A new evaluation of the role of urbanization to warming at various spatial scales: Evidence from the Guangdong‐Hong Kong‐Macao Region, China

Liya Chao, Boyin Huang, Yang Yuanjian, Phil Jones, Jiayi Cheng, Yang Yang, Qingxiang Li

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The urbanization impacts on Surface Air Temperature (SAT) change in the Guangdong‐Hong Kong‐Macao region (GHMR) from 1979 to 2018 are examined using homogeneous surface observations, reanalysis, and remote sensing. Results show that the warming due to urbanization tends to be smaller or insignificant as the spatial scale increases. The urbanization contribution to the local warming can reach as high as 50% in the center of each metropolis, remains high (~25%) in the Greater Bay Area (GBA), and decreases to about 10% in the whole GHMR. The warming in GHMR is nearly uniform throughout the day, and therefore the observed trend of the Diurnal Temperature Range (DTR) is not statistically significant. However, the urbanization contribution exhibits distinct seasonal variations, large in summer and autumn while smaller in winter and spring.
Original languageEnglish
Article numbere2020GL089152
JournalGeophysical Research Letters
Issue number20
Early online date28 Sep 2020
Publication statusPublished - 28 Oct 2020


  • temperature
  • the Greater Bay Area
  • the Guangdong-Hong Kong-Macau regions
  • uncertainty
  • urbanization
  • warming trend

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