Representation of fire, land-use change and vegetation dynamics in the Joint UK Land Environment Simulator vn4.9 (JULES)
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Published:2019-01-09
Issue:1
Volume:12
Page:179-193
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ISSN:1991-9603
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Container-title:Geoscientific Model Development
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language:en
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Short-container-title:Geosci. Model Dev.
Author:
Burton ChantelleORCID, Betts Richard, Cardoso ManoelORCID, Feldpausch Ted R.ORCID, Harper AnnaORCID, Jones Chris D.ORCID, Kelley Douglas I.ORCID, Robertson Eddy, Wiltshire Andy
Abstract
Abstract. Disturbance of vegetation is a critical component of land cover,
but is generally poorly constrained in land surface and carbon cycle models.
In particular, land-use change and fire can be treated as large-scale
disturbances without full representation of their underlying complexities and
interactions. Here we describe developments to the land surface model JULES
(Joint UK Land Environment Simulator) to represent land-use change and fire
as distinct processes which interact with simulated vegetation dynamics. We
couple the fire model INFERNO (INteractive Fire and Emission algoRithm for
Natural envirOnments) to dynamic vegetation within JULES and use the HYDE
(History Database of the Global Environment) land cover dataset to analyse
the impact of land-use change on the simulation of present day vegetation. We
evaluate the inclusion of land use and fire disturbance against standard
benchmarks. Using the Manhattan metric, results show improved simulation of
vegetation cover across all observed datasets. Overall, disturbance improves
the simulation of vegetation cover by 35 % compared to vegetation
continuous field (VCF) observations from MODIS and 13 % compared to the
Climate Change Initiative (CCI) from the ESA. Biases in grass extent are reduced
from −66 % to 13 %. Total woody cover improves by 55 % compared
to VCF and 20 % compared to CCI from a reduction in forest extent in the
tropics, although simulated tree cover is now too sparse in some areas.
Explicitly modelling fire and land use generally decreases tree and shrub
cover and increases grasses. The results show that the disturbances provide
important contributions to the realistic modelling of vegetation on a global
scale, although in some areas fire and land use together result in too much
disturbance. This work provides a substantial contribution towards
representing the full complexity and interactions between land-use change and
fire that could be used in Earth system models.
Publisher
Copernicus GmbH
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