340,000-Year Centennial-Scale Marine Record of Southern Hemisphere Climatic Oscillation

Author:

Pahnke Katharina1234,Zahn Rainer1234,Elderfield Henry1234,Schulz Michael1234

Affiliation:

1. School of Earth, Ocean and Planetary Sciences, Cardiff University, Park Place, Cardiff CF10 3YE, UK.

2. Institució Catalana de Recerca i Estudis Avançats (ICREA) and Facultat de Geologia, Grup de Recerca Consolidat (GRC) en Geociències Marines, Department d' Estratigafia, Paleontologia i Geosciències Marines, Universitat de Barcelona, Campus de Pedralbes, 08028 Barcelona, Spain.

3. Department of Earth Sciences, University of Cambridge, Downing Street, Cambridge CB2 3EQ, UK.

4. Department of Geosciences and DFG Research Center “Ocean Margins,” University of Bremen, 28334 Bremen, Germany.

Abstract

In order to investigate rapid climatic changes at mid-southern latitudes, we have developed centennial-scale paleoceanographic records from the southwest Pacific that enable detailed comparison with Antarctic ice core records. These records suggest close coupling of mid-southern latitudes with Antarctic climate during deglacial and interglacial periods. Glacial sections display higher variability than is seen in Antarctic ice cores, which implies climatic decoupling between mid- and high southern latitudes due to enhanced circum-Antarctic circulation. Structural and temporal similarity with the Greenland ice core record is evident in glacial sections and suggests a degree of interhemispheric synchroneity not predicted from bipolar ice core correlations.

Publisher

American Association for the Advancement of Science (AAAS)

Subject

Multidisciplinary

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