Correlation of Ice-Rafted Detritus in South Atlantic Sediments with Climate Proxies in Polar Ice over the Last Glacial Period
Previous study identified 6–7 millennial-scale episodes of South Atlantic ice-rafted sediment deposition (SA events) during the glaciation. Questions remain, however, regarding their origin, significance for sea-ice and/or Antarctic ice-sheet dynamics, and relationship to climate. Here I correlate s...
Published in: | The International Journal of Ocean and Climate Systems |
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Online Access: | http://dx.doi.org/10.1260/1759-3131.4.1.1 http://journals.sagepub.com/doi/pdf/10.1260/1759-3131.4.1.1 |
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crsagepubl:10.1260/1759-3131.4.1.1 2023-05-15T14:12:43+02:00 Correlation of Ice-Rafted Detritus in South Atlantic Sediments with Climate Proxies in Polar Ice over the Last Glacial Period Kanfoush, Sharon L. 2013 http://dx.doi.org/10.1260/1759-3131.4.1.1 http://journals.sagepub.com/doi/pdf/10.1260/1759-3131.4.1.1 en eng SAGE Publications http://journals.sagepub.com/page/policies/text-and-data-mining-license The International Journal of Ocean and Climate Systems volume 4, issue 1, page 1-20 ISSN 1759-3131 1759-314X journal-article 2013 crsagepubl https://doi.org/10.1260/1759-3131.4.1.1 2022-04-14T04:48:28Z Previous study identified 6–7 millennial-scale episodes of South Atlantic ice-rafted sediment deposition (SA events) during the glaciation. Questions remain, however, regarding their origin, significance for sea-ice and/or Antarctic ice-sheet dynamics, and relationship to climate. Here I correlate sediment core (TTN057–21) SA events to Greenland and Antarctic ice using two independent methods, stable isotopes and geomagnetic paleointensity, placing SA events in the context of polar climate change in both hemispheres. Marine isotopic stage (MIS) 3 SA events generally coincided with Greenland interstadials and with cooling following Antarctic warm events (A1-A4). This anti-phase behavior is best illustrated when SA0 coincided with both the Antarctic Cold Reversal and Bolling-Allerod warming in Greenland. Moreover, SA events coincide with sea-level rises during the deglaciation (mwp1A) and MIS 3 (30.4, 38.3, 43.7, 51.5 ka), implying unpinning of grounded Weddell Sea region ice masses discharged debris-laden bergs that had a chilling effect on South Atlantic surface temperatures. Article in Journal/Newspaper Antarc* Antarctic Greenland Ice Sheet Sea ice Weddell Sea SAGE Publications (via Crossref) Antarctic Greenland The Antarctic Weddell Weddell Sea The International Journal of Ocean and Climate Systems 4 1 1 20 |
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Open Polar |
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SAGE Publications (via Crossref) |
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crsagepubl |
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English |
description |
Previous study identified 6–7 millennial-scale episodes of South Atlantic ice-rafted sediment deposition (SA events) during the glaciation. Questions remain, however, regarding their origin, significance for sea-ice and/or Antarctic ice-sheet dynamics, and relationship to climate. Here I correlate sediment core (TTN057–21) SA events to Greenland and Antarctic ice using two independent methods, stable isotopes and geomagnetic paleointensity, placing SA events in the context of polar climate change in both hemispheres. Marine isotopic stage (MIS) 3 SA events generally coincided with Greenland interstadials and with cooling following Antarctic warm events (A1-A4). This anti-phase behavior is best illustrated when SA0 coincided with both the Antarctic Cold Reversal and Bolling-Allerod warming in Greenland. Moreover, SA events coincide with sea-level rises during the deglaciation (mwp1A) and MIS 3 (30.4, 38.3, 43.7, 51.5 ka), implying unpinning of grounded Weddell Sea region ice masses discharged debris-laden bergs that had a chilling effect on South Atlantic surface temperatures. |
format |
Article in Journal/Newspaper |
author |
Kanfoush, Sharon L. |
spellingShingle |
Kanfoush, Sharon L. Correlation of Ice-Rafted Detritus in South Atlantic Sediments with Climate Proxies in Polar Ice over the Last Glacial Period |
author_facet |
Kanfoush, Sharon L. |
author_sort |
Kanfoush, Sharon L. |
title |
Correlation of Ice-Rafted Detritus in South Atlantic Sediments with Climate Proxies in Polar Ice over the Last Glacial Period |
title_short |
Correlation of Ice-Rafted Detritus in South Atlantic Sediments with Climate Proxies in Polar Ice over the Last Glacial Period |
title_full |
Correlation of Ice-Rafted Detritus in South Atlantic Sediments with Climate Proxies in Polar Ice over the Last Glacial Period |
title_fullStr |
Correlation of Ice-Rafted Detritus in South Atlantic Sediments with Climate Proxies in Polar Ice over the Last Glacial Period |
title_full_unstemmed |
Correlation of Ice-Rafted Detritus in South Atlantic Sediments with Climate Proxies in Polar Ice over the Last Glacial Period |
title_sort |
correlation of ice-rafted detritus in south atlantic sediments with climate proxies in polar ice over the last glacial period |
publisher |
SAGE Publications |
publishDate |
2013 |
url |
http://dx.doi.org/10.1260/1759-3131.4.1.1 http://journals.sagepub.com/doi/pdf/10.1260/1759-3131.4.1.1 |
geographic |
Antarctic Greenland The Antarctic Weddell Weddell Sea |
geographic_facet |
Antarctic Greenland The Antarctic Weddell Weddell Sea |
genre |
Antarc* Antarctic Greenland Ice Sheet Sea ice Weddell Sea |
genre_facet |
Antarc* Antarctic Greenland Ice Sheet Sea ice Weddell Sea |
op_source |
The International Journal of Ocean and Climate Systems volume 4, issue 1, page 1-20 ISSN 1759-3131 1759-314X |
op_rights |
http://journals.sagepub.com/page/policies/text-and-data-mining-license |
op_doi |
https://doi.org/10.1260/1759-3131.4.1.1 |
container_title |
The International Journal of Ocean and Climate Systems |
container_volume |
4 |
container_issue |
1 |
container_start_page |
1 |
op_container_end_page |
20 |
_version_ |
1766285061417598976 |