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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-2018-320
© Author(s) 2019. This work is distributed under
the Creative Commons Attribution 4.0 License.
https://doi.org/10.5194/gmd-2018-320
© Author(s) 2019. This work is distributed under
the Creative Commons Attribution 4.0 License.

Model evaluation paper 25 Mar 2019

Model evaluation paper | 25 Mar 2019

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

ORCHIDEE MICT-LEAK (r5459), a global model for the production, transport and transformation of dissolved organic carbon from Arctic permafrost regions, Part 1: Rationale, model description and simulation protocol

Simon P. K. Bowring1, Ronny Lauerwald2, Bertrand Guenet1, Dan Zhu1, Matthieu Guimberteau1,3, Ardalan Tootchi3, Agnès Ducharne3, and Philippe Ciais1 Simon P. K. Bowring et al.
  • 1Laboratoire des Sciences du Climat et de l'Environnement, LSCE,CEA,CNRS,UVSQ, 91191 Gif Sur Yvette, France
  • 2Department of Geoscience, Environment & Society, Université Libre de Bruxelles,1050 Bruxelles, Belgium
  • 3Sorbonne Université, CNRS, EPHE, Milieux environnementaux, transferts et interaction dans les hydrosystèmes et les sols, Metis, 75005 Paris, France

Abstract. Few Earth System models adequately represent the unique permafrost soil biogeochemistry and its respective processes; this significantly contributes to uncertainty in estimating their responses, and that of the planet at large, to warming. Likewise, the riverine component of what is known as the "boundless carbon cycle" is seldom recognized in Earth System modeling. Hydrological mobilization of organic material from a ~ 1330–1580 PgC carbon stock to the river network results either in sedimentary settling or atmospheric "evasion", processes widely expected to increase with amplified Arctic climate warming. Here, the production, transport and atmospheric release of dissolved organic carbon (DOC) from high-latitude permafrost soils into inland waters and the ocean is explicitly represented for the first time in the land surface component (ORCHIDEE) of a CMIP6 global climate model (IPSL). The model, ORCHIDEE MICT-LEAK, mechanistically represents (a) vegetation and soil physical processes for high latitude snow, ice and soil phenomena, and (b) the cycling of DOC and CO2, including atmospheric evasion, along the terrestrial-aquatic continuum from soils through the river network to the coast, at 0.5° to 2° resolution. This paper, the first in a two-part study, presents the rationale for including these processes in a high latitude specific land surface model, then describes the model with a focus on novel process implementations, followed by a summary of the model configuration and simulation protocol. The results of these simulation runs, conducted for the Lena River basin, are evaluated against observational data in the second part of this study.

Simon P. K. Bowring et al.
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Simon P. K. Bowring et al.
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Short summary
Few Earth System models represent permafrost soil biogeochemistry, contributing to uncertainty in estimating its response, and that of the planet to warming. Because the permafrost contains over double the carbon in the present atmosphere, its fate as it is 'unlocked' by warming is globally significant. One way that it can be mobilised is into rivers, then sea or atmosphere: a vector previously ignored in climate modelling. We present a model scheme for resolving this vector at global scale.
Few Earth System models represent permafrost soil biogeochemistry, contributing to uncertainty...
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