Eccentricity-induced expansions of Brazilian coastal upwelling zones

Autor: Edmundo Camilo Júnior, Thiago P. Santos, Felipe Antonio de Lima Toledo, Ana Cláudia Aoki Santarosa, Ana Luiza Spadano Albuquerque, Karen Badaraco Costa, Douglas Villela de Oliveira Lessa, Igor Martins Venancio
Rok vydání: 2019
Předmět:
Zdroj: Repositório Institucional da USP (Biblioteca Digital da Produção Intelectual)
Universidade de São Paulo (USP)
instacron:USP
ISSN: 0921-8181
Popis: Expansions of coastal upwelling spots along the Brazilian coast were previously reported for Marine Isotope Stage (MIS) 5, but open questions remain regarding the climatic mechanisms and the periodicity of such changes. Based on two marine sediment cores, we provide evidence for multiple intensifications of the upwelling regime off the Southeast Brazilian margin (SBM) during several interglacials and highlight the major role of eccentricity as the responsible forcing. In addition, we show a two-step change in the upwelling regime across the Mid-Brunhes Event (MBE) and an increase in the amplitude of upwelling variability after this climatic transition. Our findings point to substantial modifications of the upwelling regions during several glacial-interglacial transitions that probably altered the regional marine productivity regime and the carbon budget.
Databáze: OpenAIRE
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