Source, timing, frequency and flux of ice-rafted detritus to the Northeast Atlantic margin, 30-12 ka: testing the Heinrich precursor hypothesis
Increased fluxes of ice-rafted detritus (IRD) from European ice sheets have been documented some 1000–1500 years before the arrival of Laurentide Ice Sheet (LIS)-sourced IRD during Heinrich (H) events. These early fluxes have become known as ‘precursor events’, and it has been suggested that they ha...
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ftunivcardiff:oai:https://orca.cardiff.ac.uk:11273 2023-05-15T16:40:15+02:00 Source, timing, frequency and flux of ice-rafted detritus to the Northeast Atlantic margin, 30-12 ka: testing the Heinrich precursor hypothesis Haapaniemi, Anna I. Scourse, James D. Peck, Victoria Louise Kennedy, Hilary Kennedy, Paul Hemming, Sidney R. Furze, Mark F. A. Pienkowski, Anna J. Austin, William E. N. Walden, John Wadsworth, Emilie Hall, Ian Robert 2010-07 https://orca.cardiff.ac.uk/id/eprint/11273/ https://doi.org/10.1111/j.1502-3885.2010.00141.x unknown Wiley-Blackwell Haapaniemi, Anna I., Scourse, James D., Peck, Victoria Louise https://orca.cardiff.ac.uk/view/cardiffauthors/A010093B.html, Kennedy, Hilary, Kennedy, Paul, Hemming, Sidney R., Furze, Mark F. A., Pienkowski, Anna J., Austin, William E. N., Walden, John, Wadsworth, Emilie and Hall, Ian Robert https://orca.cardiff.ac.uk/view/cardiffauthors/A002402L.html orcid:0000-0001-6960-1419 orcid:0000-0001-6960-1419 2010. Source, timing, frequency and flux of ice-rafted detritus to the Northeast Atlantic margin, 30-12 ka: testing the Heinrich precursor hypothesis. Boreas 39 (3) , pp. 576-591. 10.1111/j.1502-3885.2010.00141.x https://doi.org/10.1111/j.1502-3885.2010.00141.x doi:10.1111/j.1502-3885.2010.00141.x QE Geology Article PeerReviewed 2010 ftunivcardiff https://doi.org/10.1111/j.1502-3885.2010.00141.x 2022-10-20T22:34:33Z Increased fluxes of ice-rafted detritus (IRD) from European ice sheets have been documented some 1000–1500 years before the arrival of Laurentide Ice Sheet (LIS)-sourced IRD during Heinrich (H) events. These early fluxes have become known as ‘precursor events’, and it has been suggested that they have mechanistic significance in the propagation of H events. Here we present a re-analysis of one of the main cores used to generate the precursor concept, OMEX-2K from the Goban Spur covering the last 30 ka, in order to identify whether the British–Irish Ice Sheet (BIIS) IRD fluxes occur only as precursors before H layers. IRD characterization and planktonic foraminiferal δ18O measurements constrained by a new age model have enabled the generation of a continuous record of IRD sources, timing, frequency and flux, and of local contemporary hydrographic conditions. The evidence indicates that BIIS IRD precursors are not uniquely, or mechanistically, linked to H events, but are part of the pervasive millennial-scale cyclicity. Our results support an LIS source for the IRD comprising H layers, but the ambient glacial sections are dominated by assemblages typical of the Irish Sea Ice Stream. Light isotope excursions associated with H events are interpreted as resulting from the melting of the BIIS, with ice-sheet destabilization attributed to eustatic jumps generated by LIS discharge during H events. This positive-feedback mechanism probably caused similar responses in all circum-Atlantic ice-sheet margins, and the resulting gross freshwater flux contributed to the perturbation of the Atlantic Meridional Overturning Circulation during H events. Article in Journal/Newspaper Ice Sheet Northeast Atlantic Sea ice Cardiff University: ORCA (Online Research @ Cardiff) Boreas no no |
institution |
Open Polar |
collection |
Cardiff University: ORCA (Online Research @ Cardiff) |
op_collection_id |
ftunivcardiff |
language |
unknown |
topic |
QE Geology |
spellingShingle |
QE Geology Haapaniemi, Anna I. Scourse, James D. Peck, Victoria Louise Kennedy, Hilary Kennedy, Paul Hemming, Sidney R. Furze, Mark F. A. Pienkowski, Anna J. Austin, William E. N. Walden, John Wadsworth, Emilie Hall, Ian Robert Source, timing, frequency and flux of ice-rafted detritus to the Northeast Atlantic margin, 30-12 ka: testing the Heinrich precursor hypothesis |
topic_facet |
QE Geology |
description |
Increased fluxes of ice-rafted detritus (IRD) from European ice sheets have been documented some 1000–1500 years before the arrival of Laurentide Ice Sheet (LIS)-sourced IRD during Heinrich (H) events. These early fluxes have become known as ‘precursor events’, and it has been suggested that they have mechanistic significance in the propagation of H events. Here we present a re-analysis of one of the main cores used to generate the precursor concept, OMEX-2K from the Goban Spur covering the last 30 ka, in order to identify whether the British–Irish Ice Sheet (BIIS) IRD fluxes occur only as precursors before H layers. IRD characterization and planktonic foraminiferal δ18O measurements constrained by a new age model have enabled the generation of a continuous record of IRD sources, timing, frequency and flux, and of local contemporary hydrographic conditions. The evidence indicates that BIIS IRD precursors are not uniquely, or mechanistically, linked to H events, but are part of the pervasive millennial-scale cyclicity. Our results support an LIS source for the IRD comprising H layers, but the ambient glacial sections are dominated by assemblages typical of the Irish Sea Ice Stream. Light isotope excursions associated with H events are interpreted as resulting from the melting of the BIIS, with ice-sheet destabilization attributed to eustatic jumps generated by LIS discharge during H events. This positive-feedback mechanism probably caused similar responses in all circum-Atlantic ice-sheet margins, and the resulting gross freshwater flux contributed to the perturbation of the Atlantic Meridional Overturning Circulation during H events. |
format |
Article in Journal/Newspaper |
author |
Haapaniemi, Anna I. Scourse, James D. Peck, Victoria Louise Kennedy, Hilary Kennedy, Paul Hemming, Sidney R. Furze, Mark F. A. Pienkowski, Anna J. Austin, William E. N. Walden, John Wadsworth, Emilie Hall, Ian Robert |
author_facet |
Haapaniemi, Anna I. Scourse, James D. Peck, Victoria Louise Kennedy, Hilary Kennedy, Paul Hemming, Sidney R. Furze, Mark F. A. Pienkowski, Anna J. Austin, William E. N. Walden, John Wadsworth, Emilie Hall, Ian Robert |
author_sort |
Haapaniemi, Anna I. |
title |
Source, timing, frequency and flux of ice-rafted detritus to the Northeast Atlantic margin, 30-12 ka: testing the Heinrich precursor hypothesis |
title_short |
Source, timing, frequency and flux of ice-rafted detritus to the Northeast Atlantic margin, 30-12 ka: testing the Heinrich precursor hypothesis |
title_full |
Source, timing, frequency and flux of ice-rafted detritus to the Northeast Atlantic margin, 30-12 ka: testing the Heinrich precursor hypothesis |
title_fullStr |
Source, timing, frequency and flux of ice-rafted detritus to the Northeast Atlantic margin, 30-12 ka: testing the Heinrich precursor hypothesis |
title_full_unstemmed |
Source, timing, frequency and flux of ice-rafted detritus to the Northeast Atlantic margin, 30-12 ka: testing the Heinrich precursor hypothesis |
title_sort |
source, timing, frequency and flux of ice-rafted detritus to the northeast atlantic margin, 30-12 ka: testing the heinrich precursor hypothesis |
publisher |
Wiley-Blackwell |
publishDate |
2010 |
url |
https://orca.cardiff.ac.uk/id/eprint/11273/ https://doi.org/10.1111/j.1502-3885.2010.00141.x |
genre |
Ice Sheet Northeast Atlantic Sea ice |
genre_facet |
Ice Sheet Northeast Atlantic Sea ice |
op_relation |
Haapaniemi, Anna I., Scourse, James D., Peck, Victoria Louise https://orca.cardiff.ac.uk/view/cardiffauthors/A010093B.html, Kennedy, Hilary, Kennedy, Paul, Hemming, Sidney R., Furze, Mark F. A., Pienkowski, Anna J., Austin, William E. N., Walden, John, Wadsworth, Emilie and Hall, Ian Robert https://orca.cardiff.ac.uk/view/cardiffauthors/A002402L.html orcid:0000-0001-6960-1419 orcid:0000-0001-6960-1419 2010. Source, timing, frequency and flux of ice-rafted detritus to the Northeast Atlantic margin, 30-12 ka: testing the Heinrich precursor hypothesis. Boreas 39 (3) , pp. 576-591. 10.1111/j.1502-3885.2010.00141.x https://doi.org/10.1111/j.1502-3885.2010.00141.x doi:10.1111/j.1502-3885.2010.00141.x |
op_doi |
https://doi.org/10.1111/j.1502-3885.2010.00141.x |
container_title |
Boreas |
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no |
op_container_end_page |
no |
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1766030637036208128 |