Lu et al. (2026) Divergent Trends and Driving Factors in Meteorological Flash Droughts Across China's Humid and Arid Regions

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Identification

• Journal: International Journal of Climatology
• Year: 2026
• Date: 2026-05-08
• Authors: Xiaojuan Lu, Junhu Zhao, Jie Yang, Jinqing Zuo, Pengcheng Yan, Hongyan Shen, Yiping Li
• DOI: 10.1002/joc.70380

Research Groups

Not specified in the provided text.

Short Summary

This study analyzes the spatiotemporal patterns and drivers of meteorological flash droughts (MFDs) in China from 1980 to 2024, revealing that humid regions are experiencing increasing frequency and accelerated onset despite an overall national decline in MFD frequency.

Objective

• To systematically analyze the spatiotemporal patterns and mechanistic drivers of meteorological flash droughts (MFDs) across China's various climatic zones and seasons.

Study Configuration

• Spatial Scale: National scale (China), categorized by climatic zones (Humid Regions vs. Drier Regions).
• Temporal Scale: 1980–2024.

Methodology and Data

• Models used: Meteorological Drought Composite Index (MCI).
• Data sources: Operational meteorological data (used to calculate the MCI).

Main Results

• Spatial Patterns: Humid regions exhibit a higher frequency of MFDs but shorter durations compared to drier regions; onset speed does not show a clear dependence on humidity.
• Temporal Trends:
  • Overall China: Declining MFD frequency, prolonged duration, and significantly slowed onset.
  • Humid Regions (HR): Increasing frequency (significant in western HR during summer and eastern HR during spring), extended duration (most pronounced in summer), and significantly accelerated onset in eastern HR.
  • Recent Trend: A concurrent rise in both frequency and duration was observed in humid regions between 2020 and 2024.
• Mechanisms:
  • Drier Regions: Evapotranspiration (ET) is soil moisture-limited at onset, and coupled soil moisture–ET suppression prolongs the drought.
  • Humid Regions: ET shifts from energy-limited at onset to soil moisture-limited during recovery, leading to shorter event durations.
  • Primary Driver: The duration of precipitation deficits is the dominant driver, contributing over 30% to both MFD duration and onset speed.

Contributions

• Advances the mechanistic understanding of flash droughts by differentiating the land-atmosphere coupling processes between humid and dry regions.
• Provides a scientific foundation for improving the monitoring, early warning systems, and adaptive management of flash droughts in China.

Funding

Not specified in the provided text.

Citation

@article{Lu2026Divergent,
  author = {Lu, Xiaojuan and Zhao, Junhu and Yang, Jie and Zuo, Jinqing and Yan, Pengcheng and Shen, Hongyan and Li, Yiping},
  title = {Divergent Trends and Driving Factors in Meteorological Flash Droughts Across China's Humid and Arid Regions},
  journal = {International Journal of Climatology},
  year = {2026},
  doi = {10.1002/joc.70380},
  url = {https://doi.org/10.1002/joc.70380}
}