Atmospheric methane variability: Centennial-scale signals in the Last Glacial Period
International audience In order to understand atmospheric methane (CH 4 ) biogeochemistry now and in the future, we must apprehend its natural variability, without anthropogenic influence. Samples of ancient air trapped within ice cores provide the means to do this. Here we analyze the ultrahigh-res...
Published in: | Global Biogeochemical Cycles |
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Online Access: | https://insu.hal.science/insu-03706527 https://insu.hal.science/insu-03706527/document https://insu.hal.science/insu-03706527/file/Global%20Biogeochemical%20Cycles%20-%202017%20-%20Rhodes%20-%20Atmospheric%20methane%20variability%20Centennial%25u2010scale%20signals%20in%20the%20Last.pdf https://doi.org/10.1002/2016GB005570 |
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ftinsu:oai:HAL:insu-03706527v1 2024-04-28T07:57:15+00:00 Atmospheric methane variability: Centennial-scale signals in the Last Glacial Period Rhodes, Rachael H. Brook, Edward J. Mcconnell, Joseph R. Blunier, Thomas Sime, Louise C. Faïn, Xavier Mulvaney, Robert 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 ) 2017 https://insu.hal.science/insu-03706527 https://insu.hal.science/insu-03706527/document https://insu.hal.science/insu-03706527/file/Global%20Biogeochemical%20Cycles%20-%202017%20-%20Rhodes%20-%20Atmospheric%20methane%20variability%20Centennial%25u2010scale%20signals%20in%20the%20Last.pdf https://doi.org/10.1002/2016GB005570 en eng HAL CCSD American Geophysical Union info:eu-repo/semantics/altIdentifier/doi/10.1002/2016GB005570 insu-03706527 https://insu.hal.science/insu-03706527 https://insu.hal.science/insu-03706527/document https://insu.hal.science/insu-03706527/file/Global%20Biogeochemical%20Cycles%20-%202017%20-%20Rhodes%20-%20Atmospheric%20methane%20variability%20Centennial%25u2010scale%20signals%20in%20the%20Last.pdf BIBCODE: 2017GBioC.31.575R doi:10.1002/2016GB005570 http://hal.archives-ouvertes.fr/licences/copyright/ info:eu-repo/semantics/OpenAccess ISSN: 0886-6236 EISSN: 1944-8224 Global Biogeochemical Cycles https://insu.hal.science/insu-03706527 Global Biogeochemical Cycles, 2017, 31, pp.575-590. ⟨10.1002/2016GB005570⟩ methane ice cores centennial variability Last Glacial Period atmospheric composition paleoclimate [SDU]Sciences of the Universe [physics] info:eu-repo/semantics/article Journal articles 2017 ftinsu https://doi.org/10.1002/2016GB005570 2024-04-05T00:32:43Z International audience In order to understand atmospheric methane (CH 4 ) biogeochemistry now and in the future, we must apprehend its natural variability, without anthropogenic influence. Samples of ancient air trapped within ice cores provide the means to do this. Here we analyze the ultrahigh-resolution CH 4 record of the West Antarctic Ice Sheet Divide ice core 67.2-9.8 ka and find novel, atmospheric CH 4 variability at centennial time scales throughout the record. This signal is characterized by recurrence intervals within a broad 80-500 year range, but we find that age-scale uncertainties complicate the possible isolation of any periodic frequency. Lower signal amplitudes in the Last Glacial relative to the Holocene may be related to incongruent effects of firn-based signal smoothing processes. Within interstadial and stadial periods, the peak-to-peak signal amplitudes vary in proportion to the underlying millennial-scale oscillations in CH 4 concentration—the relative amplitude change is constant. We propose that the centennial CH 4 signal is related to tropical climate variability that influences predominantly low-latitude wetland CH 4 emissions. Article in Journal/Newspaper Antarc* Antarctic ice core Ice Sheet Institut national des sciences de l'Univers: HAL-INSU Global Biogeochemical Cycles 31 3 575 590 |
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Open Polar |
collection |
Institut national des sciences de l'Univers: HAL-INSU |
op_collection_id |
ftinsu |
language |
English |
topic |
methane ice cores centennial variability Last Glacial Period atmospheric composition paleoclimate [SDU]Sciences of the Universe [physics] |
spellingShingle |
methane ice cores centennial variability Last Glacial Period atmospheric composition paleoclimate [SDU]Sciences of the Universe [physics] Rhodes, Rachael H. Brook, Edward J. Mcconnell, Joseph R. Blunier, Thomas Sime, Louise C. Faïn, Xavier Mulvaney, Robert Atmospheric methane variability: Centennial-scale signals in the Last Glacial Period |
topic_facet |
methane ice cores centennial variability Last Glacial Period atmospheric composition paleoclimate [SDU]Sciences of the Universe [physics] |
description |
International audience In order to understand atmospheric methane (CH 4 ) biogeochemistry now and in the future, we must apprehend its natural variability, without anthropogenic influence. Samples of ancient air trapped within ice cores provide the means to do this. Here we analyze the ultrahigh-resolution CH 4 record of the West Antarctic Ice Sheet Divide ice core 67.2-9.8 ka and find novel, atmospheric CH 4 variability at centennial time scales throughout the record. This signal is characterized by recurrence intervals within a broad 80-500 year range, but we find that age-scale uncertainties complicate the possible isolation of any periodic frequency. Lower signal amplitudes in the Last Glacial relative to the Holocene may be related to incongruent effects of firn-based signal smoothing processes. Within interstadial and stadial periods, the peak-to-peak signal amplitudes vary in proportion to the underlying millennial-scale oscillations in CH 4 concentration—the relative amplitude change is constant. We propose that the centennial CH 4 signal is related to tropical climate variability that influences predominantly low-latitude wetland CH 4 emissions. |
author2 |
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 |
Rhodes, Rachael H. Brook, Edward J. Mcconnell, Joseph R. Blunier, Thomas Sime, Louise C. Faïn, Xavier Mulvaney, Robert |
author_facet |
Rhodes, Rachael H. Brook, Edward J. Mcconnell, Joseph R. Blunier, Thomas Sime, Louise C. Faïn, Xavier Mulvaney, Robert |
author_sort |
Rhodes, Rachael H. |
title |
Atmospheric methane variability: Centennial-scale signals in the Last Glacial Period |
title_short |
Atmospheric methane variability: Centennial-scale signals in the Last Glacial Period |
title_full |
Atmospheric methane variability: Centennial-scale signals in the Last Glacial Period |
title_fullStr |
Atmospheric methane variability: Centennial-scale signals in the Last Glacial Period |
title_full_unstemmed |
Atmospheric methane variability: Centennial-scale signals in the Last Glacial Period |
title_sort |
atmospheric methane variability: centennial-scale signals in the last glacial period |
publisher |
HAL CCSD |
publishDate |
2017 |
url |
https://insu.hal.science/insu-03706527 https://insu.hal.science/insu-03706527/document https://insu.hal.science/insu-03706527/file/Global%20Biogeochemical%20Cycles%20-%202017%20-%20Rhodes%20-%20Atmospheric%20methane%20variability%20Centennial%25u2010scale%20signals%20in%20the%20Last.pdf https://doi.org/10.1002/2016GB005570 |
genre |
Antarc* Antarctic ice core Ice Sheet |
genre_facet |
Antarc* Antarctic ice core Ice Sheet |
op_source |
ISSN: 0886-6236 EISSN: 1944-8224 Global Biogeochemical Cycles https://insu.hal.science/insu-03706527 Global Biogeochemical Cycles, 2017, 31, pp.575-590. ⟨10.1002/2016GB005570⟩ |
op_relation |
info:eu-repo/semantics/altIdentifier/doi/10.1002/2016GB005570 insu-03706527 https://insu.hal.science/insu-03706527 https://insu.hal.science/insu-03706527/document https://insu.hal.science/insu-03706527/file/Global%20Biogeochemical%20Cycles%20-%202017%20-%20Rhodes%20-%20Atmospheric%20methane%20variability%20Centennial%25u2010scale%20signals%20in%20the%20Last.pdf BIBCODE: 2017GBioC.31.575R doi:10.1002/2016GB005570 |
op_rights |
http://hal.archives-ouvertes.fr/licences/copyright/ info:eu-repo/semantics/OpenAccess |
op_doi |
https://doi.org/10.1002/2016GB005570 |
container_title |
Global Biogeochemical Cycles |
container_volume |
31 |
container_issue |
3 |
container_start_page |
575 |
op_container_end_page |
590 |
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1797587548811296768 |