and Technology, School of Urban Planning and Design, Peking University, Shenzhen 518055, China.
authors.forename: Kun
authors.initials: K
authors.lastname: Lang
authors.affiliation: Key Laboratory for Urban Habitat Environmental Science and Technology, School of Urban Planning and Design, Peking University, Shenzhen 518055, China; Laboratory for Earth Surface Processes, Ministry of Education, College of Urban and Environmental Sciences, Peking University, Beijing 100871, China. Electronic address: wujs@pkusz.edu.cn.
authors.forename: Jiansheng
authors.initials: J
authors.lastname: Wu
keywords: Land surface temperature; SGWR model; Source·Sink·Heterogeneity; Urban heat island