Cheng et al. (2026) Diverse Multiscale Synergies Underlying Persistent Heavy Rainfall Formation During the Meiyu Period Over the Yangtze‐Huaihe Region

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Identification

• Journal: International Journal of Climatology
• Year: 2026
• Date: 2026-07-03
• Authors: Ziyan Cheng, Suxiang Yao
• DOI: 10.1002/joc.70494

Research Groups

• Institute of Atmospheric Physics, Chinese Academy of Sciences
• State Key Laboratory of Numerical Modeling for Atmospheric Sciences and Geophysical Fluid Dynamics

Short Summary

This study investigates the formation mechanisms of persistent heavy rainfall (PHR) events in China's Yangtze-Huaihe region during the Meiyu period from a multiscale perspective. The research reveals that coupling between background, quasi-biweekly, and synoptic-scale wind fields with background moisture accounts for 93.8% of total precipitation.

Objective

• Investigate the multiscale processes contributing to PHR events in the Yangtze-Huaihe region during the Meiyu period

Study Configuration

• Spatial Scale: Regional (Yangtze-Huaihe region, China)
• Temporal Scale: Daily to monthly scales, with a focus on the Meiyu period (June-August)

Methodology and Data

• Models used: Not specified
• Data sources: Historical precipitation data from 1961-2020, analyzed using multiscale contribution decomposition

Main Results

• Coupling between background (> 30 days), quasi-biweekly (10-30 days), and synoptic-scale (< 10 days) wind fields with the background moisture field accounts for 93.8% of total precipitation.
• Three types of PHR events are identified: background-persistent, synoptic-transient, and multiscale hybrid.

Contributions

• This study provides a scientific basis for classification-based monitoring and refined forecasting of PHR events over the Yangtze-Huaihe region.
• The research reveals the importance of multiscale interactions in sustaining PHR events, which can inform future studies on precipitation patterns in similar regions.

Funding

• National Natural Science Foundation of China (Grant No. 91837204)
• Strategic Priority Research Program of the Chinese Academy of Sciences (Grant No. XDA19040201)

Citation

@article{Cheng2026Diverse,
  author = {Cheng, Ziyan and Yao, Suxiang and Qi, Wenna},
  title = {Diverse Multiscale Synergies Underlying Persistent Heavy Rainfall Formation During the Meiyu Period Over the Yangtze‐Huaihe Region},
  journal = {International Journal of Climatology},
  year = {2026},
  doi = {10.1002/joc.70494},
  url = {https://doi.org/10.1002/joc.70494}
}