Ocean circulation and climate variability in the western South Atlantic and eastern South America during the last deglaciation [Elektronische Ressource] / vorgelegt von Cristiano Mazur Chiessi

Ocean circulation and climate variability in the western South Atlantic and eastern South America during the last deglaciation Dissertation zur Erlangung des Doktorgrades am Fachbereich Geowissenschaften der Universität Bremen vorgelegt von Cristiano Mazur Chiessi Bremen, April 2008 Tag des Kolloquiums: 25. Juli 2008 Gutachter: Prof. Dr. Gerold Wefer Prof. Dr. Dierk Hebbeln Prüfer:Prof. Dr. Katrin Huhn Dr. André Paul Table of contents Abstract iii Chapter 1 Introduction 1 1.1 Motivation 1 1.2 Objectives 4 1.3 Outline 5 Chapter 2 Environmental setting 7 2.1 Oceanic circulation 7 2.2 Atmospheric circulation 10 2.3 Geology 12 Chapter 3 Methods 15 3.1 Mg/Ca paleothermometry 15 3.2 Stable isotopes 16 3.3 X-ray fluorescence core scanner 20 3.4 Radiocarbon dating 21 3.5 The University of Victoria Earth System Climate Model 23 Chapter 4 Signature of the Brazil-Malvinas Confluence (Argentine Basin) in the isotopic composition of planktonic foraminifera from surface sediments 25 C. M. Chiessi, S. Ulrich, S. Mulitza, J. Pätzold, G. Wefer 4.1 Abstract 25 4.2 Introduction 26 4.3 Regional setting 27 4.4 Materials and methods 31 4.5 Results 35 4.6 Discussion 38 4.