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

Autor(es)

Dias, Bruna B. ^{[1, 2]} ; Piotrowski, Alexander M. ^[3] ; Barbosa, Catia F. ^[2] ; Venancio, Igor M. ^{[4, 2, 5]} ; Chiessi, Cristiano M. ^[1] ; Albuquerque, Ana Luiza S. ^[2]

Afiliação do(s) autor(es)

^[1] Univ Sao Paulo, Sch Arts Sci & Humanities, BR-03828000 Sao Paulo - Brazil

^[2] Univ Fed Fluminense, Dept Geoquim, BR-24020141 Niteroi, RJ - Brazil

^[3] Univ Cambridge, Dept Earth Sci, Godwin Lab Palaeoclimate Res, Cambridge CB2 3EQ - England

^[4] Univ Bremen, MARUM Ctr Marine Environm Sci, Leobener Str, D-28359 Bremen - Germany

^[5] Natl Inst Space Res INPE, Ctr Weather Forecasting & Climate Studies CPTEC, BR-12630000 Cachoeira Paulista - Brazil

• Tipo de documento: Artigo Científico
• Fonte: SCIENTIFIC REPORTS; v. 11, n. 1 DEC 21 2021.
• Citações Web of Science: 0

Resumo

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. (AU)

• Processo FAPESP: 20/11452-3 - Mudanças no armazenamento de carbono em profundidades médias do Atlântico Sul durante a penúltima terminação glacial e o Antropoceno
• Beneficiário: Bruna Borba Dias
• Modalidade de apoio: Bolsas no Brasil - Pós-Doutorado
• Processo FAPESP: 18/15123-4 - Perspectivas pretéritas sobre limiares críticos do sistema climático: a Floresta Amazônica e a célula de revolvimento meridional do Atlântico (PPTEAM)
• Beneficiário: Cristiano Mazur Chiessi
• Modalidade de apoio: Auxílio à Pesquisa - Programa de Pesquisa sobre Mudanças Climáticas Globais - Jovens Pesquisadores - Fase 2
• Processo FAPESP: 19/24349-9 - Avaliando os efeitos das mudanças climáticas do passado e do futuro na biodiversidade amazônica (CLAMBIO)
• Beneficiário: Cristiano Mazur Chiessi
• Modalidade de apoio: Auxílio à Pesquisa - Programa BIOTA - Regular