Differences in the evolution of urban and rural surface thermal environment and their responses to urban renewal in Shanghai, China.

The rapid and extensive urbanization has profound impacts on urban thermal environment. It is of great significance to comprehensively understand how urbanization affects the evolution of urban thermal environment for urban ecological safety, environmental quality, and residents' health. Based on daily land surface temperature (LST) products of MODIS Aqua satellite in the summer of 2002-2020, we investigated the evolution of urban-rural differences in surface summer thermal environment in Shanghai during 2002-2020 and its response to urban spatial renewal. We used normalized land surface temperature (NLST) and urban heat island ratio index (URI) as the surface thermal environment measurement indicators, by combining vegetation index and impervious surface cove-rage, and used M-K trend analysis and interpretation analysis. The results showed that the linear growth rate of LST in Shanghai was 0.09 ℃·a 快速而广泛的城市化过程对城市热环境产生了深刻影响,全面了解城市化进程如何影响城市热环境演变及其趋势差异对于城市生态安全、环境质量及居民健康等具有重要意义。本研究基于MODIS Aqua卫星2002—2020年夏季逐日白天地表温度产品,结合遥感植被指数和不透水面覆盖信息,使用归一化地表温度和热岛比例系数作为地表热环境衡量指标,利用M-K趋势检验和解释度分析,探究上海市城市化进程中夏季地表热环境演变趋势的城乡差异及其对城市空间更新的响应。结果表明: 2002—2020年,上海市地表温度线性增长率为0.09 ℃·a