Freshwater influx, hydrographic reorganization and the dispersal of ice‐rafted detritus in the sub‐polar North Atlantic Ocean during the last deglaciation
ABSTRACT A sediment core from the north‐east North Atlantic contains high‐resolution co‐registered foraminiferal δ 18 O and ice‐rafted detritus (IRD) records for the last deglaciation. These reveal a distinct ice‐rafting event that occurred at the time of Greenland Interstade 1d (GI‐1d), a feature a...
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crwiley:10.1002/jqs.2644 2024-06-23T07:53:22+00:00 Freshwater influx, hydrographic reorganization and the dispersal of ice‐rafted detritus in the sub‐polar North Atlantic Ocean during the last deglaciation SMALL, DAVID AUSTIN, WILLIAM RINTERKNECHT, VINCENT WENA was provided from the NERC RAPID programme, NERC RCL 2013 http://dx.doi.org/10.1002/jqs.2644 https://api.wiley.com/onlinelibrary/tdm/v1/articles/10.1002%2Fjqs.2644 https://onlinelibrary.wiley.com/doi/pdf/10.1002/jqs.2644 en eng Wiley http://onlinelibrary.wiley.com/termsAndConditions#vor Journal of Quaternary Science volume 28, issue 5, page 527-535 ISSN 0267-8179 1099-1417 journal-article 2013 crwiley https://doi.org/10.1002/jqs.2644 2024-06-04T06:46:44Z ABSTRACT A sediment core from the north‐east North Atlantic contains high‐resolution co‐registered foraminiferal δ 18 O and ice‐rafted detritus (IRD) records for the last deglaciation. These reveal a distinct ice‐rafting event that occurred at the time of Greenland Interstade 1d (GI‐1d), a feature also seen in other high‐resolution cores from the North Atlantic. The occurrence of a geographically widespread peak in IRD at ice distal sites at a time when increased freshwater flux to the surface ocean is inferred to have caused rapid cooling suggests a mechanistic link between the processes, analogous to the Younger Dryas (GS‐1) cooling episode. The general absence of IRD at southern locations at other times during GI‐1 when the flux of icebergs from surviving ice sheets to northern locations continued suggests that the GI‐1d IRD peak represents a time of hyrdrographic reorganization which changed IRD dispersal. While numerous studies have suggested freshwater flux as a major driver of rapid climate oscillations observed around the North Atlantic during the last deglaciation, the evidence presented here both supports that mechanism and highlights the potential for rapid and major reorganization of the North Atlantic's surface hydrography to explain changes in IRD flux independently of ice sheet calving dynamics. Article in Journal/Newspaper Greenland Ice Sheet North Atlantic Wiley Online Library Greenland Journal of Quaternary Science 28 5 527 535 |
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Wiley Online Library |
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crwiley |
language |
English |
description |
ABSTRACT A sediment core from the north‐east North Atlantic contains high‐resolution co‐registered foraminiferal δ 18 O and ice‐rafted detritus (IRD) records for the last deglaciation. These reveal a distinct ice‐rafting event that occurred at the time of Greenland Interstade 1d (GI‐1d), a feature also seen in other high‐resolution cores from the North Atlantic. The occurrence of a geographically widespread peak in IRD at ice distal sites at a time when increased freshwater flux to the surface ocean is inferred to have caused rapid cooling suggests a mechanistic link between the processes, analogous to the Younger Dryas (GS‐1) cooling episode. The general absence of IRD at southern locations at other times during GI‐1 when the flux of icebergs from surviving ice sheets to northern locations continued suggests that the GI‐1d IRD peak represents a time of hyrdrographic reorganization which changed IRD dispersal. While numerous studies have suggested freshwater flux as a major driver of rapid climate oscillations observed around the North Atlantic during the last deglaciation, the evidence presented here both supports that mechanism and highlights the potential for rapid and major reorganization of the North Atlantic's surface hydrography to explain changes in IRD flux independently of ice sheet calving dynamics. |
author2 |
WENA was provided from the NERC RAPID programme, NERC RCL |
format |
Article in Journal/Newspaper |
author |
SMALL, DAVID AUSTIN, WILLIAM RINTERKNECHT, VINCENT |
spellingShingle |
SMALL, DAVID AUSTIN, WILLIAM RINTERKNECHT, VINCENT Freshwater influx, hydrographic reorganization and the dispersal of ice‐rafted detritus in the sub‐polar North Atlantic Ocean during the last deglaciation |
author_facet |
SMALL, DAVID AUSTIN, WILLIAM RINTERKNECHT, VINCENT |
author_sort |
SMALL, DAVID |
title |
Freshwater influx, hydrographic reorganization and the dispersal of ice‐rafted detritus in the sub‐polar North Atlantic Ocean during the last deglaciation |
title_short |
Freshwater influx, hydrographic reorganization and the dispersal of ice‐rafted detritus in the sub‐polar North Atlantic Ocean during the last deglaciation |
title_full |
Freshwater influx, hydrographic reorganization and the dispersal of ice‐rafted detritus in the sub‐polar North Atlantic Ocean during the last deglaciation |
title_fullStr |
Freshwater influx, hydrographic reorganization and the dispersal of ice‐rafted detritus in the sub‐polar North Atlantic Ocean during the last deglaciation |
title_full_unstemmed |
Freshwater influx, hydrographic reorganization and the dispersal of ice‐rafted detritus in the sub‐polar North Atlantic Ocean during the last deglaciation |
title_sort |
freshwater influx, hydrographic reorganization and the dispersal of ice‐rafted detritus in the sub‐polar north atlantic ocean during the last deglaciation |
publisher |
Wiley |
publishDate |
2013 |
url |
http://dx.doi.org/10.1002/jqs.2644 https://api.wiley.com/onlinelibrary/tdm/v1/articles/10.1002%2Fjqs.2644 https://onlinelibrary.wiley.com/doi/pdf/10.1002/jqs.2644 |
geographic |
Greenland |
geographic_facet |
Greenland |
genre |
Greenland Ice Sheet North Atlantic |
genre_facet |
Greenland Ice Sheet North Atlantic |
op_source |
Journal of Quaternary Science volume 28, issue 5, page 527-535 ISSN 0267-8179 1099-1417 |
op_rights |
http://onlinelibrary.wiley.com/termsAndConditions#vor |
op_doi |
https://doi.org/10.1002/jqs.2644 |
container_title |
Journal of Quaternary Science |
container_volume |
28 |
container_issue |
5 |
container_start_page |
527 |
op_container_end_page |
535 |
_version_ |
1802644974233190400 |