Revised Postglacial Sea-Level Rise and Meltwater Pulses from Barbados
Reconstructions of postglacial sea-level rise have provided key insight into the rapid disintegration of ice-sheets and the discharge of large meltwater pulses during the last deglaciation. The most complete reconstruction is from Barbados where thick, backstepping sequences of the reef-crest coral...
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ftjoq:oai:ojs.pkp.sfu.ca:article/87 2023-06-18T03:41:13+02:00 Revised Postglacial Sea-Level Rise and Meltwater Pulses from Barbados Blanchon, Paul Medina-Valmaseda, Alexis Hibbert, Fiona D. 2021-05-10 application/pdf application/xml https://account.openquaternary.com/index.php/up-j-oq/article/view/87 https://doi.org/10.5334/oq.87 eng eng Ubiquity Press https://account.openquaternary.com/index.php/up-j-oq/article/view/87/119 https://account.openquaternary.com/index.php/up-j-oq/article/view/87/120 https://account.openquaternary.com/index.php/up-j-oq/article/view/87 doi:10.5334/oq.87 Copyright (c) 2021 The Author(s) https://creativecommons.org/licenses/by/4.0 Open Quaternary; Vol. 7 (2021); 1 2055-298X Sea level Coral Reef Reef Drowning MWP-1a MWP-1b Ice-Sheet Glacio-Eustasy Glacial Termination info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion 2021 ftjoq https://doi.org/10.5334/oq.87 2023-06-05T14:29:32Z Reconstructions of postglacial sea-level rise have provided key insight into the rapid disintegration of ice-sheets and the discharge of large meltwater pulses during the last deglaciation. The most complete reconstruction is from Barbados where thick, backstepping sequences of the reef-crest coral Acropora palmata have been recovered in cores from the insular shelf and slope off the Island’s south coast. Differences in the depth, timing, and magnitude of meltwater pulses between the Barbados reconstruction and other reefal records, however, has led to significant uncertainty in their origin, and the consequent timing of ice-sheet collapse. Here we re-analyse the published sedimentary, stratigraphic, and chronological data from Barbados, and find evidence for ex-situ data which indicates that reefal sequences contain coral clasts generated during hurricanes. By adjusting for biases caused by these ex-situ data, we provide a revised sea-level reconstruction which shows that MWP-1b was an 8–11 m rise from –53 m in ~250 years starting at 11.3 ka, which is 5 m smaller, and 150 years younger than previous estimates. It also shows that the onset of MWP-1a cannot be determined at Barbados because the downslope core sequences are not reef-crest deposits due to their association with deeper coral assemblages and lack of depositional relief. The end of this meltwater pulse can however be determined from the upslope reef, and occurred at a similar time and depth to that documented from Tahiti. Article in Journal/Newspaper Ice Sheet Open Quaternary (E-Journal) Open Quaternary 7 1 |
institution |
Open Polar |
collection |
Open Quaternary (E-Journal) |
op_collection_id |
ftjoq |
language |
English |
topic |
Sea level Coral Reef Reef Drowning MWP-1a MWP-1b Ice-Sheet Glacio-Eustasy Glacial Termination |
spellingShingle |
Sea level Coral Reef Reef Drowning MWP-1a MWP-1b Ice-Sheet Glacio-Eustasy Glacial Termination Blanchon, Paul Medina-Valmaseda, Alexis Hibbert, Fiona D. Revised Postglacial Sea-Level Rise and Meltwater Pulses from Barbados |
topic_facet |
Sea level Coral Reef Reef Drowning MWP-1a MWP-1b Ice-Sheet Glacio-Eustasy Glacial Termination |
description |
Reconstructions of postglacial sea-level rise have provided key insight into the rapid disintegration of ice-sheets and the discharge of large meltwater pulses during the last deglaciation. The most complete reconstruction is from Barbados where thick, backstepping sequences of the reef-crest coral Acropora palmata have been recovered in cores from the insular shelf and slope off the Island’s south coast. Differences in the depth, timing, and magnitude of meltwater pulses between the Barbados reconstruction and other reefal records, however, has led to significant uncertainty in their origin, and the consequent timing of ice-sheet collapse. Here we re-analyse the published sedimentary, stratigraphic, and chronological data from Barbados, and find evidence for ex-situ data which indicates that reefal sequences contain coral clasts generated during hurricanes. By adjusting for biases caused by these ex-situ data, we provide a revised sea-level reconstruction which shows that MWP-1b was an 8–11 m rise from –53 m in ~250 years starting at 11.3 ka, which is 5 m smaller, and 150 years younger than previous estimates. It also shows that the onset of MWP-1a cannot be determined at Barbados because the downslope core sequences are not reef-crest deposits due to their association with deeper coral assemblages and lack of depositional relief. The end of this meltwater pulse can however be determined from the upslope reef, and occurred at a similar time and depth to that documented from Tahiti. |
format |
Article in Journal/Newspaper |
author |
Blanchon, Paul Medina-Valmaseda, Alexis Hibbert, Fiona D. |
author_facet |
Blanchon, Paul Medina-Valmaseda, Alexis Hibbert, Fiona D. |
author_sort |
Blanchon, Paul |
title |
Revised Postglacial Sea-Level Rise and Meltwater Pulses from Barbados |
title_short |
Revised Postglacial Sea-Level Rise and Meltwater Pulses from Barbados |
title_full |
Revised Postglacial Sea-Level Rise and Meltwater Pulses from Barbados |
title_fullStr |
Revised Postglacial Sea-Level Rise and Meltwater Pulses from Barbados |
title_full_unstemmed |
Revised Postglacial Sea-Level Rise and Meltwater Pulses from Barbados |
title_sort |
revised postglacial sea-level rise and meltwater pulses from barbados |
publisher |
Ubiquity Press |
publishDate |
2021 |
url |
https://account.openquaternary.com/index.php/up-j-oq/article/view/87 https://doi.org/10.5334/oq.87 |
genre |
Ice Sheet |
genre_facet |
Ice Sheet |
op_source |
Open Quaternary; Vol. 7 (2021); 1 2055-298X |
op_relation |
https://account.openquaternary.com/index.php/up-j-oq/article/view/87/119 https://account.openquaternary.com/index.php/up-j-oq/article/view/87/120 https://account.openquaternary.com/index.php/up-j-oq/article/view/87 doi:10.5334/oq.87 |
op_rights |
Copyright (c) 2021 The Author(s) https://creativecommons.org/licenses/by/4.0 |
op_doi |
https://doi.org/10.5334/oq.87 |
container_title |
Open Quaternary |
container_volume |
7 |
container_issue |
1 |
_version_ |
1769006705288413184 |