Late Glacial to Holocene radiocarbon constraints on North Pacific Intermediate Water ventilation and deglacial atmospheric CO2 sources
Radiocarbon reconstructions of past ocean ventilation rates constrain oceanic sources and sinks of CO2 and mechanisms of subsurface hypoxia. Here, 14C in coexisting benthic and planktonic foraminifera from a sediment core 682 m deep off Southeast Alaska documents paleoventilation over the past ∼17,0...
Published in: | Earth and Planetary Science Letters |
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ftanucanberra:oai:openresearch-repository.anu.edu.au:1885/103463 2024-01-14T10:04:43+01:00 Late Glacial to Holocene radiocarbon constraints on North Pacific Intermediate Water ventilation and deglacial atmospheric CO2 sources Davies, Maureen Mix, Alan C. Stoner, Joseph S Southon, J Cheseby, M. Xuan, C. http://hdl.handle.net/1885/103463 https://doi.org/10.1016/j.epsl.2014.04.004 https://openresearch-repository.anu.edu.au/bitstream/1885/103463/5/01_Davies_Late_Glacial_to_Holocene_2014.pdf.jpg unknown Elsevier 0012-821X http://hdl.handle.net/1885/103463 doi:10.1016/j.epsl.2014.04.004 https://openresearch-repository.anu.edu.au/bitstream/1885/103463/5/01_Davies_Late_Glacial_to_Holocene_2014.pdf.jpg Earth and Planetary Science Letters Journal article ftanucanberra https://doi.org/10.1016/j.epsl.2014.04.004 2023-12-15T09:37:24Z Radiocarbon reconstructions of past ocean ventilation rates constrain oceanic sources and sinks of CO2 and mechanisms of subsurface hypoxia. Here, 14C in coexisting benthic and planktonic foraminifera from a sediment core 682 m deep off Southeast Alaska documents paleoventilation over the past ∼17,000 years. A chronology based on calibrated planktonic foraminiferal dates, consistent with independent terrestrial dates for regional glacial retreat, yields deglacial projection ages moderately greater than those of the Holocene, suggesting comparatively limited ventilation. The observed Holocene increase of apparent ventilation at intermediate depths tracks inundation of the Bering Strait between ∼11,800 and 13,200 years ago, suggesting that flooding of continental shelves and export of low-salinity surface waters to the Arctic enhanced intermediate water formation in the North Pacific. An abrupt increase in the benthic–planktonic radiocarbon age gradient, implying homogenization of abyssal radiocarbon in deep and intermediate waters, aligns with the younger of two episodes of rapid rise of atmospheric CO2 and depletion of atmospheric View the MathML source during deglaciation (∼11,500–13,000 years ago), suggesting the North Pacific as a possible pathway for venting of oceanic CO2 to the atmosphere during the second half of the deglacial transition. Article in Journal/Newspaper Arctic Bering Strait Foraminifera* Planktonic foraminifera Alaska Australian National University: ANU Digital Collections Arctic Bering Strait Pacific Earth and Planetary Science Letters 397 57 66 |
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Australian National University: ANU Digital Collections |
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ftanucanberra |
language |
unknown |
description |
Radiocarbon reconstructions of past ocean ventilation rates constrain oceanic sources and sinks of CO2 and mechanisms of subsurface hypoxia. Here, 14C in coexisting benthic and planktonic foraminifera from a sediment core 682 m deep off Southeast Alaska documents paleoventilation over the past ∼17,000 years. A chronology based on calibrated planktonic foraminiferal dates, consistent with independent terrestrial dates for regional glacial retreat, yields deglacial projection ages moderately greater than those of the Holocene, suggesting comparatively limited ventilation. The observed Holocene increase of apparent ventilation at intermediate depths tracks inundation of the Bering Strait between ∼11,800 and 13,200 years ago, suggesting that flooding of continental shelves and export of low-salinity surface waters to the Arctic enhanced intermediate water formation in the North Pacific. An abrupt increase in the benthic–planktonic radiocarbon age gradient, implying homogenization of abyssal radiocarbon in deep and intermediate waters, aligns with the younger of two episodes of rapid rise of atmospheric CO2 and depletion of atmospheric View the MathML source during deglaciation (∼11,500–13,000 years ago), suggesting the North Pacific as a possible pathway for venting of oceanic CO2 to the atmosphere during the second half of the deglacial transition. |
format |
Article in Journal/Newspaper |
author |
Davies, Maureen Mix, Alan C. Stoner, Joseph S Southon, J Cheseby, M. Xuan, C. |
spellingShingle |
Davies, Maureen Mix, Alan C. Stoner, Joseph S Southon, J Cheseby, M. Xuan, C. Late Glacial to Holocene radiocarbon constraints on North Pacific Intermediate Water ventilation and deglacial atmospheric CO2 sources |
author_facet |
Davies, Maureen Mix, Alan C. Stoner, Joseph S Southon, J Cheseby, M. Xuan, C. |
author_sort |
Davies, Maureen |
title |
Late Glacial to Holocene radiocarbon constraints on North Pacific Intermediate Water ventilation and deglacial atmospheric CO2 sources |
title_short |
Late Glacial to Holocene radiocarbon constraints on North Pacific Intermediate Water ventilation and deglacial atmospheric CO2 sources |
title_full |
Late Glacial to Holocene radiocarbon constraints on North Pacific Intermediate Water ventilation and deglacial atmospheric CO2 sources |
title_fullStr |
Late Glacial to Holocene radiocarbon constraints on North Pacific Intermediate Water ventilation and deglacial atmospheric CO2 sources |
title_full_unstemmed |
Late Glacial to Holocene radiocarbon constraints on North Pacific Intermediate Water ventilation and deglacial atmospheric CO2 sources |
title_sort |
late glacial to holocene radiocarbon constraints on north pacific intermediate water ventilation and deglacial atmospheric co2 sources |
publisher |
Elsevier |
url |
http://hdl.handle.net/1885/103463 https://doi.org/10.1016/j.epsl.2014.04.004 https://openresearch-repository.anu.edu.au/bitstream/1885/103463/5/01_Davies_Late_Glacial_to_Holocene_2014.pdf.jpg |
geographic |
Arctic Bering Strait Pacific |
geographic_facet |
Arctic Bering Strait Pacific |
genre |
Arctic Bering Strait Foraminifera* Planktonic foraminifera Alaska |
genre_facet |
Arctic Bering Strait Foraminifera* Planktonic foraminifera Alaska |
op_source |
Earth and Planetary Science Letters |
op_relation |
0012-821X http://hdl.handle.net/1885/103463 doi:10.1016/j.epsl.2014.04.004 https://openresearch-repository.anu.edu.au/bitstream/1885/103463/5/01_Davies_Late_Glacial_to_Holocene_2014.pdf.jpg |
op_doi |
https://doi.org/10.1016/j.epsl.2014.04.004 |
container_title |
Earth and Planetary Science Letters |
container_volume |
397 |
container_start_page |
57 |
op_container_end_page |
66 |
_version_ |
1788059201926332416 |