Extreme heat events in cities are becoming more intense, frequent and prolonged. The spatiotemporal dynamics of surface temperature are closely related to land cover and atmospheric conditions, especially for urban areas with extensive surface heterogeneity. Two high spatial resolution satellites, ECOSTRESS and Landsat, provide land surface temperature (LST) for a typical Mediterranean climate city, Valencia, Spain. In total of 17 images throughout two heatwaves in the period of July and August from 2022 to 2023 were selected to monitor LST and surface urban heat island (SUHI). The Local Climate Zone (LCZ) scheme and hotspot analysis were applied to analyze the patterns of LST and SUHI during and after the heatwaves. Daytime images show LCZ 2/3/6/8 and LCZ C/E/F exhibit elevated SUHI intensity, meanwhile the LCZ 4, A/B and G have lower SUHI. The SUHI intensity of compact buildings (LCZ 1/2/3), LCZ 8/E/G are significantly higher at night, especially on heatwave days, the SUHI of all types increased by 0.1–0.9 °C. Furthermore, the meteorological parameters were introduced trying to explain the obvious diurnal difference of SUHI during heatwaves. This research serves as a proxy for understanding the spatiotemporal dynamics of SUHI during heatwave events, offering valuable insights for city planners and policymakers to enhance thermal comfortable level and effectively cope with extreme weather.

中文翻译：

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使用 ECOSTRESS 和 Landsat 数据基于当地气候带的地表城市热岛分析：以巴伦西亚市（西班牙）为例


城市极端高温事件变得更加强烈、频繁和持续。地表温度的时空动态与土地覆盖和大气条件密切相关，特别是对于地表广泛异质性的城市地区。 ECOSTRESS 和 Landsat 两颗高空间分辨率卫星为典型的地中海气候城市西班牙巴伦西亚提供地表温度 (LST)。选取 2022 年至 2023 年 7 月和 8 月两次热浪期间的 17 个图像来监测地表温度和地表城市热岛（SUHI）。应用局地气候带（LCZ）方案和热点分析来分析热浪期间和之后的LST和SUHI模式。白天图像显示 LCZ 2/3/6/8 和 LCZ C/E/F 显示出较高的 SUHI 强度，同时 LCZ 4、A/B 和 G 的 SUHI 较低。紧凑型建筑（LCZ 1/2/3）、LCZ 8/E/G的SUHI强度在夜间显着较高，特别是在热浪天，所有类型的SUHI增加了0.1-0.9°C。此外，引入气象参数试图解释热浪期间SUHI明显的日变化。这项研究可以作为了解热浪事件期间SUHI时空动态的代理，为城市规划者和政策制定者提高热舒适水平并有效应对极端天气提供宝贵的见解。