Zhao et al. (2026) Multiscale Dynamic Mechanisms of Drought‐Flood Abrupt Alternation Events in the Yangtze River Basin

⚠️ Warning: This summary was generated from the abstract only, as the full text was not available.

Identification

• Journal: Journal of Geophysical Research Atmospheres
• Year: 2026
• Date: 2026-06-27
• Authors: Yingxiao Sun, Qianrong Ma, Hongjia Lei, Hao Wu, Zhiwei Zhu
• DOI: 10.1029/2025jd046199

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 identifies drought-flood abrupt alternation (DFAA) events in the Yangtze River Basin using a standardized weighted average precipitation index combined with run theory. The research reveals that large-scale circulation patterns coordinate across time scales to produce DFAA, providing valuable guidance for improving prediction of these high-impact events.

Objective

• Investigate the underlying mechanisms of drought-flood abrupt alternation (DFAA) events in the Yangtze River Basin

Study Configuration

• Spatial Scale: The study focuses on the Yangtze River Basin (YRB), a major river basin in China.
• Temporal Scale: The analysis covers a period from May to September during 1961–2022.

Methodology and Data

• Models used: None mentioned, but the study utilizes a combination of precipitation index and run theory.
• Data sources: Satellite, observation, and reanalysis data are likely used, but specific sources are not provided.

Main Results

• A total of 1,097 DFAA events were detected in the YRB during the analysis period, including 89 regional events.
• Regional events occur most frequently in the middle and lower reaches of the YRB.
• Large-scale circulation patterns, such as intensified positive North Atlantic Oscillation and weakened midlatitude westerlies, enhance Ural blocking (UB), which is a key precursor to DFAA onset.

Contributions

• This study clarifies how large-scale circulation patterns coordinate across time scales to produce DFAA in the YRB.
• The identified early-stage signals provide valuable guidance for improving the prediction of these high-impact events.

Funding

• No funding information is provided in the abstract.

Citation

@article{Zhao2026Multiscale,
  author = {Zhao, Chunxuan and Sun, Yingxiao and Ma, Qianrong and Lei, Hongjia and Wu, Hao and Zhu, Zhiwei},
  title = {Multiscale Dynamic Mechanisms of Drought‐Flood Abrupt Alternation Events in the Yangtze River Basin},
  journal = {Journal of Geophysical Research Atmospheres},
  year = {2026},
  doi = {10.1029/2025jd046199},
  url = {https://doi.org/10.1029/2025jd046199}
}