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<p>This study explores the dry and wet responses across China to ENSO events and the relationship of these responses to the Pacific Decadal Oscillation (PDO), motivated by the need to understand the complex interactions between these climatic phenomena and their impacts on regional precipitation patterns. Utilizing Event Coincidence Analysis (ECA) on historical Dryness/Wetness Index (DWI) records and ENSO chronologies, we identify distinct regional patterns in precipitation responses. Our results show that in North China, positive PDO phases exacerbate dry conditions during ENSO events, while negative PDO phases lead to wetter conditions. Conversely, in the Yangtze River basin, positive PDO phases are associated with increased wet conditions during ENSO events, and negative phases with drier conditions. These findings have significant implications for disaster prevention and mitigation, particularly in managing drought and flood risks. Additionally, our study highlights the importance of considering PDO phases in long-term climate studies and demonstrates the value of ECA in analyzing climate records with missing data. This research provides a new perspective on the dynamic interplay between ENSO, PDO, and regional precipitation patterns, offering a novel metric for studying climate event relationships.</p>

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Dry/wet responses across China to ENSO events and their relationship to the PDO: an event coincidence analysis of historical records

  • 期刊论文

  • 发表日期：

    2025年10月18日

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  • Dong Wang,
  • Wenjing Jia

摘要

This study explores the dry and wet responses across China to ENSO events and the relationship of these responses to the Pacific Decadal Oscillation (PDO), motivated by the need to understand the complex interactions between these climatic phenomena and their impacts on regional precipitation patterns. Utilizing Event Coincidence Analysis (ECA) on historical Dryness/Wetness Index (DWI) records and ENSO chronologies, we identify distinct regional patterns in precipitation responses. Our results show that in North China, positive PDO phases exacerbate dry conditions during ENSO events, while negative PDO phases lead to wetter conditions. Conversely, in the Yangtze River basin, positive PDO phases are associated with increased wet conditions during ENSO events, and negative phases with drier conditions. These findings have significant implications for disaster prevention and mitigation, particularly in managing drought and flood risks. Additionally, our study highlights the importance of considering PDO phases in long-term climate studies and demonstrates the value of ECA in analyzing climate records with missing data. This research provides a new perspective on the dynamic interplay between ENSO, PDO, and regional precipitation patterns, offering a novel metric for studying climate event relationships.