Douville (2026) How Do Projections of Meteorological Droughts Vary Across Models and Regions?

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

Identification

• Journal: Geophysical Research Letters
• Year: 2026
• Date: 2026-02-12
• Authors: H. Douville
• DOI: 10.1029/2025gl119644

Research Groups

Not explicitly stated in the abstract.

Short Summary

This study quantifies future changes in meteorological drought properties using Earth system models and the standardized precipitation index, identifying regional "dry spots" where drought severity is projected to increase, primarily due to prolonged duration.

Objective

• To quantify how and where climate change will alter meteorological drought properties, including their mean frequency, intensity, length of drought intervals, duration, starting date, and severity.

Study Configuration

• Spatial Scale: Global and regional, with specific focus on "northern South America and the Caribbean Islands".
• Temporal Scale: Future climate projections (from Earth system models), distinguishing two extended 6-month seasons (October-March and April-September).

Methodology and Data

• Models used: Latest generation of Earth system models (ESMs), Standardized Precipitation Index (SPI).
• Data sources: Output from Earth system models. Observational constraints were applied to attempt to reduce inter-model spread.

Main Results

• Consistent changes in drought properties are projected across timescales and seasons.
• Regional "dry spots" are identified, including northern South America and the Caribbean Islands.
• In these identified "dry spots", the median model response shows the largest increase in drought severity, predominantly as a result of prolonged drought duration.
• Substantial inter-model spread persists in many regions, and this spread could not be reduced by applying global and regional observational constraints.

Contributions

• Explores a comprehensive set of drought metrics beyond just mean frequency and intensity, including length of drought intervals, duration, starting date, and severity.
• Identifies specific regional "dry spots" where future drought severity is projected to increase most significantly.
• Highlights the limitations of using global and regional observational constraints to reduce inter-model spread in drought projections.

Funding

Not explicitly stated in the abstract.

Citation

@article{Douville2026How,
  author = {Douville, H.},
  title = {How Do Projections of Meteorological Droughts Vary Across Models and Regions?},
  journal = {Geophysical Research Letters},
  year = {2026},
  doi = {10.1029/2025gl119644},
  url = {https://doi.org/10.1029/2025gl119644}
}