Constraining the sources of the CH4 increase during the Oldest Dryas-Bølling abrupt warming event using 14CH4 measurements from Taylor Glacier, Antarctica
Methane (CH4) is an important greenhouse gas with both natural and anthropogenic sources. Understanding how the natural CH4 budget has changed in response to changing climate in the past can provide insights on the sensitivity of the natural CH4 emissions to the current anthropogenic warming. Low la...
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Antarctic Climate and Ecosystems Cooperative Research Centre
2020
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ftansto:oai:apo-prod.ansto.gov.au:10238/9542 2023-05-15T13:36:16+02:00 Constraining the sources of the CH4 increase during the Oldest Dryas-Bølling abrupt warming event using 14CH4 measurements from Taylor Glacier, Antarctica Doyonisius, M Petrenko, VV Smith, AM Hmiel, B Hua, Q Harth, C Baggenstos, D Bauska, TK Bock, M Beck, J Seth, B Beaudette, R Schmitt, J Palardy, A Brooks, E Weiss, R Fischer, H Severinghaus, J 2020-05-28 http://apo.ansto.gov.au/dspace/handle/10238/9542 https://static1.squarespace.com/static/5459b25de4b00ee921cd006d/t/56dce081c2ea51eadac2f4e1/1457315995517/IPICS+2016+-+Abstracts.pdf en eng Antarctic Climate and Ecosystems Cooperative Research Centre Doyonisius, M., Petrenko, V. V., Smith, A., Hmiel, B., Hua, Q., Harth, C., Baggenstos, D., Bauska, T., Bauska, T., Bock, M., Beck, J., Seth, B., Baudette, R., Schmitt, J., Palardy, A., Brooks, E., Weiss, R., Fischer, H., Severinghaus, J. (2016). Constraining the sources of the CH4 increase during the Oldest Dryas-Bølling abrupt warming event using 14CH4 measurements from Taylor Glacier, Antarctica. Paper presented at the IPICS 2016, International Partnerships in Ice Core Sciences, Secon Open Science Conference, 7-11 March 2016, Hobart, Tasmania. https://static1.squarespace.com/static/5459b25de4b00ee921cd006d/t/56dce081c2ea51eadac2f4e1/1457315995517/IPICS+2016+-+Abstracts.pdf http://apo.ansto.gov.au/dspace/handle/10238/9542 Methane Glaciers Antarctic regions Climates Paleoclimatology Climatic change Greenhouse effect Drill cores Greenland Permafrost Conference Abstract 2020 ftansto 2020-09-07T22:28:47Z Methane (CH4) is an important greenhouse gas with both natural and anthropogenic sources. Understanding how the natural CH4 budget has changed in response to changing climate in the past can provide insights on the sensitivity of the natural CH4 emissions to the current anthropogenic warming. Low latitude wetlands are the largest natural source of CH¬4 to the atmosphere. It has been proposed, however, that in the future warming world emissions from marine CH4 clathrates and Arctic permafrost might increase significantly. CH4 isotopes from ice cores in Greenland and Antarctica have been used to constrain the past CH¬4 budget. 14CH4 is unique in its ability to unambiguously distinguish between “old” CH4 sources (e.g. marine clathrate, geologic sources, old permafrost) and “modern” CH4 sources (e.g. tropical and boreal wetlands). We have successfully collected six large volume (~1000 kg) samples of ancient ice from Taylor Glacier, Antarctica that span the Oldest Dryas – Bølling (OD-BO) CH4 transition (~14.5ka). The OD-BO is the first large abrupt CH4 increase following the Last Glacial Maximum, with atmospheric CH4 increasing by ≈30% in the span of ≈ 200 years. All samples have recently been successfully measured for 14CH4, δ13C-CH4, and δD-CH4. 14CH4 measurements of accompanying procedural blanks show that effects from extraneous carbon addition during processing are small. Results are currently undergoing corrections for in-situ cosmogenic 14C based on 14CO measurements in the same samples. We will present the corrected 14CH4 results and preliminary interpretation with regard to causes of the OD-BO CH4 increase. Conference Object Antarc* Antarctic Antarctica Arctic glacier Greenland Ice permafrost Taylor Glacier Australian Nuclear Science and Technology Organisation: ANSTO Publications Online Antarctic Arctic Greenland Taylor Glacier ENVELOPE(162.167,162.167,-77.733,-77.733) |
institution |
Open Polar |
collection |
Australian Nuclear Science and Technology Organisation: ANSTO Publications Online |
op_collection_id |
ftansto |
language |
English |
topic |
Methane Glaciers Antarctic regions Climates Paleoclimatology Climatic change Greenhouse effect Drill cores Greenland Permafrost |
spellingShingle |
Methane Glaciers Antarctic regions Climates Paleoclimatology Climatic change Greenhouse effect Drill cores Greenland Permafrost Doyonisius, M Petrenko, VV Smith, AM Hmiel, B Hua, Q Harth, C Baggenstos, D Bauska, TK Bock, M Beck, J Seth, B Beaudette, R Schmitt, J Palardy, A Brooks, E Weiss, R Fischer, H Severinghaus, J Constraining the sources of the CH4 increase during the Oldest Dryas-Bølling abrupt warming event using 14CH4 measurements from Taylor Glacier, Antarctica |
topic_facet |
Methane Glaciers Antarctic regions Climates Paleoclimatology Climatic change Greenhouse effect Drill cores Greenland Permafrost |
description |
Methane (CH4) is an important greenhouse gas with both natural and anthropogenic sources. Understanding how the natural CH4 budget has changed in response to changing climate in the past can provide insights on the sensitivity of the natural CH4 emissions to the current anthropogenic warming. Low latitude wetlands are the largest natural source of CH¬4 to the atmosphere. It has been proposed, however, that in the future warming world emissions from marine CH4 clathrates and Arctic permafrost might increase significantly. CH4 isotopes from ice cores in Greenland and Antarctica have been used to constrain the past CH¬4 budget. 14CH4 is unique in its ability to unambiguously distinguish between “old” CH4 sources (e.g. marine clathrate, geologic sources, old permafrost) and “modern” CH4 sources (e.g. tropical and boreal wetlands). We have successfully collected six large volume (~1000 kg) samples of ancient ice from Taylor Glacier, Antarctica that span the Oldest Dryas – Bølling (OD-BO) CH4 transition (~14.5ka). The OD-BO is the first large abrupt CH4 increase following the Last Glacial Maximum, with atmospheric CH4 increasing by ≈30% in the span of ≈ 200 years. All samples have recently been successfully measured for 14CH4, δ13C-CH4, and δD-CH4. 14CH4 measurements of accompanying procedural blanks show that effects from extraneous carbon addition during processing are small. Results are currently undergoing corrections for in-situ cosmogenic 14C based on 14CO measurements in the same samples. We will present the corrected 14CH4 results and preliminary interpretation with regard to causes of the OD-BO CH4 increase. |
format |
Conference Object |
author |
Doyonisius, M Petrenko, VV Smith, AM Hmiel, B Hua, Q Harth, C Baggenstos, D Bauska, TK Bock, M Beck, J Seth, B Beaudette, R Schmitt, J Palardy, A Brooks, E Weiss, R Fischer, H Severinghaus, J |
author_facet |
Doyonisius, M Petrenko, VV Smith, AM Hmiel, B Hua, Q Harth, C Baggenstos, D Bauska, TK Bock, M Beck, J Seth, B Beaudette, R Schmitt, J Palardy, A Brooks, E Weiss, R Fischer, H Severinghaus, J |
author_sort |
Doyonisius, M |
title |
Constraining the sources of the CH4 increase during the Oldest Dryas-Bølling abrupt warming event using 14CH4 measurements from Taylor Glacier, Antarctica |
title_short |
Constraining the sources of the CH4 increase during the Oldest Dryas-Bølling abrupt warming event using 14CH4 measurements from Taylor Glacier, Antarctica |
title_full |
Constraining the sources of the CH4 increase during the Oldest Dryas-Bølling abrupt warming event using 14CH4 measurements from Taylor Glacier, Antarctica |
title_fullStr |
Constraining the sources of the CH4 increase during the Oldest Dryas-Bølling abrupt warming event using 14CH4 measurements from Taylor Glacier, Antarctica |
title_full_unstemmed |
Constraining the sources of the CH4 increase during the Oldest Dryas-Bølling abrupt warming event using 14CH4 measurements from Taylor Glacier, Antarctica |
title_sort |
constraining the sources of the ch4 increase during the oldest dryas-bølling abrupt warming event using 14ch4 measurements from taylor glacier, antarctica |
publisher |
Antarctic Climate and Ecosystems Cooperative Research Centre |
publishDate |
2020 |
url |
http://apo.ansto.gov.au/dspace/handle/10238/9542 https://static1.squarespace.com/static/5459b25de4b00ee921cd006d/t/56dce081c2ea51eadac2f4e1/1457315995517/IPICS+2016+-+Abstracts.pdf |
long_lat |
ENVELOPE(162.167,162.167,-77.733,-77.733) |
geographic |
Antarctic Arctic Greenland Taylor Glacier |
geographic_facet |
Antarctic Arctic Greenland Taylor Glacier |
genre |
Antarc* Antarctic Antarctica Arctic glacier Greenland Ice permafrost Taylor Glacier |
genre_facet |
Antarc* Antarctic Antarctica Arctic glacier Greenland Ice permafrost Taylor Glacier |
op_relation |
Doyonisius, M., Petrenko, V. V., Smith, A., Hmiel, B., Hua, Q., Harth, C., Baggenstos, D., Bauska, T., Bauska, T., Bock, M., Beck, J., Seth, B., Baudette, R., Schmitt, J., Palardy, A., Brooks, E., Weiss, R., Fischer, H., Severinghaus, J. (2016). Constraining the sources of the CH4 increase during the Oldest Dryas-Bølling abrupt warming event using 14CH4 measurements from Taylor Glacier, Antarctica. Paper presented at the IPICS 2016, International Partnerships in Ice Core Sciences, Secon Open Science Conference, 7-11 March 2016, Hobart, Tasmania. https://static1.squarespace.com/static/5459b25de4b00ee921cd006d/t/56dce081c2ea51eadac2f4e1/1457315995517/IPICS+2016+-+Abstracts.pdf http://apo.ansto.gov.au/dspace/handle/10238/9542 |
_version_ |
1766076322497429504 |