2026-01-02 カリフォルニア大学アーバイン校（UCI）
＜関連情報＞
- https://news.uci.edu/2026/01/02/uc-irvine-scientists-discover-what-drives-californias-worst-fire-years/
- https://www.science.org/doi/10.1126/sciadv.adx6477
多重点火火災複合が極度の火災年数と影響を引き起こす Multi-ignition fire complexes drive extreme fire years and impacts
Rebecca C. Scholten, Tirtha Banerjee, Yang Chen, Andrea Delgado, […] , and James T. Randerson
Science Advances Published:2 Jan 2026
DOI:https://doi.org/10.1126/sciadv.adx6477
Abstract
Climate change is intensifying fire behavior, with the largest and fastest-spreading fires causing the greatest impacts on people and ecosystems. Yet the mechanisms driving variability and trends in large fires remain poorly understood. Using 12-hour satellite-derived fire tracking data from 2012 to 2023, we show that the merging of separate ignitions into multi-ignition complexes is a key process amplifying fire size and destructive potential across temperate and boreal ecoregions. Multi-ignition fires account for 31% of the burned area in California and 59% in the Arctic-boreal domain, spread faster and persist longer than single-ignition fires, and disproportionately contribute to extreme fire years in California, Canada, and Siberia. They also generate stronger atmospheric feedbacks, produce more pyrocumulonimbus events, and strain firefighting capacity by dispersing suppression resources. Recognizing and accounting for fire-merging dynamics are critical for improving wildfire prediction, risk assessment, and management.
