Carbon cycle instability and orbital forcing during the Middle Eocene Climatic Optimum

Autor(es)

Giorgioni, Martino ^{[1, 2]} ; Jovane, Luigi ^[1] ; Rego, Eric S. ^{[1, 3]} ; Rodelli, Daniel ^[1] ; Frontalini, Fabrizio ^[4] ; Coccioni, Rodolfo ^[4] ; Catanzariti, Rita ^[5] ; Ozcan, Ercan ^[6]

Afiliação do(s) autor(es)

^[1] Univ Sao Paulo, Inst Oceanog, BR-05508120 Sao Paulo - Brazil

^[2] Univ Brasilia, Inst Geociencias, BR-70910900 Brasilia, DF - Brazil

^[3] Univ Sao Paulo, Inst Geociencias, BR-05508080 Sao Paulo - Brazil

^[4] Univ Urbino Carlo Bo, Dipartimento Sci Pure & Applicate DiSPeA, I-61029 Urbino - Italy

^[5] CNR, Ist Geosci & Georisorse, I-56124 Pisa - Italy

^[6] Istanbul Tech Univ, Fac Mines, Dept Geol Engn, TR-34469 Istanbul - Turkey

• Tipo de documento: Artigo Científico
• Fonte: SCIENTIFIC REPORTS; v. 9, JUN 27 2019.
• Citações Web of Science: 1

Resumo

The Middle Eocene Climatic Optimum (MECO) is a global warming event that occurred at about 40 Ma. In comparison to the most known global warming events of the Paleogene, the MECO has some peculiar features that make its interpretation controversial. The main peculiarities of the MECO are a duration of similar to 500 kyr and a carbon isotope signature that varies from site to site. Here we present new carbon and oxygen stable isotopes records (delta C-13 and delta O-18) from three foraminiferal genera dwelling at different depths throughout the water column and the sea bottom during the middle Eocene, from eastern Turkey. We document that the MECO is related to major oceanographic and climatic changes in the Neo-Tethys and also in other oceanic basins. The carbon isotope signature of the MECO is difficult to interpret because it is highly variable from site to site. We hypothesize that such delta(13) signature indicates highly unstable oceanographic and carbon cycle conditions, which may have been forced by the coincidence between a 400 kyr and a 2.4 Myr orbital eccentricity minimum. Such forcing has been also suggested for the Cretaceous Oceanic Anoxic Events, which resemble the MECO event more than the Cenozoic hyperthermals. (AU)

• Processo FAPESP: 11/22018-3 - Avaliação da produtividade primária marinha através do estudo das bactérias magnetotáticas em sedimentos
• Beneficiário: Luigi Jovane
• Modalidade de apoio: Auxílio à Pesquisa - Programa de Pesquisa sobre Mudanças Climáticas Globais - Jovens Pesquisadores
• Processo FAPESP: 15/16501-4 - Variação no aporte de minerais e argilominerais no Oceano Atlântico e Neo-Tethys: novas evidências de aquecimento global durante o Eoceno médio
• Beneficiário: Eric Siciliano Rego
• Modalidade de apoio: Bolsas no Brasil - Mestrado
• Processo FAPESP: 12/15995-5 - Geoquímica dos isótopos estáveis como instrumento para entender a paleoceanografia e o paleoclima no período Eoceno e Oligoceno
• Beneficiário: Martino Giorgioni
• Modalidade de apoio: Bolsas no Brasil - Pós-Doutorado