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

Climate changes in Northeastern Brazil from deglacial to Meghalayan periods and related environmental impacts

Full text
Author(s):
Show less -
Utida, Giselle [1] ; Cruz, Francisco W. [1] ; Santos, Roberto V. [2] ; Sawakuchi, Andre O. [1] ; Wang, Hong [3] ; Pessenda, Luiz C. R. [4] ; Novello, Valdir F. [1] ; Vuille, Mathias [5] ; Strauss, Andre M. [6] ; Borella, Ana Claudia [6] ; Strikis, Nicolas M. [7] ; Guedes, Carlos C. F. [8] ; Dias De Andrade, Fabio Ramos [1] ; Zhang, Haiwei [9] ; Cheng, Hai [9, 10, 11] ; Edwards, R. Lawrence [12]
Total Authors: 16
Affiliation:
Show less -
[1] Univ Sao Paulo, Inst Geociencias, Rua Lago 562, BR-05508090 Sao Paulo, SP - Brazil
[2] Univ Brasilia, Dept Geol, Brasilia, DF - Brazil
[3] Beijing Normal Univ, Interdisciplinary Res Ctr Earth Sci Frontier, Beijing - Peoples R China
[4] Univ Sao Paulo, 14C Lab, Piracicaba, SP - Brazil
[5] SUNY Albany, Dept Atmospher & Environm Sci, Albany, NY - USA
[6] Univ Sao Paulo, Museu Arqueol & Etnol, Sao Paulo, SP - Brazil
[7] Univ Fed Fluminense, Dept Geoquim, Niteroi, RJ - Brazil
[8] Univ Fed Parana, Dept Geol, Curitiba, Parana - Brazil
[9] Xi An Jiao Tong Univ, Inst Global Environm Change, Xian 710054 - Peoples R China
[10] Chinese Acad Sci, Inst Earth Environm, State Key Lab Loess & Quaternary Geol, Xian 710061 - Peoples R China
[11] Inst Karst Geol, Key Lab Karst Dynam, MLR, CAGS, Guilin 541004 - Peoples R China
[12] Univ Minnesota, Dept Earth Sci, Minneapolis, MN - USA
Total Affiliations: 12
Document type: Journal article
Source: QUATERNARY SCIENCE REVIEWS; v. 250, DEC 15 2020.
Web of Science Citations: 0
Abstract

Changes in insolation driven by precession and obliquity are considered the major driver of tropical precipitation on orbital time scales, and responsible for vegetation and physical landscape changes during the Late Holocene over tropical South America. Here we investigate the environmental changes in the karst region of Chapada do Apodi - Northeastern Brazil (NEB), using a multi-proxy approach including carbon (delta C-13), oxygen (delta O-18) and strontium (Sr-87/Sr-86) isotopic analyses on speleothems from different caves, carbonate bedrock, and clastic cave deposits. This approach reveals that the balance between soil formation and erosion and their alternating impact on vegetation and precipitation changes occurred in response to variations in the position and intensity of the Intertropical Convergence Zone (ITCZ) over the region. The high delta C-13 and delta O-18 and low Sr-87/Sr-86 values at 4,200 yrs BP indicate a massive episode of soil erosion, resulting in the exposure of carbonate bedrocks over a large area of the karst terrain. This event marks the beginning of the Meghalayan chronozone, characterized as the aridification of this region, decline in soil production, drying out of underground drainages, and increased dominance of dry-adapted flora species, characteristic of a more open vegetation (caatinga). We investigated if the Holocene climatic changes affected human occupation in the NEB and found that the overall demographic course is virtually identical to the well-established curve characterized by population deflation during Middle Holocene. (C) 2020 Elsevier Ltd. All rights reserved. (AU)

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 type: Scholarships in Brazil - Post-Doctorate
FAPESP's process: 19/15914-4 - Bracketing the Archaic Period in Central Brazil: building the chronology of Late Pleistocene megafauna and Middle Holocene rock art and human skeletons
Grantee:André Menezes Strauss
Support type: Regular Research Grants
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 type: Research Projects - Thematic Grants
FAPESP's process: 20/02737-4 - Teleconections between tropics and extra-tropics of South America
Grantee:Giselle Utida
Support type: Scholarships in Brazil - Post-Doctorate
FAPESP's process: 19/12981-2 - From funerary taphonomy to mortuary practices: a case study of the archaeological site Caixa d'Água (Buritizeiro - MG)
Grantee:Ana Claudia Albuquerque Borella
Support type: Scholarships in Brazil - Master
FAPESP's process: 17/16451-2 - Virtual anthropology and archaeogenomics of pre-colonial Brazil
Grantee:André Menezes Strauss
Support type: Research Grants - Young Investigators Grants