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Geoscientific Model Development An interactive open-access journal of the European Geosciences Union
https://doi.org/10.5194/gmd-2017-172
© Author(s) 2017. This work is distributed under
the Creative Commons Attribution 4.0 License.
Model description paper
24 Jul 2017
Review status
This discussion paper is a preprint. A revision of the manuscript is under review for the journal Geoscientific Model Development (GMD).
Representation of dissolved organic carbon in the JULES land surface model (vn4.4_JULES-DOCM)
Mahdi Nakhavali1, Pierre Friedlingstein1, Ronny Lauerwald1, Jing Tang2,3, Sarah Chadburn1,4, Marta Camino-Serrano5, Bertrand Guenet6, Anna Harper1, David Walmsley7, Matthias Peichl8, and Bert Gielen9 1University of Exeter, Exeter, EX4 4QE, UK
2Terrestrial Ecology Section, Department of Biology, University of Copenhagen, Copenhagen, Denmark
3Centre for Permafrost, University of Copenhagen, Copenhagen, Denmark
4University of Leeds, School of Earth and Environment, Leeds, UK
5CREAF, Barcelona, Catalonia
6IPSL-LSCE, Gif-sur-Yvette, France
7Leuphana University Lüneburg, Germany
8Swedish University of Agricultural Sciences, Department of Forest Ecology and management, Umeå, Sweden
9University of Antwerp, Antwerp, Belgium
Abstract. Current global models of the carbon (C) cycle consider only vertical gas exchanges between terrestrial or oceanic reservoirs and the atmosphere, thus not considering lateral transport of carbon from the continents to the oceans. Therefore, those models implicitly consider that all the C which is not respired to the atmosphere is stored on land, hence overestimating the land C sink capability. A model that represents the whole continuum from atmosphere to land and into the ocean would provide better understanding of the Earth's C cycle and hence more reliable historical or future projections. We present an original representation of Dissolved Organic C (DOC) processes in the Joint UK Land Environment Simulator (JULES-DOCM). The standard version of JULES represents energy, water and carbon dynamics between vegetation, soil and atmosphere, while lateral fluxes only account for water run-off. Here we integrate a representation of DOC production in terrestrial ecosystems based on incomplete decomposition of organic matter, DOC decomposition within the soil column, and DOC export to the river network via leaching. The model performance is evaluated in five specific sites for which observations of soil DOC concentration are available. Results show that the model is able to reproduce the DOC concentration and controlling processes including leaching to the riverine system which is fundamental for integrating terrestrial and aquatic ecosystems.

Citation: Nakhavali, M., Friedlingstein, P., Lauerwald, R., Tang, J., Chadburn, S., Camino-Serrano, M., Guenet, B., Harper, A., Walmsley, D., Peichl, M., and Gielen, B.: Representation of dissolved organic carbon in the JULES land surface model (vn4.4_JULES-DOCM), Geosci. Model Dev. Discuss., https://doi.org/10.5194/gmd-2017-172, in review, 2017.
Mahdi Nakhavali et al.
Mahdi Nakhavali et al.
Mahdi Nakhavali et al.

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Short summary
In order to provide better understanding of the Earth's carbon cycle we need a model that represents the whole continuum from atmosphere to land and into the ocean. In this study we include in JULES a representation of Dissolved Organic Carbon (DOC) processes. Our results show that the model is able to reproduce the DOC concentration and controlling processes including leaching to the riverine system which is fundamental for integrating terrestrial and aquatic ecosystem.
In order to provide better understanding of the Earth's carbon cycle we need a model that...
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