Characterizing the Hourly Variation of Urban Heat Islands in a Snowy Climate City during Summer

Chaobin Yang, Ranghu Wang, Shuwen Zhang, Caoxiang Ji and Xie Fu
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Chaobin Yang: School of Civil and Architectural Engineering, Shandong University of Technology, Zibo 255000, China
Ranghu Wang: Institute of Loess Plateau, Shanxi University, Taiyuan 030006, China
Shuwen Zhang: Northeast Institute of Geography and Agroecology, Chinese Academy of Sciences, Changchun 130102, China
Caoxiang Ji: Shenyang Meteorological Bureau, Shenyang 110168, China
Xie Fu: School of Architecture and Urban Planning, Suzhou University of Science and Technology, Suzhou 215009, China

IJERPH, 2019, vol. 16, issue 14, 1-19

Abstract: Temporal variation of urban heat island (UHI) intensity is one of the most important themes in UHI studies. However, fine-scale temporal variability of UHI with explicit spatial information is sparse in the literature. Based on the hourly air temperature from 195 meteorological stations during August 2015 in Changchun, China, hourly spatiotemporal patterns of UHI were mapped to explore the temporal variability and the effects of land use on the thermal environment using time series analysis, air temperature profiling, and spatial analysis. The results showed that: (1) high air temperature does not indicate strong UHI intensity. The nighttime UHI intensity (1.51 °C) was much stronger than that in the daytime (0.49 °C). (2) The urban area was the hottest during most of the day except the period from late morning to around 13:00 when there was about a 40% possibility for an “inverse UHI intensity” to appear. Paddy land was the coolest in the daytime, while woodland had the lowest temperature during the nighttime. (3) The rural area had higher warming and cooling rates than the urban area after sunrise and sunset. It appeared that 23 °C was the threshold at which the thermal characteristics of different land use types changed significantly.

Keywords: hourly; air temperature; urban heat island intensity; land use; temporal variability (search for similar items in EconPapers)
JEL-codes: I I1 I3 Q Q5 (search for similar items in EconPapers)
Date: 2019
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