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

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posted on 29.03.2022, 02:24 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.


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.


Bibliography: pages 50-54 Thesis by publication.

Awarding Institution

Macquarie University

Degree Type

Thesis MRes


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

Department, Centre or School

Department of Biological Sciences

Year of Award


Principal Supervisor

Matthew Kosnik

Additional Supervisor 1

Giuseppe Cortese


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




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1 online resource (66 pages) illustrations

Former Identifiers

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