Anthropogenic climate change impacts exacerbate summer forest fires in California
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Turco, Marco; Abatzogloub, John T.; Herrera García, Sixto; Zhuangd, Yizhou; Jerez, Sonia; Lucas, Donald D.; AghaKouchak, Amir; Cvijanovic, IvanaFecha
2023-06Derechos
© National Academy of Sciences - Attribution-NonCommercial-NoDerivatives 4.0 International
Publicado en
Proceedings of the National Academy of Sciences of the United States of America, 2023, 120 (25), e2213815120
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National Academy of Sciences
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Palabras clave
Anthropogenic climate change
Forest fires
California
Resumen/Abstract
Record-breaking summer forest fires have become a regular occurrence in California. Observations
indicate a fivefold increase in summer burned area (BA) in forests in northern and central California during 1996 to 2021 relative to 1971 to 1995. While the higher temperature and increased dryness have been suggested to be the leading causes of increased BA, the extent to which BA changes are due to natural variability or anthropogenic climate change remains unresolved. Here, we develop a climate-driven model of summer BA evolution in California and combine it with natural-only and historical climate simulations to assess the importance of anthropogenic climate change on increased BA. Our results indicate that nearly all the observed increase in BA is due to anthropogenic climate change as historical model simulations accounting for anthropogenic forcing yield 172% (range 84 to 310%) more area burned than simula- tions with natural forcing only. We detect the signal of combined historical forcing on the observed BA emerging in 2001 with no
detectable influence of the natural forcing alone. In addition, even when considering fuel limitations from fire-fuel feedbacks, a 3 to 52% increase in BA relative to the last decades is expected in the next decades (2031
to 2050), highlighting the need for proactive adaptations.
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