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Revealing Rhythms of Ice Ages with Paleomagnetism

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Date(s) - 04/21/2022
6:00 pm - 7:30 pm

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Speaker: Brendan Reilly, PhD | Postdoctoral Researcher, Scripps Institution of Oceanography, University of California, San Diego; Co-Chief scientist of the Cascadia H.O.P.S. expedition

Presentation Summary: For over 50 years, the International Ocean Discovery Program (IODP) and its predecessor programs have recovered and archived long sedimentary records of Earth’s climate and geomagnetic histories for international scientific study. In 2019, IODP drilled Antarctic proximal sediments in the Scotia Sea’s “Iceberg Alley” during Expedition 382, recovering a more than 3-million-year sedimentary sequence from which we can learn about Antarctic Ice Sheet history and Southern Ocean dynamics. Sediment layers in these drill cores can be dated by identifying times when Earth’s magnetic field flipped polarity and comparing those events to the well-established geomagnetic polarity timescale. This chronology can then be used to study how Antarctic climate varied from the warm Pliocene about 3 million years ago through the ice age cycles of the Pleistocene.

Speaker Bio: Dr. Brendan Reilly is a postdoctoral researcher at the Scripps Institution of Oceanography in San Diego and Distinguished Lecturer for the Ocean Discovery Lecture Series. He has worked globally on the stratigraphy, paleomagnetism, and chronology of sediment cores from offshore Antarctica to Northern Greenland.  Brendan has participated in nine oceanographic expeditions, including the 2019 International Ocean Discovery Program Expedition 382, Iceberg Alley and Subantarctic Ice and Ocean Dynamics.

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