Carbon isotopes characterize rapid changes in atmospheric carbon dioxide during the last deglaciation
An understanding of the mechanisms that control CO2 change during glacial-interglacial cycles remains elusive. Here we help to constrain changing sources with a high-precision, high-resolution deglacial record of the stable isotopic composition of carbon in CO2(δ(13)C-CO2) in air extracted from ice...
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ftcdlib:oai:escholarship.org:ark:/13030/qt5hc8m4h7 2023-10-25T01:32:03+02:00 Carbon isotopes characterize rapid changes in atmospheric carbon dioxide during the last deglaciation Bauska, Thomas K Baggenstos, Daniel Brook, Edward J Mix, Alan C Marcott, Shaun A Petrenko, Vasilii V Schaefer, Hinrich Severinghaus, Jeffrey P Lee, James E 3465 - 3470 2016-03-29 application/pdf https://escholarship.org/uc/item/5hc8m4h7 unknown eScholarship, University of California qt5hc8m4h7 https://escholarship.org/uc/item/5hc8m4h7 public Proceedings of the National Academy of Sciences of the United States of America, vol 113, iss 13 Earth Sciences Physical Geography and Environmental Geoscience Geology Climate Action Life Below Water ice cores paleoclimate carbon cycle atmospheric CO2 last deglaciation article 2016 ftcdlib 2023-09-25T18:04:35Z An understanding of the mechanisms that control CO2 change during glacial-interglacial cycles remains elusive. Here we help to constrain changing sources with a high-precision, high-resolution deglacial record of the stable isotopic composition of carbon in CO2(δ(13)C-CO2) in air extracted from ice samples from Taylor Glacier, Antarctica. During the initial rise in atmospheric CO2 from 17.6 to 15.5 ka, these data demarcate a decrease in δ(13)C-CO2, likely due to a weakened oceanic biological pump. From 15.5 to 11.5 ka, the continued atmospheric CO2 rise of 40 ppm is associated with small changes in δ(13)C-CO2, consistent with a nearly equal contribution from a further weakening of the biological pump and rising ocean temperature. These two trends, related to marine sources, are punctuated at 16.3 and 12.9 ka with abrupt, century-scale perturbations in δ(13)C-CO2 that suggest rapid oxidation of organic land carbon or enhanced air-sea gas exchange in the Southern Ocean. Additional century-scale increases in atmospheric CO2 coincident with increases in atmospheric CH4 and Northern Hemisphere temperature at the onset of the Bølling (14.6-14.3 ka) and Holocene (11.6-11.4 ka) intervals are associated with small changes in δ(13)C-CO2, suggesting a combination of sources that included rising surface ocean temperature. Article in Journal/Newspaper Antarc* Antarctica Southern Ocean Taylor Glacier University of California: eScholarship Southern Ocean Taylor Glacier ENVELOPE(162.167,162.167,-77.733,-77.733) |
institution |
Open Polar |
collection |
University of California: eScholarship |
op_collection_id |
ftcdlib |
language |
unknown |
topic |
Earth Sciences Physical Geography and Environmental Geoscience Geology Climate Action Life Below Water ice cores paleoclimate carbon cycle atmospheric CO2 last deglaciation |
spellingShingle |
Earth Sciences Physical Geography and Environmental Geoscience Geology Climate Action Life Below Water ice cores paleoclimate carbon cycle atmospheric CO2 last deglaciation Bauska, Thomas K Baggenstos, Daniel Brook, Edward J Mix, Alan C Marcott, Shaun A Petrenko, Vasilii V Schaefer, Hinrich Severinghaus, Jeffrey P Lee, James E Carbon isotopes characterize rapid changes in atmospheric carbon dioxide during the last deglaciation |
topic_facet |
Earth Sciences Physical Geography and Environmental Geoscience Geology Climate Action Life Below Water ice cores paleoclimate carbon cycle atmospheric CO2 last deglaciation |
description |
An understanding of the mechanisms that control CO2 change during glacial-interglacial cycles remains elusive. Here we help to constrain changing sources with a high-precision, high-resolution deglacial record of the stable isotopic composition of carbon in CO2(δ(13)C-CO2) in air extracted from ice samples from Taylor Glacier, Antarctica. During the initial rise in atmospheric CO2 from 17.6 to 15.5 ka, these data demarcate a decrease in δ(13)C-CO2, likely due to a weakened oceanic biological pump. From 15.5 to 11.5 ka, the continued atmospheric CO2 rise of 40 ppm is associated with small changes in δ(13)C-CO2, consistent with a nearly equal contribution from a further weakening of the biological pump and rising ocean temperature. These two trends, related to marine sources, are punctuated at 16.3 and 12.9 ka with abrupt, century-scale perturbations in δ(13)C-CO2 that suggest rapid oxidation of organic land carbon or enhanced air-sea gas exchange in the Southern Ocean. Additional century-scale increases in atmospheric CO2 coincident with increases in atmospheric CH4 and Northern Hemisphere temperature at the onset of the Bølling (14.6-14.3 ka) and Holocene (11.6-11.4 ka) intervals are associated with small changes in δ(13)C-CO2, suggesting a combination of sources that included rising surface ocean temperature. |
format |
Article in Journal/Newspaper |
author |
Bauska, Thomas K Baggenstos, Daniel Brook, Edward J Mix, Alan C Marcott, Shaun A Petrenko, Vasilii V Schaefer, Hinrich Severinghaus, Jeffrey P Lee, James E |
author_facet |
Bauska, Thomas K Baggenstos, Daniel Brook, Edward J Mix, Alan C Marcott, Shaun A Petrenko, Vasilii V Schaefer, Hinrich Severinghaus, Jeffrey P Lee, James E |
author_sort |
Bauska, Thomas K |
title |
Carbon isotopes characterize rapid changes in atmospheric carbon dioxide during the last deglaciation |
title_short |
Carbon isotopes characterize rapid changes in atmospheric carbon dioxide during the last deglaciation |
title_full |
Carbon isotopes characterize rapid changes in atmospheric carbon dioxide during the last deglaciation |
title_fullStr |
Carbon isotopes characterize rapid changes in atmospheric carbon dioxide during the last deglaciation |
title_full_unstemmed |
Carbon isotopes characterize rapid changes in atmospheric carbon dioxide during the last deglaciation |
title_sort |
carbon isotopes characterize rapid changes in atmospheric carbon dioxide during the last deglaciation |
publisher |
eScholarship, University of California |
publishDate |
2016 |
url |
https://escholarship.org/uc/item/5hc8m4h7 |
op_coverage |
3465 - 3470 |
long_lat |
ENVELOPE(162.167,162.167,-77.733,-77.733) |
geographic |
Southern Ocean Taylor Glacier |
geographic_facet |
Southern Ocean Taylor Glacier |
genre |
Antarc* Antarctica Southern Ocean Taylor Glacier |
genre_facet |
Antarc* Antarctica Southern Ocean Taylor Glacier |
op_source |
Proceedings of the National Academy of Sciences of the United States of America, vol 113, iss 13 |
op_relation |
qt5hc8m4h7 https://escholarship.org/uc/item/5hc8m4h7 |
op_rights |
public |
_version_ |
1780727631005614080 |