Trace Metal Evidence for Deglacial Ventilation of the Abyssal Pacific and Southern Oceans
The deep ocean has long been recognized as the reservoir that stores the carbon dioxide (COâ‚‚) removed from the atmosphere during Pleistocene glacial periods. The removal of glacial atmospheric COâ‚‚ into the ocean is likely modulated by an increase in the degree of utilization of macronutrients at...
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American Geophysical Union
2021
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Online Access: | https://doi.org/10.1029/2021pa004226 |
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ftcaltechauth:oai:authors.library.caltech.edu:8kne0-91m39 2024-06-23T07:56:55+00:00 Trace Metal Evidence for Deglacial Ventilation of the Abyssal Pacific and Southern Oceans Pavia, Frank J. Wang, Shouyi Middleton, Jennifer Murray, Richard W. Anderson, Robert F. 2021-09 https://doi.org/10.1029/2021pa004226 unknown American Geophysical Union https://www.ncdc.noaa.gov/paleo-search/study/31312 https://www.ncdc.noaa.gov/paleo-search/study/32373 https://doi.org/10.1029/2021pa004226 oai:authors.library.caltech.edu:8kne0-91m39 eprintid:110977 resolverid:CaltechAUTHORS:20210921-202123430 info:eu-repo/semantics/openAccess Other Paleoceanography and Paleoclimatology, 36(9), Art. No. e2021PA004226, (2021-09) manganese Southern Ocean Pacific Ocean respired carbon bottom water oxygen deglaciations info:eu-repo/semantics/article 2021 ftcaltechauth https://doi.org/10.1029/2021pa004226 2024-06-12T06:32:40Z The deep ocean has long been recognized as the reservoir that stores the carbon dioxide (CO₂) removed from the atmosphere during Pleistocene glacial periods. The removal of glacial atmospheric CO₂ into the ocean is likely modulated by an increase in the degree of utilization of macronutrients at the sea surface and enhanced storage of respired CO₂ in the deep ocean, known as enhanced efficiency of the biological pump. Enhanced biological pump efficiency during glacial periods is most easily documented in the deep ocean using proxies for oxygen concentrations, which are directly linked to respiratory CO₂ levels. We document the enhanced storage of respired CO₂ during the Last Glacial Maximum (LGM) in the Pacific Southern Ocean and deepest Equatorial Pacific using records of deglacial authigenic manganese, which form as relict peaks during increases in bottom water oxygen (BWO) concentration. These peaks are found at depths and regions where other oxygenation histories have been ambiguous, due to diagenetic alteration of authigenic uranium, another proxy for BWO. Our results require that the entirety of the abyssal Pacific below approximately 1,000 m was enriched in respired CO₂ and depleted in oxygen during the LGM. The presence of authigenic Mn enrichment in the deep Equatorial Pacific for each of the last five deglaciations suggests that the storage of respired CO₂ in the deep ocean is a ubiquitous feature of late-Pleistocene ice ages. © 2021. American Geophysical Union. Issue Online: 30 August 2021; Version of Record online: 30 August 2021; Accepted manuscript online: 17 August 2021; Manuscript accepted: 09 August 2021; Manuscript revised: 23 June 2021; Manuscript received: 18 January 2021. This work was performed with support from the National Science Foundation (NSF) over about 30 years. The TT013 and NBP9802 cores were collected during the U.S. JGOFS program. Their collection and analyses were supported by NSF OCE-9022301 and OPP-95303398 to R. F. Anderson, and NSF OCE 9301097 to R. W. ... Article in Journal/Newspaper Southern Ocean Caltech Authors (California Institute of Technology) Pacific Southern Ocean Paleoceanography and Paleoclimatology 36 9 |
institution |
Open Polar |
collection |
Caltech Authors (California Institute of Technology) |
op_collection_id |
ftcaltechauth |
language |
unknown |
topic |
manganese Southern Ocean Pacific Ocean respired carbon bottom water oxygen deglaciations |
spellingShingle |
manganese Southern Ocean Pacific Ocean respired carbon bottom water oxygen deglaciations Pavia, Frank J. Wang, Shouyi Middleton, Jennifer Murray, Richard W. Anderson, Robert F. Trace Metal Evidence for Deglacial Ventilation of the Abyssal Pacific and Southern Oceans |
topic_facet |
manganese Southern Ocean Pacific Ocean respired carbon bottom water oxygen deglaciations |
description |
The deep ocean has long been recognized as the reservoir that stores the carbon dioxide (CO₂) removed from the atmosphere during Pleistocene glacial periods. The removal of glacial atmospheric CO₂ into the ocean is likely modulated by an increase in the degree of utilization of macronutrients at the sea surface and enhanced storage of respired CO₂ in the deep ocean, known as enhanced efficiency of the biological pump. Enhanced biological pump efficiency during glacial periods is most easily documented in the deep ocean using proxies for oxygen concentrations, which are directly linked to respiratory CO₂ levels. We document the enhanced storage of respired CO₂ during the Last Glacial Maximum (LGM) in the Pacific Southern Ocean and deepest Equatorial Pacific using records of deglacial authigenic manganese, which form as relict peaks during increases in bottom water oxygen (BWO) concentration. These peaks are found at depths and regions where other oxygenation histories have been ambiguous, due to diagenetic alteration of authigenic uranium, another proxy for BWO. Our results require that the entirety of the abyssal Pacific below approximately 1,000 m was enriched in respired CO₂ and depleted in oxygen during the LGM. The presence of authigenic Mn enrichment in the deep Equatorial Pacific for each of the last five deglaciations suggests that the storage of respired CO₂ in the deep ocean is a ubiquitous feature of late-Pleistocene ice ages. © 2021. American Geophysical Union. Issue Online: 30 August 2021; Version of Record online: 30 August 2021; Accepted manuscript online: 17 August 2021; Manuscript accepted: 09 August 2021; Manuscript revised: 23 June 2021; Manuscript received: 18 January 2021. This work was performed with support from the National Science Foundation (NSF) over about 30 years. The TT013 and NBP9802 cores were collected during the U.S. JGOFS program. Their collection and analyses were supported by NSF OCE-9022301 and OPP-95303398 to R. F. Anderson, and NSF OCE 9301097 to R. W. ... |
format |
Article in Journal/Newspaper |
author |
Pavia, Frank J. Wang, Shouyi Middleton, Jennifer Murray, Richard W. Anderson, Robert F. |
author_facet |
Pavia, Frank J. Wang, Shouyi Middleton, Jennifer Murray, Richard W. Anderson, Robert F. |
author_sort |
Pavia, Frank J. |
title |
Trace Metal Evidence for Deglacial Ventilation of the Abyssal Pacific and Southern Oceans |
title_short |
Trace Metal Evidence for Deglacial Ventilation of the Abyssal Pacific and Southern Oceans |
title_full |
Trace Metal Evidence for Deglacial Ventilation of the Abyssal Pacific and Southern Oceans |
title_fullStr |
Trace Metal Evidence for Deglacial Ventilation of the Abyssal Pacific and Southern Oceans |
title_full_unstemmed |
Trace Metal Evidence for Deglacial Ventilation of the Abyssal Pacific and Southern Oceans |
title_sort |
trace metal evidence for deglacial ventilation of the abyssal pacific and southern oceans |
publisher |
American Geophysical Union |
publishDate |
2021 |
url |
https://doi.org/10.1029/2021pa004226 |
geographic |
Pacific Southern Ocean |
geographic_facet |
Pacific Southern Ocean |
genre |
Southern Ocean |
genre_facet |
Southern Ocean |
op_source |
Paleoceanography and Paleoclimatology, 36(9), Art. No. e2021PA004226, (2021-09) |
op_relation |
https://www.ncdc.noaa.gov/paleo-search/study/31312 https://www.ncdc.noaa.gov/paleo-search/study/32373 https://doi.org/10.1029/2021pa004226 oai:authors.library.caltech.edu:8kne0-91m39 eprintid:110977 resolverid:CaltechAUTHORS:20210921-202123430 |
op_rights |
info:eu-repo/semantics/openAccess Other |
op_doi |
https://doi.org/10.1029/2021pa004226 |
container_title |
Paleoceanography and Paleoclimatology |
container_volume |
36 |
container_issue |
9 |
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1802650317265829888 |