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      Coupled changes in western South Atlantic carbon sequestration and particle reactive element cycling during millennial-scale Holocene climate variability

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          Abstract

          Continental shelves have the potential to remove atmospheric carbon dioxide via the biological pump, burying it in seafloor sediments. The efficiency of marine carbon sequestration changes rapidly due to variations in biological productivity, organic carbon oxidation, and burial rate. Here we present a high temporal resolution record of marine carbon sequestration changes from a western South Atlantic shelf site sensitive to Brazil Current-driven upwelling. The comparison of biological records to rare earth element (REE) patterns from authigenic oxides shows a strong relationship between higher biological productivity and stronger particle reactive element cycling (i.e. REE cycling) during rapid climate change events. This is the first evidence that authigenic oxides archive past changes in upper ocean REE cycling by the exported organic carbon. In addition, our data suggest that Brazil Current-driven upwelling varies on millennial-scales and in time with continental precipitation anomalies as registered in Brazilian speleothems during the Holocene. This indicates an ocean–atmosphere control on the biological pump, most probably related to South American monsoon system variability.

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          PAST: Paleontological Statistics Software Package for Education and Data Analysis

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            JNdi-1: a neodymium isotopic reference in consistency with LaJolla neodymium

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              The future of Blue Carbon science

              The term Blue Carbon (BC) was first coined a decade ago to describe the disproportionately large contribution of coastal vegetated ecosystems to global carbon sequestration. The role of BC in climate change mitigation and adaptation has now reached international prominence. To help prioritise future research, we assembled leading experts in the field to agree upon the top-ten pending questions in BC science. Understanding how climate change affects carbon accumulation in mature BC ecosystems and during their restoration was a high priority. Controversial questions included the role of carbonate and macroalgae in BC cycling, and the degree to which greenhouse gases are released following disturbance of BC ecosystems. Scientists seek improved precision of the extent of BC ecosystems; techniques to determine BC provenance; understanding of the factors that influence sequestration in BC ecosystems, with the corresponding value of BC; and the management actions that are effective in enhancing this value. Overall this overview provides a comprehensive road map for the coming decades on future research in BC science.
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                Author and article information

                Contributors
                brunaborbadias@usp.br
                Journal
                Sci Rep
                Sci Rep
                Scientific Reports
                Nature Publishing Group UK (London )
                2045-2322
                21 December 2021
                21 December 2021
                2021
                : 11
                : 24378
                Affiliations
                [1 ]GRID grid.411173.1, ISNI 0000 0001 2184 6919, Departamento de Geoquímica, , Universidade Federal Fluminense, ; Niterói, 24020-141 Brazil
                [2 ]GRID grid.11899.38, ISNI 0000 0004 1937 0722, School of Arts, Sciences and Humanities, , University of São Paulo, ; São Paulo, 03828-000 Brazil
                [3 ]GRID grid.5335.0, ISNI 0000000121885934, Godwin Laboratory for Palaeoclimate Research, Department of Earth Sciences, , University of Cambridge, ; Cambridge, CB2 3EQ UK
                [4 ]GRID grid.419222.e, ISNI 0000 0001 2116 4512, Center for Weather Forecasting and Climate Studies (CPTEC), , National Institute for Space Research (INPE), ; Cachoeira Paulista, 12630-000 Brazil
                [5 ]GRID grid.7704.4, ISNI 0000 0001 2297 4381, MARUM - Center for Marine Environmental Sciences, , University of Bremen, ; Leobener Strasse, D-28359 Bremen, Germany
                Article
                3821
                10.1038/s41598-021-03821-8
                8692323
                34934141
                b5b58f43-923f-4c7a-984d-8df560b99d57
                © The Author(s) 2021

                Open Access This article is licensed under a Creative Commons Attribution 4.0 International License, which permits use, sharing, adaptation, distribution and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons licence, and indicate if changes were made. The images or other third party material in this article are included in the article's Creative Commons licence, unless indicated otherwise in a credit line to the material. If material is not included in the article's Creative Commons licence and your intended use is not permitted by statutory regulation or exceeds the permitted use, you will need to obtain permission directly from the copyright holder. To view a copy of this licence, visit http://creativecommons.org/licenses/by/4.0/.

                History
                : 18 August 2021
                : 29 November 2021
                Funding
                Funded by: FundRef http://dx.doi.org/10.13039/501100002322, Coordenação de Aperfeiçoamento de Pessoal de Nível Superior;
                Award ID: 88887.156152/2017-00
                Award ID: 88881.313535/2019-01
                Award Recipient :
                Funded by: FundRef http://dx.doi.org/10.13039/501100001807, Fundação de Amparo à Pesquisa do Estado de São Paulo;
                Award ID: 20/11452-3
                Award ID: 18/15123-4
                Award Recipient :
                Funded by: FundRef http://dx.doi.org/10.13039/501100003593, Conselho Nacional de Desenvolvimento Científico e Tecnológico;
                Award ID: 312458/2020-7
                Award ID: 302521-2017-8
                Award Recipient :
                Funded by: Alexander von Humboldt Foundation
                Funded by: Petrobras/CENPES Geochemistry Network
                Funded by: National Petroleum Agency of Brazil
                Categories
                Article
                Custom metadata
                © The Author(s) 2021

                Uncategorized
                carbon cycle,element cycles,palaeoceanography,palaeoclimate
                Uncategorized
                carbon cycle, element cycles, palaeoceanography, palaeoclimate

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