Observation and in-situ modeling of boreal soil carbon and associated methane emissions
The methane is one of the most powerful greenhouse gases in the atmosphere, with the carbon dioxyde and the water vapour. At the global scale, most of natural methane emissions come from high latitude wetlands and permafrosts. These regions accounts for a large part of terrestrial carbon stocks. In...
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Other Authors: | , , , , , , , , |
Format: | Doctoral or Postdoctoral Thesis |
Language: | French |
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HAL CCSD
2018
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Online Access: | https://hal.science/tel-02188590 https://hal.science/tel-02188590/document https://hal.science/tel-02188590/file/Master.pdf |
id |
ftmeteofrance:oai:HAL:tel-02188590v1 |
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record_format |
openpolar |
institution |
Open Polar |
collection |
Météo-France: HAL |
op_collection_id |
ftmeteofrance |
language |
French |
topic |
permafrost soil carbon modeling greenhouse gas boreal ecosystems pergélisol méthane carbone du sol modélisation gas à effet de serre écosystèmes boréaux [SDU.ENVI]Sciences of the Universe [physics]/Continental interfaces environment [SDU.OCEAN]Sciences of the Universe [physics]/Ocean Atmosphere |
spellingShingle |
permafrost soil carbon modeling greenhouse gas boreal ecosystems pergélisol méthane carbone du sol modélisation gas à effet de serre écosystèmes boréaux [SDU.ENVI]Sciences of the Universe [physics]/Continental interfaces environment [SDU.OCEAN]Sciences of the Universe [physics]/Ocean Atmosphere Morel, Xavier Observation and in-situ modeling of boreal soil carbon and associated methane emissions |
topic_facet |
permafrost soil carbon modeling greenhouse gas boreal ecosystems pergélisol méthane carbone du sol modélisation gas à effet de serre écosystèmes boréaux [SDU.ENVI]Sciences of the Universe [physics]/Continental interfaces environment [SDU.OCEAN]Sciences of the Universe [physics]/Ocean Atmosphere |
description |
The methane is one of the most powerful greenhouse gases in the atmosphere, with the carbon dioxyde and the water vapour. At the global scale, most of natural methane emissions come from high latitude wetlands and permafrosts. These regions accounts for a large part of terrestrial carbon stocks. In a climate change context, their future is highly uncertain, like the associated greenhouse gas emissions. Understanding the biogoechemical processes leading to methane fluxes and their interactions with surface processes is therefore important.One of the objectives of this thesis is to represent methane fluxes from these regions within the land surface model ISBA. To do so, we developped a biogeochemical model that represents explicitely gases, their production, consumption and transport within the soil column. This model is coupled with a new dynamic soil carbon model, vertically discretized, also developed during this thesis. The new biogeochemical model represents correctly methane and carbon dioxyde fluxes on three distinct arctic sites, with or without permafrost. The representation of underground biogeochemical processes is also satisfying. Nevertheless, some parameters remain uncertain and the model is very sensitive to hydrological conditions.\\We also measured soil carbon stocks and profiles in one of the Greenlandic studied fen. Comparing these stocks and profiles with the modelled carbon stocks shows some shortcomings of the new discretized soil carbon model : CENTURY original structure and parametrisation is not perfectly suited for high-latitudes wetlands, and the representation of carbon vertical dynamics needs improvements. Le méthane est l'un des plus puissants gaz à effets de serre présent dans l'atmosphère, avec le dioxyde de carbone et la vapeur d'eau. A l'échelle globale, la majorité des émissions naturelles de méthane proviennent des zones humides et des pergélisols de haute latitude. Ces zones sont un réservoir important de carbone et dans un contexte de changement climatique, leur devenir est ... |
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) Université Toulouse 3 Paul Sabatier Bertrand Decharme Christine Delire Gerhard Krinner |
format |
Doctoral or Postdoctoral Thesis |
author |
Morel, Xavier |
author_facet |
Morel, Xavier |
author_sort |
Morel, Xavier |
title |
Observation and in-situ modeling of boreal soil carbon and associated methane emissions |
title_short |
Observation and in-situ modeling of boreal soil carbon and associated methane emissions |
title_full |
Observation and in-situ modeling of boreal soil carbon and associated methane emissions |
title_fullStr |
Observation and in-situ modeling of boreal soil carbon and associated methane emissions |
title_full_unstemmed |
Observation and in-situ modeling of boreal soil carbon and associated methane emissions |
title_sort |
observation and in-situ modeling of boreal soil carbon and associated methane emissions |
publisher |
HAL CCSD |
publishDate |
2018 |
url |
https://hal.science/tel-02188590 https://hal.science/tel-02188590/document https://hal.science/tel-02188590/file/Master.pdf |
geographic |
Arctic |
geographic_facet |
Arctic |
genre |
Arctic Climate change greenlandic permafrost pergélisol |
genre_facet |
Arctic Climate change greenlandic permafrost pergélisol |
op_source |
https://hal.science/tel-02188590 Interfaces continentales, environnement. Université Toulouse 3 Paul Sabatier, 2018. Français. ⟨NNT : ⟩ |
op_relation |
tel-02188590 https://hal.science/tel-02188590 https://hal.science/tel-02188590/document https://hal.science/tel-02188590/file/Master.pdf |
op_rights |
info:eu-repo/semantics/OpenAccess |
_version_ |
1785578443343134720 |
spelling |
ftmeteofrance:oai:HAL:tel-02188590v1 2023-12-17T10:26:43+01:00 Observation and in-situ modeling of boreal soil carbon and associated methane emissions Observation et modélisation in-situ du carbone des sols boréaux et des émissions de méthane associées Morel, Xavier 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) Université Toulouse 3 Paul Sabatier Bertrand Decharme Christine Delire Gerhard Krinner 2018-06-28 https://hal.science/tel-02188590 https://hal.science/tel-02188590/document https://hal.science/tel-02188590/file/Master.pdf fr fre HAL CCSD tel-02188590 https://hal.science/tel-02188590 https://hal.science/tel-02188590/document https://hal.science/tel-02188590/file/Master.pdf info:eu-repo/semantics/OpenAccess https://hal.science/tel-02188590 Interfaces continentales, environnement. Université Toulouse 3 Paul Sabatier, 2018. Français. ⟨NNT : ⟩ permafrost soil carbon modeling greenhouse gas boreal ecosystems pergélisol méthane carbone du sol modélisation gas à effet de serre écosystèmes boréaux [SDU.ENVI]Sciences of the Universe [physics]/Continental interfaces environment [SDU.OCEAN]Sciences of the Universe [physics]/Ocean Atmosphere info:eu-repo/semantics/doctoralThesis Theses 2018 ftmeteofrance 2023-11-21T23:44:54Z The methane is one of the most powerful greenhouse gases in the atmosphere, with the carbon dioxyde and the water vapour. At the global scale, most of natural methane emissions come from high latitude wetlands and permafrosts. These regions accounts for a large part of terrestrial carbon stocks. In a climate change context, their future is highly uncertain, like the associated greenhouse gas emissions. Understanding the biogoechemical processes leading to methane fluxes and their interactions with surface processes is therefore important.One of the objectives of this thesis is to represent methane fluxes from these regions within the land surface model ISBA. To do so, we developped a biogeochemical model that represents explicitely gases, their production, consumption and transport within the soil column. This model is coupled with a new dynamic soil carbon model, vertically discretized, also developed during this thesis. The new biogeochemical model represents correctly methane and carbon dioxyde fluxes on three distinct arctic sites, with or without permafrost. The representation of underground biogeochemical processes is also satisfying. Nevertheless, some parameters remain uncertain and the model is very sensitive to hydrological conditions.\\We also measured soil carbon stocks and profiles in one of the Greenlandic studied fen. Comparing these stocks and profiles with the modelled carbon stocks shows some shortcomings of the new discretized soil carbon model : CENTURY original structure and parametrisation is not perfectly suited for high-latitudes wetlands, and the representation of carbon vertical dynamics needs improvements. Le méthane est l'un des plus puissants gaz à effets de serre présent dans l'atmosphère, avec le dioxyde de carbone et la vapeur d'eau. A l'échelle globale, la majorité des émissions naturelles de méthane proviennent des zones humides et des pergélisols de haute latitude. Ces zones sont un réservoir important de carbone et dans un contexte de changement climatique, leur devenir est ... Doctoral or Postdoctoral Thesis Arctic Climate change greenlandic permafrost pergélisol Météo-France: HAL Arctic |