Atmospheric methane since the last glacial maximum was driven by wetland sources
Atmospheric methane (CH4) has changed considerably in the time between the last glacial maximum (LGM) and the preindustrial (PI) periods. We investigate these changes in transient experiments with an Earth system model capable of simulating the global methane cycle interactively, focusing on the rap...
Published in: | Climate of the Past |
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Copernicus Publications (EGU)
2023
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Online Access: | https://oceanrep.geomar.de/id/eprint/59764/ https://oceanrep.geomar.de/id/eprint/59764/1/cp-19-1081-2023.pdf https://doi.org/10.5194/cp-19-1081-2023 |
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ftoceanrep:oai:oceanrep.geomar.de:59764 2024-02-11T10:04:52+01:00 Atmospheric methane since the last glacial maximum was driven by wetland sources Kleinen, Thomas Gromov, Sergey Steil, Benedikt Brovkin, Victor 2023-06-01 text https://oceanrep.geomar.de/id/eprint/59764/ https://oceanrep.geomar.de/id/eprint/59764/1/cp-19-1081-2023.pdf https://doi.org/10.5194/cp-19-1081-2023 en eng Copernicus Publications (EGU) https://oceanrep.geomar.de/id/eprint/59764/1/cp-19-1081-2023.pdf Kleinen, T., Gromov, S., Steil, B. and Brovkin, V. (2023) Atmospheric methane since the last glacial maximum was driven by wetland sources. Open Access Climate of the Past, 19 (5). pp. 1081-1099. DOI 10.5194/cp-19-1081-2023 <https://doi.org/10.5194/cp-19-1081-2023>. doi:10.5194/cp-19-1081-2023 cc_by_4.0 info:eu-repo/semantics/openAccess Article PeerReviewed 2023 ftoceanrep https://doi.org/10.5194/cp-19-1081-2023 2024-01-22T00:22:40Z Atmospheric methane (CH4) has changed considerably in the time between the last glacial maximum (LGM) and the preindustrial (PI) periods. We investigate these changes in transient experiments with an Earth system model capable of simulating the global methane cycle interactively, focusing on the rapid changes during the deglaciation, especially pronounced in the Bølling–Allerød (BA) and Younger Dryas (YD) periods. We consider all relevant natural sources and sinks of methane and examine the drivers of changes in methane emissions as well as in the atmospheric lifetime of methane. We find that the evolution of atmospheric methane is largely driven by emissions from tropical wetlands, while variations in the methane atmospheric lifetime are small but not negligible. Our model reproduces most changes in atmospheric methane very well, with the exception of the mid-Holocene decrease in methane, although the timing of ice-sheet meltwater fluxes needs to be adjusted slightly in order to exactly reproduce the variations in the BA and YD. Article in Journal/Newspaper Ice Sheet OceanRep (GEOMAR Helmholtz Centre für Ocean Research Kiel) Climate of the Past 19 5 1081 1099 |
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OceanRep (GEOMAR Helmholtz Centre für Ocean Research Kiel) |
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ftoceanrep |
language |
English |
description |
Atmospheric methane (CH4) has changed considerably in the time between the last glacial maximum (LGM) and the preindustrial (PI) periods. We investigate these changes in transient experiments with an Earth system model capable of simulating the global methane cycle interactively, focusing on the rapid changes during the deglaciation, especially pronounced in the Bølling–Allerød (BA) and Younger Dryas (YD) periods. We consider all relevant natural sources and sinks of methane and examine the drivers of changes in methane emissions as well as in the atmospheric lifetime of methane. We find that the evolution of atmospheric methane is largely driven by emissions from tropical wetlands, while variations in the methane atmospheric lifetime are small but not negligible. Our model reproduces most changes in atmospheric methane very well, with the exception of the mid-Holocene decrease in methane, although the timing of ice-sheet meltwater fluxes needs to be adjusted slightly in order to exactly reproduce the variations in the BA and YD. |
format |
Article in Journal/Newspaper |
author |
Kleinen, Thomas Gromov, Sergey Steil, Benedikt Brovkin, Victor |
spellingShingle |
Kleinen, Thomas Gromov, Sergey Steil, Benedikt Brovkin, Victor Atmospheric methane since the last glacial maximum was driven by wetland sources |
author_facet |
Kleinen, Thomas Gromov, Sergey Steil, Benedikt Brovkin, Victor |
author_sort |
Kleinen, Thomas |
title |
Atmospheric methane since the last glacial maximum was driven by wetland sources |
title_short |
Atmospheric methane since the last glacial maximum was driven by wetland sources |
title_full |
Atmospheric methane since the last glacial maximum was driven by wetland sources |
title_fullStr |
Atmospheric methane since the last glacial maximum was driven by wetland sources |
title_full_unstemmed |
Atmospheric methane since the last glacial maximum was driven by wetland sources |
title_sort |
atmospheric methane since the last glacial maximum was driven by wetland sources |
publisher |
Copernicus Publications (EGU) |
publishDate |
2023 |
url |
https://oceanrep.geomar.de/id/eprint/59764/ https://oceanrep.geomar.de/id/eprint/59764/1/cp-19-1081-2023.pdf https://doi.org/10.5194/cp-19-1081-2023 |
genre |
Ice Sheet |
genre_facet |
Ice Sheet |
op_relation |
https://oceanrep.geomar.de/id/eprint/59764/1/cp-19-1081-2023.pdf Kleinen, T., Gromov, S., Steil, B. and Brovkin, V. (2023) Atmospheric methane since the last glacial maximum was driven by wetland sources. Open Access Climate of the Past, 19 (5). pp. 1081-1099. DOI 10.5194/cp-19-1081-2023 <https://doi.org/10.5194/cp-19-1081-2023>. doi:10.5194/cp-19-1081-2023 |
op_rights |
cc_by_4.0 info:eu-repo/semantics/openAccess |
op_doi |
https://doi.org/10.5194/cp-19-1081-2023 |
container_title |
Climate of the Past |
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19 |
container_issue |
5 |
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1081 |
op_container_end_page |
1099 |
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1790601625548619776 |