Changing boreal methane sources and constant biomass burning during the last termination
International audience Past atmospheric methane concentrations show strong fluctuations in parallel to rapid glacial climate changes in the Northern Hemisphere superimposed on a glacial–interglacial doubling of methane concentrations. The processes driving the observed fluctuations remain uncertain...
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ftunigrenoble:oai:HAL:insu-00378409v1 2024-09-15T18:12:01+00:00 Changing boreal methane sources and constant biomass burning during the last termination Fischer, Hubertus Behrens, Melanie Bock, Michael Richter, Ulrike Schmitt, Jochen Loulergue, Laetitia Chappellaz, Jerome Spahni, Renato Blunier, Thomas Leuenberger, Markus Stocker, Thomas F. Abteilung Klinische Sozialmedizin, Berufs- und Umweltdermatologie Universität Heidelberg Heidelberg = Heidelberg University Laboratoire de glaciologie et géophysique de l'environnement (LGGE) Observatoire des Sciences de l'Univers de Grenoble (OSUG) Université Joseph Fourier - Grenoble 1 (UJF)-Institut polytechnique de Grenoble - Grenoble Institute of Technology (Grenoble INP )-Institut national des sciences de l'Univers (INSU - CNRS)-Institut national de recherche en sciences et technologies pour l'environnement et l'agriculture (IRSTEA)-Université Savoie Mont Blanc (USMB Université de Savoie Université de Chambéry )-Centre National de la Recherche Scientifique (CNRS)-Université Joseph Fourier - Grenoble 1 (UJF)-Institut polytechnique de Grenoble - Grenoble Institute of Technology (Grenoble INP )-Institut national des sciences de l'Univers (INSU - CNRS)-Institut national de recherche en sciences et technologies pour l'environnement et l'agriculture (IRSTEA)-Université Savoie Mont Blanc (USMB Université de Savoie Université de Chambéry )-Centre National de la Recherche Scientifique (CNRS)-Centre National de la Recherche Scientifique (CNRS) Climate and Environmental Physics Bern (CEP) Physikalisches Institut Bern Universität Bern = University of Bern = Université de Berne (UNIBE)-Universität Bern = University of Bern = Université de Berne (UNIBE) Centre for Ice and Climate Copenhagen Niels Bohr Institute Copenhagen (NBI) Faculty of Science Copenhagen University of Copenhagen = Københavns Universitet (UCPH)-University of Copenhagen = Københavns Universitet (UCPH)-Faculty of Science Copenhagen University of Copenhagen = Københavns Universitet (UCPH)-University of Copenhagen = Københavns Universitet (UCPH) 2008 https://insu.hal.science/insu-00378409 https://doi.org/10.1038/nature06825 en eng HAL CCSD Nature Publishing Group info:eu-repo/semantics/altIdentifier/doi/10.1038/nature06825 insu-00378409 https://insu.hal.science/insu-00378409 doi:10.1038/nature06825 ISSN: 0028-0836 EISSN: 1476-4687 Nature https://insu.hal.science/insu-00378409 Nature, 2008, 452 (7189), pp.864 à 867. ⟨10.1038/nature06825⟩ [SDU.STU.GL]Sciences of the Universe [physics]/Earth Sciences/Glaciology info:eu-repo/semantics/article Journal articles 2008 ftunigrenoble https://doi.org/10.1038/nature06825 2024-07-29T23:39:57Z International audience Past atmospheric methane concentrations show strong fluctuations in parallel to rapid glacial climate changes in the Northern Hemisphere superimposed on a glacial–interglacial doubling of methane concentrations. The processes driving the observed fluctuations remain uncertain but can be constrained using methane isotopic information from ice cores. Here we present an ice core record of carbon isotopic ratios in methane over the entire last glacial–interglacial transition. Our data show that the carbon in atmospheric methane was isotopically much heavier in cold climate periods. With the help of a box model constrained by the present data and previously published results we are able to estimate the magnitude of past individual methane emission sources and the atmospheric lifetime of methane. We find that methane emissions due to biomass burning were about 45 Tg methane per year, and that these remained roughly constant throughout the glacial termination. The atmospheric lifetime of methane is reduced during cold climate periods. We also show that boreal wetlands are an important source of methane during warm events, but their methane emissions are essentially shut down during cold climate conditions. Article in Journal/Newspaper ice core Université Grenoble Alpes: HAL Nature 452 7189 864 867 |
institution |
Open Polar |
collection |
Université Grenoble Alpes: HAL |
op_collection_id |
ftunigrenoble |
language |
English |
topic |
[SDU.STU.GL]Sciences of the Universe [physics]/Earth Sciences/Glaciology |
spellingShingle |
[SDU.STU.GL]Sciences of the Universe [physics]/Earth Sciences/Glaciology Fischer, Hubertus Behrens, Melanie Bock, Michael Richter, Ulrike Schmitt, Jochen Loulergue, Laetitia Chappellaz, Jerome Spahni, Renato Blunier, Thomas Leuenberger, Markus Stocker, Thomas F. Changing boreal methane sources and constant biomass burning during the last termination |
topic_facet |
[SDU.STU.GL]Sciences of the Universe [physics]/Earth Sciences/Glaciology |
description |
International audience Past atmospheric methane concentrations show strong fluctuations in parallel to rapid glacial climate changes in the Northern Hemisphere superimposed on a glacial–interglacial doubling of methane concentrations. The processes driving the observed fluctuations remain uncertain but can be constrained using methane isotopic information from ice cores. Here we present an ice core record of carbon isotopic ratios in methane over the entire last glacial–interglacial transition. Our data show that the carbon in atmospheric methane was isotopically much heavier in cold climate periods. With the help of a box model constrained by the present data and previously published results we are able to estimate the magnitude of past individual methane emission sources and the atmospheric lifetime of methane. We find that methane emissions due to biomass burning were about 45 Tg methane per year, and that these remained roughly constant throughout the glacial termination. The atmospheric lifetime of methane is reduced during cold climate periods. We also show that boreal wetlands are an important source of methane during warm events, but their methane emissions are essentially shut down during cold climate conditions. |
author2 |
Abteilung Klinische Sozialmedizin, Berufs- und Umweltdermatologie Universität Heidelberg Heidelberg = Heidelberg University Laboratoire de glaciologie et géophysique de l'environnement (LGGE) Observatoire des Sciences de l'Univers de Grenoble (OSUG) Université Joseph Fourier - Grenoble 1 (UJF)-Institut polytechnique de Grenoble - Grenoble Institute of Technology (Grenoble INP )-Institut national des sciences de l'Univers (INSU - CNRS)-Institut national de recherche en sciences et technologies pour l'environnement et l'agriculture (IRSTEA)-Université Savoie Mont Blanc (USMB Université de Savoie Université de Chambéry )-Centre National de la Recherche Scientifique (CNRS)-Université Joseph Fourier - Grenoble 1 (UJF)-Institut polytechnique de Grenoble - Grenoble Institute of Technology (Grenoble INP )-Institut national des sciences de l'Univers (INSU - CNRS)-Institut national de recherche en sciences et technologies pour l'environnement et l'agriculture (IRSTEA)-Université Savoie Mont Blanc (USMB Université de Savoie Université de Chambéry )-Centre National de la Recherche Scientifique (CNRS)-Centre National de la Recherche Scientifique (CNRS) Climate and Environmental Physics Bern (CEP) Physikalisches Institut Bern Universität Bern = University of Bern = Université de Berne (UNIBE)-Universität Bern = University of Bern = Université de Berne (UNIBE) Centre for Ice and Climate Copenhagen Niels Bohr Institute Copenhagen (NBI) Faculty of Science Copenhagen University of Copenhagen = Københavns Universitet (UCPH)-University of Copenhagen = Københavns Universitet (UCPH)-Faculty of Science Copenhagen University of Copenhagen = Københavns Universitet (UCPH)-University of Copenhagen = Københavns Universitet (UCPH) |
format |
Article in Journal/Newspaper |
author |
Fischer, Hubertus Behrens, Melanie Bock, Michael Richter, Ulrike Schmitt, Jochen Loulergue, Laetitia Chappellaz, Jerome Spahni, Renato Blunier, Thomas Leuenberger, Markus Stocker, Thomas F. |
author_facet |
Fischer, Hubertus Behrens, Melanie Bock, Michael Richter, Ulrike Schmitt, Jochen Loulergue, Laetitia Chappellaz, Jerome Spahni, Renato Blunier, Thomas Leuenberger, Markus Stocker, Thomas F. |
author_sort |
Fischer, Hubertus |
title |
Changing boreal methane sources and constant biomass burning during the last termination |
title_short |
Changing boreal methane sources and constant biomass burning during the last termination |
title_full |
Changing boreal methane sources and constant biomass burning during the last termination |
title_fullStr |
Changing boreal methane sources and constant biomass burning during the last termination |
title_full_unstemmed |
Changing boreal methane sources and constant biomass burning during the last termination |
title_sort |
changing boreal methane sources and constant biomass burning during the last termination |
publisher |
HAL CCSD |
publishDate |
2008 |
url |
https://insu.hal.science/insu-00378409 https://doi.org/10.1038/nature06825 |
genre |
ice core |
genre_facet |
ice core |
op_source |
ISSN: 0028-0836 EISSN: 1476-4687 Nature https://insu.hal.science/insu-00378409 Nature, 2008, 452 (7189), pp.864 à 867. ⟨10.1038/nature06825⟩ |
op_relation |
info:eu-repo/semantics/altIdentifier/doi/10.1038/nature06825 insu-00378409 https://insu.hal.science/insu-00378409 doi:10.1038/nature06825 |
op_doi |
https://doi.org/10.1038/nature06825 |
container_title |
Nature |
container_volume |
452 |
container_issue |
7189 |
container_start_page |
864 |
op_container_end_page |
867 |
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1810449604760567808 |