Glacial reduction and millennial-scale variations in Drake Passage throughflow

The Drake Passage (DP) represents the most important oceanic gateway along the pathway of the world’s largest current: the Antarctic Circumpolar Current (ACC). Resolving changes in the flow of circumpolar water masses through the DP is crucial for advancing our understanding of the Southern Ocean’s...

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Bibliographic Details
Published in:Proceedings of the National Academy of Sciences
Main Authors: Lamy, Frank, Arz, Helge W., Kilian, Rolf, Lange, Carina B., Lembke-Jene, Lester, Wengler, Marc, Kaiser, Jérôme, Baeza-Urreac, Oscar, Hall, Ian Robert, Harada, Naomi, Tiedemann, Ralf
Format: Article in Journal/Newspaper
Language:English
Published: National Academy of Sciences 2015
Subjects:
Antarctic
Drake Passage
Pacific
The Antarctic
Antarc*
Online Access:https://orca.cardiff.ac.uk/id/eprint/77063/
https://doi.org/10.1073/pnas.1509203112
https://orca.cardiff.ac.uk/id/eprint/77063/1/Lamy%20et%20al.%202015%20PNAS%20early%20edition%5B2%5D.pdf
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Summary:The Drake Passage (DP) represents the most important oceanic gateway along the pathway of the world’s largest current: the Antarctic Circumpolar Current (ACC). Resolving changes in the flow of circumpolar water masses through the DP is crucial for advancing our understanding of the Southern Ocean’s role in affecting ocean and climate change on a global scale. We reconstruct current intensity from marine sediment records around the southern tip of South America with unprecedented millennial-scale resolution covering the past ∼65,000 y. For the last glacial period, we infer intervals of strong weakening of the ACC entering the DP, implying an enhanced export of northern ACC surface and intermediate waters into the South Pacific Gyre and reduced Pacific–Atlantic exchange through the cold water route.

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