Hunan Key Laboratory of Remote Sensing of Ecological Environment in Dongting Lake Area, School of Geography and Information Engineering, China University of Geosciences, Wuhan 430074, China; Hubei Key Laboratory of Critical Zone Evolution, School of Geography and Information Engineering, China University of Geosciences, Wuhan 430074, China.
Hunan Key Laboratory of Remote Sensing of Ecological Environment in Dongting Lake Area, School of Geography and Information Engineering, China University of Geosciences, Wuhan 430074, China; Hubei Key Laboratory of Critical Zone Evolution, School of Geography and Information Engineering, China University of Geosciences, Wuhan 430074, China.
Sci Total Environ. 2020 Aug 20;731:138857. doi: 10.1016/j.scitotenv.2020.138857. Epub 2020 May 5.
In this study, the long-term trends and spatial characteristics of heat waves (HW) were analyzed using observations at a dense network of 2000 meteorological stations in China during 1961-2014. The contribution of urbanization to HW was quantitatively evaluated at the national scale based on a method of dynamically classifying urban and rural stations. The results based on different HW measures showed that HW in China became increasingly frequent, intense and longer, and emerged earlier and terminated later. More significant variation trends of HW were observed in southern and northern China, whereas relatively weaker and negative trends occurred in the Jianghuai-Plain region. The effect of urbanization on HW was evaluated in eight subregions of China, the results showed that the urbanization had an notable impact on the progression of HW. The urbanization contribution was pronounced in all subregions, especially in the southwestern, northern and southern China, where contributions were found to be >45%. In northwestern China, a negative urbanization effect was found in some HW measures, which was inferred to be related to the local dry climate. Overall, the contribution of urbanization to HW reached 30-50% for the urban areas of China. This study provided great insights in understanding the variations in extreme weather events and their relationships with urbanization.
本研究利用中国 2000 个气象站的密集观测资料，分析了 1961-2014 年期间热浪（HW）的长期变化趋势和空间特征。基于动态区分城乡站的方法，定量评估了城市化对全国范围内 HW 的贡献。基于不同 HW 指标的结果表明，中国的 HW 变得更加频繁、强烈和持久，出现得更早，结束得更晚。中国南方和北方的 HW 变化趋势更为显著，而江淮平原地区的变化趋势则相对较弱且为负。在中国的八个次区域评估了城市化对 HW 的影响，结果表明城市化对 HW 的发展有显著影响。城市化的影响在所有次区域都很显著，特别是在中国西南部、北部和南部，其贡献超过 45%。在中国西北部，一些 HW 指标中发现了城市化的负效应，这被推断与当地干旱的气候有关。总体而言，城市化对中国城市地区 HW 的贡献达到了 30-50%。本研究为理解极端天气事件的变化及其与城市化的关系提供了重要的见解。
