Intensified urban heat island effects, but not a result of urban warming revealed by time-series land surface temperature trend analysis

Authors: Jia Wang*, , Weiqi Zhou, Research Center for Eco-Environmental Sciences, Chinese Academy of Siences
Topics: Urban and Regional Planning, Land Use and Land Cover Change, Geography and Urban Health
Keywords: urban heat island intensity; LST trend; deteriorated urban thermal environment; Spatial-temporal dynamics; Urban ecology; Beijing;
Session Type: Paper
Day: 4/6/2019
Start / End Time: 5:00 PM / 6:40 PM
Room: Marshall South, Marriott, Mezzanine Level
Presentation File: No File Uploaded

Previous studies largely investigated the rising of UHII to analyze the intensification of UHI effect along the rapid urbanization. However, few studies have distinguished the different changes of temperature in urban and non-urban areas, revealed the spatial heterogeneity of urban temperature trend and its drivers. Taking Beijing as an example, we distinguished the process of UHII increased, detected the dynamics of LST and their potential effects in Beijing. Results showed that: 1) Increased UHII mainly caused by the cooling in NoUA, where urban green activities implemented, not the warming in UA; 2) The distribution of the TrendLST was heterogeneous spatially. A large proportion of zone (15.28%) having a significant warming in UA and mainly distributed in NUA. In contrast, most of the non-urban areas had a trend in cooling, with 15.96% was significant; 3) EVI and NDBI can significantly negatively and positively affected LST, but with various relative importance by zones and years; 4) Trend of EVI and NDBI can also significantly negatively and positively affected LST trend. However, TrendEVI had a weak positive relationship with TrendLST (P=0.023) when EVI increased significantly. Suggesting that the gain of trees could lower LST significantly. But if more quick, LST could not decrease more quick as we expected. This study underscores the importance of time-series trend analysis on UHI analysis to reveal the practical change of UHII caused by different rate of LST changing in urban and non-urban areas, and also enhanced our understanding of evidence and drivers of intensified UHI effect.

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