The Joint UK Land Environment Simulator (JULES), Model description – Part 2: Carbon fluxes and vegetation

Clark, D.B.; Mercado, L.M.; Sitch, S.; Jones, C.D.; Gedney, N.; Best, M.J.; Pryor, M.; Rooney, G.G.; Essery, R.L.H.; Blyth, E.; Boucher, O.; Harding, R.J.; Cox, P.M.. 2011 The Joint UK Land Environment Simulator (JULES), Model description – Part 2: Carbon fluxes and vegetation. Geoscientific Model Development Discussions, 4. 641-688. 10.5194/gmdd-4-641-2011

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The Joint UK Land Environment Simulator (JULES) is a process-based model that simulates the fluxes of carbon, water, energy and momentum between the land surface and the atmosphere. Past studies with JULES have demonstrated the important role of the land surface in the Earth System. Different versions of JULES have been employed to quantify the effects on the land carbon sink of separately changing atmospheric aerosols and tropospheric ozone, and the response of methane emissions from wetlands to climate change. There was a need to consolidate these and other advances into a single model code so as to be able to study interactions in a consistent manner. This paper describes the consolidation of these advances into the modelling of carbon fluxes and stores, in the vegetation and soil, in version 2.2 of JULES. Features include a multi-layer canopy scheme for light interception, including a sunfleck penetration scheme, a coupled scheme of leaf photosynthesis and stomatal conductance, representation of the effects of ozone on leaf physiology, and a description of methane emissions from wetlands. JULES represents the carbon allocation, growth and population dynamics of five plant functional types. The turnover of carbon from living plant tissues is fed into a 4-pool soil carbon model. The process-based descriptions of key ecological processes and trace gas fluxes in JULES mean that this community model is well-suited for use in carbon cycle, climate change and impacts studies, either in standalone mode or as the land component of a coupled Earth system model.

Item Type: Publication - Article
Digital Object Identifier (DOI): 10.5194/gmdd-4-641-2011
Programmes: CEH Topics & Objectives 2009 - 2012 > Water > WA Topic 3 - Science for Water Management > WA - 3.3 - Better represent hydrological and biogeochemical processes in Earth System Models
CEH Sections: Harding (to July 2011)
ISSN: 1991-9611
Additional Information. Not used in RCUK Gateway to Research.: Geoscientific Model Development Discussions is an Open Access journal. Please click on the OFFICIAL URL link to access full text
Date made live: 31 Mar 2011 10:25

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