Abstract
Nanjing, a typical megacity in eastern China, has undergone dramatic expansion during the past decade. The surface urban heat island (SUHI) effect is an important indicator of the environmental consequences of urbanization and has rapidly changed the dynamics of Nanjing. Accurate measurements of the effects and changes resulting from the SUHI effect may provide useful information for urban planning. Index, centroid transfer, and correlation analyses were conducted to measure the dynamics of the SUHI and elucidate the relationship between the SUHI and urban expansion in Nanjing over the past decade. Overall, the results indicated that (1) the region affected by the SUHI effect gradually expanded southward and eastward from 2000 to 2012; (2) the centroid of the SUHI moved gradually southeastward and then southward and southwestward, which is consistent with the movement of the urban centroid; (3) the trajectory of the level-3 SUHI centroid did not correspond with the urban mass or SUHI centroids during the study period and (4) the SUHI intensity and urban fractal characteristics were negatively correlated. In addition, we presented insights regarding the minimization of the SUHI effect in cities such as Nanjing, China.
Highlights
Rapid global urbanization has resulted in considerable environmental impacts
Wu et al.[18] used data from the newly launched HJ-1B satellite to monitor the urban heat island (UHI) in Wuhan, China. These studies revealed that the land surface temperature (LST) retrieved from the thematic mapper (TM) and enhanced thematic mapper plus (ETM+) images has a higher spatial resolution, which is advantageous for revealing the spatial distribution features of the UHI
4.1 Variability of the Surface Urban Heat Island Effect Intensity in Nanjing The statistics in Table 2 show the variability of the surface urban heat island (SUHI) intensity in Nanjing during 2000 to 2012
Summary
Rapid global urbanization has resulted in considerable environmental impacts. One major environmental consequence of urbanization, the urban heat island (UHI) effect, has been of concern since 1833, when Luke Howard proposed the concept of UHI based on the higher temperature in the center of London than in the suburbs.[1] An improved understanding of the relationships between UHIs and urban expansion is essential for urban ecosystem studies and urban planning and management. Wu et al.[18] used data from the newly launched HJ-1B satellite to monitor the UHI in Wuhan, China. These studies revealed that the LST retrieved from the thematic mapper (TM) and enhanced thematic mapper plus (ETM+) images has a higher spatial resolution, which is advantageous for revealing the spatial distribution features of the UHI
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