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Quantifying the Importance of antecedent fuel-related vegetation properties for burnt area using random forests

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Title: Quantifying the Importance of antecedent fuel-related vegetation properties for burnt area using random forests
Authors: Kuhn-Régnier, A
Voulgarakis, A
Nowack, P
Forkel, M
Prentice, IC
Harrison, SP
Item Type: Journal Article
Abstract: The seasonal and longer-term dynamics of fuel accumulation affect fire seasonality and the occurrence of extreme wildfires. Failure to account for their influence may help to explain why state-of-the-art fire models do not simulate the length and timing of the fire season or interannual variability in burnt area well. We investigated the impact of accounting for different timescales of fuel production and accumulation on burnt area using a suite of random forest regression models that included the immediate impact of climate, vegetation, and human influences in a given month and tested the impact of various combinations of antecedent conditions in four productivity-related vegetation indices and in antecedent moisture conditions. Analyses were conducted for the period from 2010 to 2015 inclusive. Inclusion of antecedent vegetation conditions representing fuel build-up led to an improvement of the global, climatological out-of-sample R 2 from 0.579 to 0.701, but the inclusion of antecedent vegetation conditions on timescales ≥ 1 year had no impact on simulated burnt area. Current moisture levels were the dominant influence on fuel drying. Additionally, antecedent moisture levels were important for fuel build-up. The models also enabled the visualisation of interactions between variables, such as the importance of antecedent productivity coupled with instantaneous drying. The length of the period which needs to be considered varies across biomes; fuel-limited regions are sensitive to antecedent conditions that determine fuel build-up over longer time periods (∼ 4 months), while moisture-limited regions are more sensitive to current conditions that regulate fuel drying.
Issue Date: 29-Jun-2021
Date of Acceptance: 18-May-2021
URI: http://hdl.handle.net/10044/1/96603
DOI: 10.5194/bg-2020-409
ISSN: 1726-4170
Publisher: Copernicus Publications
Journal / Book Title: Biogeosciences
Volume: 8
Copyright Statement: © Author(s) 2021. This work is distributed under the Creative Commons Attribution 4.0 License
Keywords: Meteorology & Atmospheric Sciences
04 Earth Sciences
05 Environmental Sciences
06 Biological Sciences
Publication Status: Published
Open Access location: https://bg.copernicus.org/articles/18/3861/2021/bg-18-3861-2021.pdf
Appears in Collections:Space and Atmospheric Physics
Physics
Grantham Institute for Climate Change



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