Independent variations of CH4 emissions and isotopic composition over the past 160,000 years
During the last glacial cycle, greenhouse gas concentrations fluctuated on decadal and longer timescales. Concentrations of methane, as measured in polar ice cores, show a close connection with Northern Hemisphere temperature variability, but the contribution of the various methane sources and sinks...
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NATURE PUBLISHING GROUP
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Online Access: | https://epic.awi.de/id/eprint/33679/ https://epic.awi.de/id/eprint/33679/1/Moeller2013_d13CH4NatGeo.pdf https://epic.awi.de/id/eprint/33679/2/Moeller2013_d13CH4NatGeo_Supplements.pdf https://epic.awi.de/id/eprint/33679/3/Suppl_Figures1-4_ngeo1922.zip https://doi.org/10.1038/ngeo1922 https://hdl.handle.net/10013/epic.42368 https://hdl.handle.net/10013/epic.42368.d001 https://hdl.handle.net/10013/epic.42368.d002 https://hdl.handle.net/10013/epic.42368.d003 |
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ftawi:oai:epic.awi.de:33679 2023-05-15T13:40:26+02:00 Independent variations of CH4 emissions and isotopic composition over the past 160,000 years Möller, Lars Sowers, Todd Bock, Michael Spahni, Renato Behrens, Melanie Schmitt, Jochen Miller, Heinrich Fischer, Hubertus 2013-09-27 application/pdf application/zip https://epic.awi.de/id/eprint/33679/ https://epic.awi.de/id/eprint/33679/1/Moeller2013_d13CH4NatGeo.pdf https://epic.awi.de/id/eprint/33679/2/Moeller2013_d13CH4NatGeo_Supplements.pdf https://epic.awi.de/id/eprint/33679/3/Suppl_Figures1-4_ngeo1922.zip https://doi.org/10.1038/ngeo1922 https://hdl.handle.net/10013/epic.42368 https://hdl.handle.net/10013/epic.42368.d001 https://hdl.handle.net/10013/epic.42368.d002 https://hdl.handle.net/10013/epic.42368.d003 unknown NATURE PUBLISHING GROUP https://epic.awi.de/id/eprint/33679/1/Moeller2013_d13CH4NatGeo.pdf https://hdl.handle.net/10013/epic.42368.d001 https://epic.awi.de/id/eprint/33679/2/Moeller2013_d13CH4NatGeo_Supplements.pdf https://hdl.handle.net/10013/epic.42368.d002 https://epic.awi.de/id/eprint/33679/3/Suppl_Figures1-4_ngeo1922.zip https://hdl.handle.net/10013/epic.42368.d003 Möller, L. , Sowers, T. , Bock, M. , Spahni, R. , Behrens, M. orcid:0000-0001-9275-4333 , Schmitt, J. , Miller, H. and Fischer, H. (2013) Independent variations of CH4 emissions and isotopic composition over the past 160,000 years , Nature Geoscience, 6 (10), pp. 885-890 . doi:10.1038/ngeo1922 <https://doi.org/10.1038/ngeo1922> , hdl:10013/epic.42368 EPIC3Nature Geoscience, NATURE PUBLISHING GROUP, 6(10), pp. 885-890, ISSN: 1752-0894 Article isiRev 2013 ftawi https://doi.org/10.1038/ngeo1922 2021-12-24T15:38:53Z During the last glacial cycle, greenhouse gas concentrations fluctuated on decadal and longer timescales. Concentrations of methane, as measured in polar ice cores, show a close connection with Northern Hemisphere temperature variability, but the contribution of the various methane sources and sinks to changes in concentration is still a matter of debate. Here we assess changes in methane cycling over the past 160,000 years by measurements of the carbon isotopic composition δ13C of methane in Antarctic ice cores from Dronning Maud Land and Vostok. We find that variations in the δ13C of methane are not generally correlated with changes in atmospheric methane concentration, but instead more closely correlated to atmospheric CO2 concentrations. We interpret this to reflect a climatic and CO2-related control on the isotopic signature of methane source material, such as ecosystem shifts in the seasonally inundated tropical wetlands that produce methane. In contrast, relatively stable δ13C values occurred during intervals of large changes in the atmospheric loading of methane. We suggest that most methane sources—most notably tropical wetlands—must have responded simultaneously to climate changes across these periods. Article in Journal/Newspaper Antarc* Antarctic Dronning Maud Land Alfred Wegener Institute for Polar- and Marine Research (AWI): ePIC (electronic Publication Information Center) Antarctic Dronning Maud Land Nature Geoscience 6 10 885 890 |
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Open Polar |
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Alfred Wegener Institute for Polar- and Marine Research (AWI): ePIC (electronic Publication Information Center) |
op_collection_id |
ftawi |
language |
unknown |
description |
During the last glacial cycle, greenhouse gas concentrations fluctuated on decadal and longer timescales. Concentrations of methane, as measured in polar ice cores, show a close connection with Northern Hemisphere temperature variability, but the contribution of the various methane sources and sinks to changes in concentration is still a matter of debate. Here we assess changes in methane cycling over the past 160,000 years by measurements of the carbon isotopic composition δ13C of methane in Antarctic ice cores from Dronning Maud Land and Vostok. We find that variations in the δ13C of methane are not generally correlated with changes in atmospheric methane concentration, but instead more closely correlated to atmospheric CO2 concentrations. We interpret this to reflect a climatic and CO2-related control on the isotopic signature of methane source material, such as ecosystem shifts in the seasonally inundated tropical wetlands that produce methane. In contrast, relatively stable δ13C values occurred during intervals of large changes in the atmospheric loading of methane. We suggest that most methane sources—most notably tropical wetlands—must have responded simultaneously to climate changes across these periods. |
format |
Article in Journal/Newspaper |
author |
Möller, Lars Sowers, Todd Bock, Michael Spahni, Renato Behrens, Melanie Schmitt, Jochen Miller, Heinrich Fischer, Hubertus |
spellingShingle |
Möller, Lars Sowers, Todd Bock, Michael Spahni, Renato Behrens, Melanie Schmitt, Jochen Miller, Heinrich Fischer, Hubertus Independent variations of CH4 emissions and isotopic composition over the past 160,000 years |
author_facet |
Möller, Lars Sowers, Todd Bock, Michael Spahni, Renato Behrens, Melanie Schmitt, Jochen Miller, Heinrich Fischer, Hubertus |
author_sort |
Möller, Lars |
title |
Independent variations of CH4 emissions and isotopic composition over the past 160,000 years |
title_short |
Independent variations of CH4 emissions and isotopic composition over the past 160,000 years |
title_full |
Independent variations of CH4 emissions and isotopic composition over the past 160,000 years |
title_fullStr |
Independent variations of CH4 emissions and isotopic composition over the past 160,000 years |
title_full_unstemmed |
Independent variations of CH4 emissions and isotopic composition over the past 160,000 years |
title_sort |
independent variations of ch4 emissions and isotopic composition over the past 160,000 years |
publisher |
NATURE PUBLISHING GROUP |
publishDate |
2013 |
url |
https://epic.awi.de/id/eprint/33679/ https://epic.awi.de/id/eprint/33679/1/Moeller2013_d13CH4NatGeo.pdf https://epic.awi.de/id/eprint/33679/2/Moeller2013_d13CH4NatGeo_Supplements.pdf https://epic.awi.de/id/eprint/33679/3/Suppl_Figures1-4_ngeo1922.zip https://doi.org/10.1038/ngeo1922 https://hdl.handle.net/10013/epic.42368 https://hdl.handle.net/10013/epic.42368.d001 https://hdl.handle.net/10013/epic.42368.d002 https://hdl.handle.net/10013/epic.42368.d003 |
geographic |
Antarctic Dronning Maud Land |
geographic_facet |
Antarctic Dronning Maud Land |
genre |
Antarc* Antarctic Dronning Maud Land |
genre_facet |
Antarc* Antarctic Dronning Maud Land |
op_source |
EPIC3Nature Geoscience, NATURE PUBLISHING GROUP, 6(10), pp. 885-890, ISSN: 1752-0894 |
op_relation |
https://epic.awi.de/id/eprint/33679/1/Moeller2013_d13CH4NatGeo.pdf https://hdl.handle.net/10013/epic.42368.d001 https://epic.awi.de/id/eprint/33679/2/Moeller2013_d13CH4NatGeo_Supplements.pdf https://hdl.handle.net/10013/epic.42368.d002 https://epic.awi.de/id/eprint/33679/3/Suppl_Figures1-4_ngeo1922.zip https://hdl.handle.net/10013/epic.42368.d003 Möller, L. , Sowers, T. , Bock, M. , Spahni, R. , Behrens, M. orcid:0000-0001-9275-4333 , Schmitt, J. , Miller, H. and Fischer, H. (2013) Independent variations of CH4 emissions and isotopic composition over the past 160,000 years , Nature Geoscience, 6 (10), pp. 885-890 . doi:10.1038/ngeo1922 <https://doi.org/10.1038/ngeo1922> , hdl:10013/epic.42368 |
op_doi |
https://doi.org/10.1038/ngeo1922 |
container_title |
Nature Geoscience |
container_volume |
6 |
container_issue |
10 |
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885 |
op_container_end_page |
890 |
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1766133614219624448 |