Reconstruction paleoclimate of Holocene across of isotopic rezones of oxygen and carbon in speleothems of Bahia and São Paulo.

• Grant number: 09/12887-4
• Support Opportunities: Scholarships in Brazil - Master
• Effective date (Start): March 01, 2010
• Effective date (End): February 29, 2012
• Field of knowledge: Physical Sciences and Mathematics - Geosciences - Geology
• Principal Investigator: Ivo Karmann
• Grantee: Valdir Felipe Novello
• Host Institution: Instituto de Geociências (IGC). Universidade de São Paulo (USP). São Paulo , SP, Brazil

Abstract

This research proposal aims to investigate the paleoclimate changes occurred in the last 5500 years during the Holocene in the states of Bahia and São Paulo. The study is based on high-resolution records of oxygen and carbon isotope ratios from speleothems, and also includes measurements of layer thickness and frequency within the same samples, which can be precisely dated by U/Th method.The research will focus on the study of high frequency climatic cycles interpreted from isotopic composition and microstratigraphic features of speleothems, with the use of time-series statistical analysis. The records from different cave site locations in Brazil will allow comparisons of the intensity and variability of the rainfall associated with South-American Summer monsoon System (SASM) in a regional scale. It might be possible to make link with climatic features originated in Atlantic or Pacific oceans such as El Niño-Southern Oscilation (ENSO), North Atlantic Oscilation (NAO) e Pacific Multidecadal Oscilation (PDO) with the rainfall that propagate from Amazon Basin to surrounding areas. Furthermore, we intend to discuss the effect of some highly discussed events such Medieval Climate Anomaly and Little Ice Age on the precipitation related to SASM in Brazil. This study already has available a significant number of U/Th ages that will make possible to constrain the chronology of the speleothem stable isotope records. The project is part of a scientific cooperation with researchers from United States and France and is supported by FAPESP (Grant Numbers 2006/06761-0 and 2006/0283402).

Academic Publications

(References retrieved automatically from State of São Paulo Research Institutions)

NOVELLO, Valdir Felipe. Paleoclimate reconstruction of recent Holocene based in stalagmites of central state of Bahia. 2012. Master's Dissertation - Universidade de São Paulo (USP). Instituto de Geociências (IG/BT) São Paulo.