Shen Pengke, Zhao Shuqing
National Climate Center, China Meteorological Administration, Beijing 100081, China.
College of Ecology and the Environment, Hainan University, Haikou 570228, China.
iScience. 2024 Feb 5;27(3):109110. doi: 10.1016/j.isci.2024.109110. eCollection 2024 Mar 15.
Increasing urbanization exacerbates surface energy balance perturbations and the health risks of climate warming; however, it has not been determined whether urban-induced warming and attributions vary from local, regional, to global scale. Here, the local surface urban heat island (SUHI) is evidenced to manifest with an annual daily mean intensity of 0.99°C-1.10°C during 2003-2018 using satellite observations over 536 cities worldwide. Spatiotemporal patterns and mechanisms of SUHI tightly link with climate-vegetation conditions, with regional warming effect reaching up to 0.015°C-0.138°C (annual average) due to surface energy alterations. Globally, the SUHI footprint of 1,860 cities approximates to 1% of the terrestrial lands, about 1.8-2.9 times far beyond the urban impervious areas, suggesting the enlargements of the imprint of urban warming from local to global scales. With continuous development of urbanization, the implications for SUHI-added warming and scaling effects are considerably important on accelerating global warming.
城市化进程的加快加剧了地表能量平衡的扰动以及气候变暖带来的健康风险；然而，城市引起的变暖及其归因在地方、区域和全球尺度上是否存在差异尚未确定。在此，利用全球536个城市的卫星观测数据证明，2003年至2018年期间，当地地表城市热岛（SUHI）的年日均强度为0.99°C至1.10°C。SUHI的时空模式和机制与气候-植被条件紧密相关，由于地表能量变化，区域变暖效应高达0.015°C至0.138°C（年平均值）。在全球范围内，1860个城市的SUHI足迹约占陆地面积的1%，比城市不透水面积大1.8至2.9倍，这表明城市变暖的影响范围从地方尺度扩大到了全球尺度。随着城市化的持续发展，SUHI额外增温及其尺度效应对于加速全球变暖具有相当重要的意义。
