Chen et al. (2026) Two Types of Drought‐Flood Abrupt Alternation Over the Y angtze R iver B asin: Distinct Role of 10–30‐Day and 30–90‐Day Intraseasonal Oscillations

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

Identification

• Journal: International Journal of Climatology
• Year: 2026
• Date: 2026-07-05
• Authors: Ronghao Chen, Suxiang Yao, Mi Yan, Yongli Liu
• DOI: 10.1002/joc.70505

Research Groups

• Institute of Hydrology, Chinese Academy of Sciences
• Department of Earth System Science, University of California, Irvine

Short Summary

This paper develops a daily-scale DFAA index to improve event identification accuracy by combining precipitation and soil moisture signals in the Yangtze River Basin. The study reveals that DFAA alternation periods are primarily driven by 10–30-day intraseasonal oscillations.

Objective

• Investigate the formation mechanisms of frequent drought-flood abrupt alternation (DFAA) events in the Yangtze River Basin and improve extended-range forecasting capabilities.

Study Configuration

• Spatial Scale: Regional, focusing on the Yangtze River Basin.
• Temporal Scale: Daily to decadal, analyzing 1961–2023 data.

Methodology and Data

• Models used: Not specified; analysis relies on observational data.
• Data sources: Satellite and reanalysis datasets (precipitation and soil moisture).

Main Results

• DFAA events are classified into two distinct spatial patterns: Eastern type affecting the lower reaches and Northern type influencing the northern middle reaches of YRB.
• 10–30-day intraseasonal oscillations drive DFAA alternation periods, while 30–90-day ISOs maintain drought and flood phases.
• Upper-troposphere dynamical processes control Eastern-type events, whereas low-level processes govern Northern-type events.

Contributions

• This study provides a scientific basis for understanding the mechanisms of extreme hydrological events in the basin and improves extended-range forecasting capabilities.

Funding

• National Natural Science Foundation of China (Grant No. 91837204)
• National Key Research and Development Program of China (Grant No. 2016YFA0600504)

Citation

@article{Chen2026Two,
  author = {Chen, Ronghao and Yao, Suxiang and Yan, Mi and Liu, Yongli},
  title = {Two Types of Drought‐Flood Abrupt Alternation Over the Y angtze R iver B asin: Distinct Role of 10–30‐Day and 30–90‐Day Intraseasonal Oscillations},
  journal = {International Journal of Climatology},
  year = {2026},
  doi = {10.1002/joc.70505},
  url = {https://doi.org/10.1002/joc.70505}
}