Using the daily maximum temperature data and population spatial distribution data from national meteorological sta-tions in the middle and lower reaches of the Yangtze River,linear regression methods was used to analyze the spatiotemporal characteristics and trends of the frequency of occurrence,effective accumulated temperature,and duration of summer average heatwaves,intense heatwaves,and extreme heatwaves,as well as the population exposure risks under different heatwave inten-sities in the middle and lower reaches of the Yangtze River from 1961 to 2020.The results indicated that the distribution pat-terns of the frequency,accumulated effective temperature,and duration of seasonal mean heatwaves,severe heatwaves,and extreme heatwaves were relatively similar,showing a general trend of higher occurrences in the southeast and fewer in the northwest.The high-value areas were all located in the southeastern part of the middle and lower reaches of the Yangtze River.As the intensity of heat waves increased,the frequency,effective accumulated temperature,duration,and magnitude of chan-ges gradually decreased,and the range of high-value areas gradually narrowed.The distribution of trend changes followed the same pattern,with significant increases in the southeastern part of the region and significant decreases in the western part of Hubei Province and the northern parts of Anhui and Jiangsu Provinces.The high-risk range of population exposure affected by the three types of heatwaves first decreased and then expanded,with the smallest range from 1995 to 1999.The areas with higher population exposure risks under the influence of HW and SHW were still in the southeastern part of the middle and low-er reaches of the Yangtze River,while the high-risk exposure to EHW was sparsely found in the northern part of Jiangxi Prov-ince and the western part of Zhejiang Province.
关键词
高温热浪/人口暴露风险/时空变化特征/长江中下游
Key words
high-temperature heatwaves/population exposure risks/spatiotemporal variation characteristics/middle and lower reaches of the Yangtze River
维普
万方数据