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<p>Using site-observed and gridded rainfall data from China and the NCEP reanalysis, this study investigates the characteristics and mechanisms of EREs in the Sichuan-Chongqing-Shaanxi (SCS) region and preliminarily explores precursory signals from the perspective of Tibetan Plateau thermal forcings. On extreme high rainfall (EHR) days from 1979 to 2022, extreme rainfall events (EREs) dominated total rainfall amounts (TRAs) in the SCS region. Compared to 1983–2012, the recent decade (2013–2022) shows a decrease in the ERE frequency and the contribution to TRA but an increase in high-intensity events (i.e., torrential/downpour rainfall or stronger events). The frequent occurrences of EREs may result from multi-level atmospheric interactions. Upper-tropospheric circulation anomalies position the SCS region between trough and ridge of the westerly, enhancing convergence and convection. Concurrently, mid-low-level anticyclonic anomalies over eastern and southern China drive moisture transport via low-level anomalous southerlies along the eastern Tibetan Plateau. Additionally, the southeastern Tibetan Plateau heating stimulates northward-tilted vertical motion toward the SCS region. These combined dynamics establish favorable conditions for the occurrence of EREs. Notably, plateau thermal anomalies emerge two days preceding EREs, suggesting potential predictive value. These findings provide valuable insights for the mechanisms behind frequent EREs in the SCS region, providing scientific support for the development of effective adaptation and mitigation strategies.</p>

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Characteristics and causes of July extreme rainfall events in the Sichuan-Chongqing-Shaanxi region, China

  • 期刊论文

  • 出版模式：

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  • 发表日期：

    2025年8月1日

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  • Rongwei Liao,
  • Ge Liu,
  • Huaiyu Liu

摘要

Using site-observed and gridded rainfall data from China and the NCEP reanalysis, this study investigates the characteristics and mechanisms of EREs in the Sichuan-Chongqing-Shaanxi (SCS) region and preliminarily explores precursory signals from the perspective of Tibetan Plateau thermal forcings. On extreme high rainfall (EHR) days from 1979 to 2022, extreme rainfall events (EREs) dominated total rainfall amounts (TRAs) in the SCS region. Compared to 1983–2012, the recent decade (2013–2022) shows a decrease in the ERE frequency and the contribution to TRA but an increase in high-intensity events (i.e., torrential/downpour rainfall or stronger events). The frequent occurrences of EREs may result from multi-level atmospheric interactions. Upper-tropospheric circulation anomalies position the SCS region between trough and ridge of the westerly, enhancing convergence and convection. Concurrently, mid-low-level anticyclonic anomalies over eastern and southern China drive moisture transport via low-level anomalous southerlies along the eastern Tibetan Plateau. Additionally, the southeastern Tibetan Plateau heating stimulates northward-tilted vertical motion toward the SCS region. These combined dynamics establish favorable conditions for the occurrence of EREs. Notably, plateau thermal anomalies emerge two days preceding EREs, suggesting potential predictive value. These findings provide valuable insights for the mechanisms behind frequent EREs in the SCS region, providing scientific support for the development of effective adaptation and mitigation strategies.