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<p>The cities of Cuiabá and Várzea Grande are among the main urban agglomerations in central-western Brazil. Characterized by complex urban morphologies, diverse residential typologies, and heterogeneous land cover, they rank among the hottest regions in the country. Diurnal and nocturnal climate differences during hot periods are particularly relevant for guiding climate-responsive housing design and urban planning strategies. This study evaluated urban heat islands (UHIs) and urban cool islands (UCIs) on an hourly basis during hot-humid and hot-dry months, using the framework of Local Climate Zones (LCZs). Air temperature data were collected from fixed meteorological stations located in three urban zones and one rural reference zone. Temperature differences (<i>ΔT</i>) between urban and rural areas were used to quantify warming (positive <i>ΔT</i>, UHI) and cooling (negative <i>ΔT</i>, UCI) effects. In highly built-up zones, the UHI effect persisted for 17 to 24 h per day, while in areas with lower building density and more vegetation, it was limited to 4–8 h. During daytime, the urban zone with approximately 70% vegetation and water bodies, particularly near the Cuiabá River, recorded UCI values as low as − 8&#xa0;°C. In contrast, zones dominated by waterproof surfaces and bare land reached UHI intensities near + 2&#xa0;°C in both climate periods. These findings underscore the critical role of land use, vegetation, and blue-green infrastructure in shaping thermal conditions in the built environment and provide evidence to support spatial planning and housing strategies for enhanced thermal comfort and climate resilience in tropical cities.</p>

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Urban heat and cool island dynamics in a rapidly growing tropical city: land-use implications for the built environment of Cuiabá, Brazil

  • 期刊论文

  • 发表日期：

    2025年12月26日

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  • Natallia Sanches e Souza,
  • Marta Cristina de Jesus Albuquerque Nogueira,
  • Flávia Maria de Moura Santos,
  • Luciana Sanches

摘要

The cities of Cuiabá and Várzea Grande are among the main urban agglomerations in central-western Brazil. Characterized by complex urban morphologies, diverse residential typologies, and heterogeneous land cover, they rank among the hottest regions in the country. Diurnal and nocturnal climate differences during hot periods are particularly relevant for guiding climate-responsive housing design and urban planning strategies. This study evaluated urban heat islands (UHIs) and urban cool islands (UCIs) on an hourly basis during hot-humid and hot-dry months, using the framework of Local Climate Zones (LCZs). Air temperature data were collected from fixed meteorological stations located in three urban zones and one rural reference zone. Temperature differences (ΔT) between urban and rural areas were used to quantify warming (positive ΔT, UHI) and cooling (negative ΔT, UCI) effects. In highly built-up zones, the UHI effect persisted for 17 to 24 h per day, while in areas with lower building density and more vegetation, it was limited to 4–8 h. During daytime, the urban zone with approximately 70% vegetation and water bodies, particularly near the Cuiabá River, recorded UCI values as low as − 8 °C. In contrast, zones dominated by waterproof surfaces and bare land reached UHI intensities near + 2 °C in both climate periods. These findings underscore the critical role of land use, vegetation, and blue-green infrastructure in shaping thermal conditions in the built environment and provide evidence to support spatial planning and housing strategies for enhanced thermal comfort and climate resilience in tropical cities.