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<p>The record-breaking heatwave over Central China in August 2022 raises fundamental questions regarding the relative roles of internal dynamical and thermodynamical processes in driving extreme temperature events. Using a dynamical adjustment framework, we quantitatively decomposed the contributions of internal dynamics and thermodynamics to this event. Our results indicate that internal atmospheric dynamics were the dominant driver, accounting for approximately 61% of the Tmax anomalies, while internal thermodynamical processes and long-term anthropogenic warming further amplified the regional warming signal. During 13–24 August, when Tmax anomalies reached their peak, internal dynamics played a particularly critical role. Given the close association between extreme heat and upper-tropospheric anticyclonic anomalies, we further quantified the major contributors to the anomalous high-pressure system during 13–24 August 2022. Negative sea surface temperature (SST) anomalies in the central Pacific and spring sea-ice concentration anomalies over the Greenland Sea contributed to the upper-level geopotential height anomaly. The Silk Road pattern (SRP) exerted the largest independent influence, contributing roughly 31% of the anomaly. Together, slowly varying oceanic and cryospheric forcings established a favorable large-scale background by modulating the upper-level anticyclone, whereas sub-seasonal variability associated with the SRP further amplified the mid-August anomalies. The combined effects of tropical and extratropical drivers across multiple timescales strengthened the upper-level anticyclone circulation, which in turn reinforced subsidence and sustained the intra-monthly extreme heatwave.</p>

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Revisiting the August 2022 extreme heatwave over the middle Yangtze River

  • 期刊论文

  • 发表日期：

    2026年4月7日

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  • Huiting Feng,
  • Yuhan Hu,
  • Yazhu Cui,
  • Hedi Ma,
  • Yimin Wu,
  • Shanlei Sun,
  • Wenjian Hua

摘要

The record-breaking heatwave over Central China in August 2022 raises fundamental questions regarding the relative roles of internal dynamical and thermodynamical processes in driving extreme temperature events. Using a dynamical adjustment framework, we quantitatively decomposed the contributions of internal dynamics and thermodynamics to this event. Our results indicate that internal atmospheric dynamics were the dominant driver, accounting for approximately 61% of the Tmax anomalies, while internal thermodynamical processes and long-term anthropogenic warming further amplified the regional warming signal. During 13–24 August, when Tmax anomalies reached their peak, internal dynamics played a particularly critical role. Given the close association between extreme heat and upper-tropospheric anticyclonic anomalies, we further quantified the major contributors to the anomalous high-pressure system during 13–24 August 2022. Negative sea surface temperature (SST) anomalies in the central Pacific and spring sea-ice concentration anomalies over the Greenland Sea contributed to the upper-level geopotential height anomaly. The Silk Road pattern (SRP) exerted the largest independent influence, contributing roughly 31% of the anomaly. Together, slowly varying oceanic and cryospheric forcings established a favorable large-scale background by modulating the upper-level anticyclone, whereas sub-seasonal variability associated with the SRP further amplified the mid-August anomalies. The combined effects of tropical and extratropical drivers across multiple timescales strengthened the upper-level anticyclone circulation, which in turn reinforced subsidence and sustained the intra-monthly extreme heatwave.