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<p>This study utilizes data from 1979 to 2023 and employs a 1-year sliding window approach to construct networks for each 10-year period, analyzing the synchronization patterns of extreme rainfall events in Southwest China. The average weighted degree of these networks is defined as a synchronization index, which quantifies the synchronization between rainfall events across the region. The results reveal a significant upward trend in the synchronization index, indicating that extreme rainfall events occurring simultaneously in Southwest China are steadily increasing. Furthermore, through partial correlation, contribution rate, and composite analyses, the study demonstrates that the Indian Ocean Warm Pool Strength Index (IOWPSI) independently influences the synchronization patterns of extreme rainfall events in Southwest China. In contrast, the Western Pacific Warm Pool Strength Index (WPWPSI) exerts a comparatively weaker independent effect on synchronization in this region. However, the interaction between the IOWPSI and the WPWPSI modulates the Western Pacific Subtropical High, thereby enhancing its influence on the synchronization of extreme rainfall events in Southwest China.</p>

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Synchronization patterns of extreme rainfall events in Southwest China

  • 期刊论文

  • 发表日期：

    2025年2月24日

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  • Panjie Qiao,
  • Xiaojuan Wang,
  • Wenqi Liu,
  • Shuai Li,
  • Yongwen Zhang,
  • Guolin Feng,
  • Jingfang Fan

摘要

This study utilizes data from 1979 to 2023 and employs a 1-year sliding window approach to construct networks for each 10-year period, analyzing the synchronization patterns of extreme rainfall events in Southwest China. The average weighted degree of these networks is defined as a synchronization index, which quantifies the synchronization between rainfall events across the region. The results reveal a significant upward trend in the synchronization index, indicating that extreme rainfall events occurring simultaneously in Southwest China are steadily increasing. Furthermore, through partial correlation, contribution rate, and composite analyses, the study demonstrates that the Indian Ocean Warm Pool Strength Index (IOWPSI) independently influences the synchronization patterns of extreme rainfall events in Southwest China. In contrast, the Western Pacific Warm Pool Strength Index (WPWPSI) exerts a comparatively weaker independent effect on synchronization in this region. However, the interaction between the IOWPSI and the WPWPSI modulates the Western Pacific Subtropical High, thereby enhancing its influence on the synchronization of extreme rainfall events in Southwest China.