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Geoscientific Model Development An interactive open-access journal of the European Geosciences Union
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Discussion papers
https://doi.org/10.5194/gmd-2019-205
© Author(s) 2019. This work is distributed under
the Creative Commons Attribution 4.0 License.
https://doi.org/10.5194/gmd-2019-205
© Author(s) 2019. This work is distributed under
the Creative Commons Attribution 4.0 License.

Submitted as: model description paper 17 Sep 2019

Submitted as: model description paper | 17 Sep 2019

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This discussion paper is a preprint. It is a manuscript under review for the journal Geoscientific Model Development (GMD).

CARBON-DISC 1.0 – A coupled, process-based model of global in-stream carbon biogeochemistry

Wim Joost van Hoek1, Lauriane Vilmin1, Arthur H. W. Beusen1,2, José M. Mogollón4, Xiaochen Liu1, Joep J. Langeveld1, Alexander F. Bouwman1,2,3, and Jack J. Middelburg1 Wim Joost van Hoek et al.
  • 1Department of Earth Sciences, Utrecht University, P.O. Box 80021, 3508TA Utrecht, the Netherlands
  • 2PBL Netherlands Environmental Assessment Agency, P.O. Box 30314, 2500GH the Hague, the Netherlands
  • 3Laboratory of Marine Chemistry Theory and Technology, Ministry of Education, Ocean University of China, Qingdao 266100, PR China
  • 4Department of Industrial Ecology, Leiden University, P.O. Box 9518, 2300RA Leiden, the Netherlands

Abstract. Here, we present the implementation of the freshwater carbon (C) cycle in the Dynamic In-stream Chemistry module (CARBON-DISC), which is part of the Integrated Model to Assess the Global Environment-Dynamic Global Nutrient Model (IMAGE-DGNM). A coupled hydrology-biogeochemistry approach with 0.5 by 0.5-degree resolution accounts for the spatial and temporal variability in dynamic conditions in the aquatic continuum using independent global databases. This process-based model resolves the concentrations, transformations and transfer fluxes of dissolved inorganic carbon (DIC), dissolved organic carbon (DOC) and terrestrial and autochthonous particulate organic carbon (POC) from headwaters to river mouth with a time step of 1 month for the period 1950–2000.

This is a major step forward in basin scale modelling of the C processing in freshwater systems, since simulated results can be validated at every location and point in time, and the model can be applied for retrodiction and to analyse future scenarios. Validation of the model with long-term measurement data shows a fair agreement, considering that this is a global model. To analyse the performance of the full production-respiration DISC module, two other schemes are presented, including an abiotic system excluding any in-stream processing of DOC and allochthonous production, and an extended abiotic system including heterotrophic respiration, but excluding production. Furthermore, a sensitivity analysis shows that many parameters, such as temperature, solar radiation, organic sediment mineralization rate and C inputs, including particulate organic carbon from terrestrial vegetation and dissolved inorganic carbon from groundwater, strongly affect atmosphere-freshwater exchange of CO2.

Wim Joost van Hoek et al.
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Model code and software

CARBON-DISC_1.0 W. J. van Hoek, L. Vilmin, A. H. W. Beusen, J. M. Mogollón, X. Liu, J. J. Langeveld, A. F. Bouwman, and J. J. Middelburg https://doi.org/10.5281/zenodo.3402473

Wim Joost van Hoek et al.
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Short summary
In this study we present CARBON-DISC 1.0. It couples the global water balance model PCR-GLOBWB with global carbon inputs from the Integrated Model to Assess the Global Environment (IMAGE) at a 0.5° resolution and calculates gridcell-to-gridcell transport, C transformations, C emissions, C burial and primary production on a monthly timestep and without calibration.
In this study we present CARBON-DISC 1.0. It couples the global water balance model PCR-GLOBWB...
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