Improved simulation of fire–vegetation interactions in the Land surface Processes and eXchanges dynamic global vegetation model (LPX-Mv1)
Douglas I. Kelley,Sandy P. Harrison,Sandy P. Harrison,Iain Colin Prentice,Iain Colin Prentice +4 more
TLDR
In this paper, a reatment of lightning that allows the fraction of ground strikes to vary spatially and seasonally, realistically partitions strike distribution between wet and dry days, and varies the number of dry days with strikes.Abstract:
. The Land surface Processes and eXchanges (LPX) model is a fire-enabled dynamic global vegetation model that performs well globally but has problems representing fire regimes and vegetative mix in savannas. Here we focus on improving the fire module. To improve the representation of ignitions, we introduced a reatment of lightning that allows the fraction of ground strikes to vary spatially and seasonally, realistically partitions strike distribution between wet and dry days, and varies the number of dry days with strikes. Fuel availability and moisture content were improved by implementing decomposition rates specific to individual plant functional types and litter classes, and litter drying rates driven by atmospheric water content. To improve water extraction by grasses, we use realistic plant-specific treatments of deep roots. To improve fire responses, we introduced adaptive bark thickness and post-fire resprouting for tropical and temperate broadleaf trees. All improvements are based on extensive analyses of relevant observational data sets. We test model performance for Australia, first evaluating parameterisations separately and then measuring overall behaviour against standard benchmarks. Changes to the lightning parameterisation produce a more realistic simulation of fires in southeastern and central Australia. Implementation of PFT-specific decomposition rates enhances performance in central Australia. Changes in fuel drying improve fire in northern Australia, while changes in rooting depth produce a more realistic simulation of fuel availability and structure in central and northern Australia. The introduction of adaptive bark thickness and resprouting produces more realistic fire regimes in Australian savannas. We also show that the model simulates biomass recovery rates consistent with observations from several different regions of the world characterised by resprouting vegetation. The new model (LPX-Mv1) produces an improved simulation of observed vegetation composition and mean annual burnt area, by 33 and 18% respectively compared to LPX.read more
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The status and challenge of global fire modelling
Stijn Hantson,Almut Arneth,Sandy P. Harrison,Sandy P. Harrison,Douglas I. Kelley,Douglas I. Kelley,I. Colin Prentice,I. Colin Prentice,Sam Rabin,Sally Archibald,Sally Archibald,Florent Mouillot,Steve R. Arnold,Paulo Artaxo,Dominique Bachelet,Philippe Ciais,Matthew Forrest,Pierre Friedlingstein,Thomas Hickler,Jed O. Kaplan,Silvia Kloster,Wolfgang Knorr,Gitta Lasslop,Fang Li,Stéphane Mangeon,Joe R. Melton,Andrea Meyn,Stephen Sitch,Allan Spessa,Allan Spessa,Guido R. van der Werf,Apostolos Voulgarakis,Chao Yue +32 more
TL;DR: The Fire Model Intercomparison Project (FireMIP) is an international initiative to compare and evaluate existing global fire models against benchmark data sets for present-day and historical conditions as discussed by the authors.
Journal ArticleDOI
Towards understanding resprouting at the global scale
Juli G. Pausas,R. Brandon Pratt,Jon E. Keeley,Jon E. Keeley,Anna L. Jacobsen,Aaron R. Ramirez,Aaron R. Ramirez,Alberto Vilagrosa,Susana Paula,Iolana N. Kaneakua-Pia,Stephen D. Davis +10 more
TL;DR: The aim is to show some of the complexities of resprouting while highlighting cautions that need be taken in using resprouted ability to predict vegetation responses across disturbance types and biomes.
Journal ArticleDOI
Reconstructions of biomass burning from sediment-charcoal records to improve data–model comparisons
Jennifer R. Marlon,Ryan Kelly,Anne-Laure Daniau,Boris Vannière,Mitchell J. Power,Patrick J. Bartlein,Philip E. Higuera,Olivier Blarquez,Simon Brewer,Tim Brücher,Angelica Feurdean,Graciela Gil Romera,Virginia Iglesias,S. Yoshi Maezumi,Brian I. Magi,Colin J. Courtney Mustaphi,Tonishtan Zhihai +16 more
TL;DR: The Global Charcoal Database version 3 (GCDv3) as discussed by the authors contains 736 charcoal records (57 more than in version 2) and provides new 1000-year and 22'000-year trends and gridded biomass burning reconstructions.
Journal ArticleDOI
Drought and resprouting plants
Melanie J. B. Zeppel,Sandy P. Harrison,Sandy P. Harrison,Henry D. Adams,Douglas I. Kelley,Guangqi Li,David T. Tissue,Todd E. Dawson,Rod Fensham,Belinda E. Medlyn,Anthony R. Palmer,Adam G. West,Nate G. McDowell +12 more
TL;DR: The strategy of resprout needs to be modelled explicitly to improve estimates of future climate-change impacts on the carbon cycle, but this will require several important knowledge gaps to be filled before resprouting can be properly implemented.
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