This paper is an excerpt from a thesis by James E. Arney, submitted in 2002, in partial fulfillment of the Master of Science degree at Florida State University. Some results have been presented in abstract by Arney and Wise (2001). We wish to thank all the participants of ODP Leg 183 for their contributions relevant to this paper. Special thanks go to Dr. Jason Curtis and the Stable Isotope Geochemistry Laboratory at the University of Florida under the direction of Professor David Hoddell. Without their help we would have been able to tell only half the story. We would like to thank the members of the Calcareous Nannofossil Laboratory at Florida State University for their helpful comments and assistance. Finally, we are indebted to Dr. James Pospichal, whose help has been invaluable to our understanding of the Southern Ocean. This research used samples and/or data provided by the Ocean Drilling Program (ODP). ODP is sponsored by the U.S. National Science Foundation (NSF) and participating countries under management of Joint Oceanographic Institutions (JOI), Inc. Funding for this research was provided by a USSAC grant to Dr. Sherwood W. Wise Jr.