Southern Component Water-driven carbonate dissolution and carbon storage during the Last Glacial Maximum in the western South Atlantic

Southern Component Water-driven carbonate dissolution and carbon storage during the Last Glacial Maximum in the western South Atlantic | Authorea try { document.documentElement.classList.add('js'); } catch (e) { } var _gaq = _gaq || []; _gaq.push(['_setAccount', 'G-8VDV14Y67G']); _gaq.push(['_trackPageview']); (function() { var ga = document.createElement('script'); ga.type = 'text/javascript'; ga.async = true; ga.src = ('https:' == document.location.protocol ? 'https://ssl' : 'http://www') + '.google-analytics.com/ga.js'; var s = document.getElementsByTagName('script')[0]; s.parentNode.insertBefore(ga, s); })(); Skip to main content Preprints Collections Wiley Open Research IET Open Research Ecological Society of Japan All Collections About About Authorea FAQs Contact Us Quick Search anywhere Search for preprint articles, keywords, etc. Search Search ADVANCED SEARCH SCROLL This is a preprint and has not been peer reviewed. Data may be preliminary. 17 March 2026 V1 Latest version Share on Southern Component Water-driven carbonate dissolution and carbon storage during the Last Glacial Maximum in the western South Atlantic Authors : Jaime Y. Suárez-Ibarra 0000-0002-0227-4369 [email protected] , Bruna B Dias , Sandro M Petró , Cristiane F Frozza , Sonia Chaabane , Thomas B Chalk , Alexander Piotrowski , Thibault De Garidel-Thoron , and María A G Pivel Authors Info & Affiliations https://doi.org/10.22541/au.177376112.24012833/v1 Published Global and Planetary Change Version of record Peer review timeline 138 views 49 downloads Contents Abstract Supplementary Material Information & Authors Metrics & Citations View Options References Figures Tables Media Share Abstract Late Quaternary glacial-interglacial climate variability is related to the carbon cycle, with its feedback mechanisms amplifying the effects of orbital forcing. These processes account for a ~80-100 ppm change in atmospheric CO₂, and are influenced, in part, by shifts in carbonate production, dissolution, and burial. The southern Brazilian continental margin is close to potential iron fertilisation sources, but the interplay of the region's productivity, water mass geometry, and carbonate dissolution remain underexplored. In this study we investigate core SIS-203 (1,894 mbsl depth), covering the 31-7 ka interval. Planktonic foraminifera proxies indicate low productivity during the Last Glacial Maximum (LGM), with a slight increase during the deglaciation and into the Holocene. Authigenic foraminiferal εNd shows full influence of corrosive Southern Component Water (SCW) during the LGM, and decreased carbonate preservation supports this interpretation. Thus, despite the low biologically mediated dissolution at this site, carbonate preservation decreases during the LGM, similarly observed in other Atlantic basins. We propose that it is through water mass geometry changes (higher influence of SCW) that calcium carbonate preservation is affected. Changes in deep water mass stratification and circulation strengthened deep-ocean carbon sequestration during the LGM in the western South Atlantic, which may be linked to Southern Hemisphere climate dynamics. Supplementary Material File (suarez-ibarra et al. end.pdf) Download 4.85 MB Information & Authors Information Version history V1 Version 1 17 March 2026 Peer review timeline Published Global and Planetary Change Version of Record 1 Jul 2026 Published Copyright This work is licensed under a Creative Commons Attribution-NonCommercial 4.0 International License Keywords neodymium isotopes planktonic foraminifera productivity sortable silt stable isotopes water masses geometry Authors Affiliations Jaime Y. Suárez-Ibarra 0000-0002-0227-4369 [email protected] Institute of Geology and Palaeontology, Faculty of Science, Charles University Aix-Marseille Université, CNRS, INRAE, CEREGE, Europôle Méditerranéen de l'Arbois View all articles by this author Bruna B Dias School of Arts, Sciences and Humanities, Universidade de São Paulo View all articles by this author Sandro M Petró OCEANEON -Instituto Tecnológico de Paleoceanografia e Mudanças Climáticas, Universidade do Vale do Rio dos Sinos View all articles by this author Cristiane F Frozza Instituto de Geociências, Programa de Pós-Graduação em Geociências, Universidade Federal do Rio Grande do Sul Departamento de Geologia, Programa de Pós-Graduação em Geociências, Universidade Federal de Pernambuco View all articles by this author Sonia Chaabane Aix-Marseille Université, CNRS, INRAE, CEREGE, Europôle Méditerranéen de l'Arbois View all articles by this author Thomas B Chalk Aix-Marseille Université, CNRS, INRAE, CEREGE, Europôle Méditerranéen de l'Arbois View all articles by this author Alexander Piotrowski Department of Earth Sciences, University of Cambridge View all articles by this author Thibault De Garidel-Thoron Aix-Marseille Université, CNRS, INRAE, CEREGE, Europôle Méditerranéen de l'Arbois View all articles by this author María A G Pivel Centro de Estudos de Geologia Costeira e Oceânica (CECO), Instituto de Geociências, Universidade Federal do Rio Grande do Sul View all articles by this author Metrics & Citations Metrics Article Usage 138 views 49 downloads .FvxKWukQNSOunydq8rnd { width: 100px; } Citations Download citation Jaime Y. Suárez-Ibarra, Bruna B Dias, Sandro M Petró, et al. Southern Component Water-driven carbonate dissolution and carbon storage during the Last Glacial Maximum in the western South Atlantic. Authorea . 17 March 2026. DOI: https://doi.org/10.22541/au.177376112.24012833/v1 If you have the appropriate software installed, you can download article citation data to the citation manager of your choice. Simply select your manager software from the list below and click Download. For more information or tips please see 'Downloading to a citation manager' in the Help menu . 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