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Sea surface temperature changes in the western South Atlantic and precipitation variability in southeastern South America since the Last Glacial Maximum

Grant number: 10/09983-9
Support Opportunities:Regular Research Grants
Duration: September 01, 2010 - August 31, 2012
Field of knowledge:Physical Sciences and Mathematics - Geosciences
Principal Investigator:Cristiano Mazur Chiessi
Grantee:Cristiano Mazur Chiessi
Host Institution: Escola de Artes, Ciências e Humanidades (EACH). Universidade de São Paulo (USP). São Paulo , SP, Brazil


Southeastern South America (SESA) is the most densely populated and agriculturally productive region of the continent, greatly relying on South American summer monsoon (SASM) precipitation. A comprehensive understanding of the SASM activity on different time scales is thus a key issue. Here we propose to reconstruct sea surface and thermocline temperatures in the subtropical western South Atlantic since the Last Glacial Maximum in order to check if key periods of changes in precipitation over SESA (e.g., Heinrich Stadial 1, Bølling-Allerød, Younger Dryas, mid Holocene) were related to sea surface temperature changes in the subtropical western South Atlantic and to the latitudinal migration of the Brazil-Malvinas Confluence. Therefore, Mg/Ca and stable oxygen isotopes in selected species of planktonic foraminifera from three carefully selected marine sediment cores from the subtropical western South Atlantic will be analyzed. The sediment cores will have age models determined based on 14C AMS datings on monospecific foraminifera. Additionally, bulk sediment geochemistry will be analyzed on all cores in order to refine the variability in continental precipitation. Through this project we expect to significantly contribute to the debate of possible impacts of future climate change in SESA. (AU)

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Scientific publications (7)
(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)
RAZIK, SEBASTIAN; CHIESSI, CRISTIANO M.; ROMERO, OSCAR E.; VON DOBENECK, TILO. Interaction of the South American Monsoon System and the Southern Westerly Wind Belt during the last 14 kyr. PALAEOGEOGRAPHY PALAEOCLIMATOLOGY PALAEOECOLOGY, v. 374, p. 28-40, . (11/50394-0, 10/09983-9)
LANTZSCH, HENDRIK; HANEBUTH, TILL J. J.; CHIESSI, CRISTIANO M.; SCHWENK, TILMANN; VIOLANTE, ROBERTO A.. The high-supply, current-dominated continental margin of southeastern South America during the late Quaternary. Quaternary Research, v. 81, n. 2, p. 339-354, . (12/17517-3, 10/09983-9)
NAGAI, RENATA H.; CHIESSI, CRISTIANO M.; KUHNERT, HENNING; SOUSA, SILVIA H. M.; WAINER, ILANA E. K. C.; FIGUEIRA, RUBENS C. L.; MAHIQUES, MICHEL M.. South Brazilian Bight mid- to late Holocene hydrographic fluctuations. GEO-MARINE LETTERS, v. 40, n. 6, SI, p. 1045-1055, . (12/17517-3, 09/01594-6, 10/09983-9)
VOIGT, INES; CHIESSI, CRISTIANO M.; PRANGE, MATTHIAS; MULITZA, STEFAN; GROENEVELD, JEROEN; VARMA, VIDYA; HENRICH, RUEDIGER. Holocene shifts of the southern westerlies across the South Atlantic. PALEOCEANOGRAPHY, v. 30, n. 2, p. 39-51, . (12/17517-3, 10/09983-9)
BENDER, VERA B.; HANEBUTH, TILL J. J.; CHIESSI, CRISTIANO M.. Holocene shifts of the Subtropical Shelf Front off southeastern South America controlled by high and low latitude atmospheric forcings. PALEOCEANOGRAPHY, v. 28, n. 3, p. 481-490, . (11/50394-0, 12/17517-3, 10/09983-9)
PRADO, L. F.; WAINER, I.; CHIESSI, C. M.; LEDRU, M-P; TURCQ, B.. A mid-Holocene climate reconstruction for eastern South America. Climate of the Past, v. 9, n. 5, p. 2117-2133, . (12/17517-3, 10/09983-9, 11/06610-0)
CHIESSI, CRISTIANO M.; MULITZA, STEFAN; GROENEVELD, JEROEN; SILVA, JULIANA B.; CAMPOS, MARILIA C.; GURGEL, MARCIO H. C.. Variability of the Brazil Current during the late Holocene. PALAEOGEOGRAPHY PALAEOCLIMATOLOGY PALAEOECOLOGY, v. 415, n. SI, p. 28-36, . (12/17517-3, 10/09983-9)

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