Affected air movement, artificial heat production, increased solar absorption and suppressed vegetation cause significant temperature differences between urban and suburban/rural regions, forming Surface Urban Heat Islands (SUHI). Here, we propose a methodological framework combining daytime and nighttime Landsat 8 data with comprehensive statistical evaluation based on the retrieved information. To quantify SUHI, we selected a pair of daytime and nighttime Landsat 8 scenes, calculated the Urban Thermal Field Variance Index and applied a comprehensive statistical approach to assess differences in SUHI behaviour across Local Climate Zones and between day and night, examining its relationships with albedo, elevation, land surface emissivity and vegetation cover. Open urban typologies were characterised by milder day temperatures, especially over open areas with higher buildings, while compact low-rise areas presented the highest SUHI intensity. Higher buildings presented more intense SUHI at night, with milder temperatures over open and low-rise regions. These results confirm the SUHI dynamics and its strong association with the urban structure and the presence of vegetation. The proposed complex methodological framework can be, with minor adjustments, applied to other regions as well, which can improve the comparability among studies on SUHI and promote our understanding of its causes and possible mitigation measures.

中文翻译：

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评估当地气候带的白天和夜间地表城市热岛——巴西弗洛里亚诺波利斯的案例研究

受影响的空气流动、人工产热、太阳能吸收增加和植被抑制导致城市和郊区/农村地区之间出现显着的温差，形成表面城市热岛（SUHI）。在这里，我们提出了一个方法框架，将白天和夜间的 Landsat 8 数据与基于检索信息的综合统计评估相结合。为了量化 SUHI，我们选择了一对白天和夜间的 Landsat 8 场景，计算了城市热场方差指数，并应用综合统计方法来评估不同当地气候带以及白天和夜间之间 SUHI 行为的差异，检查其与反照率的关系、海拔、地表发射率和植被覆盖。开放城市类型的特点是白天温度较温和，尤其是在建筑物较高的开放区域，而紧凑的低层区域呈现最高的 SUHI 强度。较高的建筑物在夜间呈现出更强烈的 SUHI，而空旷和低层区域的气温则较温和。这些结果证实了 SUHI 动态及其与城市结构和植被存在的密切关联。所提出的复杂方法框架经过细微调整也可以应用于其他地区，这可以提高SUHI研究之间的可比性，并促进我们对其原因和可能的缓解措施的理解。