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Penultimate glacial-to-interglacial transition in Northeastern South America and the adjacent ocean

Grant number: 19/25179-0
Support type:Scholarships in Brazil - Post-Doctorate
Effective date (Start): June 01, 2020
Effective date (End): May 31, 2022
Field of knowledge:Physical Sciences and Mathematics - Geosciences - Geology
Principal researcher:André Oliveira Sawakuchi
Grantee:Marília de Carvalho Campos Garcia
Home Institution: Instituto de Geociências (IGC). Universidade de São Paulo (USP). São Paulo , SP, Brazil
Associated research grant:18/15123-4 - Past perspectives on tipping elements of the climate system: the Amazon Rainforest and the Atlantic Meridional Overturning Circulation (PPTEAM), AP.PFPMCG.JP2

Abstract

The Atlantic Meridional Overturning Circulation (AMOC) plays a fundamental role in the oceanography and climate of the Atlantic realm. A potential shutdown of the AMOC would cause major changes in surface heat distribution in the Atlantic Ocean, strongly affecting tropical South American precipitation. Thus, a comprehensive understanding of the response of the Atlantic Ocean to changes in the AMOC intensity on different time scales is a key issue. Glacial-to-interglacial transitions are unique targets for past climate reconstructions not only because these periods were characterized by major changes in the strength of the AMOC, but also because of the marked changes in atmospheric carbon dioxide and sea level, with the associated impacts on continental hydroclimate. Here we propose to assess the impacts of the penultimate glacial-to-interglacial transition on Northeastern (NE) South America and the adjacent Western Equatorial Atlantic, in unprecedented temporal resolution. Through this research proposal, we expect to: (i) characterize the changes in NE South American hydroclimate, as well as determine the changes in the Western Equatorial Atlantic upper water column structure and bottom water ventilation during the penultimate glacial-to-interglacial transition; and (ii) subsidize the debate of possible impacts that future changes in AMOC may have over the NE South America and the adjacent Western Equatorial Atlantic. (AU)

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