Coupled influence of Western Pacific moisture anomalies and mid-tropospheric humidity on October precipitation in Yunnan Province Southwest China
In the Asian monsoon region, October marks the transition from the wet to the dry season, during which precipitation variability plays a crucial role in regional water management and ecological stability. In recent decades, intensified climate warming has led to more frequent extreme precipitation e...
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| Autori principali: | , , , , , , , , , , , , |
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| Natura: | Article (Journal) |
| Lingua: | inglese |
| Pubblicazione: |
3 February 2026
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| In: |
Atmospheric research
Year: 2026, Volume: 336, Pages: 1-15 |
| ISSN: | 1873-2895 |
| DOI: | 10.1016/j.atmosres.2026.108830 |
| Accesso online: | Verlag, kostenfrei, Volltext: https://doi.org/10.1016/j.atmosres.2026.108830 Verlag, kostenfrei, Volltext: https://www.sciencedirect.com/science/article/pii/S0169809526000943 
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| Note sull'autore: | Wen-Jun Sun, Zhen-Peng Tao, Zi-Yang Zhang, Tian-Qing Lan, Taohui Li, Peng Zi, Jian Zhang, Yao Wu, Ming-Qiang Liang, Chao-Jun Chen, Yuan-Yuan Mu, Jun-Yun Li, Ting-Yong Li |
| Riassunto: | In the Asian monsoon region, October marks the transition from the wet to the dry season, during which precipitation variability plays a crucial role in regional water management and ecological stability. In recent decades, intensified climate warming has led to more frequent extreme precipitation events across Southwest China, posing substantial challenges to agriculture and economic development in the rain-fed Yunnan Province. Using long-term surface observations and ERA5 reanalysis data from 1961 to 2024, this study applies statistical and diagnostic analyses to identify the dominant physical drivers of October precipitation variability in Yunnan. The results show that the Western Tropical Pacific Moisture Anomaly Index (WTPAI) and mid-tropospheric relative humidity (RH) jointly regulate interannual precipitation changes. The positive influence of WTPAI on precipitation is subject to a humidity threshold near 49%, indicating that moisture anomalies amplify precipitation only under sufficiently moist conditions. Furthermore, the Western Pacific Subtropical High (WPSH) primarily modulates WTPAI through its ridge position, linking large-scale circulation to regional moisture supply. Based on these findings, a “humidity threshold plus regional moisture anomaly” framework is proposed to describe the synergistic amplification mechanism between humidity and moisture transport. This framework clarifies the dynamic-thermodynamic coupling processes controlling autumn precipitation over Yunnan and provides a scientific basis for improved precipitation attribution, prediction, and water resource management under a warming climate. |
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| Descrizione del documento: | Gesehen am 24.06.2026 |
| Descrizione fisica: | Online Resource |
| ISSN: | 1873-2895 |
| DOI: | 10.1016/j.atmosres.2026.108830 |