Paleoceanography and ice sheet variability offshore Wilkes Land, Antarctica – Part 3: Insights from Oligocene–Miocene TEX86-based sea surface temperature reconstructions
The volume of the Antarctic continental ice sheet(s) varied substantially during the Oligocene and Miocene (∼34–5 Ma) from smaller to substantially larger than today, both on million-year and on orbital timescales. However, reproduction through physical modeling of a dynamic response of the ice shee...
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fttriple:oai:gotriple.eu:BWMfue8ZHsRmuDpQG6euo 2023-05-15T13:50:25+02:00 Paleoceanography and ice sheet variability offshore Wilkes Land, Antarctica – Part 3: Insights from Oligocene–Miocene TEX86-based sea surface temperature reconstructions Hartman, Julian D. Sangiorgi, Francesca Salabarnada, Ariadna Peterse, Francien Houben, Alexander J. P. Schouten, Stefan Brinkhuis, Henk Escutia, Carlota Bijl, Peter K. 2019-01-29 https://doi.org/10.5194/cp-14-1275-2018 https://cp.copernicus.org/articles/14/1275/2018/ en eng doi:10.5194/cp-14-1275-2018 10670/1.zo1vci https://cp.copernicus.org/articles/14/1275/2018/ undefined Geographica Helvetica - geography eISSN: 1814-9332 geo envir Text https://vocabularies.coar-repositories.org/resource_types/c_18cf/ 2019 fttriple https://doi.org/10.5194/cp-14-1275-2018 2023-01-22T17:39:41Z The volume of the Antarctic continental ice sheet(s) varied substantially during the Oligocene and Miocene (∼34–5 Ma) from smaller to substantially larger than today, both on million-year and on orbital timescales. However, reproduction through physical modeling of a dynamic response of the ice sheets to climate forcing remains problematic, suggesting the existence of complex feedback mechanisms between the cryosphere, ocean, and atmosphere systems. There is therefore an urgent need to improve the models for better predictions of these systems, including resulting potential future sea level change. To assess the interactions between the cryosphere, ocean, and atmosphere, knowledge of ancient sea surface conditions close to the Antarctic margin is essential. Here, we present a new TEX86-based sea surface water paleotemperature record measured on Oligocene sediments from Integrated Ocean Drilling Program (IODP) Site U1356, offshore Wilkes Land, East Antarctica. The new data are presented along with previously published Miocene temperatures from the same site. Together the data cover the interval between ∼34 and ∼11 Ma and encompasses two hiatuses. This record allows us to accurately reconstruct the magnitude of sea surface temperature (SST) variability and trends on both million-year and glacial–interglacial timescales. On average, TEX86 values indicate SSTs ranging between 10 and 21 ∘C during the Oligocene and Miocene, which is on the upper end of the few existing reconstructions from other high-latitude Southern Ocean sites. SST maxima occur around 30.5, 25, and 17 Ma. Our record suggests generally warm to temperate ocean offshore Wilkes Land. Based on lithological alternations detected in the sedimentary record, which are assigned to glacial–interglacial deposits, a SST variability of 1.5–3.1 ∘C at glacial–interglacial timescales can be established. This variability is slightly larger than that of deep-sea temperatures recorded in Mg ∕ Ca data. Our reconstructed Oligocene temperature variability has ... Text Antarc* Antarctic Antarctica East Antarctica Ice Sheet Southern Ocean Wilkes Land Unknown Antarctic East Antarctica Southern Ocean The Antarctic Wilkes Land ENVELOPE(120.000,120.000,-69.000,-69.000) Climate of the Past 14 9 1275 1297 |
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English |
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geo envir Hartman, Julian D. Sangiorgi, Francesca Salabarnada, Ariadna Peterse, Francien Houben, Alexander J. P. Schouten, Stefan Brinkhuis, Henk Escutia, Carlota Bijl, Peter K. Paleoceanography and ice sheet variability offshore Wilkes Land, Antarctica – Part 3: Insights from Oligocene–Miocene TEX86-based sea surface temperature reconstructions |
topic_facet |
geo envir |
description |
The volume of the Antarctic continental ice sheet(s) varied substantially during the Oligocene and Miocene (∼34–5 Ma) from smaller to substantially larger than today, both on million-year and on orbital timescales. However, reproduction through physical modeling of a dynamic response of the ice sheets to climate forcing remains problematic, suggesting the existence of complex feedback mechanisms between the cryosphere, ocean, and atmosphere systems. There is therefore an urgent need to improve the models for better predictions of these systems, including resulting potential future sea level change. To assess the interactions between the cryosphere, ocean, and atmosphere, knowledge of ancient sea surface conditions close to the Antarctic margin is essential. Here, we present a new TEX86-based sea surface water paleotemperature record measured on Oligocene sediments from Integrated Ocean Drilling Program (IODP) Site U1356, offshore Wilkes Land, East Antarctica. The new data are presented along with previously published Miocene temperatures from the same site. Together the data cover the interval between ∼34 and ∼11 Ma and encompasses two hiatuses. This record allows us to accurately reconstruct the magnitude of sea surface temperature (SST) variability and trends on both million-year and glacial–interglacial timescales. On average, TEX86 values indicate SSTs ranging between 10 and 21 ∘C during the Oligocene and Miocene, which is on the upper end of the few existing reconstructions from other high-latitude Southern Ocean sites. SST maxima occur around 30.5, 25, and 17 Ma. Our record suggests generally warm to temperate ocean offshore Wilkes Land. Based on lithological alternations detected in the sedimentary record, which are assigned to glacial–interglacial deposits, a SST variability of 1.5–3.1 ∘C at glacial–interglacial timescales can be established. This variability is slightly larger than that of deep-sea temperatures recorded in Mg ∕ Ca data. Our reconstructed Oligocene temperature variability has ... |
format |
Text |
author |
Hartman, Julian D. Sangiorgi, Francesca Salabarnada, Ariadna Peterse, Francien Houben, Alexander J. P. Schouten, Stefan Brinkhuis, Henk Escutia, Carlota Bijl, Peter K. |
author_facet |
Hartman, Julian D. Sangiorgi, Francesca Salabarnada, Ariadna Peterse, Francien Houben, Alexander J. P. Schouten, Stefan Brinkhuis, Henk Escutia, Carlota Bijl, Peter K. |
author_sort |
Hartman, Julian D. |
title |
Paleoceanography and ice sheet variability offshore Wilkes Land, Antarctica – Part 3: Insights from Oligocene–Miocene TEX86-based sea surface temperature reconstructions |
title_short |
Paleoceanography and ice sheet variability offshore Wilkes Land, Antarctica – Part 3: Insights from Oligocene–Miocene TEX86-based sea surface temperature reconstructions |
title_full |
Paleoceanography and ice sheet variability offshore Wilkes Land, Antarctica – Part 3: Insights from Oligocene–Miocene TEX86-based sea surface temperature reconstructions |
title_fullStr |
Paleoceanography and ice sheet variability offshore Wilkes Land, Antarctica – Part 3: Insights from Oligocene–Miocene TEX86-based sea surface temperature reconstructions |
title_full_unstemmed |
Paleoceanography and ice sheet variability offshore Wilkes Land, Antarctica – Part 3: Insights from Oligocene–Miocene TEX86-based sea surface temperature reconstructions |
title_sort |
paleoceanography and ice sheet variability offshore wilkes land, antarctica – part 3: insights from oligocene–miocene tex86-based sea surface temperature reconstructions |
publishDate |
2019 |
url |
https://doi.org/10.5194/cp-14-1275-2018 https://cp.copernicus.org/articles/14/1275/2018/ |
long_lat |
ENVELOPE(120.000,120.000,-69.000,-69.000) |
geographic |
Antarctic East Antarctica Southern Ocean The Antarctic Wilkes Land |
geographic_facet |
Antarctic East Antarctica Southern Ocean The Antarctic Wilkes Land |
genre |
Antarc* Antarctic Antarctica East Antarctica Ice Sheet Southern Ocean Wilkes Land |
genre_facet |
Antarc* Antarctic Antarctica East Antarctica Ice Sheet Southern Ocean Wilkes Land |
op_source |
Geographica Helvetica - geography eISSN: 1814-9332 |
op_relation |
doi:10.5194/cp-14-1275-2018 10670/1.zo1vci https://cp.copernicus.org/articles/14/1275/2018/ |
op_rights |
undefined |
op_doi |
https://doi.org/10.5194/cp-14-1275-2018 |
container_title |
Climate of the Past |
container_volume |
14 |
container_issue |
9 |
container_start_page |
1275 |
op_container_end_page |
1297 |
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1766253483519901696 |