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Trace Metal Evidence for Deglacial Ventilation of the Abyssal Pacific and Southern Oceans

Pavia, Frank J. and Wang, Shouyi and Middleton, Jennifer and Murray, Richard W. and Anderson, Robert F. (2021) Trace Metal Evidence for Deglacial Ventilation of the Abyssal Pacific and Southern Oceans. Paleoceanography and Paleoclimatology, 36 (9). Art. No. e2021PA004226. ISSN 2572-4517. doi:10.1029/2021pa004226. https://resolver.caltech.edu/CaltechAUTHORS:20210921-202123430

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Abstract

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.


Item Type:Article
Related URLs:
URLURL TypeDescription
https://doi.org/10.1029/2021pa004226DOIArticle
https://www.ncdc.noaa.gov/paleo-search/study/31312Related ItemData
https://www.ncdc.noaa.gov/paleo-search/study/32373Related ItemData
ORCID:
AuthorORCID
Pavia, Frank J.0000-0003-3627-0179
Wang, Shouyi0000-0002-9046-6474
Middleton, Jennifer0000-0001-7147-2388
Murray, Richard W.0000-0002-7688-4098
Anderson, Robert F.0000-0002-8472-2494
Additional Information:© 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. Murray. Coring and radiocarbon analyses on NBP1702 were funded by NSF OPP-1542962. XRF analysis on NBP9802 and NBP1702 cores, as well as additional radiocarbon measurements, was funded by an LDEO Climate Center Grant to F. J. Pavia. The LDEO core repository, especially Nichole Anest and Clara Chang, was instrumental in the processing and XRF scanning of the NBP9802 and 1702 cores. We thank the captains, crews, and science parties of the R. V. Thomas G. Thompson and R. V. Nathaniel B. Palmer, as well as Martin Q. Fleisher for support at sea in collecting the sediment cores. Discussions with Kassandra Costa, Allison Jacobel, and Theodore Present improved the quality of the manuscript, as did comments from two anonymous reviewers. Data Availability Statement: All data from this cruise have been submitted to be archived at the NOAA NCEI paleoclimatology data center. NBP1702 and NBP9802 data are available at https://www.ncdc.noaa.gov/paleo-search/study/31312. Data can be found at https://www.ncdc.noaa.gov/paleo-search/study/32373.
Funders:
Funding AgencyGrant Number
NSFOCE-9022301
NSFOPP-95303398
NSFOCE-9301097
NSFOPP-1542962
Lamont-Doherty Earth ObservatoryUNSPECIFIED
Subject Keywords:manganese; Southern Ocean; Pacific Ocean; respired carbon; bottom water oxygen; deglaciations
Issue or Number:9
DOI:10.1029/2021pa004226
Record Number:CaltechAUTHORS:20210921-202123430
Persistent URL:https://resolver.caltech.edu/CaltechAUTHORS:20210921-202123430
Official Citation:Pavia, F. J., Wang, S., Middleton, J., Murray, R. W., & Anderson, R. F. (2021). Trace metal evidence for deglacial ventilation of the abyssal Pacific and Southern Oceans. Paleoceanography and Paleoclimatology, 36, e2021PA004226. https://doi.org/10.1029/2021PA004226
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:110977
Collection:CaltechAUTHORS
Deposited By: Tony Diaz
Deposited On:21 Sep 2021 23:33
Last Modified:21 Sep 2021 23:33

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