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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ftdatacite:10.7892/boris.47732 2024-09-30T14:26:52+00:00 Independent variations of CH₄ emissions and isotopic composition over the past 160,000 years ... Möller, Lars Schmitt, Jochen Fischer, Hubertus Miller, Heinrich Behrens, Melanie Spahni, Renato Bock, Michael Sowers, Todd 2013 application/pdf https://dx.doi.org/10.7892/boris.47732 http://boris.unibe.ch/47732/ en eng Nature Publishing Group info:eu-repo/semantics/restrictedAccess 530 Physics CreativeWork article 2013 ftdatacite https://doi.org/10.7892/boris.47732 2024-09-02T10:00:02Z 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 delta C-13 of methane in Antarctic ice cores from Dronning Maud Land and Vostok. We find that variations in the delta C-13 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 delta C-13 values ... Article in Journal/Newspaper Antarc* Antarctic Dronning Maud Land DataCite Antarctic Dronning Maud Land |
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English |
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530 Physics |
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530 Physics Möller, Lars Schmitt, Jochen Fischer, Hubertus Miller, Heinrich Behrens, Melanie Spahni, Renato Bock, Michael Sowers, Todd Independent variations of CH₄ emissions and isotopic composition over the past 160,000 years ... |
topic_facet |
530 Physics |
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 delta C-13 of methane in Antarctic ice cores from Dronning Maud Land and Vostok. We find that variations in the delta C-13 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 delta C-13 values ... |
format |
Article in Journal/Newspaper |
author |
Möller, Lars Schmitt, Jochen Fischer, Hubertus Miller, Heinrich Behrens, Melanie Spahni, Renato Bock, Michael Sowers, Todd |
author_facet |
Möller, Lars Schmitt, Jochen Fischer, Hubertus Miller, Heinrich Behrens, Melanie Spahni, Renato Bock, Michael Sowers, Todd |
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://dx.doi.org/10.7892/boris.47732 http://boris.unibe.ch/47732/ |
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_rights |
info:eu-repo/semantics/restrictedAccess |
op_doi |
https://doi.org/10.7892/boris.47732 |
_version_ |
1811632987184300032 |