Marine records of iceberg-rafted debris (IBRD) from sediment cores MD07-3133 and MD07-3134
Our understanding of the deglacial evolution of the Antarctic Ice Sheet (AIS) following the Last Glacial Maximum (26,000-19,000 years ago) is based largely on a few well-dated but temporally and geographically restricted terrestrial and shallow-marine sequences. This sparseness limits our understand...
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ftpangaea:oai:pangaea.de:doi:10.1594/PANGAEA.819646 2023-05-15T13:42:11+02:00 Marine records of iceberg-rafted debris (IBRD) from sediment cores MD07-3133 and MD07-3134 Weber, Michael E Clark, Peter U Kuhn, Gerhard Timmermann, Axel Sprenk, Daniela Gladstone, Rupert Zhang, Xu Lohmann, Gerrit Menviel, Laurie Chikamoto, Megumi Friedrich, Torsten Ohlwein, Christian MEDIAN LATITUDE: -58.427400 * MEDIAN LONGITUDE: -42.465400 * SOUTH-BOUND LATITUDE: -59.410800 * WEST-BOUND LONGITUDE: -43.457800 * NORTH-BOUND LATITUDE: -57.444000 * EAST-BOUND LONGITUDE: -41.473000 * DATE/TIME START: 2007-03-05T17:30:00 * DATE/TIME END: 2007-03-06T16:10:00 2014-09-23 application/zip, 7 datasets https://doi.pangaea.de/10.1594/PANGAEA.819646 https://doi.org/10.1594/PANGAEA.819646 en eng PANGAEA https://doi.pangaea.de/10.1594/PANGAEA.819646 https://doi.org/10.1594/PANGAEA.819646 CC-BY-3.0: Creative Commons Attribution 3.0 Unported Access constraints: unrestricted info:eu-repo/semantics/openAccess CC-BY Supplement to: Weber, Michael E; Clark, Peter U; Kuhn, Gerhard; Timmermann, Axel; Sprenk, Daniela; Gladstone, Rupert; Zhang, Xu; Lohmann, Gerrit; Menviel, Laurie; Chikamoto, Megumi; Friedrich, Torsten; Ohlwein, Christian (2014): Millennial-scale variability in Antarctic ice-sheet discharge during the last deglaciation. Nature, 510(7503), 134-138, https://doi.org/10.1038/nature13397 Dataset 2014 ftpangaea https://doi.org/10.1594/PANGAEA.819646 https://doi.org/10.1038/nature13397 2023-01-20T07:33:08Z Our understanding of the deglacial evolution of the Antarctic Ice Sheet (AIS) following the Last Glacial Maximum (26,000-19,000 years ago) is based largely on a few well-dated but temporally and geographically restricted terrestrial and shallow-marine sequences. This sparseness limits our understanding of the dominant feedbacks between the AIS, Southern Hemisphere climate and global sea level. Marine records of iceberg-rafted debris (IBRD) provide a nearly continuous signal of ice-sheet dynamics and variability. IBRD records from the North Atlantic Ocean have been widely used to reconstruct variability in Northern Hemisphere ice sheets, but comparable records from the Southern Ocean of the AIS are lacking because of the low resolution and large dating uncertainties in existing sediment cores. Here we present two well-dated, high-resolution IBRD records that capture a spatially integrated signal of AIS variability during the last deglaciation. We document eight events of increased iceberg flux from various parts of the AIS between 20,000 and 9,000 years ago, in marked contrast to previous scenarios which identified the main AIS retreat as occurring after meltwater pulse 1A and continuing into the late Holocene epoch. The highest IBRD flux occurred 14,600 years ago, providing the first direct evidence for an Antarctic contribution to meltwater pulse 1A. Climate model simulations with AIS freshwater forcing identify a positive feedback between poleward transport of Circumpolar Deep Water, subsurface warming and AIS melt, suggesting that small perturbations to the ice sheet can be substantially enhanced, providing a possible mechanism for rapid sea-level rise. Dataset Antarc* Antarctic Ice Sheet Iceberg* North Atlantic Southern Ocean PANGAEA - Data Publisher for Earth & Environmental Science Antarctic Southern Ocean The Antarctic ENVELOPE(-43.457800,-41.473000,-57.444000,-59.410800) |
institution |
Open Polar |
collection |
PANGAEA - Data Publisher for Earth & Environmental Science |
op_collection_id |
ftpangaea |
language |
English |
description |
Our understanding of the deglacial evolution of the Antarctic Ice Sheet (AIS) following the Last Glacial Maximum (26,000-19,000 years ago) is based largely on a few well-dated but temporally and geographically restricted terrestrial and shallow-marine sequences. This sparseness limits our understanding of the dominant feedbacks between the AIS, Southern Hemisphere climate and global sea level. Marine records of iceberg-rafted debris (IBRD) provide a nearly continuous signal of ice-sheet dynamics and variability. IBRD records from the North Atlantic Ocean have been widely used to reconstruct variability in Northern Hemisphere ice sheets, but comparable records from the Southern Ocean of the AIS are lacking because of the low resolution and large dating uncertainties in existing sediment cores. Here we present two well-dated, high-resolution IBRD records that capture a spatially integrated signal of AIS variability during the last deglaciation. We document eight events of increased iceberg flux from various parts of the AIS between 20,000 and 9,000 years ago, in marked contrast to previous scenarios which identified the main AIS retreat as occurring after meltwater pulse 1A and continuing into the late Holocene epoch. The highest IBRD flux occurred 14,600 years ago, providing the first direct evidence for an Antarctic contribution to meltwater pulse 1A. Climate model simulations with AIS freshwater forcing identify a positive feedback between poleward transport of Circumpolar Deep Water, subsurface warming and AIS melt, suggesting that small perturbations to the ice sheet can be substantially enhanced, providing a possible mechanism for rapid sea-level rise. |
format |
Dataset |
author |
Weber, Michael E Clark, Peter U Kuhn, Gerhard Timmermann, Axel Sprenk, Daniela Gladstone, Rupert Zhang, Xu Lohmann, Gerrit Menviel, Laurie Chikamoto, Megumi Friedrich, Torsten Ohlwein, Christian |
spellingShingle |
Weber, Michael E Clark, Peter U Kuhn, Gerhard Timmermann, Axel Sprenk, Daniela Gladstone, Rupert Zhang, Xu Lohmann, Gerrit Menviel, Laurie Chikamoto, Megumi Friedrich, Torsten Ohlwein, Christian Marine records of iceberg-rafted debris (IBRD) from sediment cores MD07-3133 and MD07-3134 |
author_facet |
Weber, Michael E Clark, Peter U Kuhn, Gerhard Timmermann, Axel Sprenk, Daniela Gladstone, Rupert Zhang, Xu Lohmann, Gerrit Menviel, Laurie Chikamoto, Megumi Friedrich, Torsten Ohlwein, Christian |
author_sort |
Weber, Michael E |
title |
Marine records of iceberg-rafted debris (IBRD) from sediment cores MD07-3133 and MD07-3134 |
title_short |
Marine records of iceberg-rafted debris (IBRD) from sediment cores MD07-3133 and MD07-3134 |
title_full |
Marine records of iceberg-rafted debris (IBRD) from sediment cores MD07-3133 and MD07-3134 |
title_fullStr |
Marine records of iceberg-rafted debris (IBRD) from sediment cores MD07-3133 and MD07-3134 |
title_full_unstemmed |
Marine records of iceberg-rafted debris (IBRD) from sediment cores MD07-3133 and MD07-3134 |
title_sort |
marine records of iceberg-rafted debris (ibrd) from sediment cores md07-3133 and md07-3134 |
publisher |
PANGAEA |
publishDate |
2014 |
url |
https://doi.pangaea.de/10.1594/PANGAEA.819646 https://doi.org/10.1594/PANGAEA.819646 |
op_coverage |
MEDIAN LATITUDE: -58.427400 * MEDIAN LONGITUDE: -42.465400 * SOUTH-BOUND LATITUDE: -59.410800 * WEST-BOUND LONGITUDE: -43.457800 * NORTH-BOUND LATITUDE: -57.444000 * EAST-BOUND LONGITUDE: -41.473000 * DATE/TIME START: 2007-03-05T17:30:00 * DATE/TIME END: 2007-03-06T16:10:00 |
long_lat |
ENVELOPE(-43.457800,-41.473000,-57.444000,-59.410800) |
geographic |
Antarctic Southern Ocean The Antarctic |
geographic_facet |
Antarctic Southern Ocean The Antarctic |
genre |
Antarc* Antarctic Ice Sheet Iceberg* North Atlantic Southern Ocean |
genre_facet |
Antarc* Antarctic Ice Sheet Iceberg* North Atlantic Southern Ocean |
op_source |
Supplement to: Weber, Michael E; Clark, Peter U; Kuhn, Gerhard; Timmermann, Axel; Sprenk, Daniela; Gladstone, Rupert; Zhang, Xu; Lohmann, Gerrit; Menviel, Laurie; Chikamoto, Megumi; Friedrich, Torsten; Ohlwein, Christian (2014): Millennial-scale variability in Antarctic ice-sheet discharge during the last deglaciation. Nature, 510(7503), 134-138, https://doi.org/10.1038/nature13397 |
op_relation |
https://doi.pangaea.de/10.1594/PANGAEA.819646 https://doi.org/10.1594/PANGAEA.819646 |
op_rights |
CC-BY-3.0: Creative Commons Attribution 3.0 Unported Access constraints: unrestricted info:eu-repo/semantics/openAccess |
op_rightsnorm |
CC-BY |
op_doi |
https://doi.org/10.1594/PANGAEA.819646 https://doi.org/10.1038/nature13397 |
_version_ |
1766164546613936128 |