Alkenone ratios and temperature evolution at ODP Site 1168 during the Olgiocene to Early Miocene
Large Antarctic ice volume changes characterized the middle to Late Oligocene and the first million years of climate evolution during the Miocene. However, the sea surface temperature (SST) evolution over this period remains poorly constrained, as only a few records from contrasting proxies are avai...
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ftzenodo:oai:zenodo.org:5142099 2024-09-15T17:43:11+00:00 Alkenone ratios and temperature evolution at ODP Site 1168 during the Olgiocene to Early Miocene Jose Guitian Heather M Stoll 2021-07-28 https://doi.org/10.5281/zenodo.5142099 unknown Zenodo https://doi.org/10.5281/zenodo.5142098 https://doi.org/10.5281/zenodo.5142099 oai:zenodo.org:5142099 info:eu-repo/semantics/openAccess Creative Commons Attribution 4.0 International https://creativecommons.org/licenses/by/4.0/legalcode info:eu-repo/semantics/article 2021 ftzenodo https://doi.org/10.5281/zenodo.514209910.5281/zenodo.5142098 2024-07-26T02:51:12Z Large Antarctic ice volume changes characterized the middle to Late Oligocene and the first million years of climate evolution during the Miocene. However, the sea surface temperature (SST) evolution over this period remains poorly constrained, as only a few records from contrasting proxies are available. In this study, we present a long-term alkenone-derived SST record from sediments drilled by the Ocean Drilling Program (ODP) at Site 1168 in the west Tasmanian Sea spanning 29.8 Ma to 16.7 Ma. The SST record highlight that the long-term warming in the Late Oligocene linked to the end of the Middle Oligocene Glacial Interval can be recognized also at mid-to-high latitudes of the Southern Hemisphere. Warmer average temperatures (25.5°C) characterize the period from 24.6 to 22 Ma; average temperatures then decrease by 1 to 2°C into the Miocene and stabilize by 20.1 Ma. The reconstructed temperatures are highly variable in the warm Late Oligocene waters, and more stable and slightly colder in the Early to Middle Miocene. We confirm that this temperature trend is not an artefact of the latitudinal drift of the site, as the temperature anomaly relative to the modern water temperature at the paleolocation confirms the SST trends of the Oligocene. This is the first alkenone-derived continuous record to reproduce the long-term Oligocene climate trend previously interpreted from the benthic δ 18 O, which recorded a warming and/or reduction in ice volume from the Middle Oligocene Glacial Interval through the latest Oligocene. Article in Journal/Newspaper Antarc* Antarctic Zenodo |
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description |
Large Antarctic ice volume changes characterized the middle to Late Oligocene and the first million years of climate evolution during the Miocene. However, the sea surface temperature (SST) evolution over this period remains poorly constrained, as only a few records from contrasting proxies are available. In this study, we present a long-term alkenone-derived SST record from sediments drilled by the Ocean Drilling Program (ODP) at Site 1168 in the west Tasmanian Sea spanning 29.8 Ma to 16.7 Ma. The SST record highlight that the long-term warming in the Late Oligocene linked to the end of the Middle Oligocene Glacial Interval can be recognized also at mid-to-high latitudes of the Southern Hemisphere. Warmer average temperatures (25.5°C) characterize the period from 24.6 to 22 Ma; average temperatures then decrease by 1 to 2°C into the Miocene and stabilize by 20.1 Ma. The reconstructed temperatures are highly variable in the warm Late Oligocene waters, and more stable and slightly colder in the Early to Middle Miocene. We confirm that this temperature trend is not an artefact of the latitudinal drift of the site, as the temperature anomaly relative to the modern water temperature at the paleolocation confirms the SST trends of the Oligocene. This is the first alkenone-derived continuous record to reproduce the long-term Oligocene climate trend previously interpreted from the benthic δ 18 O, which recorded a warming and/or reduction in ice volume from the Middle Oligocene Glacial Interval through the latest Oligocene. |
format |
Article in Journal/Newspaper |
author |
Jose Guitian Heather M Stoll |
spellingShingle |
Jose Guitian Heather M Stoll Alkenone ratios and temperature evolution at ODP Site 1168 during the Olgiocene to Early Miocene |
author_facet |
Jose Guitian Heather M Stoll |
author_sort |
Jose Guitian |
title |
Alkenone ratios and temperature evolution at ODP Site 1168 during the Olgiocene to Early Miocene |
title_short |
Alkenone ratios and temperature evolution at ODP Site 1168 during the Olgiocene to Early Miocene |
title_full |
Alkenone ratios and temperature evolution at ODP Site 1168 during the Olgiocene to Early Miocene |
title_fullStr |
Alkenone ratios and temperature evolution at ODP Site 1168 during the Olgiocene to Early Miocene |
title_full_unstemmed |
Alkenone ratios and temperature evolution at ODP Site 1168 during the Olgiocene to Early Miocene |
title_sort |
alkenone ratios and temperature evolution at odp site 1168 during the olgiocene to early miocene |
publisher |
Zenodo |
publishDate |
2021 |
url |
https://doi.org/10.5281/zenodo.5142099 |
genre |
Antarc* Antarctic |
genre_facet |
Antarc* Antarctic |
op_relation |
https://doi.org/10.5281/zenodo.5142098 https://doi.org/10.5281/zenodo.5142099 oai:zenodo.org:5142099 |
op_rights |
info:eu-repo/semantics/openAccess Creative Commons Attribution 4.0 International https://creativecommons.org/licenses/by/4.0/legalcode |
op_doi |
https://doi.org/10.5281/zenodo.514209910.5281/zenodo.5142098 |
_version_ |
1810490048263487488 |