CH4 and N2O fluctuations during the penultimate deglaciation
Deglaciations are characterized by the largest natural changes in methane (CH 4 ) and nitrous oxide (N 2 O) 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...
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ftcopernicus:oai:publications.copernicus.org:cp90028 2023-05-15T16:00:03+02:00 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 F. 2021-08-03 application/pdf https://doi.org/10.5194/cp-17-1627-2021 https://cp.copernicus.org/articles/17/1627/2021/ eng eng doi:10.5194/cp-17-1627-2021 https://cp.copernicus.org/articles/17/1627/2021/ eISSN: 1814-9332 Text 2021 ftcopernicus https://doi.org/10.5194/cp-17-1627-2021 2021-08-09T16:22:28Z Deglaciations are characterized by the largest natural changes in methane (CH 4 ) and nitrous oxide (N 2 O) 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 CH 4 and N 2 O 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 CH 4 and N 2 O 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 N 2 O levels at ∼130 ka resemble a pattern of increasing N 2 O concentrations on millennial timescales characterizing the later part of Heinrich stadials. Overall, the events in CH 4 and N 2 O 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. Text Dansgaard-Oeschger events EPICA ice core Copernicus Publications: E-Journals Climate of the Past 17 4 1627 1643 |
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English |
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Deglaciations are characterized by the largest natural changes in methane (CH 4 ) and nitrous oxide (N 2 O) 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 CH 4 and N 2 O 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 CH 4 and N 2 O 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 N 2 O levels at ∼130 ka resemble a pattern of increasing N 2 O concentrations on millennial timescales characterizing the later part of Heinrich stadials. Overall, the events in CH 4 and N 2 O 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. |
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Text |
author |
Schmidely, Loïc Nehrbass-Ahles, Christoph Schmitt, Jochen Han, Juhyeong Silva, Lucas Shin, Jinwha Joos, Fortunat Chappellaz, Jérôme Fischer, Hubertus Stocker, Thomas F. |
spellingShingle |
Schmidely, Loïc Nehrbass-Ahles, Christoph Schmitt, Jochen Han, Juhyeong Silva, Lucas Shin, Jinwha Joos, Fortunat Chappellaz, Jérôme Fischer, Hubertus Stocker, Thomas F. CH4 and N2O fluctuations during the penultimate deglaciation |
author_facet |
Schmidely, Loïc Nehrbass-Ahles, Christoph Schmitt, Jochen Han, Juhyeong Silva, Lucas Shin, Jinwha Joos, Fortunat Chappellaz, Jérôme Fischer, Hubertus Stocker, Thomas F. |
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 |
publishDate |
2021 |
url |
https://doi.org/10.5194/cp-17-1627-2021 https://cp.copernicus.org/articles/17/1627/2021/ |
genre |
Dansgaard-Oeschger events EPICA ice core |
genre_facet |
Dansgaard-Oeschger events EPICA ice core |
op_source |
eISSN: 1814-9332 |
op_relation |
doi:10.5194/cp-17-1627-2021 https://cp.copernicus.org/articles/17/1627/2021/ |
op_doi |
https://doi.org/10.5194/cp-17-1627-2021 |
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Climate of the Past |
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17 |
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4 |
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1627 |
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1643 |
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1766395923573768192 |