Advanced search
Start date
Betweenand
Related content
(Reference retrieved automatically from Web of Science through information on FAPESP grant and its corresponding number as mentioned in the publication by the authors.)

Abyssal oceanic circulation and acidification during the Middle Eocene Climatic Optimum (MECO)

Full text
Author(s):
Cornaggia, Flaminia [1] ; Bernardini, Simone [2] ; Giorgioni, Martino [3] ; Silva, Gabriel L. X. [1, 4] ; Nagy, Andre Istvan M. [5] ; Jovane, Luigi [1]
Total Authors: 6
Affiliation:
[1] Univ Sao Paulo, Inst Oceanog, Sao Paulo - Brazil
[2] Univ Roma Tre, Dipartimento Sci, Rome - Italy
[3] Univ Brasilia, Inst Geociencias, Brasilia, DF - Brazil
[4] INPE Inst Nacl Pesquisas Espaciais, Sao Jose Dos Campos SP, SP - Brazil
[5] Fac Amer, Dept AI, Goiania, Go - Brazil
Total Affiliations: 5
Document type: Journal article
Source: SCIENTIFIC REPORTS; v. 10, n. 1 APR 21 2020.
Web of Science Citations: 0
Abstract

The Middle Eocene Climatic Optimum (MECO) is a global warming event that occurred at around 40Ma and lasted about 500 kyr. We study this event in an abyssal setting of the Tasman Sea, using the IODP Core U1511B-16R, collected during the expedition 371. We analyse magnetic, mineralogical, and chemical parameters to investigate the evolution of the sea bottom conditions at this site during the middle Eocene. We observe significant changes indicating the response to the MECO perturbation. Mn oxides, in which Mn occurs under an oxidation state around +4, indicate a high Eh water environment. A prominent Mn anomaly, occurring just above the MECO interval, indicates a shift toward higher pH conditions shortly after the end of this event. Our results suggest more acid bottom water over the Tasman abyssal plain during the MECO, and an abrupt end of these conditions. This work provides the first evidence of MECO at abyssal depths and shows that acidification affected the entire oceanic water column during this event. (AU)

FAPESP's process: 16/24946-9 - Sea-level changes and Global Monsoon System: clues from marine cores in Brazil
Grantee:Luigi Jovane
Support Opportunities: Research Program on Global Climate Change - Thematic Grants
FAPESP's process: 11/22018-3 - Primary productivity in oceans studying magnetotactic bacteria in sediments
Grantee:Luigi Jovane
Support Opportunities: Research Program on Global Climate Change - Young Investigators
FAPESP's process: 18/17061-6 - Relationship between environment and magnetotactic bacteria
Grantee:Luigi Jovane
Support Opportunities: Research Program on Global Climate Change - Regular Grants