Future changes in population exposure to intensified heatwaves over three major urban agglomerations in China based on excess heat factor  

作　　者：Qin-Yao ZHOU Miao-Ni GAO Jing YANG Xin-Yue SUN Yan-Yu LU Tong JIANG Bu-Da SU Tao ZHU 

机构地区：[1]Institute for Disaster Risk Management,School of Geographical Sciences,Nanjing University of Information Science and Technology,Nanjing 210044,China [2]Faculty of Geographical Science,Beijing Normal University,Beijing 100875,China [3]Anhui Institute of Meteorological Sciences,Hefei 230031,China [4]Institute of Atmospheric Physics,Chinese Academy of Sciences,Beijing 100029,China

出　　处：《Advances in Climate Change Research》2025年第1期12-24,共13页气候变化研究进展(英文版)

基　　金：supported by the National Natural Science Foundation of China(42105158,U2342208,42475022).

摘　　要：Heatwave events(HWs)have become more frequent and intense due to climate change and urbanization,posing risks to human health,yet the influence of rapid temperature fluctuation on human adaptation during these events remains insufficiently explored.This study identified HWs and estimated population exposure across three major urban agglomerations in eastern China based on the Excess Heat Factor(EHF),which accounts for the superposed effect of extreme heat and human adaptability in response to rapid temperature fluctuations.From 1961 to 2022,the BeijingeTianjineHebei(BTH)region and GuangdongeHong KongeMacao Greater Bay Area(GBA)suffered from moderate HWs with higher frequency and shorter duration,while HWs in the Yangtze River Delta(YRD)region were characterized by lower frequency and longer duration.Compared to EHF,the conventional approach that uses single temperature criteria to identify HWs tends to underestimate their intensity without accounting for the effects of sudden temperature rises on human adaptability.Based on the downscaled ensemble of 23 models from the Coupled Model Intercomparison Project Phase 6(CMIP6),HWs and population exposure are expected to increase across the three urban agglomerations in the near-term(2025-2035)and mid-term(2055-2065)future,with GBA experiencing the greatest rise in HW days.However,YRD will have the highest population exposure due to its large population.During the projected explosive growth of severe/extreme HW days,low and intermediate GHG emission scenarios(SSP1-2.6,SSP2-4.5)could potentially avoid 29%/45%,28%/42%and 44%/96%of the increase in population exposure to these events across the BTH,YRD,and GBA,respectively,in the mid-term future,compared to high GHG emission scenarios(SSP3-7.0,SSP5-8.5).Further analysis reveals that the expected increase in HWs in GBA and BTH is attributable to the combined effect of intensified temperature variability and warming,while the changes in HWs in YRD are primarily driven by rising temperatures.The results emphasize the urgent ne

关 键 词：Heatwaves Population exposure Excess heat factor NEX-GDDP-CMIP6 Urban agglomerations 

分 类 号：P467[天文地球—大气科学及气象学]