| Texto completo | |
| Autor(es): |
Santos, Mylena P.
;
Pereira, Natan S.
;
Chiessi, Cristiano M.
;
Crivellari, Stefano
;
Dias, Bruna B.
;
Zhang, Haiwei
;
Pereira, Madson G.
;
Gomes, Moab P.
;
Prado, Luciana F.
Número total de Autores: 9
|
| Tipo de documento: | Artigo Científico |
| Fonte: | PALEOCEANOGRAPHY AND PALEOCLIMATOLOGY; v. 40, n. 7, p. 14-pg., 2025-07-01. |
| Resumo | |
The Great Acceleration is defined as a series of unprecedented, global human-driven changes that occurred across socio-economic and natural compartments of the Earth system after 1950. Among the observed changes, increase in fossil fuel burning has led to a significant accumulation of carbon dioxide (CO2) in the atmosphere. By absorbing roughly 30% of total anthropogenic CO2 emissions since the 1950s, the ocean is a major carbon sink, but the extent to which the natural oceanic carbon cycle was impacted by anthropogenic CO2 is poorly known. To understand long-term changes in the oceanic carbon cycle, coral reconstructions are important archives of past environmental variables. The stable carbon isotopic composition of corals (delta 13Ccoral) has been considered an important proxy for assessing changes in the isotopic composition of seawater dissolved inorganic carbon (delta 13CDIC), which ultimately reflects isotopic changes in atmospheric CO2 (delta 13CCO2). We use delta 13Ccoral from the western tropical South Atlantic to assess changes in delta 13CDIC to understand regional changes in the oceanic carbon cycle. The coral reconstruction documents significant carbon cycle changes across the pre-to the post-industrial transition, resulting in a delta 13Ccoral decreasing trend of -0.0204 parts per thousand year-1 from 1928 to 2018, which intensified after the 1950s, during the Great Acceleration. Moreover, our delta 13Ccoral reconstruction also shows decadal-scale fluctuations not observed in atmospheric CO2. Our results suggest that the South Atlantic absorbed more anthropogenic CO2 than previously thought and indicate an accelerated decline in delta 13CDIC associated with changes in the ocean carbon cycle. (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 |
| Processo FAPESP: | 22/01056-9 - Aplicação de isótopos de neodímio na reconstrução da variabilidade da AMOC e seu papel no ciclo global do carbono durante as duas últimas terminações glaciais |
| Beneficiário: | Bruna Borba Dias |
| Modalidade de apoio: | Bolsas no Exterior - Estágio de Pesquisa - Pós-Doutorado |