Timing of iceberg scours and massive ice-rafting events in the subtropical North Atlantic
High resolution seafloor mapping shows extraordinary evidence that massive (>300 m thick) icebergs once drifted >5,000 km south along the eastern United States, with >700 iceberg scours now identified south of Cape Hatteras. Here we report on sediment cores collected from several buried sco...
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ftpubmed:oai:pubmedcentral.nih.gov:8208987 2023-05-15T17:29:30+02:00 Timing of iceberg scours and massive ice-rafting events in the subtropical North Atlantic Condron, Alan Hill, Jenna C. 2021-06-16 http://www.ncbi.nlm.nih.gov/pmc/articles/PMC8208987/ http://www.ncbi.nlm.nih.gov/pubmed/34135345 https://doi.org/10.1038/s41467-021-23924-0 en eng Nature Publishing Group UK http://www.ncbi.nlm.nih.gov/pmc/articles/PMC8208987/ http://www.ncbi.nlm.nih.gov/pubmed/34135345 http://dx.doi.org/10.1038/s41467-021-23924-0 © The Author(s) 2021 https://creativecommons.org/licenses/by/4.0/Open Access This article is licensed under a Creative Commons Attribution 4.0 International License, which permits use, sharing, adaptation, distribution and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license, and indicate if changes were made. The images or other third party material in this article are included in the article’s Creative Commons license, unless indicated otherwise in a credit line to the material. If material is not included in the article’s Creative Commons license and your intended use is not permitted by statutory regulation or exceeds the permitted use, you will need to obtain permission directly from the copyright holder. To view a copy of this license, visit http://creativecommons.org/licenses/by/4.0/ (https://creativecommons.org/licenses/by/4.0/) . CC-BY Nat Commun Article Text 2021 ftpubmed https://doi.org/10.1038/s41467-021-23924-0 2021-07-04T00:37:53Z High resolution seafloor mapping shows extraordinary evidence that massive (>300 m thick) icebergs once drifted >5,000 km south along the eastern United States, with >700 iceberg scours now identified south of Cape Hatteras. Here we report on sediment cores collected from several buried scours that show multiple plow marks align with Heinrich Event 3 (H3), ~31,000 years ago. Numerical glacial iceberg simulations indicate that the transport of icebergs to these sites occurs during massive, but short-lived, periods of elevated meltwater discharge. Transport of icebergs to the subtropics, away from deep water formation sites, may explain why H3 was associated with only a modest increase in ice-rafting across the subpolar North Atlantic, and implies a complex relationship between freshwater forcing and climate change. Stratigraphy from subbottom data across the scour marks shows there are additional features that are both older and younger, and may align with other periods of elevated meltwater discharge. Text North Atlantic PubMed Central (PMC) Nature Communications 12 1 |
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Article Condron, Alan Hill, Jenna C. Timing of iceberg scours and massive ice-rafting events in the subtropical North Atlantic |
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description |
High resolution seafloor mapping shows extraordinary evidence that massive (>300 m thick) icebergs once drifted >5,000 km south along the eastern United States, with >700 iceberg scours now identified south of Cape Hatteras. Here we report on sediment cores collected from several buried scours that show multiple plow marks align with Heinrich Event 3 (H3), ~31,000 years ago. Numerical glacial iceberg simulations indicate that the transport of icebergs to these sites occurs during massive, but short-lived, periods of elevated meltwater discharge. Transport of icebergs to the subtropics, away from deep water formation sites, may explain why H3 was associated with only a modest increase in ice-rafting across the subpolar North Atlantic, and implies a complex relationship between freshwater forcing and climate change. Stratigraphy from subbottom data across the scour marks shows there are additional features that are both older and younger, and may align with other periods of elevated meltwater discharge. |
format |
Text |
author |
Condron, Alan Hill, Jenna C. |
author_facet |
Condron, Alan Hill, Jenna C. |
author_sort |
Condron, Alan |
title |
Timing of iceberg scours and massive ice-rafting events in the subtropical North Atlantic |
title_short |
Timing of iceberg scours and massive ice-rafting events in the subtropical North Atlantic |
title_full |
Timing of iceberg scours and massive ice-rafting events in the subtropical North Atlantic |
title_fullStr |
Timing of iceberg scours and massive ice-rafting events in the subtropical North Atlantic |
title_full_unstemmed |
Timing of iceberg scours and massive ice-rafting events in the subtropical North Atlantic |
title_sort |
timing of iceberg scours and massive ice-rafting events in the subtropical north atlantic |
publisher |
Nature Publishing Group UK |
publishDate |
2021 |
url |
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC8208987/ http://www.ncbi.nlm.nih.gov/pubmed/34135345 https://doi.org/10.1038/s41467-021-23924-0 |
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North Atlantic |
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North Atlantic |
op_source |
Nat Commun |
op_relation |
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC8208987/ http://www.ncbi.nlm.nih.gov/pubmed/34135345 http://dx.doi.org/10.1038/s41467-021-23924-0 |
op_rights |
© The Author(s) 2021 https://creativecommons.org/licenses/by/4.0/Open Access This article is licensed under a Creative Commons Attribution 4.0 International License, which permits use, sharing, adaptation, distribution and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license, and indicate if changes were made. The images or other third party material in this article are included in the article’s Creative Commons license, unless indicated otherwise in a credit line to the material. If material is not included in the article’s Creative Commons license and your intended use is not permitted by statutory regulation or exceeds the permitted use, you will need to obtain permission directly from the copyright holder. To view a copy of this license, visit http://creativecommons.org/licenses/by/4.0/ (https://creativecommons.org/licenses/by/4.0/) . |
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CC-BY |
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https://doi.org/10.1038/s41467-021-23924-0 |
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Nature Communications |
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12 |
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