High resolution evidence for linkages between NW European ice sheet instability and Atlantic Meridional Overturning Circulation.
Published studies show that ice rafted debris (IRD) deposition preceding Heinrich (H) events H1 and H2 in the NE Atlantic was derived from the NW European ice sheets (NWEIS), possibly offering clues about ice sheet sensitivity and stability, and the mechanisms that caused periodic collapse of the La...
Published in: | Earth and Planetary Science Letters |
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Online Access: | http://eprints.esc.cam.ac.uk/583/ http://eprints.esc.cam.ac.uk/583/1/Elderfieldhigh1.pdf https://doi.org/10.1016/j.epsl.2005.12.023 |
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ftucambridgeesc:oai:eprints.esc.cam.ac.uk:583 2023-05-15T16:40:19+02:00 High resolution evidence for linkages between NW European ice sheet instability and Atlantic Meridional Overturning Circulation. Peck, V. L. Hall, I. R. Zahn, R. Elderfield, H. Grousset, F. Hemming, S. R. Scourse, J. D. 2006 application/pdf http://eprints.esc.cam.ac.uk/583/ http://eprints.esc.cam.ac.uk/583/1/Elderfieldhigh1.pdf https://doi.org/10.1016/j.epsl.2005.12.023 en eng http://eprints.esc.cam.ac.uk/583/1/Elderfieldhigh1.pdf Peck, V. L. and Hall, I. R. and Zahn, R. and Elderfield, H. and Grousset, F. and Hemming, S. R. and Scourse, J. D. (2006) High resolution evidence for linkages between NW European ice sheet instability and Atlantic Meridional Overturning Circulation. Earth and Planetary Science Letters, 243. pp. 476-488. DOI https://doi.org/10.1016/j.epsl.2005.12.023 <https://doi.org/10.1016/j.epsl.2005.12.023> Article PeerReviewed 2006 ftucambridgeesc https://doi.org/10.1016/j.epsl.2005.12.023 2020-08-27T18:08:35Z Published studies show that ice rafted debris (IRD) deposition preceding Heinrich (H) events H1 and H2 in the NE Atlantic was derived from the NW European ice sheets (NWEIS), possibly offering clues about ice sheet sensitivity and stability, and the mechanisms that caused periodic collapse of the Laurentide Ice Sheet (LIS). We present detailed lithological and geochemical records, including radiogenic isotope fingerprinting, of IRD deposits from core MD01-2461, proximal to the last glacial British Ice Sheet (BIS), demonstrating persistent instability of the BIS, with significant destabilisation occurring 1.5–1.9 kyr prior to both H1 and H2, dated at 16.9 and 24.1 kyr BP, respectively, in the NE Atlantic. Paired Mg/Ca and δ18O data from the surface dwelling Globigerina bulloides and subsurface dwelling Neogloboquadrina pachyderma sinistral are used to determine lateglacial variability of temperature, salinity and stratification of the upper water column. A picture emerges that the BIS was in a continuing state of readjustment and never fully reached steady state. Increased sea surface temperatures appear to have triggered the episode of NWEIS instability preceding H1. It seems most probable that the so-called ‘precursor’ events were not linked to the H events. However, if response to a common thermal forcing is considered, an increased response time of the LIS, up to ~2 kyr longer than the NWEIS, may be inferred. Negative salinity excursions of up to 2.6 indicate significant incursions of melt water associated with peaks in NWEIS instability. Decreased surface density led to a more stable stratification of the upper water column and is associated with reduced ventilation of intermediate waters, recorded in depleted epibenthic δ13C (Cibicidoides wuellerstorfi). We suggest that instability and meltwater forcing of the NWEIS temporarily weakened Atlantic Meridional Overturning Circulation, allowing transient advance of southern-sourced waters to this site, prior to H events 1 and 2. © 2006 Elsevier B.V. All rights reserved. Article in Journal/Newspaper Ice Sheet Neogloboquadrina pachyderma University of Cambridge, Department of Earth Sciences: ESC Publications Earth and Planetary Science Letters 243 3-4 476 488 |
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Open Polar |
collection |
University of Cambridge, Department of Earth Sciences: ESC Publications |
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ftucambridgeesc |
language |
English |
description |
Published studies show that ice rafted debris (IRD) deposition preceding Heinrich (H) events H1 and H2 in the NE Atlantic was derived from the NW European ice sheets (NWEIS), possibly offering clues about ice sheet sensitivity and stability, and the mechanisms that caused periodic collapse of the Laurentide Ice Sheet (LIS). We present detailed lithological and geochemical records, including radiogenic isotope fingerprinting, of IRD deposits from core MD01-2461, proximal to the last glacial British Ice Sheet (BIS), demonstrating persistent instability of the BIS, with significant destabilisation occurring 1.5–1.9 kyr prior to both H1 and H2, dated at 16.9 and 24.1 kyr BP, respectively, in the NE Atlantic. Paired Mg/Ca and δ18O data from the surface dwelling Globigerina bulloides and subsurface dwelling Neogloboquadrina pachyderma sinistral are used to determine lateglacial variability of temperature, salinity and stratification of the upper water column. A picture emerges that the BIS was in a continuing state of readjustment and never fully reached steady state. Increased sea surface temperatures appear to have triggered the episode of NWEIS instability preceding H1. It seems most probable that the so-called ‘precursor’ events were not linked to the H events. However, if response to a common thermal forcing is considered, an increased response time of the LIS, up to ~2 kyr longer than the NWEIS, may be inferred. Negative salinity excursions of up to 2.6 indicate significant incursions of melt water associated with peaks in NWEIS instability. Decreased surface density led to a more stable stratification of the upper water column and is associated with reduced ventilation of intermediate waters, recorded in depleted epibenthic δ13C (Cibicidoides wuellerstorfi). We suggest that instability and meltwater forcing of the NWEIS temporarily weakened Atlantic Meridional Overturning Circulation, allowing transient advance of southern-sourced waters to this site, prior to H events 1 and 2. © 2006 Elsevier B.V. All rights reserved. |
format |
Article in Journal/Newspaper |
author |
Peck, V. L. Hall, I. R. Zahn, R. Elderfield, H. Grousset, F. Hemming, S. R. Scourse, J. D. |
spellingShingle |
Peck, V. L. Hall, I. R. Zahn, R. Elderfield, H. Grousset, F. Hemming, S. R. Scourse, J. D. High resolution evidence for linkages between NW European ice sheet instability and Atlantic Meridional Overturning Circulation. |
author_facet |
Peck, V. L. Hall, I. R. Zahn, R. Elderfield, H. Grousset, F. Hemming, S. R. Scourse, J. D. |
author_sort |
Peck, V. L. |
title |
High resolution evidence for linkages between NW European ice sheet instability and Atlantic Meridional Overturning Circulation. |
title_short |
High resolution evidence for linkages between NW European ice sheet instability and Atlantic Meridional Overturning Circulation. |
title_full |
High resolution evidence for linkages between NW European ice sheet instability and Atlantic Meridional Overturning Circulation. |
title_fullStr |
High resolution evidence for linkages between NW European ice sheet instability and Atlantic Meridional Overturning Circulation. |
title_full_unstemmed |
High resolution evidence for linkages between NW European ice sheet instability and Atlantic Meridional Overturning Circulation. |
title_sort |
high resolution evidence for linkages between nw european ice sheet instability and atlantic meridional overturning circulation. |
publishDate |
2006 |
url |
http://eprints.esc.cam.ac.uk/583/ http://eprints.esc.cam.ac.uk/583/1/Elderfieldhigh1.pdf https://doi.org/10.1016/j.epsl.2005.12.023 |
genre |
Ice Sheet Neogloboquadrina pachyderma |
genre_facet |
Ice Sheet Neogloboquadrina pachyderma |
op_relation |
http://eprints.esc.cam.ac.uk/583/1/Elderfieldhigh1.pdf Peck, V. L. and Hall, I. R. and Zahn, R. and Elderfield, H. and Grousset, F. and Hemming, S. R. and Scourse, J. D. (2006) High resolution evidence for linkages between NW European ice sheet instability and Atlantic Meridional Overturning Circulation. Earth and Planetary Science Letters, 243. pp. 476-488. DOI https://doi.org/10.1016/j.epsl.2005.12.023 <https://doi.org/10.1016/j.epsl.2005.12.023> |
op_doi |
https://doi.org/10.1016/j.epsl.2005.12.023 |
container_title |
Earth and Planetary Science Letters |
container_volume |
243 |
container_issue |
3-4 |
container_start_page |
476 |
op_container_end_page |
488 |
_version_ |
1766030698969300992 |