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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2018
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article Verlagsveröffentlichung 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 |
article Verlagsveröffentlichung |
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 implications for Oligocene ice volume estimates based on benthic δ18O records. If the long-term and orbital-scale SST variability at Site U1356 mirrors that of the nearby region of deep-water formation, we argue that a substantial portion of the variability and trends contained in long-term δ18O records can be explained by variability in Southern high-latitude temperature and that the Antarctic ice volume may have been less dynamic than previously thought. Importantly, our temperature record suggests that Oligocene–Miocene Antarctic ice sheets were generally of smaller size compared to today. |
format |
Article in Journal/Newspaper |
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 |
publisher |
Copernicus Publications |
publishDate |
2018 |
url |
https://doi.org/10.5194/cp-14-1275-2018 https://noa.gwlb.de/receive/cop_mods_00004948 https://noa.gwlb.de/servlets/MCRFileNodeServlet/cop_derivate_00004905/cp-14-1275-2018.pdf https://cp.copernicus.org/articles/14/1275/2018/cp-14-1275-2018.pdf |
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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 |
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Climate of the Past -- http://www.copernicus.org/EGU/cp/cp/published_papers.html -- http://www.bibliothek.uni-regensburg.de/ezeit/?2217985 -- 1814-9332 https://doi.org/10.5194/cp-14-1275-2018 https://noa.gwlb.de/receive/cop_mods_00004948 https://noa.gwlb.de/servlets/MCRFileNodeServlet/cop_derivate_00004905/cp-14-1275-2018.pdf https://cp.copernicus.org/articles/14/1275/2018/cp-14-1275-2018.pdf |
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https://creativecommons.org/licenses/by/4.0/ uneingeschränkt info:eu-repo/semantics/openAccess |
op_rightsnorm |
CC-BY |
op_doi |
https://doi.org/10.5194/cp-14-1275-2018 |
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Climate of the Past |
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14 |
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1297 |
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ftnonlinearchiv:oai:noa.gwlb.de:cop_mods_00004948 2023-05-15T13:34:49+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. 2018-09 electronic https://doi.org/10.5194/cp-14-1275-2018 https://noa.gwlb.de/receive/cop_mods_00004948 https://noa.gwlb.de/servlets/MCRFileNodeServlet/cop_derivate_00004905/cp-14-1275-2018.pdf https://cp.copernicus.org/articles/14/1275/2018/cp-14-1275-2018.pdf eng eng Copernicus Publications Climate of the Past -- http://www.copernicus.org/EGU/cp/cp/published_papers.html -- http://www.bibliothek.uni-regensburg.de/ezeit/?2217985 -- 1814-9332 https://doi.org/10.5194/cp-14-1275-2018 https://noa.gwlb.de/receive/cop_mods_00004948 https://noa.gwlb.de/servlets/MCRFileNodeServlet/cop_derivate_00004905/cp-14-1275-2018.pdf https://cp.copernicus.org/articles/14/1275/2018/cp-14-1275-2018.pdf https://creativecommons.org/licenses/by/4.0/ uneingeschränkt info:eu-repo/semantics/openAccess CC-BY article Verlagsveröffentlichung article Text doc-type:article 2018 ftnonlinearchiv https://doi.org/10.5194/cp-14-1275-2018 2022-02-08T22:59:51Z 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 implications for Oligocene ice volume estimates based on benthic δ18O records. If the long-term and orbital-scale SST variability at Site U1356 mirrors that of the nearby region of deep-water formation, we argue that a substantial portion of the variability and trends contained in long-term δ18O records can be explained by variability in Southern high-latitude temperature and that the Antarctic ice volume may have been less dynamic than previously thought. Importantly, our temperature record suggests that Oligocene–Miocene Antarctic ice sheets were generally of smaller size compared to today. Article in Journal/Newspaper Antarc* Antarctic Antarctica East Antarctica Ice Sheet Southern Ocean Wilkes Land Niedersächsisches Online-Archiv NOA 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 |