Zhao et al. (2026) Global Characterization of Precipitation Peaks in the Seasonal Cycle

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

Identification

• Journal: Geophysical Research Letters
• Year: 2026
• Date: 2026-09-25
• Authors: Zijie Zhao, Yueyang Lu, Andréa Sardinha Taschetto
• DOI: 10.1029/2026gl125037

Research Groups

[Information not available in the provided abstract.]

Short Summary

This study introduces a global framework to identify the number of precipitation peaks (NPP) during rainy periods using daily precipitation data and harmonic seasonal fits. It reveals that multimodal precipitation seasonality is widespread, covering approximately 60% of global land, establishing NPP as a complementary metric for diagnosing precipitation seasonality.

Objective

• To introduce a global framework for identifying the number of precipitation peaks (NPP) during rainy periods from daily precipitation using optimal harmonic seasonal fits and reproducible peak-selection criteria.

Study Configuration

• Spatial Scale: Global land
• Temporal Scale: Daily precipitation data, analysis of seasonal cycles and long-term trends.

Methodology and Data

• Models used: Optimal harmonic seasonal fits, reproducible peak-selection criteria.
• Data sources: Daily precipitation data (type not specified beyond "daily precipitation").

Main Results

• Multimodal precipitation seasonality is widespread, covering approximately 60% of global land.
• Most multimodal regions exhibit two or three precipitation peaks.
• Higher-order precipitation regimes primarily occur in weakly seasonal dry or wet regions where the seasonal cycle is poorly defined.
• Detected precipitation peaks are generally separated by seasonal-scale intervals.
• The temporal evolution of NPP shows weak long-term trends, with larger temporal variability concentrated in regions with relatively weak seasonality.

Contributions

• Introduction of a novel global framework for systematically identifying the number of precipitation peaks (NPP) during rainy periods.
• First systematic global characterization of precipitation peak structure.
• Establishment of NPP as a new, complementary metric for diagnosing precipitation seasonality, moving beyond the traditional wet/dry period framework.

Funding

[Information not available in the provided abstract.]

Citation

@article{Zhao2026Global,
  author = {Zhao, Zijie and Lu, Yueyang and Taschetto, Andréa Sardinha},
  title = {Global Characterization of Precipitation Peaks in the Seasonal Cycle},
  journal = {Geophysical Research Letters},
  year = {2026},
  doi = {10.1029/2026gl125037},
  url = {https://doi.org/10.1029/2026gl125037}
}