Tropical South Atlantic influence on Northeastern Brazil precipitation and ITCZ displacement during the past 2300 years

Author(s):Show less -

Utida, Giselle ^[1] ; Cruz, Francisco W. ^[1] ; Etourneau, Johan ^[2] ; Bouloubassi, Ioanna ^[3] ; Schefuss, Enno ^[4] ; Vuille, Mathias ^[5] ; Novello, Valdir F. ^[1] ; Prado, Luciana F. ^[6] ; Sifeddine, Abdelfettah ^{[3, 7]} ; Klein, Vincent ^[3] ; Zular, Andre ^[1] ; Viana, Joao C. C. ^[8] ; Turcq, Bruno ^{[3, 7]}

Affiliation

^[1] Univ Sao Paulo, Geosci Inst, Rua Lago 562, BR-05508080 Sao Paulo - Brazil

^[2] Univ Granada, CSIC, Andaluz Inst Earth Sci, Granada - Spain

^[3] UPMC Univ Paris 06, Sorbonne Univ, CNRS, IRD, MNHN, LOCEAN Lab, Ctr IRD France Nord, F-93143 Bondy - France

^[4] Univ Bremen, MARUM Ctr Marine Environm Sci, D-28359 Bremen - Germany

^[5] SUNY Albany, Dept Atmospher & Environm Sci, Albany, NY 12222 - USA

^[6] Univ Brasilia, Geosci Inst, BR-70910900 Brasilia, DF - Brazil

^[7] Fluminense Fed Univ, Dept Geochesmistry, BR-24020141 Niteroi, RJ - Brazil

^[8] Univ Fed Bahia, Inst Biol, BR-40170115 Salvador, BA - Brazil

• Document type: Journal article
• Source: SCIENTIFIC REPORTS; v. 9, FEB 8 2019.
• Web of Science Citations: 3

Abstract

Recent paleoclimatic studies suggest that changes in the tropical rainbelt across the Atlantic Ocean during the past two millennia are linked to a latitudinal shift of the Intertropical Convergence Zone (ITCZ) driven by the Northern Hemisphere (NH) climate. However, little is known regarding other potential drivers that can affect tropical Atlantic rainfall, mainly due to the scarcity of adequate and high-resolution records. In this study, we fill this gap by reconstructing precipitation changes in Northeastern Brazil during the last 2,300 years from a high-resolution lake record of hydrogen isotope compositions of plant waxes. We find that regional precipitation along the coastal area of South America was not solely governed by north-south displacements of the ITCZ due to changes in NH climate, but also by the contraction and expansion of the tropical rainbelt due to variations in sea surface temperature and southeast trade winds in the tropical South Atlantic Basin. (AU)

• FAPESP's process: 17/50085-3 - PIRE: climate research education in the Americas using tree-ring speleothem examples (PIRE-CREATE)
• Grantee: Francisco William da Cruz Junior
• Support Opportunities: Research Projects - Thematic Grants
• FAPESP's process: 16/15807-5 - Paleoclimate and paleoenvironmental reconstructions over the last glacial period in the mid-west Brazil
• Grantee: Valdir Felipe Novello
• Support Opportunities: Scholarships in Brazil - Post-Doctoral