The Pleistocene Evolution of the Antarctic Circumpolar Current: An Interglacial Perspective

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• Aidan Starr, Department of Geography
• Wednesday 18 October 2023, 17:30-19:00
• Harker 1, Department of Earth Sciences, Downing Street.

If you have a question about this talk, please contact Jinheum Park.

Building doors are card operated, so latecomers may not be able to access the venue.

The Antarctic Circumpolar Current (ACC) is today the world’s largest ocean current, dominating the transfer of heat, salt, and tracers around the Southern Ocean. The ACC also helps to draw carbon-rich deep waters to the surface, prying open the window between the ocean interior and the atmosphere. In this talk, I will present a new 1.9 Million Year record of deep flow speeds at the northern edge of the ACC . Using this record as a proxy for the vigour/latitudinal position of the Subantarctic Front jet, I show that the ACC responds sensitively to climate forcing through the Pleistocene. In particular, I will focus on anomalously intense reorganisations of the ACC which occur during “super-interglacial” intervals, punctuating the glacial-interglacial pattern and providing potential clues into how Southern Ocean circulation might respond to ongoing and future warming.

This talk is part of the Quaternary Discussion Group (QDG) series.

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