Effects of abrupt changes in the Atlantic meridional overturning circulation over deep-water masses: an isotopic approach

• Grant number: 13/22521-2
• Support Opportunities: Scholarships in Brazil - Doctorate (Direct)
• Start date: March 01, 2014
• End date: November 30, 2017
• Field of knowledge: Physical Sciences and Mathematics - Oceanography - Geological Oceanography
• Principal Investigator: Cristiano Mazur Chiessi
• Grantee: Stefano Crivellari
• Host Institution: Escola de Artes, Ciências e Humanidades (EACH). Universidade de São Paulo (USP). São Paulo , SP, Brazil
• Associated research grant: 12/17517-3 - Response of the Western Atlantic Ocean to changes in the Atlantic meridional overturning circulation: from millennial to seasonal variability, AP.PFPMCG.JP

Abstract

The Atlantic meridional overturning circulation is a key component of the climate system. Conceptual models suggest that periods of abrupt climate change of the late Quaternary should be associated to marked modifications in the geometry of deep-water masses in the western equatorial Atlantic. Nevertheless, the verification of this hypothesis remains elusive, mainly due to the lack of suitable paleoceanographic records. In this project we will use oxygen and carbon isotopic results from benthic foraminifera to: (i) reconstruct deep-water geometry in the western equatorial Atlantic during the late Quaternary; (ii) investigate the presence/absence of a relationship between changes in deep-water mass geometry and modifications in the strength of the Atlantic meridional overturning circulation; and (iii) suggest a mechanism able to couple both phenomena. (AU)

Scientific publications

(References retrieved automatically from Web of Science and SciELO through information on FAPESP grants and their corresponding numbers as mentioned in the publications by the authors)

CRIVELLARI, STEFANO; CHIESSI, CRISTIANO MAZUR; KUHNERT, HENNING; HAGGI, CHRISTOPH; PORTILHO-RAMOS, RODRIGO DA COSTA; ZENG, JING-YING; ZHANG, YANCHENG; SCHEFUSS, ENNO; MOLLENHAUER, GESINE; HEFTER, JENS; et al. Increased Amazon freshwater discharge during late Heinrich Stadial 1. QUATERNARY SCIENCE REVIEWS, v. 181, p. 144-155, FEB 1 2018. (12/17517-3, 13/22521-2)

CRIVELLARI, STEFANO; CHIESSI, CRISTIANO MAZUR; KUHNERT, HENNING; HAEGGI, CHRISTOPH; MOLLENHAUER, GESINE; HEFTER, JENS; PORTILHO-RAMOS, RODRIGO; SCHEFUSS, ENNO; MULITZA, STEFAN. Thermal response of the western tropical Atlantic to slowdown of the Atlantic Meridional Overturning Circulation. Earth and Planetary Science Letters, v. 519, p. 120-129, AUG 1 2019. (13/22521-2, 12/17517-3)

Academic Publications

(References retrieved automatically from State of São Paulo Research Institutions)

CRIVELLARI, Stefano. Effects of abrupt changes in the Atlantic meridional overturning circulation over the Amazon Basin: an isotopic and elemental approach. 2018. Doctoral Thesis - Universidade de São Paulo (USP). Instituto de Geociências (IG/BT) São Paulo.