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(Reference retrieved automatically from Web of Science through information on FAPESP grant and its corresponding number as mentioned in the publication by the authors.)

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

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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]
Total Authors: 8
[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
Total Affiliations: 6
Document type: Journal article
Source: SCIENTIFIC REPORTS; v. 9, JUN 27 2019.
Web of Science Citations: 1

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)

FAPESP's process: 15/16501-4 - Variation of minerals and clay minerals recorded in the Atlantic and Neo-Tethys ocean: new evidence of a global warming event in the middle Eocene
Grantee:Eric Siciliano Rego
Support type: Scholarships in Brazil - Master
FAPESP's process: 12/15995-5 - Stable isotope geochemistry as main tool to unravel Eocene-Oligocene paleoclimate and paleoceanography
Grantee:Martino Giorgioni
Support type: Scholarships in Brazil - Post-Doctorate
FAPESP's process: 11/22018-3 - Primary productivity in oceans studying magnetotactic bacteria in sediments
Grantee:Luigi Jovane
Support type: Research Program on Global Climate Change - Young Investigators