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<p>The frequent occurrence of compound heatwave events (CHEs) is the distinguish feature of the enhanced instability of the climate system under the context of global warming. Further exploration into the different regional characteristics of CHEs on long timescale is in urgent need. This research provides a comprehensive analysis of characteristics of spatio-temporal change of China's compound extreme heatwave events including dry heatwave events (DHEs) and moist heatwave events (MHEs) from 1955 to 2023 in summer (JJA) in 8 sub-regions of China. The results revealed that: (1) An abrupt change of summer TMAX has taken place in China in 1999 which is highly correlated with the occurrence of a series of compound heatwave events; (2) Multiple indexes demonstrated a significant increasing trend since 1999 including the annual frequency, magnitude and duration of CHEs; (3) The annual frequency, magnitude, duration of DHEs in NC, NEC, TP, ENC and WNC regions during 2000–2023 increased dramatically compared to the period 1955–1999; (4) The average of frequency, magnitude, duration of MHEs during 2000–2023 increased significantly compared to the period 1955–1999 in all 8 sub-regions especially in SC and SWC regions; (5) The indexes of DHEs and MHEs showed different changing rate before and after the abrupt change of TMAX. The results of this study can provide scientific insights into the understanding of extreme compound events and ways to improve predictions.</p>

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Characteristics of spatial and temporal variations of summer compound heat wave events in the context of abrupt change of summer maximum temperature in recent 70 years

  • 期刊论文

  • 发表日期：

    2025年4月18日

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  • Jiaxin Fan,
  • Fengmei Yao,
  • Jiahua Zhang

摘要

The frequent occurrence of compound heatwave events (CHEs) is the distinguish feature of the enhanced instability of the climate system under the context of global warming. Further exploration into the different regional characteristics of CHEs on long timescale is in urgent need. This research provides a comprehensive analysis of characteristics of spatio-temporal change of China's compound extreme heatwave events including dry heatwave events (DHEs) and moist heatwave events (MHEs) from 1955 to 2023 in summer (JJA) in 8 sub-regions of China. The results revealed that: (1) An abrupt change of summer TMAX has taken place in China in 1999 which is highly correlated with the occurrence of a series of compound heatwave events; (2) Multiple indexes demonstrated a significant increasing trend since 1999 including the annual frequency, magnitude and duration of CHEs; (3) The annual frequency, magnitude, duration of DHEs in NC, NEC, TP, ENC and WNC regions during 2000–2023 increased dramatically compared to the period 1955–1999; (4) The average of frequency, magnitude, duration of MHEs during 2000–2023 increased significantly compared to the period 1955–1999 in all 8 sub-regions especially in SC and SWC regions; (5) The indexes of DHEs and MHEs showed different changing rate before and after the abrupt change of TMAX. The results of this study can provide scientific insights into the understanding of extreme compound events and ways to improve predictions.