Ice‐rafting patterns on the western Svalbard slope 74–0 ka: interplay between ice‐sheet activity, climate and ocean circulation
The distribution of ice‐rafted detritus ( IRD ) is studied in three cores from the western Svalbard slope (1130–1880 m water depth, 76–78°N) covering the period 74–0 ka. The aim was to provide new insight into the dynamics of the Svalbard–Barents Sea Ice Sheet during Marine Isotope Stages ( MIS ) 4–...
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crwiley:10.1111/bor.12358 2024-06-02T08:04:07+00:00 Ice‐rafting patterns on the western Svalbard slope 74–0 ka: interplay between ice‐sheet activity, climate and ocean circulation Jessen, Simon P. Rasmussen, Tine L. Universitetet i Tromsø Norges Forskningsråd 2018 http://dx.doi.org/10.1111/bor.12358 https://api.wiley.com/onlinelibrary/tdm/v1/articles/10.1111%2Fbor.12358 https://onlinelibrary.wiley.com/doi/pdf/10.1111/bor.12358 en eng Wiley http://onlinelibrary.wiley.com/termsAndConditions#vor Boreas volume 48, issue 1, page 236-256 ISSN 0300-9483 1502-3885 journal-article 2018 crwiley https://doi.org/10.1111/bor.12358 2024-05-03T10:48:49Z The distribution of ice‐rafted detritus ( IRD ) is studied in three cores from the western Svalbard slope (1130–1880 m water depth, 76–78°N) covering the period 74–0 ka. The aim was to provide new insight into the dynamics of the Svalbard–Barents Sea Ice Sheet during Marine Isotope Stages ( MIS ) 4–1 to get a better understanding of ice‐sheet interactions with changes in ocean circulation and climate on orbital and millennial (Dansgaard–Oeschger events of stadial–interstadial) time scales. The results show that concentration, flux, composition and grain‐size of IRD vary with climate and ocean temperature on both orbital and millennial time scales. The IRD consists mainly of fragments of siltstones and mono‐crystalline transparent quartz (referred to as ‘quartz’). IRD dominated by siltstones has a local Svalbard–Barents Sea source, while IRD dominated by quartz is from distant sources. Local siltstone‐rich IRD predominates in warmer climatic phases (interstadials), while the proportion of allochthonous quartz‐rich IRD increases in cold phases (glacials and stadials/Heinrich events). During the Last Glacial Maximum and early deglaciation at 24–16.1 ka, the quartz content reached up to >90%. In warm climate, local iceberg calving apparently increased and the warmer ocean surface caused faster melting. During the glacial maxima ( MIS 4 and MIS 2) and during cold stadials and Heinrich events, the local ice‐sheets must have been relatively stable with low ablation. During ice retreat phases of the MIS 4/3 and MIS 2/1 transitions, maxima in IRD deposition were dominated by local coarse‐grained IRD . These maxima correlate with episodes of climate warming, indicating a rapid, stepwise retreat of the Svalbard–Barents Sea Ice Sheet in phase with millennial‐scale climate oscillations. Article in Journal/Newspaper Barents Sea Dansgaard-Oeschger events Ice Sheet Sea ice Svalbard Svalbard-Barents Sea Ice sheet Wiley Online Library Barents Sea Svalbard Boreas 48 1 236 256 |
institution |
Open Polar |
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Wiley Online Library |
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crwiley |
language |
English |
description |
The distribution of ice‐rafted detritus ( IRD ) is studied in three cores from the western Svalbard slope (1130–1880 m water depth, 76–78°N) covering the period 74–0 ka. The aim was to provide new insight into the dynamics of the Svalbard–Barents Sea Ice Sheet during Marine Isotope Stages ( MIS ) 4–1 to get a better understanding of ice‐sheet interactions with changes in ocean circulation and climate on orbital and millennial (Dansgaard–Oeschger events of stadial–interstadial) time scales. The results show that concentration, flux, composition and grain‐size of IRD vary with climate and ocean temperature on both orbital and millennial time scales. The IRD consists mainly of fragments of siltstones and mono‐crystalline transparent quartz (referred to as ‘quartz’). IRD dominated by siltstones has a local Svalbard–Barents Sea source, while IRD dominated by quartz is from distant sources. Local siltstone‐rich IRD predominates in warmer climatic phases (interstadials), while the proportion of allochthonous quartz‐rich IRD increases in cold phases (glacials and stadials/Heinrich events). During the Last Glacial Maximum and early deglaciation at 24–16.1 ka, the quartz content reached up to >90%. In warm climate, local iceberg calving apparently increased and the warmer ocean surface caused faster melting. During the glacial maxima ( MIS 4 and MIS 2) and during cold stadials and Heinrich events, the local ice‐sheets must have been relatively stable with low ablation. During ice retreat phases of the MIS 4/3 and MIS 2/1 transitions, maxima in IRD deposition were dominated by local coarse‐grained IRD . These maxima correlate with episodes of climate warming, indicating a rapid, stepwise retreat of the Svalbard–Barents Sea Ice Sheet in phase with millennial‐scale climate oscillations. |
author2 |
Universitetet i Tromsø Norges Forskningsråd |
format |
Article in Journal/Newspaper |
author |
Jessen, Simon P. Rasmussen, Tine L. |
spellingShingle |
Jessen, Simon P. Rasmussen, Tine L. Ice‐rafting patterns on the western Svalbard slope 74–0 ka: interplay between ice‐sheet activity, climate and ocean circulation |
author_facet |
Jessen, Simon P. Rasmussen, Tine L. |
author_sort |
Jessen, Simon P. |
title |
Ice‐rafting patterns on the western Svalbard slope 74–0 ka: interplay between ice‐sheet activity, climate and ocean circulation |
title_short |
Ice‐rafting patterns on the western Svalbard slope 74–0 ka: interplay between ice‐sheet activity, climate and ocean circulation |
title_full |
Ice‐rafting patterns on the western Svalbard slope 74–0 ka: interplay between ice‐sheet activity, climate and ocean circulation |
title_fullStr |
Ice‐rafting patterns on the western Svalbard slope 74–0 ka: interplay between ice‐sheet activity, climate and ocean circulation |
title_full_unstemmed |
Ice‐rafting patterns on the western Svalbard slope 74–0 ka: interplay between ice‐sheet activity, climate and ocean circulation |
title_sort |
ice‐rafting patterns on the western svalbard slope 74–0 ka: interplay between ice‐sheet activity, climate and ocean circulation |
publisher |
Wiley |
publishDate |
2018 |
url |
http://dx.doi.org/10.1111/bor.12358 https://api.wiley.com/onlinelibrary/tdm/v1/articles/10.1111%2Fbor.12358 https://onlinelibrary.wiley.com/doi/pdf/10.1111/bor.12358 |
geographic |
Barents Sea Svalbard |
geographic_facet |
Barents Sea Svalbard |
genre |
Barents Sea Dansgaard-Oeschger events Ice Sheet Sea ice Svalbard Svalbard-Barents Sea Ice sheet |
genre_facet |
Barents Sea Dansgaard-Oeschger events Ice Sheet Sea ice Svalbard Svalbard-Barents Sea Ice sheet |
op_source |
Boreas volume 48, issue 1, page 236-256 ISSN 0300-9483 1502-3885 |
op_rights |
http://onlinelibrary.wiley.com/termsAndConditions#vor |
op_doi |
https://doi.org/10.1111/bor.12358 |
container_title |
Boreas |
container_volume |
48 |
container_issue |
1 |
container_start_page |
236 |
op_container_end_page |
256 |
_version_ |
1800748762713292800 |