Wang et al. (2025) Divergences in typhoon and non-typhoon extreme rainfall trends and their spatial variations at multiple timescales in typical region of southeastern China

Identification

• Journal: Atmospheric Research
• Year: 2025
• Date: 2025-10-30
• Authors: Senzhen Wang, Weifang Ruan, Xiaocheng Li, Huaxia Yao, Haijun Deng, Chunqiang Li, Xingwei Chen
• DOI: 10.1016/j.atmosres.2025.108590

Research Groups

• Fujian Normal University (School of Geographical Sciences, School of Carbon Neutrality Future Technology, Key Laboratory of Humid Subtropical Eco-geographical Processes of Ministry of Education)
• Fujian Institute of Water Resources & Hydropower Research
• Nipissing University (Department of Biology, Chemistry and Geography)
• Nanjing University (School of Geography and Ocean Science)

Short Summary

This study analyzed divergent long-term trends and spatial patterns of typhoon-related and non-typhoon-related extreme rainfall across multiple timescales in Fujian, southeastern China, revealing distinct temporal and spatial variations for each type of rainfall.

Objective

• To compare long-term trends and spatial patterns of typhoon-related extreme rainfall (TER) and non-typhoon-related extreme rainfall (non-TER) across multiple timescales in Fujian, southeastern China, to understand their divergent evolution.

Study Configuration

• Spatial Scale: Fujian Province, southeastern China.
• Temporal Scale: 1961–2021 (61 years).

Methodology and Data

• Models used: Statistical trend analysis (e.g., long-term trends, spatial patterns analysis).
• Data sources: Observational total rainfall and maximum daily rainfall data.

Main Results

• Divergent timescale effects were observed in the trends of TER and non-TER in Fujian between 1961 and 2021.
• TER showed no significant trends at annual and typhoon-season scales but exhibited a significant increasing trend specifically for August.
• Non-TER displayed a significant upward trend for the typhoon season but no significant trends at other timescales.
• Temporally, the significant increase in August TER was primarily driven by concentrated typhoon frequency and increased typhoon linger time during that month.
• Spatially, the combined influences of terrain and typhoon tracks resulted in a greater relative increase in August TER in the western region compared to the eastern region, creating a distinct west-east divergence.

Contributions

• Provides a novel approach by distinguishing between typhoon rainfall and non-typhoon rainfall for analyzing extreme rainfall evolution.
• Investigates extreme rainfall variability across multiple timescales (beyond annual or seasonal) and their spatial patterns, addressing a gap in existing literature.
• Offers new insights into regional extreme rainfall evolution under distinct weather systems in East Asia.

Funding

• Not specified in the provided text.

Citation

@article{Wang2025Divergences,
  author = {Wang, Senzhen and Ruan, Weifang and Li, Xiaocheng and Yao, Huaxia and Deng, Haijun and Li, Chunqiang and Chen, Xingwei},
  title = {Divergences in typhoon and non-typhoon extreme rainfall trends and their spatial variations at multiple timescales in typical region of southeastern China},
  journal = {Atmospheric Research},
  year = {2025},
  doi = {10.1016/j.atmosres.2025.108590},
  url = {https://doi.org/10.1016/j.atmosres.2025.108590}
}