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Urban heat islands cause higher temperatures that persist longer than in rural areas, especially in cities with heat-retaining materials. This research highlights urban temperature persistence and informs mitigation strategies.

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Area of Science:

  • Environmental Science
  • Climate Science
  • Urban Planning

Background:

  • Urban areas experience higher temperatures than rural surroundings, known as the urban heat island (UHI) effect.
  • The persistence of elevated urban temperatures during heat waves is critical for human health but remains understudied.

Purpose of the Study:

  • To investigate the persistence of urban surface and near-surface air temperatures compared to rural temperatures.
  • To assess the impact of urban materials on temperature persistence over heat wave timescales.

Main Methods:

  • Utilized numerical simulations from a global climate model.
  • Applied surface energy balance theory to analyze temperature dynamics.
  • Compared temperature persistence in urban versus rural environments.

Main Results:

  • Urban surface and near-surface air temperatures exhibit significantly greater persistence than rural temperatures.
  • Cities dominated by impervious materials with high thermal inertia show stronger temperature persistence.
  • Increased use of such materials is projected to intensify urban temperature persistence, particularly in tropical regions.

Conclusions:

  • Urban heat island effect includes not only higher temperatures but also prolonged temperature persistence.
  • Impervious materials significantly contribute to the enhanced persistence of urban heat.
  • Findings provide a basis for developing mitigation strategies to reduce both the magnitude and persistence of urban heat.