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UID:https://www.otago.ac.nz/news/events/geology-seminar-series-talk-paleoenvironmental-reconstructions-of-the-pacific-sector
URL:https://www.otago.ac.nz/news/events/geology-seminar-series-talk-paleoenvironmental-reconstructions-of-the-pacific-sector
DTSTART;TZID=Pacific/Auckland:20250723T130000
DTEND;TZID=Pacific/Auckland:20250723T150000
SUMMARY:Geology seminar series talk: Paleoenvironmental reconstructions of the Pacific Sector, Southern Ocean
DESCRIPTION:Paleoenvironmental reconstructions of the Pacific Sector, Southern Ocean and evolution of the biological pump across the Mid-Pleistocene TransitionPresented by Meghan DuffyThroughout the Pleistocene (2.58 Ma – 11.7 ka), Earth’s climate was characterised by cycles between glacial and interglacial periods. The Mid-Pleistocene Transition (MPT) marked a major reorganisation of Earth’s climate when 41 kyr glacial cycles transitioned into higher-amplitude, 100 kyr cycles. The process behind this change remains unclear and represents a fundamental gap in our understanding of Earth’s climate. Marine productivity and global ocean circulation contribute to glacial-interglacial atmospheric CO2 variations, with the Southern Ocean having a disproportionate impact on a global scale. Therefore, the Southern Ocean biological pump, which facilitates ocean-atmosphere gas exchange via photosynthesis, has been suggested as an important mechanism driving Pleistocene climate. Here, I present novel paleo-productivity records from the Pacific Sector of the Southern Ocean at IODP 383 Site U1539. Site U1539, located at 56° 09.066’S, 115°08.038′, contains a continuous record of deposition over the last 1.4 Myr, spanning the MPT. The main objectives of this work are (i) to contribute new palaeoceanographic reconstructions from the understudied Pacific Sector of the Southern Ocean and (ii) to investigate the evolution of the Southern Ocean biological pump across the MPT. These records provide new insight to the role of the biological pump in regulating glacial-interglacial changes to atmospheric CO2. Zoom linkhttps://bit.ly/otagogeology 
LOCATION:Benson Common Room (Gn9), Geology Building, 360 Leith Street, Dunedin and online
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