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Emergent relationships with respect to burned area in global satellite observations and fire-enabled vegetation models

Forkel, Matthias, Andela, Niels ORCID:, Harrison, Sandy P., Lasslop, Gitta, Marle, Margreet van, Chuvieco, Emilio, Dorigo, Wouter, Forrest, Matthew, Hantson, Stijn, Heil, Angelika, Li, Fang, Melton, Joe, Sitch, Stephen, Yue, Chao and Arneth, Almut 2019. Emergent relationships with respect to burned area in global satellite observations and fire-enabled vegetation models. Biogeosciences 16 (1) , pp. 57-76. 10.5194/bg-16-57-2019

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Recent climate changes have increased fire-prone weather conditions in many regions and have likely affected fire occurrence, which might impact ecosystem functioning, biogeochemical cycles, and society. Prediction of how fire impacts may change in the future is difficult because of the complexity of the controls on fire occurrence and burned area. Here we aim to assess how process-based fire-enabled dynamic global vegetation models (DGVMs) represent relationships between controlling factors and burned area. We developed a pattern-oriented model evaluation approach using the random forest (RF) algorithm to identify emergent relationships between climate, vegetation, and socio-economic predictor variables and burned area. We applied this approach to monthly burned area time series for the period from 2005 to 2011 from satellite observations and from DGVMs from the “Fire Modeling Intercomparison Project” (FireMIP) that were run using a common protocol and forcing data sets. The satellite-derived relationships indicate strong sensitivity to climate variables (e.g. maximum temperature, number of wet days), vegetation properties (e.g. vegetation type, previous-season plant productivity and leaf area, woody litter), and to socio-economic variables (e.g. human population density). DGVMs broadly reproduce the relationships with climate variables and, for some models, with population density. Interestingly, satellite-derived responses show a strong increase in burned area with an increase in previous-season leaf area index and plant productivity in most fire-prone ecosystems, which was largely underestimated by most DGVMs. Hence, our pattern-oriented model evaluation approach allowed us to diagnose that vegetation effects on fire are a main deficiency regarding fire-enabled dynamic global vegetation models' ability to accurately simulate the role of fire under global environmental change.

Item Type: Article
Date Type: Publication
Status: Published
Schools: Earth and Environmental Sciences
Publisher: European Geosciences Union (EGU) / Copernicus Publications
ISSN: 1726-4170
Date of First Compliant Deposit: 22 July 2020
Date of Acceptance: 11 December 2018
Last Modified: 06 Jul 2023 17:16

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