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<p>El Niño significantly impacts the global Hadley circulation (HC), however, the modulation of different decay rates of El Niño on the HC is overlooked. Our research reveals that rapid decay (RD) events cause the global HC to exhibit an equatorially asymmetric configuration, in contrast to the quasi-symmetric structure seen during slow decay (SD) events. This is primarily driven by HC anomalies in the central-eastern Pacific, influenced by anomalous sea surface temperatures that impact the conversion of atmospheric perturbation potential energy to kinetic energy. The structure of regional HC anomalies in the Indo-Pacific Warm Pool (IPWP) exhibits contrasting patterns within different events. During RD (SD) events, the intensified (weakened) regional HC over the IPWP results in increased (decreased) terrestrial precipitation over its coastal countries. Therefore, our findings have important implications for understanding and predicting regional climate impacts associated with different El Niño decay patterns.</p>

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Distinct Hadley circulation attributable to rapid and slow El Niño decay and its regional impacts

  • 期刊论文

  • 出版模式：

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  • 发表日期：

    2025年10月13日

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  • Xuanliang Ji,
  • Juan Feng,
  • Jianping Li,
  • Yazhou Zhang

摘要

El Niño significantly impacts the global Hadley circulation (HC), however, the modulation of different decay rates of El Niño on the HC is overlooked. Our research reveals that rapid decay (RD) events cause the global HC to exhibit an equatorially asymmetric configuration, in contrast to the quasi-symmetric structure seen during slow decay (SD) events. This is primarily driven by HC anomalies in the central-eastern Pacific, influenced by anomalous sea surface temperatures that impact the conversion of atmospheric perturbation potential energy to kinetic energy. The structure of regional HC anomalies in the Indo-Pacific Warm Pool (IPWP) exhibits contrasting patterns within different events. During RD (SD) events, the intensified (weakened) regional HC over the IPWP results in increased (decreased) terrestrial precipitation over its coastal countries. Therefore, our findings have important implications for understanding and predicting regional climate impacts associated with different El Niño decay patterns.