CH4 and N2O fluctuations during the penultimate deglaciation
International audience Abstract. Deglaciations are characterized by the largest natural changes in methane (CH4) and nitrous oxide (N2O) concentrations of the past 800 000 years. Reconstructions of millennial- to centennial-scale variability within these periods are mostly restricted to the last deg...
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Online Access: | https://hal.science/hal-03418313 https://hal.science/hal-03418313/document https://hal.science/hal-03418313/file/cp-17-1627-2021.pdf https://doi.org/10.5194/cp-17-1627-2021 |
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ftunigrenoble:oai:HAL:hal-03418313v1 2024-05-12T08:02:50+00:00 CH4 and N2O fluctuations during the penultimate deglaciation Schmidely, Loïc Nehrbass-Ahles, Christoph Schmitt, Jochen Han, Juhyeong Silva, Lucas Shin, Jinwha Joos, Fortunat Chappellaz, Jérôme Fischer, Hubertus Stocker, Thomas Climate and Environmental Physics Bern (CEP) Physikalisches Institut Bern Universität Bern / University of Bern (UNIBE)-Universität Bern / University of Bern (UNIBE) Université Grenoble Alpes (UGA) National Centre of Competence in Research PlanetS (NCCR PlanetS) Universität Bern / University of Bern (UNIBE)-Universität Bern / University of Bern (UNIBE)-Swiss National Science Foundation (SNSF) 2021-08-03 https://hal.science/hal-03418313 https://hal.science/hal-03418313/document https://hal.science/hal-03418313/file/cp-17-1627-2021.pdf https://doi.org/10.5194/cp-17-1627-2021 en eng HAL CCSD European Geosciences Union (EGU) info:eu-repo/semantics/altIdentifier/doi/10.5194/cp-17-1627-2021 hal-03418313 https://hal.science/hal-03418313 https://hal.science/hal-03418313/document https://hal.science/hal-03418313/file/cp-17-1627-2021.pdf doi:10.5194/cp-17-1627-2021 info:eu-repo/semantics/OpenAccess ISSN: 1814-9324 EISSN: 1814-9332 Climate of the Past https://hal.science/hal-03418313 Climate of the Past, 2021, 17 (4), pp.1627-1643. ⟨10.5194/cp-17-1627-2021⟩ [SDE]Environmental Sciences [SDU]Sciences of the Universe [physics] info:eu-repo/semantics/article Journal articles 2021 ftunigrenoble https://doi.org/10.5194/cp-17-1627-2021 2024-04-18T03:12:42Z International audience Abstract. Deglaciations are characterized by the largest natural changes in methane (CH4) and nitrous oxide (N2O) concentrations of the past 800 000 years. Reconstructions of millennial- to centennial-scale variability within these periods are mostly restricted to the last deglaciation. In this study, we present composite records of CH4 and N2O concentrations from the EPICA Dome C ice core covering the penultimate deglaciation at temporal resolutions of ∼100 years. Our data permit the identification of centennial-scale fluctuations during the transition from glacial to interglacial levels. At ∼134 000 and ∼129 000 years before present (hereafter ka), both CH4 and N2O increased on centennial timescales. These abrupt rises are similar to the fluctuations associated with the Dansgaard–Oeschger events identified in the last glacial period. In addition, gradually rising N2O levels at ∼130 ka resemble a pattern of increasing N2O concentrations on millennial timescales characterizing the later part of Heinrich stadials. Overall, the events in CH4 and N2O during the penultimate deglaciation exhibit modes of variability that are also found during the last deglaciation and glacial cycle, suggesting that the processes leading to changes in emission during the transitions were similar but their timing differed. Article in Journal/Newspaper Dansgaard-Oeschger events EPICA ice core Université Grenoble Alpes: HAL Climate of the Past 17 4 1627 1643 |
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Open Polar |
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Université Grenoble Alpes: HAL |
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ftunigrenoble |
language |
English |
topic |
[SDE]Environmental Sciences [SDU]Sciences of the Universe [physics] |
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[SDE]Environmental Sciences [SDU]Sciences of the Universe [physics] Schmidely, Loïc Nehrbass-Ahles, Christoph Schmitt, Jochen Han, Juhyeong Silva, Lucas Shin, Jinwha Joos, Fortunat Chappellaz, Jérôme Fischer, Hubertus Stocker, Thomas CH4 and N2O fluctuations during the penultimate deglaciation |
topic_facet |
[SDE]Environmental Sciences [SDU]Sciences of the Universe [physics] |
description |
International audience Abstract. Deglaciations are characterized by the largest natural changes in methane (CH4) and nitrous oxide (N2O) concentrations of the past 800 000 years. Reconstructions of millennial- to centennial-scale variability within these periods are mostly restricted to the last deglaciation. In this study, we present composite records of CH4 and N2O concentrations from the EPICA Dome C ice core covering the penultimate deglaciation at temporal resolutions of ∼100 years. Our data permit the identification of centennial-scale fluctuations during the transition from glacial to interglacial levels. At ∼134 000 and ∼129 000 years before present (hereafter ka), both CH4 and N2O increased on centennial timescales. These abrupt rises are similar to the fluctuations associated with the Dansgaard–Oeschger events identified in the last glacial period. In addition, gradually rising N2O levels at ∼130 ka resemble a pattern of increasing N2O concentrations on millennial timescales characterizing the later part of Heinrich stadials. Overall, the events in CH4 and N2O during the penultimate deglaciation exhibit modes of variability that are also found during the last deglaciation and glacial cycle, suggesting that the processes leading to changes in emission during the transitions were similar but their timing differed. |
author2 |
Climate and Environmental Physics Bern (CEP) Physikalisches Institut Bern Universität Bern / University of Bern (UNIBE)-Universität Bern / University of Bern (UNIBE) Université Grenoble Alpes (UGA) National Centre of Competence in Research PlanetS (NCCR PlanetS) Universität Bern / University of Bern (UNIBE)-Universität Bern / University of Bern (UNIBE)-Swiss National Science Foundation (SNSF) |
format |
Article in Journal/Newspaper |
author |
Schmidely, Loïc Nehrbass-Ahles, Christoph Schmitt, Jochen Han, Juhyeong Silva, Lucas Shin, Jinwha Joos, Fortunat Chappellaz, Jérôme Fischer, Hubertus Stocker, Thomas |
author_facet |
Schmidely, Loïc Nehrbass-Ahles, Christoph Schmitt, Jochen Han, Juhyeong Silva, Lucas Shin, Jinwha Joos, Fortunat Chappellaz, Jérôme Fischer, Hubertus Stocker, Thomas |
author_sort |
Schmidely, Loïc |
title |
CH4 and N2O fluctuations during the penultimate deglaciation |
title_short |
CH4 and N2O fluctuations during the penultimate deglaciation |
title_full |
CH4 and N2O fluctuations during the penultimate deglaciation |
title_fullStr |
CH4 and N2O fluctuations during the penultimate deglaciation |
title_full_unstemmed |
CH4 and N2O fluctuations during the penultimate deglaciation |
title_sort |
ch4 and n2o fluctuations during the penultimate deglaciation |
publisher |
HAL CCSD |
publishDate |
2021 |
url |
https://hal.science/hal-03418313 https://hal.science/hal-03418313/document https://hal.science/hal-03418313/file/cp-17-1627-2021.pdf https://doi.org/10.5194/cp-17-1627-2021 |
genre |
Dansgaard-Oeschger events EPICA ice core |
genre_facet |
Dansgaard-Oeschger events EPICA ice core |
op_source |
ISSN: 1814-9324 EISSN: 1814-9332 Climate of the Past https://hal.science/hal-03418313 Climate of the Past, 2021, 17 (4), pp.1627-1643. ⟨10.5194/cp-17-1627-2021⟩ |
op_relation |
info:eu-repo/semantics/altIdentifier/doi/10.5194/cp-17-1627-2021 hal-03418313 https://hal.science/hal-03418313 https://hal.science/hal-03418313/document https://hal.science/hal-03418313/file/cp-17-1627-2021.pdf doi:10.5194/cp-17-1627-2021 |
op_rights |
info:eu-repo/semantics/OpenAccess |
op_doi |
https://doi.org/10.5194/cp-17-1627-2021 |
container_title |
Climate of the Past |
container_volume |
17 |
container_issue |
4 |
container_start_page |
1627 |
op_container_end_page |
1643 |
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1798844984464506880 |