Spatiotemporal Characteristics of Urban Heat Islets and Its Correlation with Urban Green Space:A Case Study of Central Nanjing
Under the context of global climate change,the urban heat island effect has become one of the grant challenges in urban area.However,there are few studies on the spatiotemporal heterogeneity of the inner composition and distribution of heat islands.This study takes the thermal environment of the main urban area of Nanjing in 2017 and 2022 as examples,divides the heat islands into multiple independent heat islets,identifies different types of spatiotemporal variation,and explores the correlation of urban green space with heat islets heterogeneity.The results show that fragmentation and mergence are the 2 main types of spatiotemporal variation of heat islets,and the urban heat islands intensity of heat islets will decrease obviously after fragmentation,while the merged islets have the opposite trend.There is a significant correlation between the changes of heat islets and urban green space.Assuming that all else being equal,when green space increases by 1.00hm2,the mean area of heat islet will decrease by 14.25hm2,and the number of heat islets will increase by 1.86 on average.On the contrary,for every 1.00hm2 reduction in green space,an average of 1.51 heat islets will merge together,and the mean area of heat islets will also increase by 3.89hm2.It indicates that targeted green space planning and layout according to the characteristics of different heat islets could efficiently reduce the urban heat island intensity.This study is expected to provide novel study and practical ideas for the mitigation of urban heat islands.
landscape architectureurban heat islandheat isletspatiotemporal changeurban green spacefragmentationmergence
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NSTL
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