Sortable silt, alkenone-SST and ice rafted debris data from sediment core JR244-GC528 (southwest Atlantic)
The oceanic gateways of the Drake Passage and the Agulhas Current are critical locations for the inflow of intermediate-depth water masses to the Atlantic, which contribute to the shallow return flow that balances the export of deep water from the North Atlantic. The thermohaline properties of north...
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ftpangaea:oai:pangaea.de:doi:10.1594/PANGAEA.878267 2023-05-15T13:44:47+02:00 Sortable silt, alkenone-SST and ice rafted debris data from sediment core JR244-GC528 (southwest Atlantic) Roberts, Jenny McCave, I Nick McClymont, Erin L Kender, Sev Hillenbrand, Claus-Dieter Matano, Ricardo Hodell, David A Peck, Victoria L LATITUDE: -53.013000 * LONGITUDE: -58.040500 * DATE/TIME START: 2011-01-29T00:00:00 * DATE/TIME END: 2011-01-29T00:00:00 2017-07-26 application/zip, 3 datasets https://doi.pangaea.de/10.1594/PANGAEA.878267 https://doi.org/10.1594/PANGAEA.878267 en eng PANGAEA https://doi.pangaea.de/10.1594/PANGAEA.878267 https://doi.org/10.1594/PANGAEA.878267 CC-BY-3.0: Creative Commons Attribution 3.0 Unported Access constraints: unrestricted info:eu-repo/semantics/openAccess CC-BY Supplement to: Roberts, J; McCave, I Nick; McClymont, Erin L; Kender, Sev; Hillenbrand, Claus-Dieter; Matano, Ricardo; Hodell, David A; Peck, Victoria L (2017): Deglacial changes in flow and frontal structure through the Drake Passage. Earth and Planetary Science Letters, 474, 397-408, https://doi.org/10.1016/j.epsl.2017.07.004 Dataset 2017 ftpangaea https://doi.org/10.1594/PANGAEA.878267 https://doi.org/10.1016/j.epsl.2017.07.004 2023-01-20T07:33:59Z The oceanic gateways of the Drake Passage and the Agulhas Current are critical locations for the inflow of intermediate-depth water masses to the Atlantic, which contribute to the shallow return flow that balances the export of deep water from the North Atlantic. The thermohaline properties of northward flowing intermediate water are ultimately determined by the inflow of water through oceanic gateways. Here, we focus on the less well-studied "Cold Water Route" through the Drake Passage. We present millennially-resolved bottom current flow speed and sea surface temperature records downstream of the Drake Passage spanning the last 25,000 yr. We find that prior to 15 ka, bottom current flow speeds at sites in the Drake Passage region were dissimilar and there was a marked anti-phasing between sea surface temperatures at sites upstream and downstream of the Drake Passage. After 14 ka, we observe a remarkable convergence of flow speeds coupled with a sea surface temperature phase change at sites upstream and downstream of Drake Passage. We interpret this convergence as evidence for a significant southward shift of the sub-Antarctic Front from a position north of Drake Passage. This southward shift increased the through-flow of water from the Pacific, likely reducing the density of Atlantic Intermediate Water. The timing of the southward shift in the sub-Antarctic Front is synchronous with a major re-invigoration of Atlantic Meridional Overturning Circulation, with which, we argue, it may be linked. Dataset Antarc* Antarctic Drake Passage North Atlantic PANGAEA - Data Publisher for Earth & Environmental Science Antarctic Drake Passage Pacific ENVELOPE(-58.040500,-58.040500,-53.013000,-53.013000) |
institution |
Open Polar |
collection |
PANGAEA - Data Publisher for Earth & Environmental Science |
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ftpangaea |
language |
English |
description |
The oceanic gateways of the Drake Passage and the Agulhas Current are critical locations for the inflow of intermediate-depth water masses to the Atlantic, which contribute to the shallow return flow that balances the export of deep water from the North Atlantic. The thermohaline properties of northward flowing intermediate water are ultimately determined by the inflow of water through oceanic gateways. Here, we focus on the less well-studied "Cold Water Route" through the Drake Passage. We present millennially-resolved bottom current flow speed and sea surface temperature records downstream of the Drake Passage spanning the last 25,000 yr. We find that prior to 15 ka, bottom current flow speeds at sites in the Drake Passage region were dissimilar and there was a marked anti-phasing between sea surface temperatures at sites upstream and downstream of the Drake Passage. After 14 ka, we observe a remarkable convergence of flow speeds coupled with a sea surface temperature phase change at sites upstream and downstream of Drake Passage. We interpret this convergence as evidence for a significant southward shift of the sub-Antarctic Front from a position north of Drake Passage. This southward shift increased the through-flow of water from the Pacific, likely reducing the density of Atlantic Intermediate Water. The timing of the southward shift in the sub-Antarctic Front is synchronous with a major re-invigoration of Atlantic Meridional Overturning Circulation, with which, we argue, it may be linked. |
format |
Dataset |
author |
Roberts, Jenny McCave, I Nick McClymont, Erin L Kender, Sev Hillenbrand, Claus-Dieter Matano, Ricardo Hodell, David A Peck, Victoria L |
spellingShingle |
Roberts, Jenny McCave, I Nick McClymont, Erin L Kender, Sev Hillenbrand, Claus-Dieter Matano, Ricardo Hodell, David A Peck, Victoria L Sortable silt, alkenone-SST and ice rafted debris data from sediment core JR244-GC528 (southwest Atlantic) |
author_facet |
Roberts, Jenny McCave, I Nick McClymont, Erin L Kender, Sev Hillenbrand, Claus-Dieter Matano, Ricardo Hodell, David A Peck, Victoria L |
author_sort |
Roberts, Jenny |
title |
Sortable silt, alkenone-SST and ice rafted debris data from sediment core JR244-GC528 (southwest Atlantic) |
title_short |
Sortable silt, alkenone-SST and ice rafted debris data from sediment core JR244-GC528 (southwest Atlantic) |
title_full |
Sortable silt, alkenone-SST and ice rafted debris data from sediment core JR244-GC528 (southwest Atlantic) |
title_fullStr |
Sortable silt, alkenone-SST and ice rafted debris data from sediment core JR244-GC528 (southwest Atlantic) |
title_full_unstemmed |
Sortable silt, alkenone-SST and ice rafted debris data from sediment core JR244-GC528 (southwest Atlantic) |
title_sort |
sortable silt, alkenone-sst and ice rafted debris data from sediment core jr244-gc528 (southwest atlantic) |
publisher |
PANGAEA |
publishDate |
2017 |
url |
https://doi.pangaea.de/10.1594/PANGAEA.878267 https://doi.org/10.1594/PANGAEA.878267 |
op_coverage |
LATITUDE: -53.013000 * LONGITUDE: -58.040500 * DATE/TIME START: 2011-01-29T00:00:00 * DATE/TIME END: 2011-01-29T00:00:00 |
long_lat |
ENVELOPE(-58.040500,-58.040500,-53.013000,-53.013000) |
geographic |
Antarctic Drake Passage Pacific |
geographic_facet |
Antarctic Drake Passage Pacific |
genre |
Antarc* Antarctic Drake Passage North Atlantic |
genre_facet |
Antarc* Antarctic Drake Passage North Atlantic |
op_source |
Supplement to: Roberts, J; McCave, I Nick; McClymont, Erin L; Kender, Sev; Hillenbrand, Claus-Dieter; Matano, Ricardo; Hodell, David A; Peck, Victoria L (2017): Deglacial changes in flow and frontal structure through the Drake Passage. Earth and Planetary Science Letters, 474, 397-408, https://doi.org/10.1016/j.epsl.2017.07.004 |
op_relation |
https://doi.pangaea.de/10.1594/PANGAEA.878267 https://doi.org/10.1594/PANGAEA.878267 |
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.878267 https://doi.org/10.1016/j.epsl.2017.07.004 |
_version_ |
1766206580873756672 |