Characterization of the sedimentary organic matter off the São Sebastião Island, on Southeastern Brazilian continental shelf using organic biomarkers

• Grant number: 15/21834-2
• Support Opportunities: Research Program on Global Climate Change - Regular Grants
• Start date: June 01, 2016
• End date: May 31, 2018
• Field of knowledge: Physical Sciences and Mathematics - Geosciences
• Principal Investigator: Márcia Caruso Bícego
• Grantee: Márcia Caruso Bícego
• Host Institution: Instituto Oceanográfico (IO). Universidade de São Paulo (USP). São Paulo , SP, Brazil
• City of the host institution: São Paulo
• Associated researchers: Michel Michaelovitch de Mahiques ; Rafael Andre Lourenço ; Rosalinda Carmela Montone ; Rubens Cesar Lopes Figueira ; Silvia Helena de Mello e Sousa

Abstract

The sedimentary organic matter provides a set of indicators that can be used to define the origin of the compounds, to obtain environmental reconstruction, and to understand the oceanographic and climatic processes. The Southeastern Brazilian Continental Shelf can be divided into two distinct zones of sedimentation and organic matter composition, due to the different hydrological processes that operate in this region. São Sebastião Island, northern coast of São Paulo, marks the boundary between these two areas, making São Sebastião area a convergence zone of sediment transport and a high sedimentation rate. Marine environments with a high sedimentation rate allow the achievement of high-resolution data. The combined use of different geochemical proxies, such as carbon stable isotopes and molecular organic markers, is an important tool in the study of the oceanographic and climatic changes in the past. Changes in the abundance and distribution of these compounds over the sediment cores can provide records of continental and marine paleoenvironments. This Project aims to use different geochemical proxies (carbon and nitrogen stable isotopes, n-alkanes, sterols and alkenones) to characterize the sedimentary organic matter in surface sediment samples and cores collected off São Sebastião Island in the Southeastern Brazilian Continental Shelf in order to evaluate the potential export of terrigenous material to the ocean and the implications of this contribution in the marine productivity. It also has the objective of associate of the characteristics of sedimentary organic matter with the water masses and carry out an assessment of temporal variability in the deposition of organic matter. (AU)

Scientific publications

(The scientific publications listed on this page originate from the Web of Science or SciELO databases. Their authors have cited FAPESP grant or fellowship project numbers awarded to Principal Investigators or Fellowship Recipients, whether or not they are among the authors. This information is collected automatically and retrieved directly from those bibliometric databases.)

DAUNER, ANA LUCIA LINDROTH; MOLLENHAUER, GESINE; HEFTER, JENS; BICEGO, MARCIA CARUSO; DE MAHIQUES, MICHEL MICHAELOVITCH; MARTINS, CESAR DE CASTRO. Late Pleistocene to Holocene variations in marine productivity and terrestrial material delivery to the western South Atlantic. FRONTIERS IN MARINE SCIENCE, v. 9, p. 15-pg., 2022-08-22. (10/06147-5, 15/21834-2)

DAUNER, ANA LUCIA L.; MOLLENHAUER, GESINE; BICEGO, MARCIA CARUSO; DE SOUZA, MIHAEL MACHADO; NAGAI, RENATA HANAE; LOPES FIGUEIRA, RUBENS CESAR; DE MAHIQUES, MICHEL MICHAELOVITCH; DE MELLO E SOUSA, SILVIA HELENA; MARTINS, CESAR C.. Multi-proxy reconstruction of sea surface and subsurface temperatures in the western South Atlantic over the last similar to 75 kyr. QUATERNARY SCIENCE REVIEWS, v. 215, p. 22-34, JUL 1 2019. (15/21834-2, 10/06147-5)

DAUNER, ANA LUCIA L.; MOLLENHAUER, GESINE; BICEGO, MARCIA C.; MARTINS, CESAR C.. Cluster analysis for time series based on organic geochemical proxies. Organic Geochemistry, v. 145, JUL 2020. (15/21834-2, 10/06147-5)