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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-2018-256
© Author(s) 2018. This work is distributed under
the Creative Commons Attribution 4.0 License.
https://doi.org/10.5194/gmd-2018-256
© Author(s) 2018. This work is distributed under
the Creative Commons Attribution 4.0 License.

Model description paper 29 Nov 2018

Model description paper | 29 Nov 2018

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

Modelling northern peatlands area and carbon dynamics since the Holocene with the ORCHIDEE-PEAT land surface model (SVN r5488)

Chunjing Qiu1, Dan Zhu1, Philippe Ciais1, Bertrand Guenet1, Shushi Peng2, Gerhard Krinner3, Ardalan Tootchi4, Agnès Ducharne4, and Adam Hastie5 Chunjing Qiu et al.
  • 1Laboratoire des Sciences du Climat et de l'Environnement, UMR8212, CEA-CNRS-UVSQ 691191 Gif sur Yvette, France
  • 2Sino-French Institute for Earth System Science, College of Urban and Environmental Sciences, Peking University, 100871 Beijing, China
  • 3CNRS, Université Grenoble Alpes, Institut de Géosciences de l'Environnement (IGE), 38000 Grenoble, France
  • 4Sorbonne Université, CNRS, EPHE, Milieux environnementaux, transferts et interaction dans les hydrosystèmes et les sols, Metis, 75005 Paris, France
  • 5Department of Geoscience, Environment and Society, Université Libre de Bruxelles, 1050 Bruxelles, Belgium

Abstract. The importance of northern peatlands in the global carbon cycle has recently been recognized, especially for long-term changes. Yet, the complex interactions between climate and peatland hydrology, carbon storage and area dynamics make it challenging to represent these systems in land surface models. This study describes how peatland are included as an independent sub-grid hydrological soil unit (HSU) into the ORCHIDEE-MICT land surface model. The peatland soil column in this tile is characterized by multi-layered vertical water and carbon transport, and peat-specific hydrological properties. A cost-efficient TOPMODEL approach is implemented to simulate the dynamics of peatland area, calibrated by present-day wetland areas that are regularly inundated or subject to shallow water tables. The model is tested across a range of northern peatland sites and for gridded simulations over the Northern Hemisphere (>30°N). Simulated northern peatland area (3.9millionkm2), peat carbon stock (463PgC) and peat depth are generally consistent with observed estimates of peatland area (3.4–4.0millionkm2), peat carbon (270–540PgC) and data compilations of peat core depths. Our results show that both net primary production (NPP) and heterotrophic respiration (HR) of northern peatlands increased over the past century in response to CO2 and climate change. NPP increased more rapidly than HR, and thus net ecosystem production (NEP) exhibited a positive trend, contributing a cumulative carbon storage of 11.13PgC since 1901, most of it being realized after the 1950s.

Chunjing Qiu et al.
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We present a model that can simulate the dynamics of peatland area extent and the vertical buildup of peat within the ORCHIDEE-MICT land surface model. The model is validated across a range of northern peatland sites and over the Northern Hemisphere (> 30° N). It is able to reproduce the spatial extent of northern peatlands and peat carbon accumulation over the Holocene.
We present a model that can simulate the dynamics of peatland area extent and the vertical...
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