A New Process-Based Soil Methane Scheme: Evaluation Over Arctic Field Sites With the ISBA Land Surface Model
International audience Permafrost soils and arctic wetlands methane emissions represent an important challenge for modeling the future climate. Here we present a process-based model designed to correctly represent the main thermal, hydrological, and biogeochemical processes related to these emission...
Published in: | Journal of Advances in Modeling Earth Systems |
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Main Authors: | , , , , , |
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Format: | Article in Journal/Newspaper |
Language: | English |
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HAL CCSD
2019
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Online Access: | https://hal.science/hal-02105138 https://hal.science/hal-02105138/document https://hal.science/hal-02105138/file/2018MS001329.pdf https://doi.org/10.1029/2018MS001329 |
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Institut national des sciences de l'Univers: HAL-INSU |
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English |
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[SDU.OCEAN]Sciences of the Universe [physics]/Ocean Atmosphere |
spellingShingle |
[SDU.OCEAN]Sciences of the Universe [physics]/Ocean Atmosphere Morel, X. Decharme, B. Delire, C. Krinner, G. Hansen, B. Lund, M. A New Process-Based Soil Methane Scheme: Evaluation Over Arctic Field Sites With the ISBA Land Surface Model |
topic_facet |
[SDU.OCEAN]Sciences of the Universe [physics]/Ocean Atmosphere |
description |
International audience Permafrost soils and arctic wetlands methane emissions represent an important challenge for modeling the future climate. Here we present a process-based model designed to correctly represent the main thermal, hydrological, and biogeochemical processes related to these emissions for general land surface modeling. We propose a new multilayer soil carbon and gas module within the Interaction Soil-Biosphere-Atmosphere (ISBA) land-surface model (LSM). This module represents carbon pools, vertical carbon dynamics, and both oxic and anoxic organic matter decomposition. It also represents the soil gas processes for CH 4 , CO 2 , and O 2 through the soil column. We base CH 4 production and oxydation on an O 2 control instead of the classical water table level strata approach used in state-of-the-art soil CH 4 models. We propose a new parametrization of CH 4 oxydation using recent field experiments and use an explicit O 2 limitation for soil carbon decomposition. Soil gas transport is computed explicitly, using a revisited formulation of plant-mediated transport, a new representation of gas bulk diffusivity in porous media closer to experimental observations, and an innovative advection term for ebullition. We evaluate this advanced model on three climatically distinct sites : two in Greenland (Nuuk and Zackenberg) and one in Siberia (Chokurdakh). The model realistically reproduces methane and carbon dioxide emissions from both permafrosted and nonpermafrosted sites. The evolution and vertical characteristics of the underground processes leading to these fluxes are consistent with current knowledge. Results also show that physics is the main driver of methane fluxes, and the main source of variability appears to be the water table depth. |
author2 |
Centre national de recherches météorologiques (CNRM) Institut national des sciences de l'Univers (INSU - CNRS)-Observatoire Midi-Pyrénées (OMP) Institut de Recherche pour le Développement (IRD)-Université Toulouse III - Paul Sabatier (UT3) Université de Toulouse (UT)-Université de Toulouse (UT)-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National d'Études Spatiales Toulouse (CNES)-Centre National de la Recherche Scientifique (CNRS)-Météo-France-Institut de Recherche pour le Développement (IRD)-Université Toulouse III - Paul Sabatier (UT3) Université de Toulouse (UT)-Université de Toulouse (UT)-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National d'Études Spatiales Toulouse (CNES)-Centre National de la Recherche Scientifique (CNRS)-Météo-France-Centre National de la Recherche Scientifique (CNRS) Institut des Géosciences de l’Environnement (IGE) Institut de Recherche pour le Développement (IRD)-Institut polytechnique de Grenoble - Grenoble Institute of Technology (Grenoble INP )-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National de la Recherche Scientifique (CNRS)-Université Grenoble Alpes 2016-2019 (UGA 2016-2019 ) |
format |
Article in Journal/Newspaper |
author |
Morel, X. Decharme, B. Delire, C. Krinner, G. Hansen, B. Lund, M. |
author_facet |
Morel, X. Decharme, B. Delire, C. Krinner, G. Hansen, B. Lund, M. |
author_sort |
Morel, X. |
title |
A New Process-Based Soil Methane Scheme: Evaluation Over Arctic Field Sites With the ISBA Land Surface Model |
title_short |
A New Process-Based Soil Methane Scheme: Evaluation Over Arctic Field Sites With the ISBA Land Surface Model |
title_full |
A New Process-Based Soil Methane Scheme: Evaluation Over Arctic Field Sites With the ISBA Land Surface Model |
title_fullStr |
A New Process-Based Soil Methane Scheme: Evaluation Over Arctic Field Sites With the ISBA Land Surface Model |
title_full_unstemmed |
A New Process-Based Soil Methane Scheme: Evaluation Over Arctic Field Sites With the ISBA Land Surface Model |
title_sort |
new process-based soil methane scheme: evaluation over arctic field sites with the isba land surface model |
publisher |
HAL CCSD |
publishDate |
2019 |
url |
https://hal.science/hal-02105138 https://hal.science/hal-02105138/document https://hal.science/hal-02105138/file/2018MS001329.pdf https://doi.org/10.1029/2018MS001329 |
genre |
Arctic Greenland Nuuk permafrost Zackenberg Siberia |
genre_facet |
Arctic Greenland Nuuk permafrost Zackenberg Siberia |
op_source |
ISSN: 1942-2466 Journal of Advances in Modeling Earth Systems https://hal.science/hal-02105138 Journal of Advances in Modeling Earth Systems, 2019, 11 (1), pp.293-326. ⟨10.1029/2018MS001329⟩ |
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info:eu-repo/semantics/altIdentifier/doi/10.1029/2018MS001329 hal-02105138 https://hal.science/hal-02105138 https://hal.science/hal-02105138/document https://hal.science/hal-02105138/file/2018MS001329.pdf doi:10.1029/2018MS001329 |
op_rights |
info:eu-repo/semantics/OpenAccess |
op_doi |
https://doi.org/10.1029/2018MS001329 |
container_title |
Journal of Advances in Modeling Earth Systems |
container_volume |
11 |
container_issue |
1 |
container_start_page |
293 |
op_container_end_page |
326 |
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1797577958537297920 |
spelling |
ftinsu:oai:HAL:hal-02105138v1 2024-04-28T08:09:42+00:00 A New Process-Based Soil Methane Scheme: Evaluation Over Arctic Field Sites With the ISBA Land Surface Model Morel, X. Decharme, B. Delire, C. Krinner, G. Hansen, B. Lund, M. Centre national de recherches météorologiques (CNRM) Institut national des sciences de l'Univers (INSU - CNRS)-Observatoire Midi-Pyrénées (OMP) Institut de Recherche pour le Développement (IRD)-Université Toulouse III - Paul Sabatier (UT3) Université de Toulouse (UT)-Université de Toulouse (UT)-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National d'Études Spatiales Toulouse (CNES)-Centre National de la Recherche Scientifique (CNRS)-Météo-France-Institut de Recherche pour le Développement (IRD)-Université Toulouse III - Paul Sabatier (UT3) Université de Toulouse (UT)-Université de Toulouse (UT)-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National d'Études Spatiales Toulouse (CNES)-Centre National de la Recherche Scientifique (CNRS)-Météo-France-Centre National de la Recherche Scientifique (CNRS) Institut des Géosciences de l’Environnement (IGE) Institut de Recherche pour le Développement (IRD)-Institut polytechnique de Grenoble - Grenoble Institute of Technology (Grenoble INP )-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National de la Recherche Scientifique (CNRS)-Université Grenoble Alpes 2016-2019 (UGA 2016-2019 ) 2019-01 https://hal.science/hal-02105138 https://hal.science/hal-02105138/document https://hal.science/hal-02105138/file/2018MS001329.pdf https://doi.org/10.1029/2018MS001329 en eng HAL CCSD American Geophysical Union info:eu-repo/semantics/altIdentifier/doi/10.1029/2018MS001329 hal-02105138 https://hal.science/hal-02105138 https://hal.science/hal-02105138/document https://hal.science/hal-02105138/file/2018MS001329.pdf doi:10.1029/2018MS001329 info:eu-repo/semantics/OpenAccess ISSN: 1942-2466 Journal of Advances in Modeling Earth Systems https://hal.science/hal-02105138 Journal of Advances in Modeling Earth Systems, 2019, 11 (1), pp.293-326. ⟨10.1029/2018MS001329⟩ [SDU.OCEAN]Sciences of the Universe [physics]/Ocean Atmosphere info:eu-repo/semantics/article Journal articles 2019 ftinsu https://doi.org/10.1029/2018MS001329 2024-04-05T00:40:08Z International audience Permafrost soils and arctic wetlands methane emissions represent an important challenge for modeling the future climate. Here we present a process-based model designed to correctly represent the main thermal, hydrological, and biogeochemical processes related to these emissions for general land surface modeling. We propose a new multilayer soil carbon and gas module within the Interaction Soil-Biosphere-Atmosphere (ISBA) land-surface model (LSM). This module represents carbon pools, vertical carbon dynamics, and both oxic and anoxic organic matter decomposition. It also represents the soil gas processes for CH 4 , CO 2 , and O 2 through the soil column. We base CH 4 production and oxydation on an O 2 control instead of the classical water table level strata approach used in state-of-the-art soil CH 4 models. We propose a new parametrization of CH 4 oxydation using recent field experiments and use an explicit O 2 limitation for soil carbon decomposition. Soil gas transport is computed explicitly, using a revisited formulation of plant-mediated transport, a new representation of gas bulk diffusivity in porous media closer to experimental observations, and an innovative advection term for ebullition. We evaluate this advanced model on three climatically distinct sites : two in Greenland (Nuuk and Zackenberg) and one in Siberia (Chokurdakh). The model realistically reproduces methane and carbon dioxide emissions from both permafrosted and nonpermafrosted sites. The evolution and vertical characteristics of the underground processes leading to these fluxes are consistent with current knowledge. Results also show that physics is the main driver of methane fluxes, and the main source of variability appears to be the water table depth. Article in Journal/Newspaper Arctic Greenland Nuuk permafrost Zackenberg Siberia Institut national des sciences de l'Univers: HAL-INSU Journal of Advances in Modeling Earth Systems 11 1 293 326 |