A mid-Holocene climate reconstruction for eastern South America

Autor(es)

Prado, L. F. ^[1] ; Wainer, I. ^[1] ; Chiessi, C. M. ^[2] ; Ledru, M-P ^[3] ; Turcq, B. ^[4]

Afiliação do(s) autor(es)

^[1] Univ Sao Paulo, Inst Oceanog, Sao Paulo - Brazil

^[2] Univ Sao Paulo, Escola Artes Ciencias & Humanidades, Sao Paulo - Brazil

^[3] UM2, CNRS, IRD, Inst Sci Evolut, UMR 226, Montpellier - France

^[4] IRD, UMR 7159, Lab Oceanog & Climat Experimentat & Approches Num, Bondy - France

• Tipo de documento: Artigo Científico
• Fonte: Climate of the Past; v. 9, n. 5, p. 2117-2133, 2013.
• Citações Web of Science: 33

Resumo

The mid-Holocene (6000 calibrated years before present) is a key period in palaeoclimatology because incoming summer insolation was lower than during the late Holocene in the Southern Hemisphere, whereas the opposite happened in the Northern Hemisphere. However, the effects of the decreased austral summer insolation over South American climate have been poorly discussed by palaeodata syntheses. In addition, only a few of the regional studies have characterised the mid-Holocene climate in South America through a multiproxy approach. Here, we present a multiproxy compilation of mid-Holocene palaeoclimate data for eastern South America. We compiled 120 palaeoclimatological datasets, which were published in 84 different papers. The palaeodata analysed here suggest a water deficit scenario in the majority of eastern South America during the mid-Holocene if compared to the late Holocene, with the exception of northeastern Brazil. Low mid-Holocene austral summer insolation caused a reduced land-sea temperature contrast and hence a weakened South American monsoon system circulation. This scenario is represented by a decrease in precipitation over the South Atlantic Convergence Zone area, saltier conditions along the South American continental margin, and lower lake levels. (AU)

• Processo FAPESP: 12/17517-3 - Resposta da porção oeste do Oceano Atlântico às mudanças na circulação meridional do Atlântico: variabilidade milenar a sazonal
• Beneficiário: Cristiano Mazur Chiessi
• Modalidade de apoio: Auxílio à Pesquisa - Programa de Pesquisa sobre Mudanças Climáticas Globais - Jovens Pesquisadores
• Processo FAPESP: 10/09983-9 - Mudanças na temperatura da superfície do mar no oeste do Atlântico Sul e variabilidade na precipitação no sudeste da América do Sul desde o Último Máximo Glacial
• Beneficiário: Cristiano Mazur Chiessi
• Modalidade de apoio: Auxílio à Pesquisa - Regular
• Processo FAPESP: 11/06610-0 - A interação oceano-atmosfera no Atlântico Sul e o paleociclo hidrológico na porção leste da América do Sul subtropical durante o Holoceno
• Beneficiário: Luciana Figueiredo Prado
• Modalidade de apoio: Bolsas no Brasil - Doutorado