Age models, sedimentology and geochemistry from sediment cores in Drake Passage throughflow ...

The Drake Passage (DP) is the major geographic constriction for the Antarctic Circumpolar Current (ACC) and exerts a strong control on the exchange of physical, chemical, and biological properties between the Atlantic, Pacific, and Indian Ocean basins. Resolving changes in the flow of circumpolar wa...

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Bibliographic Details
Main Authors: Lamy, Frank, Arz, Helge Wolfgang, Kilian, Rolf, Lange, Carina Beatriz, Lembke-Jene, Lester, Wengler, Marc, Kaiser, Jérôme, Urrea, Oscar Baeza, Hall, Ian R, Harada, Naomi, Tiedemann, Ralf
Format: Article in Journal/Newspaper
Language:English
Published: PANGAEA 2015
Subjects:
Paleoenvironmental Reconstructions from Marine Sediments @ AWI AWI_Paleo
Antarc*
Antarctic
Drake Passage
Scotia Sea
Southern Ocean
Online Access:https://dx.doi.org/10.1594/pangaea.848133
https://doi.pangaea.de/10.1594/PANGAEA.848133
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Summary:The Drake Passage (DP) is the major geographic constriction for the Antarctic Circumpolar Current (ACC) and exerts a strong control on the exchange of physical, chemical, and biological properties between the Atlantic, Pacific, and Indian Ocean basins. Resolving changes in the flow of circumpolar water masses through this gateway is, therefore, crucial for advancing our understanding of the Southern Ocean's role in global ocean and climate variability. Here, we reconstruct changes in DP throughflow dynamics over the past 65,000 y based on grain size and geochemical properties of sediment records from the southernmost continental margin of South America. Combined with published sediment records from the Scotia Sea, we argue for a considerable total reduction of DP transport and reveal an up to ~40% decrease in flow speed along the northernmost ACC pathway entering the DP during glacial times. Superimposed on this long-term decrease are high-amplitude, millennial-scale variations, which parallel Southern Ocean ... : Supplement to: Lamy, Frank; Arz, Helge Wolfgang; Kilian, Rolf; Lange, Carina Beatriz; Lembke-Jene, Lester; Wengler, Marc; Kaiser, Jérôme; Urrea, Oscar Baeza; Hall, Ian R; Harada, Naomi; Tiedemann, Ralf (2015): Glacial reduction and millennial-scale variations inDrake Passage throughflow. Proceedings of the National Academy of Sciences of the United States of America, 112(44), 13496-13501 ...

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