The response of wildfire regimes to Last Glacial Maximum  carbon dioxide and climate

Haas, Olivia; Prentice, Iain Colin; Harrison, Sandy P.

doi:https://doi.org/10.5194/bg-20-3981-2023

Articles | Volume 20, issue 18

https://doi.org/10.5194/bg-20-3981-2023

© Author(s) 2023. This work is distributed under
the Creative Commons Attribution 4.0 License.

https://doi.org/10.5194/bg-20-3981-2023

© Author(s) 2023. This work is distributed under
the Creative Commons Attribution 4.0 License.

Articles | Volume 20, issue 18

Research article

|

28 Sep 2023

Research article |

| 28 Sep 2023

The response of wildfire regimes to Last Glacial Maximum carbon dioxide and climate

Olivia Haas, Iain Colin Prentice, and Sandy P. Harrison

Supplement

https://doi.org/10.5194/bg-20-3981-2023-supplement

Data sets

Data for: The response of wildfire regimes to Last Glacial Maximum carbon dioxide and climate Olivia Haas https://doi.org/10.6084/m9.figshare.22285303.v2

Model code and software

R scripts to run models for: The response of wildfire regimes to Last Glacial Maximum carbon dioxide and climate Olivia Haas https://doi.org/10.6084/m9.figshare.22285279.v2

Scripts and input files Olivia Haas https://doi.org/10.6084/m9.figshare.19071044.v1

ImperialCollegeLondon/pyrealm: v0.10.1 (0.10.1) David Orme and Marion https://doi.org/10.5281/zenodo.8366848

jedokaplan/BIOME4: BIOME4 public release (1999) (v4.2.2) Jed O. Kaplan https://doi.org/10.5281/zenodo.8368294

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Short summary

We quantify the impact of CO₂ and climate on global patterns of burnt area, fire size, and intensity under Last Glacial Maximum (LGM) conditions using three climate scenarios. Climate change alone did not produce the observed LGM reduction in burnt area, but low CO₂ did through reducing vegetation productivity. Fire intensity was sensitive to CO₂ but strongly affected by changes in atmospheric dryness. Low CO₂ caused smaller fires; climate had the opposite effect except in the driest scenario.