This project will apply magnetic methods on carbonate sediments to perform detailed paleoceanographic reconstructions for the middle Eocene-Oligocene interval. High-resolution environmental magnetism, and other sedimentological and geochemical (XRD and XRF) records will be obtained from several archives in different part of the world (Italy, Turkey, Brazil, Atlantic Ocean and Antarctica). A robust magneto-bio-chemostratigraphic reference curve will be established and the major paleoceanographic and paleoclimatic events will be characterized from local to global scale. It is expected to obtain an enhanced reconstruction of the middle Eocene-Oligocene climatic history and new insights on the mechanisms that drove the global climate during the transition from greenhouse to icehouse conditions (33.7 Ma) and passing through important long-lasting warming events, such the middle Eocene climatic Optimum (MECO; ~40 Ma). This project proposes to obtain and examine high-quality, continuous stratigraphic records of magnetic properties from targeted time intervals to better understand (1) how magnetic properties can infer paleoclimate changes, (2) how physical and biological systems responded to elevated and varying levels of pCO2, and (3) how ocean circulation and carbon cycle behaved during the climatic transitions. An integrated data-model approach will offer new insight into the onset, early evolution, and subsequent behavior of oceans and ice sheets in Antarctica in response to underlying tectonic changes, landscape evolution, orbital forcing, and varying levels of pCO2. Particular attention will be given to the link between tectonic and oceanographic changes; the link between orbital forcing, C-cycle, and climate; characterization of the rapid "hyperthermals"; and calibration of the Milankovitch orbital signal between isotopes and magnetic properties in sedimentary archives of a period when pCO2 was very similar to the atmosphere of the next century.
News published in Agência FAPESP Newsletter about the scholarship: