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Radiolarian-based Quaternary palaeoclimate reconstructions of the Sabrina Coast, East Antarctica

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thesis
posted on 29.03.2022, 02:24 authored by Kelly-Anne Lawler
Understanding past Southern Ocean climate is important for predicting future climate scenarios. Siliceous microfossil tests preserved in seafloor sediment can be used as proxies to investigate and reconstruct the timing of glacial/interglacial cycles and to estimate past sea-surface temperature. Well-preserved radiolarian tests were sampled from two 2.5 m sediment cores obtained from the continental slope of the Sabrina Coast region, East Antarctica, during RV Investigator voyage IN2017-V01. The radiolarian assemblages were used to verify that the microfossil record can be used as a proxy to reconstruct palaeoclimatic parameters in this region and to estimate summer sea-surface palaeotemperatures using the Imbrie-Kipp transfer function. This research demonstrates that the timing of glacial/interglacial cycles can be identified in Sabrina Coast sediment using the fossil radiolarian record. The Holocene and previous glacial period (i.e. Marine isotope stages 1 and 2) are clearly differentiated with Holocene oceanographic conditions being conducive to biosiliceous sedimentation, whilst conditions during glacial periods are not. Holocene summer sea-surface palaeotemperature estimates range between -3.26 °C and 3.26 °C. Future research will include a Ph.D. project using radiolarians from longer Sabrina Coast cores for palaeoclimate reconstruction over multiple glacial/interglacial cycles.

History

Table of Contents

1. Introduction -- 2. General methods -- 3. Radiolarians as indicators of Quaternary glacial/interglacial cycles -- 4. Radiolarian-based palaeotemperature estimates for the current interglacial -- 5. Conclusion -- References -- Supplementary material.

Notes

Bibliography: pages 50-54 Thesis by publication.

Awarding Institution

Macquarie University

Degree Type

Thesis MRes

Degree

MRes, Macquarie University, Faculty of Science and Engineering, Department of Biological Sciences

Department, Centre or School

Department of Biological Sciences

Year of Award

2018

Principal Supervisor

Matthew Kosnik

Additional Supervisor 1

Giuseppe Cortese

Rights

Copyright Kelly-Anne Lawler 2018. Copyright disclaimer: http://mq.edu.au/library/copyright

Language

English

Jurisdiction

Yellow Sea

Extent

1 online resource (66 pages) illustrations

Former Identifiers

mq:70892 http://hdl.handle.net/1959.14/1268754