Devitt et al. (2025) Spatiotemporal changes in UK heavy rainfall events not captured by intensity-based methods

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

Identification

• Journal: Environmental Research Letters
• Year: 2025
• Date: 2025-10-27
• Authors: Laura Devitt, Leanne Archer, Gemma Coxon, Jeffrey Neal, Paul Bates, Dan Bernie, Elizabeth Kendon
• DOI: 10.1088/1748-9326/ae17dc

Research Groups

Not explicitly stated in the abstract.

Short Summary

This study investigates the evolving spatiotemporal characteristics of heavy rainfall events across the UK using a high-resolution, convection-permitting ensemble. It reveals that future winter events become more localized with increased peak intensities, while summer events expand spatially, leading to greater total precipitation volumes, highlighting changes beyond simple intensity shifts.

Objective

• To explore how the spatiotemporal characteristics of heavy rainfall events may evolve across the UK under future climate conditions.
• To compare changes in future rainfall events to those derived from applying intensity-based scaling factors alone, identifying aspects of rainfall change not captured by shifts in intensity distributions.

Study Configuration

• Spatial Scale: Across the UK; 5 km grid resolution.
• Temporal Scale: Hourly rainfall data; future climate conditions compared to a baseline period. Events analyzed over a 21-day window for clustering.

Methodology and Data

• Models used: UK climate projections local dataset (high-resolution, convection-permitting ensemble).
• Data sources: 12 ensemble members of hourly rainfall data. An event-based framework was adopted for analysis.

Main Results

• Short-duration winter heavy rainfall events become increasingly localised, with peak intensities increasing by up to 47%, amplifying flash flood potential.
• Summer heavy rainfall events exhibit expanded spatial extents, increasing by 25%–40%, which magnifies total precipitation volumes.
• Small changes are observed in the number of clustered heavy rainfall events (occurring within a 21-day window).
• Large changes are found in the contribution of clustered events to seasonal precipitation, particularly in summer (increasing from 7%–11% in the baseline to 11%–16% in the future period).

Contributions

• Provides new insights into how heavy rainfall may change under future climate conditions, going beyond simple intensity increases.
• Identifies specific spatiotemporal changes (localization, spatial expansion, contribution of clustered events) relevant for informing current flood risk estimation practices.
• Highlights aspects of rainfall change not captured by intensity-based scaling factors alone.

Funding

Not explicitly stated in the abstract.

Citation

@article{Devitt2025Spatiotemporal,
  author = {Devitt, Laura and Archer, Leanne and Coxon, Gemma and Neal, Jeffrey and Bates, Paul and Bernie, Dan and Kendon, Elizabeth},
  title = {Spatiotemporal changes in UK heavy rainfall events not captured by intensity-based methods},
  journal = {Environmental Research Letters},
  year = {2025},
  doi = {10.1088/1748-9326/ae17dc},
  url = {https://doi.org/10.1088/1748-9326/ae17dc}
}