Records of the δ13C of atmospheric CH4 over the last 2 centuries as recorded in Antarctic snow and ice
Methane is one of the important greenhouse gases accumulating in the atmosphere today. The increased loading over the past 2 centuries is thought to be the result of increased anthropogenic emissions. Here we present records of the δ13C of CH4 in firn air from the South Pole and in trapped bubbles i...
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Washington, American Geophysical Union (AGU)
2022
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Online Access: | https://doi.org/10.1029/2004GB002408 http://infoscience.epfl.ch/record/298371 |
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ftinfoscience:oai:infoscience.epfl.ch:298371 2023-05-15T13:43:17+02:00 Records of the δ13C of atmospheric CH4 over the last 2 centuries as recorded in Antarctic snow and ice Sowers, T. Bernard, S. Aballain, O. Chappellaz, J. Barnola, J. M. Marik, T. 2022-11-23T16:11:53Z https://doi.org/10.1029/2004GB002408 http://infoscience.epfl.ch/record/298371 unknown Washington, American Geophysical Union (AGU) doi:10.1029/2004GB002408 isi:000228365700002 http://infoscience.epfl.ch/record/298371 http://infoscience.epfl.ch/record/298371 Text 2022 ftinfoscience https://doi.org/10.1029/2004GB002408 2023-02-13T23:12:34Z Methane is one of the important greenhouse gases accumulating in the atmosphere today. The increased loading over the past 2 centuries is thought to be the result of increased anthropogenic emissions. Here we present records of the δ13C of CH4 in firn air from the South Pole and in trapped bubbles in a short ice core from Siple Dome, Antarctica, that help constrain historical emissions of various sources throughout the last 2 centuries. Using two firn air samplings in 1995 and 2001 we calculate that δ 13CH4 has increased by an average of 0.06 ± 0.02‰/yr over the 6 years between samplings. Our ice core results suggest the δ13C of atmospheric CH4 has increased by 1.8 ± 0.2‰ between 1820 A.D. and 2001 A.D. The δ13CH4 changes in both data sets are the result of an increase in the relative proportion of CH4 sources with elevated 13C/12C isotope ratios. One explanation for observed trends involves a 16 Tg/yr increase in CH4 emissions associated with biomass burning over the past 2 centuries. Copyright 2005 by the American Geophysical Union. Text Antarc* Antarctic Antarctica ice core South pole South pole EPFL Infoscience (Ecole Polytechnique Fédérale Lausanne) Antarctic Siple ENVELOPE(-83.917,-83.917,-75.917,-75.917) Siple Dome ENVELOPE(-148.833,-148.833,-81.667,-81.667) South Pole Global Biogeochemical Cycles 19 2 n/a n/a |
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EPFL Infoscience (Ecole Polytechnique Fédérale Lausanne) |
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ftinfoscience |
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description |
Methane is one of the important greenhouse gases accumulating in the atmosphere today. The increased loading over the past 2 centuries is thought to be the result of increased anthropogenic emissions. Here we present records of the δ13C of CH4 in firn air from the South Pole and in trapped bubbles in a short ice core from Siple Dome, Antarctica, that help constrain historical emissions of various sources throughout the last 2 centuries. Using two firn air samplings in 1995 and 2001 we calculate that δ 13CH4 has increased by an average of 0.06 ± 0.02‰/yr over the 6 years between samplings. Our ice core results suggest the δ13C of atmospheric CH4 has increased by 1.8 ± 0.2‰ between 1820 A.D. and 2001 A.D. The δ13CH4 changes in both data sets are the result of an increase in the relative proportion of CH4 sources with elevated 13C/12C isotope ratios. One explanation for observed trends involves a 16 Tg/yr increase in CH4 emissions associated with biomass burning over the past 2 centuries. Copyright 2005 by the American Geophysical Union. |
format |
Text |
author |
Sowers, T. Bernard, S. Aballain, O. Chappellaz, J. Barnola, J. M. Marik, T. |
spellingShingle |
Sowers, T. Bernard, S. Aballain, O. Chappellaz, J. Barnola, J. M. Marik, T. Records of the δ13C of atmospheric CH4 over the last 2 centuries as recorded in Antarctic snow and ice |
author_facet |
Sowers, T. Bernard, S. Aballain, O. Chappellaz, J. Barnola, J. M. Marik, T. |
author_sort |
Sowers, T. |
title |
Records of the δ13C of atmospheric CH4 over the last 2 centuries as recorded in Antarctic snow and ice |
title_short |
Records of the δ13C of atmospheric CH4 over the last 2 centuries as recorded in Antarctic snow and ice |
title_full |
Records of the δ13C of atmospheric CH4 over the last 2 centuries as recorded in Antarctic snow and ice |
title_fullStr |
Records of the δ13C of atmospheric CH4 over the last 2 centuries as recorded in Antarctic snow and ice |
title_full_unstemmed |
Records of the δ13C of atmospheric CH4 over the last 2 centuries as recorded in Antarctic snow and ice |
title_sort |
records of the δ13c of atmospheric ch4 over the last 2 centuries as recorded in antarctic snow and ice |
publisher |
Washington, American Geophysical Union (AGU) |
publishDate |
2022 |
url |
https://doi.org/10.1029/2004GB002408 http://infoscience.epfl.ch/record/298371 |
long_lat |
ENVELOPE(-83.917,-83.917,-75.917,-75.917) ENVELOPE(-148.833,-148.833,-81.667,-81.667) |
geographic |
Antarctic Siple Siple Dome South Pole |
geographic_facet |
Antarctic Siple Siple Dome South Pole |
genre |
Antarc* Antarctic Antarctica ice core South pole South pole |
genre_facet |
Antarc* Antarctic Antarctica ice core South pole South pole |
op_source |
http://infoscience.epfl.ch/record/298371 |
op_relation |
doi:10.1029/2004GB002408 isi:000228365700002 http://infoscience.epfl.ch/record/298371 |
op_doi |
https://doi.org/10.1029/2004GB002408 |
container_title |
Global Biogeochemical Cycles |
container_volume |
19 |
container_issue |
2 |
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1766186873226526720 |