Show simple item record Lamy, Frank Arz, Helge W. Kilian, Rolf Lange, Carina B. Lembke-Jene, Lester Wengler, Marc Kaiser, Jerôme Baeza-Urrea, Oscar Hall, Ian R. Harada, Naomi Tiedemann, Ralf
dc.contributor.editor Thiemens, Mark H.
dc.coverage.spatial Drake passage 2017-08-23T15:03:34Z 2017-08-23T15:03:34Z 2015-11-03
dc.identifier.citation PNAS November 3, 2015 . vol. 112 , no. 44 , 13497 es_ES
dc.identifier.issn 1091-6490
dc.description.abstract 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 and Antarctic temperature patterns. The glacial intervals of strong weakening of the ACC entering the DP imply an enhanced export of northern ACC surface and intermediate waters into the South Pacific Gyre and reduced Pacific–Atlantic exchange through the DP (“cold water route”). We conclude that changes in DP throughflow play a critical role for the global meridional overturning circulation and interbasin exchange in the Southern Ocean, most likely regulated by variations in the westerly wind field and changes in Antarctic sea ice extent. es_ES
dc.language.iso en es_ES
dc.publisher National Academy of Sciences es_ES
dc.relation.ispartof Proceedings of the National Academy of Sciences es_ES
dc.rights Freely available online through the PNAS open access option, 6 months publication after. es_ES
dc.subject Ciencia es_ES
dc.subject Paleoceanography es_ES
dc.subject Glacial–interglacial changes es_ES
dc.subject Sedimentology es_ES
dc.subject Antarctic Circumpolar Current es_ES
dc.title Glacial reduction and millennial-scale variations in Drake Passage throughflow es_ES
dc.type Artículo es_ES

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