Centennial- to millennial-scale ice-ocean interactions in the subpolar northeast Atlantic 18-41 kyr ago
In order to monitor the evolution of the British-Irish Ice Sheet (BIIS) and its influence in surface ocean structure during marine isotopic stages (MIS) 2 and 3, we have analyzed the sediments recovered in core MD04-2829CQ (Rosemary Bank, north Rockall Trough, northeast Atlantic) dated between ∼41...
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Language: | English |
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ftuabarcelonapb:oai:ddd.uab.cat:25426 2024-09-15T18:03:30+00:00 Centennial- to millennial-scale ice-ocean interactions in the subpolar northeast Atlantic 18-41 kyr ago Hall, Ian R. Colmenero-Hidalgo, E. Zahn, Rainer Peck, V. L. Hemming, S. R. 2011 application/pdf https://ddd.uab.cat/record/25426 eng eng Ministerio de EconomÃa y Competitividad GGL2007/61579/CLI Paleoceanography Vol. 26, Issue 2 (June 2011), p. PA2224 https://ddd.uab.cat/record/25426 urn:10.1029/2010PA002084 urn:oai:ddd.uab.cat:25426 urn:recercauab:ARE-69108 urn:scopus_id:79960003586 urn:wos_id:000292396500002 urn:oai:egreta.uab.cat:publications/729627d8-1ca5-4c48-9db7-9fd4e4f28e22 open access Tots els drets reservats. https://rightsstatements.org/vocab/InC/1.0/ British-Irish Ice Sheet Heinrich events Dansgaard-Oeschger events Ice-rafted debris 40Ar/39Ar ages Planktonic foraminifera Article 2011 ftuabarcelonapb 2024-09-04T06:59:19Z In order to monitor the evolution of the British-Irish Ice Sheet (BIIS) and its influence in surface ocean structure during marine isotopic stages (MIS) 2 and 3, we have analyzed the sediments recovered in core MD04-2829CQ (Rosemary Bank, north Rockall Trough, northeast Atlantic) dated between ∼41 and ∼18 ka B.P. Ice-rafted debris flux and composition, 40Ar/39Ar ages of individual hornblende grains, multispecies planktonic stable isotope records, planktonic foraminifera assemblage data and faunal-based sea surface temperatures (SSTs) demonstrate a close interaction between BIIS dynamics and surface ocean structure and water properties in this region. The core location lies beneath the North Atlantic Current (NAC) and is ideal for monitoring the shifts in the position of its associated oceanic fronts, as recorded by faunal changes. These data reveal a succession of BIIS-sourced iceberg calving events related to low SST, usually synchronous with dramatic changes in the composition of the planktonic foraminifera assemblage and with variations in the stable isotope records of the taxa Neogloboquadrina pachyderma (sinistral coiling) and Globigerina bulloides. The pacing of the calving events, from typically Dansgaard-Oeschger millennial timescales during late MIS 3 to multicentennial cyclicity from ∼28 ka B.P., represents the build-up of the BIIS and its growing instability toward Heinrich Event (HE) 2 and the Last Glacial Maximum. Our data confirm the strong coupling between BIIS instabilities and the temperature and salinity of surface waters in the adjacent northeast Atlantic and demonstrate the BIIS's ability to modify the NAC on its flow toward the Nordic Seas. In contrast, subsurface water masses were less affected except during the Greenland stadials that contain HEs, when most intense water column reorganizations occurred simultaneously with the deposition of cream-colored carbonate sourced from the Laurentide Ice Sheet. Article in Journal/Newspaper Dansgaard-Oeschger events Greenland Ice Sheet Neogloboquadrina pachyderma Nordic Seas north atlantic current North Atlantic Northeast Atlantic Planktonic foraminifera Universitat Autònoma de Barcelona: Dipòsit Digital de Documents de la UAB Paleoceanography 26 2 n/a n/a |
institution |
Open Polar |
collection |
Universitat Autònoma de Barcelona: Dipòsit Digital de Documents de la UAB |
op_collection_id |
ftuabarcelonapb |
language |
English |
topic |
British-Irish Ice Sheet Heinrich events Dansgaard-Oeschger events Ice-rafted debris 40Ar/39Ar ages Planktonic foraminifera |
spellingShingle |
British-Irish Ice Sheet Heinrich events Dansgaard-Oeschger events Ice-rafted debris 40Ar/39Ar ages Planktonic foraminifera Hall, Ian R. Colmenero-Hidalgo, E. Zahn, Rainer Peck, V. L. Hemming, S. R. Centennial- to millennial-scale ice-ocean interactions in the subpolar northeast Atlantic 18-41 kyr ago |
topic_facet |
British-Irish Ice Sheet Heinrich events Dansgaard-Oeschger events Ice-rafted debris 40Ar/39Ar ages Planktonic foraminifera |
description |
In order to monitor the evolution of the British-Irish Ice Sheet (BIIS) and its influence in surface ocean structure during marine isotopic stages (MIS) 2 and 3, we have analyzed the sediments recovered in core MD04-2829CQ (Rosemary Bank, north Rockall Trough, northeast Atlantic) dated between ∼41 and ∼18 ka B.P. Ice-rafted debris flux and composition, 40Ar/39Ar ages of individual hornblende grains, multispecies planktonic stable isotope records, planktonic foraminifera assemblage data and faunal-based sea surface temperatures (SSTs) demonstrate a close interaction between BIIS dynamics and surface ocean structure and water properties in this region. The core location lies beneath the North Atlantic Current (NAC) and is ideal for monitoring the shifts in the position of its associated oceanic fronts, as recorded by faunal changes. These data reveal a succession of BIIS-sourced iceberg calving events related to low SST, usually synchronous with dramatic changes in the composition of the planktonic foraminifera assemblage and with variations in the stable isotope records of the taxa Neogloboquadrina pachyderma (sinistral coiling) and Globigerina bulloides. The pacing of the calving events, from typically Dansgaard-Oeschger millennial timescales during late MIS 3 to multicentennial cyclicity from ∼28 ka B.P., represents the build-up of the BIIS and its growing instability toward Heinrich Event (HE) 2 and the Last Glacial Maximum. Our data confirm the strong coupling between BIIS instabilities and the temperature and salinity of surface waters in the adjacent northeast Atlantic and demonstrate the BIIS's ability to modify the NAC on its flow toward the Nordic Seas. In contrast, subsurface water masses were less affected except during the Greenland stadials that contain HEs, when most intense water column reorganizations occurred simultaneously with the deposition of cream-colored carbonate sourced from the Laurentide Ice Sheet. |
format |
Article in Journal/Newspaper |
author |
Hall, Ian R. Colmenero-Hidalgo, E. Zahn, Rainer Peck, V. L. Hemming, S. R. |
author_facet |
Hall, Ian R. Colmenero-Hidalgo, E. Zahn, Rainer Peck, V. L. Hemming, S. R. |
author_sort |
Hall, Ian R. |
title |
Centennial- to millennial-scale ice-ocean interactions in the subpolar northeast Atlantic 18-41 kyr ago |
title_short |
Centennial- to millennial-scale ice-ocean interactions in the subpolar northeast Atlantic 18-41 kyr ago |
title_full |
Centennial- to millennial-scale ice-ocean interactions in the subpolar northeast Atlantic 18-41 kyr ago |
title_fullStr |
Centennial- to millennial-scale ice-ocean interactions in the subpolar northeast Atlantic 18-41 kyr ago |
title_full_unstemmed |
Centennial- to millennial-scale ice-ocean interactions in the subpolar northeast Atlantic 18-41 kyr ago |
title_sort |
centennial- to millennial-scale ice-ocean interactions in the subpolar northeast atlantic 18-41 kyr ago |
publishDate |
2011 |
url |
https://ddd.uab.cat/record/25426 |
genre |
Dansgaard-Oeschger events Greenland Ice Sheet Neogloboquadrina pachyderma Nordic Seas north atlantic current North Atlantic Northeast Atlantic Planktonic foraminifera |
genre_facet |
Dansgaard-Oeschger events Greenland Ice Sheet Neogloboquadrina pachyderma Nordic Seas north atlantic current North Atlantic Northeast Atlantic Planktonic foraminifera |
op_relation |
Ministerio de EconomÃa y Competitividad GGL2007/61579/CLI Paleoceanography Vol. 26, Issue 2 (June 2011), p. PA2224 https://ddd.uab.cat/record/25426 urn:10.1029/2010PA002084 urn:oai:ddd.uab.cat:25426 urn:recercauab:ARE-69108 urn:scopus_id:79960003586 urn:wos_id:000292396500002 urn:oai:egreta.uab.cat:publications/729627d8-1ca5-4c48-9db7-9fd4e4f28e22 |
op_rights |
open access Tots els drets reservats. https://rightsstatements.org/vocab/InC/1.0/ |
container_title |
Paleoceanography |
container_volume |
26 |
container_issue |
2 |
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n/a |
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1810440983333044224 |