Detailseite
Projekt
Meeresspiegel und kurzfristige Klimaschwankungen des frühen Pleistozäns aus dem Blickwinkel des tropischen Pazifiks und des Nordatlantiks
Antragsteller
Professor Dr. Oliver Friedrich; Professor Dr. Jörg Pross
Fachliche Zuordnung
Paläontologie
Förderung
Förderung von 2012 bis 2017
Projektkennung
Deutsche Forschungsgemeinschaft (DFG) - Projektnummer 224933569
This project aims at deciphering the rate of sea-level variability and its effect on millennial-scale climate fluctuations during the intensification of northern hemisphere glaciation (iNHG). Another important aspect is the detailed comparison of early Pleistocene and late Pleistocene glacial intervals to identify common and/or different features in sea-level dynamics and their internal anatomy; this will help to identify the mechanisms underlying the dynamics of early Pleistocene ice sheets during iNHG. We propose to achieve these goals through studying material from the North Atlantic Ocean (IODP Site U1313) for the time interval from 2.75 to 2.4 Ma (marine isotope stages (MIS) G6 to 96). A similar dataset for this time interval has been produced from the tropical Pacific Ocean (ODP Site 849) within the framework of the first funding phase of this proposal. These data provide sea-level reconstructions comparable to model-derived estimates but are characterized by significant differences to available North Atlantic data. Therefore, we propose to apply a combined geochemical approach using oxygen isotopes and Mg/Ca of the benthic foraminiferal species Oridorsalis umbonatus to answer the following main research questions: (1) to what extent can the sea-level estimates obtained from Site 849 be validated using North Atlantic Site U1313?, (2) did an ice-volume/sea-level threshold as a trigger for large-amplitude millennial-scale climate fluctuations exist during the early Pleistocene?, and (3) to what extent are early Pleistocene glacials comparable to those from the late Pleistocene?
DFG-Verfahren
Infrastruktur-Schwerpunktprogramme
