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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ftpangaea:oai:pangaea.de:doi:10.1594/PANGAEA.848133 2023-05-15T13:44:47+02:00 Age models, sedimentology and geochemistry from sediment cores in Drake Passage throughflow 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 MEDIAN LATITUDE: -49.763552 * MEDIAN LONGITUDE: -74.994434 * SOUTH-BOUND LATITUDE: -57.942800 * WEST-BOUND LONGITUDE: -123.100000 * NORTH-BOUND LATITUDE: 0.515000 * EAST-BOUND LONGITUDE: -42.467000 * DATE/TIME START: 1964-01-01T00:00:00 * DATE/TIME END: 2009-11-29T17:12:00 2015-07-15 application/zip, 8 datasets https://doi.pangaea.de/10.1594/PANGAEA.848133 https://doi.org/10.1594/PANGAEA.848133 en eng PANGAEA https://doi.pangaea.de/10.1594/PANGAEA.848133 https://doi.org/10.1594/PANGAEA.848133 CC-BY-3.0: Creative Commons Attribution 3.0 Unported Access constraints: unrestricted info:eu-repo/semantics/openAccess CC-BY 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, https://doi.org/10.1073/pnas.1509203112 AWI_Paleo Paleoenvironmental Reconstructions from Marine Sediments @ AWI Dataset 2015 ftpangaea https://doi.org/10.1594/PANGAEA.848133 https://doi.org/10.1073/pnas.1509203112 2023-01-20T07:33:29Z 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. Dataset Antarc* Antarctic Drake Passage Scotia Sea Sea ice Southern Ocean PANGAEA - Data Publisher for Earth & Environmental Science Antarctic Drake Passage Indian Pacific Scotia Sea Southern Ocean The Antarctic ENVELOPE(-123.100000,-42.467000,0.515000,-57.942800) |
institution |
Open Polar |
collection |
PANGAEA - Data Publisher for Earth & Environmental Science |
op_collection_id |
ftpangaea |
language |
English |
topic |
AWI_Paleo Paleoenvironmental Reconstructions from Marine Sediments @ AWI |
spellingShingle |
AWI_Paleo Paleoenvironmental Reconstructions from Marine Sediments @ AWI 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 Age models, sedimentology and geochemistry from sediment cores in Drake Passage throughflow |
topic_facet |
AWI_Paleo Paleoenvironmental Reconstructions from Marine Sediments @ AWI |
description |
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. |
format |
Dataset |
author |
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 |
author_facet |
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 |
author_sort |
Lamy, Frank |
title |
Age models, sedimentology and geochemistry from sediment cores in Drake Passage throughflow |
title_short |
Age models, sedimentology and geochemistry from sediment cores in Drake Passage throughflow |
title_full |
Age models, sedimentology and geochemistry from sediment cores in Drake Passage throughflow |
title_fullStr |
Age models, sedimentology and geochemistry from sediment cores in Drake Passage throughflow |
title_full_unstemmed |
Age models, sedimentology and geochemistry from sediment cores in Drake Passage throughflow |
title_sort |
age models, sedimentology and geochemistry from sediment cores in drake passage throughflow |
publisher |
PANGAEA |
publishDate |
2015 |
url |
https://doi.pangaea.de/10.1594/PANGAEA.848133 https://doi.org/10.1594/PANGAEA.848133 |
op_coverage |
MEDIAN LATITUDE: -49.763552 * MEDIAN LONGITUDE: -74.994434 * SOUTH-BOUND LATITUDE: -57.942800 * WEST-BOUND LONGITUDE: -123.100000 * NORTH-BOUND LATITUDE: 0.515000 * EAST-BOUND LONGITUDE: -42.467000 * DATE/TIME START: 1964-01-01T00:00:00 * DATE/TIME END: 2009-11-29T17:12:00 |
long_lat |
ENVELOPE(-123.100000,-42.467000,0.515000,-57.942800) |
geographic |
Antarctic Drake Passage Indian Pacific Scotia Sea Southern Ocean The Antarctic |
geographic_facet |
Antarctic Drake Passage Indian Pacific Scotia Sea Southern Ocean The Antarctic |
genre |
Antarc* Antarctic Drake Passage Scotia Sea Sea ice Southern Ocean |
genre_facet |
Antarc* Antarctic Drake Passage Scotia Sea Sea ice Southern Ocean |
op_source |
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, https://doi.org/10.1073/pnas.1509203112 |
op_relation |
https://doi.pangaea.de/10.1594/PANGAEA.848133 https://doi.org/10.1594/PANGAEA.848133 |
op_rights |
CC-BY-3.0: Creative Commons Attribution 3.0 Unported Access constraints: unrestricted info:eu-repo/semantics/openAccess |
op_rightsnorm |
CC-BY |
op_doi |
https://doi.org/10.1594/PANGAEA.848133 https://doi.org/10.1073/pnas.1509203112 |
_version_ |
1766206297912377344 |