Wang et al. (2025) The extent of drought determines daily area burned in Canadian forests

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

Identification

• Journal: Environmental Research Letters
• Year: 2025
• Date: 2025-12-01
• Authors: Weiwei Wang, Xianli Wang, Kerry Anderson, Peter Englefield, Dante Castellanos‐Acuña, Tom Swystun, Mike Flannigan
• DOI: 10.1088/1748-9326/ae2a53

Research Groups

Not explicitly stated in the abstract.

Short Summary

This study developed the first effective models to predict daily area burned (DAB) in Canadian forests, identifying a strong relationship between DAB and the spatial extent of fire-conducive weather, particularly fuel aridity. It found significant increases in DAB, a concentration of fire activity within the season, and more extreme DAB events across Canada from 1940 to 2023.

Objective

• To effectively model daily area burned (DAB) over a region, addressing the challenge of its high variability, and to identify relationships between DAB and fire-conducive weather conditions in Canadian forests.

Study Configuration

• Spatial Scale: Canadian forests (national, central, eastern regions).
• Temporal Scale:
  • Observations for model development: 2001–2023 (23 years).
  • Prediction and trend analysis: 1940–2023 (84 years).
  • Seasonal (summer) and daily resolution.

Methodology and Data

• Models used: Developed daily area burned (DAB) prediction models (specific model names not provided in abstract).
• Data sources: Observations of daily area burned and fire-conducive weather conditions (specifically fuel aridity) in Canadian forests.

Main Results

• A strong relationship was identified between daily area burned (DAB) and the spatial extent of fire-conducive weather conditions, particularly fuel aridity.
• Between 2001 and 2023, Canadian forests experienced approximately 126 active burning days per year, with an average national DAB of 207 889 300 m², and about two-thirds of active burning days occurring in summer.
• The central boreal forests showed more active burning days and higher DAB, while the eastern region experienced more extreme DAB.
• From 1940 to 2023, 62 days showed a significant increasing trend in predicted DAB, averaging approximately 601 400 m² per year nationally. These increases were mainly in the central region, in summer, and predominantly between 2000 and 2023.
• Daily fire activity has become more concentrated within the fire season, especially in the eastern region. The lengths of periods covering 50% and 90% of annual area burned decreased by 0.12 days and 0.25 days per year, respectively, across the country from 1940 to 2023.
• Extreme DAB events have become more extreme over the 84-year period:
  • Summer maximum DAB increased by 1 336 100 m².
  • The number of extreme burning days (DAB exceeding the 84-year mean by one standard deviation) increased by 0.36 days per year.
  • The proportion of area burned within these extreme days increased by 0.33% annually.

Contributions

• First-time effective modeling of daily area burned (DAB) over a region, addressing its high variability, which was previously unachieved.
• Identification of a strong, novel relationship between DAB and the spatial extent of fire-conducive weather conditions (fuel aridity).
• Quantification of long-term (1940-2023) trends in DAB, fire season concentration, and the increasing extremity of daily fire events across Canadian forests.

Funding

Not explicitly stated in the abstract.

Citation

@article{Wang2025extent,
  author = {Wang, Weiwei and Wang, Xianli and Anderson, Kerry and Englefield, Peter and Castellanos‐Acuña, Dante and Swystun, Tom and Flannigan, Mike},
  title = {The extent of drought determines daily area burned in Canadian forests},
  journal = {Environmental Research Letters},
  year = {2025},
  doi = {10.1088/1748-9326/ae2a53},
  url = {https://doi.org/10.1088/1748-9326/ae2a53}
}