Wei et al. (2025) Characteristics of spatio-temporal changes in flash droughts based on the CMIP6 Model

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

Identification

• Journal: Climate Research
• Year: 2025
• Date: 2025-11-13
• Authors: Wei Wei, Ting Liu, Fei Gao, Liang Zhou, Dang Lu, Junju Zhou, Yongze Song, Mohsen Sherif, Xiangyu Wang, Ashraf Dewan
• DOI: 10.3354/cr01761

Research Groups

Information not provided in the given paper text.

Short Summary

This study identifies flash droughts (FDs) using the standardized evaporative stress ratio (SESR) in CMIP6 historical and future Shared Socio-economic Pathway (SSP) scenarios, analyzing their frequency, duration, and intensity across different arid regions globally. The findings reveal significant regional differences in FD characteristics, with higher frequency and intensity in humid regions, leading to the classification of Governance, Concern, and Prevention Areas to inform regionally varied drought management strategies.

Objective

• To identify flash droughts (FDs) using the standardized evaporative stress ratio (SESR) in a historical simulation and under four future CMIP6 Shared Socio-economic Pathway (SSP) scenarios (SSP1-2.6, SSP2-4.5, SSP3-7.0, SSP5-8.5).
• To analyze and compare the frequency, duration, and intensity of FDs across different arid regions (classified by aridity index) under these future scenarios.
• To divide FD regions into Governance, Concern, and Prevention Areas based on future FD characteristics, contributing to regionally varied approaches for drought disaster response and prevention.

Study Configuration

• Spatial Scale: Global, with classification into different arid regions based on the aridity index.
• Temporal Scale: Historical simulation and future projections under 4 SSP scenarios (SSP1-2.6, SSP2-4.5, SSP3-7.0, SSP5-8.5) during the growing season. Flash drought duration is primarily 30 to 35 days.

Methodology and Data

• Models used: CMIP6 (Coupled Model Intercomparison Project Phase 6) climate models.
• Data sources: Actual and potential evapotranspiration data from CMIP6 model simulations.
• Key metrics/indices: Standardized Evaporative Stress Ratio (SESR) for FD identification, Aridity Index (AI) for region classification.

Main Results

• Significant regional differences were observed in global flash drought events.
• Flash drought frequency ranged from 10% to 30% in most areas.
• Flash drought duration was primarily 30 to 35 days in most areas.
• Flash drought intensity was mainly moderate, and the ranges of severe flash droughts under the four future scenarios were similar.
• Humid regions exhibited slightly higher flash drought frequency and duration under different scenarios compared to other arid regions.
• The proportion of different flash drought intensities in humid regions was considerably higher than in other arid regions.
• Flash drought regions were categorized into Governance, Concern, and Prevention Areas based on the overlay of flash drought characteristics under the four future scenarios.

Contributions

• Provides a comprehensive global analysis of flash drought characteristics (frequency, duration, intensity) under multiple future climate change scenarios (CMIP6 SSPs).
• Introduces a novel classification of flash drought regions into Governance, Concern, and Prevention Areas, offering a practical framework for developing regionally varied and targeted strategies for drought disaster response and prevention.
• Highlights the disproportionate impact of flash droughts on humid regions, challenging conventional perceptions of drought vulnerability.

Funding

Information not provided in the given paper text.

Citation

@article{Wei2025Characteristics,
  author = {Wei, Wei and Liu, Ting and Gao, Fei and Zhou, Liang and Lu, Dang and Zhou, Junju and Song, Yongze and Sherif, Mohsen and Wang, Xiangyu and Dewan, Ashraf},
  title = {Characteristics of spatio-temporal changes in flash droughts based on the CMIP6 Model},
  journal = {Climate Research},
  year = {2025},
  doi = {10.3354/cr01761},
  url = {https://doi.org/10.3354/cr01761}
}