Higher than present global mean sea level recorded by an Early Pliocene intertidal unit in Patagonia (Argentina)
Reconstructions of global mean sea level from earlier warm periods in Earth’s history can help constrain future projections of sea level rise. Here we report on the sedimentology and age of a geological unit in central Patagonia, Argentina, that we dated to the Early Pliocene (4.69–5.23 Ma, 2σ) with...
Published in: | Communications Earth & Environment |
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Online Access: | http://hdl.handle.net/11568/1071167 https://doi.org/10.1038/s43247-020-00067-6 |
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ftunivpisairis:oai:arpi.unipi.it:11568/1071167 2023-11-12T04:03:08+01:00 Higher than present global mean sea level recorded by an Early Pliocene intertidal unit in Patagonia (Argentina) Alessio Rovere Marta Pappalardo Sebastian Richiano Marina Aguirre Michael R. Sandstrom Paul J. Hearty Jacqueline Austermann Ignacio Castellanos Maureen E. Raymo Rovere, Alessio Pappalardo, Marta Richiano, Sebastian Aguirre, Marina Sandstrom, Michael R. Hearty, Paul J. Austermann, Jacqueline Castellanos, Ignacio Raymo, Maureen E. 2020 http://hdl.handle.net/11568/1071167 https://doi.org/10.1038/s43247-020-00067-6 unknown volume:1 issue:1 journal:COMMUNICATIONS EARTH & ENVIRONMENT http://hdl.handle.net/11568/1071167 doi:10.1038/s43247-020-00067-6 info:eu-repo/semantics/article 2020 ftunivpisairis https://doi.org/10.1038/s43247-020-00067-6 2023-10-17T21:52:39Z Reconstructions of global mean sea level from earlier warm periods in Earth’s history can help constrain future projections of sea level rise. Here we report on the sedimentology and age of a geological unit in central Patagonia, Argentina, that we dated to the Early Pliocene (4.69–5.23 Ma, 2σ) with strontium isotope stratigraphy. The unit was interpreted as representative of an intertidal environment, and its elevation was measured with differential GPS at ca. 36 m above present-day sea level. Considering modern tidal ranges, it was possible to constrain paleo relative sea level within ±2.7 m (1σ). We use glacial isostatic adjustment models and estimates of vertical land movement to calculate that, when the Camarones intertidal sequence was deposited, global mean sea level was 28.4 ± 11.7 m (1σ) above present. This estimate matches those derived from analogous Early Pliocene sea level proxies in the Mediterranean Sea and South Africa. Evidence from these three locations indicates that Early Pliocene sea level may have exceeded 20m above its present level. Such high global mean sea level values imply an ice-free Greenland, a significant melting of West Antarctica, and a contribution of marine-based sectors of East Antarctica to global mean sea level. Article in Journal/Newspaper Antarc* Antarctica East Antarctica Greenland West Antarctica ARPI - Archivio della Ricerca dell'Università di Pisa Argentina East Antarctica Greenland Patagonia West Antarctica Communications Earth & Environment 1 1 |
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Open Polar |
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ARPI - Archivio della Ricerca dell'Università di Pisa |
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ftunivpisairis |
language |
unknown |
description |
Reconstructions of global mean sea level from earlier warm periods in Earth’s history can help constrain future projections of sea level rise. Here we report on the sedimentology and age of a geological unit in central Patagonia, Argentina, that we dated to the Early Pliocene (4.69–5.23 Ma, 2σ) with strontium isotope stratigraphy. The unit was interpreted as representative of an intertidal environment, and its elevation was measured with differential GPS at ca. 36 m above present-day sea level. Considering modern tidal ranges, it was possible to constrain paleo relative sea level within ±2.7 m (1σ). We use glacial isostatic adjustment models and estimates of vertical land movement to calculate that, when the Camarones intertidal sequence was deposited, global mean sea level was 28.4 ± 11.7 m (1σ) above present. This estimate matches those derived from analogous Early Pliocene sea level proxies in the Mediterranean Sea and South Africa. Evidence from these three locations indicates that Early Pliocene sea level may have exceeded 20m above its present level. Such high global mean sea level values imply an ice-free Greenland, a significant melting of West Antarctica, and a contribution of marine-based sectors of East Antarctica to global mean sea level. |
author2 |
Rovere, Alessio Pappalardo, Marta Richiano, Sebastian Aguirre, Marina Sandstrom, Michael R. Hearty, Paul J. Austermann, Jacqueline Castellanos, Ignacio Raymo, Maureen E. |
format |
Article in Journal/Newspaper |
author |
Alessio Rovere Marta Pappalardo Sebastian Richiano Marina Aguirre Michael R. Sandstrom Paul J. Hearty Jacqueline Austermann Ignacio Castellanos Maureen E. Raymo |
spellingShingle |
Alessio Rovere Marta Pappalardo Sebastian Richiano Marina Aguirre Michael R. Sandstrom Paul J. Hearty Jacqueline Austermann Ignacio Castellanos Maureen E. Raymo Higher than present global mean sea level recorded by an Early Pliocene intertidal unit in Patagonia (Argentina) |
author_facet |
Alessio Rovere Marta Pappalardo Sebastian Richiano Marina Aguirre Michael R. Sandstrom Paul J. Hearty Jacqueline Austermann Ignacio Castellanos Maureen E. Raymo |
author_sort |
Alessio Rovere |
title |
Higher than present global mean sea level recorded by an Early Pliocene intertidal unit in Patagonia (Argentina) |
title_short |
Higher than present global mean sea level recorded by an Early Pliocene intertidal unit in Patagonia (Argentina) |
title_full |
Higher than present global mean sea level recorded by an Early Pliocene intertidal unit in Patagonia (Argentina) |
title_fullStr |
Higher than present global mean sea level recorded by an Early Pliocene intertidal unit in Patagonia (Argentina) |
title_full_unstemmed |
Higher than present global mean sea level recorded by an Early Pliocene intertidal unit in Patagonia (Argentina) |
title_sort |
higher than present global mean sea level recorded by an early pliocene intertidal unit in patagonia (argentina) |
publishDate |
2020 |
url |
http://hdl.handle.net/11568/1071167 https://doi.org/10.1038/s43247-020-00067-6 |
geographic |
Argentina East Antarctica Greenland Patagonia West Antarctica |
geographic_facet |
Argentina East Antarctica Greenland Patagonia West Antarctica |
genre |
Antarc* Antarctica East Antarctica Greenland West Antarctica |
genre_facet |
Antarc* Antarctica East Antarctica Greenland West Antarctica |
op_relation |
volume:1 issue:1 journal:COMMUNICATIONS EARTH & ENVIRONMENT http://hdl.handle.net/11568/1071167 doi:10.1038/s43247-020-00067-6 |
op_doi |
https://doi.org/10.1038/s43247-020-00067-6 |
container_title |
Communications Earth & Environment |
container_volume |
1 |
container_issue |
1 |
_version_ |
1782336257304559616 |