Medieval Climate Variability in the eastern Amazon-Cerrado regions and its archeological implications

Autor(es):Mostrar menos -

Azevedo, Vitor ^[1] ; Strikis, Nicolas M. ^[1] ; Santos, Rudney A. ^[2] ; de Souza, Jonas Gregorio ^[3] ; Ampuero, Angela ^[1] ; Cruz, Francisco W. ^[2] ; de Oliveira, Paulo ^[2] ; Iriarte, Jose ^[3] ; Stumpf, Cintia F. ^[4] ; Vuille, Mathias ^[5] ; Mendes, Vinicius R. ^[6] ; Cheng, Hai ^{[7, 8]} ; Edwards, R. Lawrence ^[8]

Afiliação do(s) autor(es)

^[1] Fluminense Fed Univ, Geochem Dept, BR-24020141 Niteroi, RJ - Brazil

^[2] Univ Sao Paulo, Geosci Inst, BR-05508080 Sao Paulo - Brazil

^[3] Univ Exeter, Dept Archeol, Exeter, Devon - England

^[4] Univ Brasilia, Geociences Inst, BR-70910900 Brasilia, DF - Brazil

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

^[6] Univ Fed Sao Paulo, Marine Sci Dept, BR-11050020 Santos, SP - Brazil

^[7] Xi An Jiao Tong Univ, Inst Global Environm Change, Xian - Peoples R China

^[8] Univ Minnesota, Dept Earth & Environm Sci, Minneapolis, MN - USA

• Tipo de documento: Artigo Científico
• Fonte: SCIENTIFIC REPORTS; v. 9, DEC 30 2019.
• Citações Web of Science: 0

Resumo

The South American Monsoon System is responsible for the majority of precipitation in the continent, especially over the Amazon and the tropical savannah, known as `Cerrado'. Compared to the extensively studied subtropical and temperate regions the effect of the Medieval Climate Anomaly (MCA) on the precipitation over the tropics is still poorly understood. Here, we present a multiproxy paleoprecipitation reconstruction showing a consistent change in the hydrologic regime during the MCA in the eastern Amazon and `Cerrado', characterized by a substantial transition from humid to drier conditions during the Early (925-1150 C.E.) to Late-MCA (1150-1350 C.E.). We compare the timing of major changes in the monsoon precipitation with the expansion and abandonment of settlements reported in the archeological record. Our results show that important cultural successions in the pre-Columbian Central Amazon, the transition from Paredao to Guarita phase, are in agreement with major changes in the hydrologic regime. Phases of expansion and, subsequent abandonment, of large settlements from Paredao during the Early to Late-MCA are coherent with a reduction in water supply. In this context we argue that the sustained drier conditions during the latter period may have triggered territorial disputes with Guarita leading to the Paredao demise. (AU)

• Processo FAPESP: 16/02656-9 - A resposta da dinâmica sedimentar dos rios Xingu e Tapajós às mudanças climáticas e barragens de usinas hidrelétricas: riscos para conservação da biodiversidade e produção de energia na Amazônia
• Beneficiário: André Oliveira Sawakuchi
• Linha de fomento: Auxílio à Pesquisa - Programa de Pesquisa sobre Mudanças Climáticas Globais - Regular
• Processo FAPESP: 17/50085-3 - PIRE: educação e pesquisa em clima das Américas usando os exemplos de anéis de árvores e espeleotemas (PIRE-CREATE)
• Beneficiário: Francisco William da Cruz Junior
• Linha de fomento: Auxílio à Pesquisa - Temático