Testing glacial isostatic adjustment models of last-interglacial sea level history in the Bahamas and Bermuda
Part of the spatial variation in the apparent sea-level record of the last interglacial (LIG) period is due to the diverse response of coastlines to glacial isostatic adjustment (GIA) processes, particularly where coastlines were close to the Laurentide Ice Sheet during the past two glacial periods....
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ftunivnebraskali:oai:digitalcommons.unl.edu:usgsstaffpub-2278 2023-11-12T04:18:53+01:00 Testing glacial isostatic adjustment models of last-interglacial sea level history in the Bahamas and Bermuda Muhs, Daniel R Simmons, Kathleen R. Schumann, R. Randall Schweig, Eugene S. Rowe, Mark P. 2020-01-01T08:00:00Z application/pdf https://digitalcommons.unl.edu/usgsstaffpub/1268 https://digitalcommons.unl.edu/context/usgsstaffpub/article/2278/viewcontent/Muhs_QSR_2020_Testing_glacial_isostatic_adjustment_models.pdf unknown DigitalCommons@University of Nebraska - Lincoln https://digitalcommons.unl.edu/usgsstaffpub/1268 https://digitalcommons.unl.edu/context/usgsstaffpub/article/2278/viewcontent/Muhs_QSR_2020_Testing_glacial_isostatic_adjustment_models.pdf USGS Staff -- Published Research Pleistocene Sea level changes North atlantic Geomorphology Coastal U–Th series Earth Sciences Geology Oceanography and Atmospheric Sciences and Meteorology Other Earth Sciences Other Environmental Sciences text 2020 ftunivnebraskali 2023-10-30T12:14:44Z Part of the spatial variation in the apparent sea-level record of the last interglacial (LIG) period is due to the diverse response of coastlines to glacial isostatic adjustment (GIA) processes, particularly where coastlines were close to the Laurentide Ice Sheet during the past two glacial periods. We tested modeled LIG paleo-sea levels on New Providence Island (NPI), Bahamas and Bermuda by investigating emergent coral patch reefs and oolitic/peloidal beach deposits. Corals with closed-system histories collected from patch reefs on NPI have ages of 128-118 ka and ooids/peloids from beach ridges have closed-system ages of 128-116 ka. Elevations of patch reefs indicate a LIG paleo-sea level of at least ~7 m to ~9 m above present. Beach ridge sediments indicate paleo-sea levels of ~5 m to ~14 m (assuming subsidence, ~7 m to ~16 m) above present during the LIG. Some, though not all of these measurements are in good agreement with GIA models of paleo-sea level that have been simulated for the Bahamas. On Bermuda, corals with closed-system histories collected from marine deposits have ages of 126-114 ka. Although coral-bearing marine deposits on Bermuda lack the precise indication of paleo-sea level provided by patch reefs and oolitic beach ridges, these sediments nevertheless provide at least a first-order estimate of paleo-sea level. Paleo-sea level records on Bermuda are consistently lower (~2 m to ~7 m) than what GIA models simulate for the LIG. The reason for the reasonable agreement with models for the Bahamas and poor agreement for Bermuda is not understood, but needs further investigation in light of the probability of a higher sea level in the near future. Text Ice Sheet North Atlantic University of Nebraska-Lincoln: DigitalCommons@UNL |
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collection |
University of Nebraska-Lincoln: DigitalCommons@UNL |
op_collection_id |
ftunivnebraskali |
language |
unknown |
topic |
Pleistocene Sea level changes North atlantic Geomorphology Coastal U–Th series Earth Sciences Geology Oceanography and Atmospheric Sciences and Meteorology Other Earth Sciences Other Environmental Sciences |
spellingShingle |
Pleistocene Sea level changes North atlantic Geomorphology Coastal U–Th series Earth Sciences Geology Oceanography and Atmospheric Sciences and Meteorology Other Earth Sciences Other Environmental Sciences Muhs, Daniel R Simmons, Kathleen R. Schumann, R. Randall Schweig, Eugene S. Rowe, Mark P. Testing glacial isostatic adjustment models of last-interglacial sea level history in the Bahamas and Bermuda |
topic_facet |
Pleistocene Sea level changes North atlantic Geomorphology Coastal U–Th series Earth Sciences Geology Oceanography and Atmospheric Sciences and Meteorology Other Earth Sciences Other Environmental Sciences |
description |
Part of the spatial variation in the apparent sea-level record of the last interglacial (LIG) period is due to the diverse response of coastlines to glacial isostatic adjustment (GIA) processes, particularly where coastlines were close to the Laurentide Ice Sheet during the past two glacial periods. We tested modeled LIG paleo-sea levels on New Providence Island (NPI), Bahamas and Bermuda by investigating emergent coral patch reefs and oolitic/peloidal beach deposits. Corals with closed-system histories collected from patch reefs on NPI have ages of 128-118 ka and ooids/peloids from beach ridges have closed-system ages of 128-116 ka. Elevations of patch reefs indicate a LIG paleo-sea level of at least ~7 m to ~9 m above present. Beach ridge sediments indicate paleo-sea levels of ~5 m to ~14 m (assuming subsidence, ~7 m to ~16 m) above present during the LIG. Some, though not all of these measurements are in good agreement with GIA models of paleo-sea level that have been simulated for the Bahamas. On Bermuda, corals with closed-system histories collected from marine deposits have ages of 126-114 ka. Although coral-bearing marine deposits on Bermuda lack the precise indication of paleo-sea level provided by patch reefs and oolitic beach ridges, these sediments nevertheless provide at least a first-order estimate of paleo-sea level. Paleo-sea level records on Bermuda are consistently lower (~2 m to ~7 m) than what GIA models simulate for the LIG. The reason for the reasonable agreement with models for the Bahamas and poor agreement for Bermuda is not understood, but needs further investigation in light of the probability of a higher sea level in the near future. |
format |
Text |
author |
Muhs, Daniel R Simmons, Kathleen R. Schumann, R. Randall Schweig, Eugene S. Rowe, Mark P. |
author_facet |
Muhs, Daniel R Simmons, Kathleen R. Schumann, R. Randall Schweig, Eugene S. Rowe, Mark P. |
author_sort |
Muhs, Daniel R |
title |
Testing glacial isostatic adjustment models of last-interglacial sea level history in the Bahamas and Bermuda |
title_short |
Testing glacial isostatic adjustment models of last-interglacial sea level history in the Bahamas and Bermuda |
title_full |
Testing glacial isostatic adjustment models of last-interglacial sea level history in the Bahamas and Bermuda |
title_fullStr |
Testing glacial isostatic adjustment models of last-interglacial sea level history in the Bahamas and Bermuda |
title_full_unstemmed |
Testing glacial isostatic adjustment models of last-interglacial sea level history in the Bahamas and Bermuda |
title_sort |
testing glacial isostatic adjustment models of last-interglacial sea level history in the bahamas and bermuda |
publisher |
DigitalCommons@University of Nebraska - Lincoln |
publishDate |
2020 |
url |
https://digitalcommons.unl.edu/usgsstaffpub/1268 https://digitalcommons.unl.edu/context/usgsstaffpub/article/2278/viewcontent/Muhs_QSR_2020_Testing_glacial_isostatic_adjustment_models.pdf |
genre |
Ice Sheet North Atlantic |
genre_facet |
Ice Sheet North Atlantic |
op_source |
USGS Staff -- Published Research |
op_relation |
https://digitalcommons.unl.edu/usgsstaffpub/1268 https://digitalcommons.unl.edu/context/usgsstaffpub/article/2278/viewcontent/Muhs_QSR_2020_Testing_glacial_isostatic_adjustment_models.pdf |
_version_ |
1782335406297055232 |