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Calcium carbonate cycling in the Southern Ocean: insights from dissolved calcium and potential alkalinity tracers

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dc.contributor.authorSun, Yaojiaen
dc.contributor.authorEllwood, Michael J.en
dc.date.accessioned2025-06-30T18:38:52Z
dc.date.available2025-06-30T18:38:52Z
dc.date.issued2025en
dc.description.abstractThe cycling of calcium carbonate (CaCO3) plays a significant role in deep-water carbon sequestration and affects the buffer capacity of the upper ocean for absorbing atmospheric CO2. This study investigates the role of dissolved calcium (Ca) and potential alkalinity (PA) as tracers for CaCO3 cycling in the Southern Ocean. The correlation between PA and Ca concentrations in subantarctic and polar waters supports their use as effective tracers of the process of CaCO3 dissolution and precipitation. Estimates of particulate inorganic carbon export flux based on Ca concentration reveals substantial contributions in the Southern Ocean, with higher values in the subantarctic waters. These findings highlight the value of Ca and PA as tracers for understanding CaCO3 cycling and its role in carbon sequestration and buffering atmospheric CO2.en
dc.description.sponsorshipThe authors thank Elizabeth Shadwick and Cathryn A. Wynn-Edwards for their valuable comments on the manuscript. We would like to thank Tyler Rohr for collecting the TA samples and Abe Passmore for analyzing them and providing the TA data used in this manuscript. We are grateful to the officers, crew, and research staff of the Marine National Facility and the RV Investigator for their help with sample collection and generation of hydrochemistry data on voyage IN2020_V08. This research was supported by a grant of sea time on RV Investigator from the CSIRO Marine National Facility (https://ror.org/01mae9353). We thank Chief Scientist Philip Boyd (IN2020_V08) for supporting dissolved sample collection for this study. The SOTS observatory is supported by Australia's Integrated Marine Observing System. Integrated Marine Observing System is operated by a consortium of institutions as an unincorporated joint venture, with the University of Tasmania as the Lead Agent. Financial support also came from the Australian Centre for Excellence in Antarctic Science, which is a Special Research Initiative funded by the Australian Research Council (SR200100008). The Australian Government Research Training Program Domestic Scholarship and the ANU Supplementary Scholarship funding to Yaojia Sun are also acknowledged. Open access publishing facilitated by Australian National University, as part of the Wiley - Australian National University agreement via the Council of Australian University Librarians. The authors thank Elizabeth Shadwick and Cathryn A. Wynn\u2010Edwards for their valuable comments on the manuscript. We would like to thank Tyler Rohr for collecting the TA samples and Abe Passmore for analyzing them and providing the TA data used in this manuscript. We are grateful to the officers, crew, and research staff of the Marine National Facility and the RV Investigator for their help with sample collection and generation of hydrochemistry data on voyage IN2020_V08. This research was supported by a grant of sea time on RV Investigator from the CSIRO Marine National Facility ( https://ror.org/01mae9353 ). We thank Chief Scientist Philip Boyd (IN2020_V08) for supporting dissolved sample collection for this study. The SOTS observatory is supported by Australia's Integrated Marine Observing System. Integrated Marine Observing System is operated by a consortium of institutions as an unincorporated joint venture, with the University of Tasmania as the Lead Agent. Financial support also came from the Australian Centre for Excellence in Antarctic Science, which is a Special Research Initiative funded by the Australian Research Council (SR200100008). The Australian Government Research Training Program Domestic Scholarship and the ANU Supplementary Scholarship funding to Yaojia Sun are also acknowledged. Open access publishing facilitated by Australian National University, as part of the Wiley \u2010 Australian National University agreement via the Council of Australian University Librarians.en
dc.description.statusPeer-revieweden
dc.format.extent10en
dc.identifier.scopus105001064976en
dc.identifier.urihttp://www.scopus.com/inward/record.url?scp=105001064976&partnerID=8YFLogxKen
dc.identifier.urihttps://hdl.handle.net/1885/733766001
dc.language.isoenen
dc.provenanceThis is an open access article under the terms of the Creative Commons Attribution License, which permits use, distribution and reproduction in any medium, provided the original work is properly cited.en
dc.rights© 2025 The Author(s). Limnology and Oceanography Letters published by Wiley Periodicals LLC on behalf of Association for the Sciences of Limnology and Oceanography.en
dc.sourceLimnology And Oceanography Lettersen
dc.titleCalcium carbonate cycling in the Southern Ocean: insights from dissolved calcium and potential alkalinity tracersen
dc.typeJournal articleen
dspace.entity.typePublicationen
local.bibliographicCitation.lastpage263en
local.bibliographicCitation.startpage254en
local.contributor.affiliationSun, Yaojia; Research School of Earth Sciences, ANU College of Science and Medicine, The Australian National Universityen
local.contributor.affiliationEllwood, Michael J.; Research School of Earth Sciences, ANU College of Science and Medicine, The Australian National Universityen
local.identifier.citationvolume10en
local.identifier.doi10.1002/lol2.10457en
local.identifier.puree942dbfb-7fc4-4c11-9bd9-719b8c19bca7en
local.identifier.urlhttps://www.scopus.com/pages/publications/105001064976en
local.type.statusPublisheden

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