Journal cover Journal topic
Geoscientific Model Development An interactive open-access journal of the European Geosciences Union
Geosci. Model Dev., 11, 593-609, 2018
https://doi.org/10.5194/gmd-11-593-2018
© Author(s) 2018. This work is distributed under
the Creative Commons Attribution 4.0 License.
Model description paper
12 Feb 2018
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 1College of Engineering, Mathematics, and Physical Sciences, University 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, Spain
6Laboratoire des Sciences du Climat et de l'Environnement, LSCE/IPSL, CEA-CNRS-UVSQ, Université Paris-Saclay, 91191 Gif-sur-Yvette, France
7Leuphana University Lüneburg, Lüneburg, Germany
8Swedish University of Agricultural Sciences, Department of Forest Ecology and management, Umeå, Sweden
9Department of Biology, Research Group of Plant and Vegetation Ecology, University 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 the lateral transport of carbon from the continents to the oceans. Therefore, those models implicitly consider all of the C which is not respired to the atmosphere to be stored on land and hence overestimate the land C sink capability. A model that represents the whole continuum from atmosphere to land and into the ocean would provide a better understanding of the Earth's C cycle and hence more reliable historical or future projections. A first and critical step in that direction is to include processes representing the production and export of dissolved organic carbon in soils. Here we present an original representation of dissolved organic C (DOC) processes in the Joint UK Land Environment Simulator (JULES-DOCM) that integrates a representation of DOC production in terrestrial ecosystems based on the 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. Future work should include the fate of exported DOC in the river system as well as DIC and POC export from soil.
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., 11, 593-609, https://doi.org/10.5194/gmd-11-593-2018, 2018.
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In order to provide a 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 the terrestrial and aquatic ecosystem.
In order to provide a better understanding of the Earth's carbon cycle, we need a model that...
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