Evolution of mean ocean temperature in Marine Isotope Stage 4
Deglaciations are characterized by relatively fast and near-synchronous changes in ice sheet volume, ocean temperature, and atmospheric greenhouse gas concentrations, but glacial inception occurs more gradually. Understanding the evolution of ice sheet, ocean, and atmosphere conditions from intergla...
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ftcopernicus:oai:publications.copernicus.org:cp92540 2023-05-15T14:02:17+02:00 Evolution of mean ocean temperature in Marine Isotope Stage 4 Shackleton, Sarah Menking, James A. Brook, Edward Buizert, Christo Dyonisius, Michael N. Petrenko, Vasilii V. Baggenstos, Daniel Severinghaus, Jeffrey P. 2021-10-27 application/pdf https://doi.org/10.5194/cp-17-2273-2021 https://cp.copernicus.org/articles/17/2273/2021/ eng eng doi:10.5194/cp-17-2273-2021 https://cp.copernicus.org/articles/17/2273/2021/ eISSN: 1814-9332 Text 2021 ftcopernicus https://doi.org/10.5194/cp-17-2273-2021 2021-11-01T17:22:28Z Deglaciations are characterized by relatively fast and near-synchronous changes in ice sheet volume, ocean temperature, and atmospheric greenhouse gas concentrations, but glacial inception occurs more gradually. Understanding the evolution of ice sheet, ocean, and atmosphere conditions from interglacial to glacial maximum provides insight into the interplay of these components of the climate system. Using noble gas measurements in ancient ice samples, we reconstruct mean ocean temperature (MOT) from 74 to 59.7 ka, covering the Marine Isotope Stage (MIS) 5a–4 boundary, MIS 4, and part of the MIS 4–3 transition. Comparing this MOT reconstruction to previously published MOT reconstructions from the last and penultimate deglaciation, we find that the majority of the last interglacial–glacial ocean cooling must have occurred within MIS 5. MOT reached equally cold conditions in MIS 4 as in MIS 2 ( −2.7 ± 0.3 ∘ C relative to the Holocene, −0.1 ± 0.3 ∘ C relative to MIS 2). Using a carbon cycle model to quantify the CO 2 solubility pump, we show that ocean cooling can explain most of the CO 2 drawdown (32 ± 4 of 40 ppm) across MIS 5. Comparing MOT to contemporaneous records of benthic δ 18 O, we find that ocean cooling can also explain the majority of the δ 18 O increase across MIS 5 (0.7 ‰ of 1.3 ‰). The timing of ocean warming and cooling in the record and the comparison to coeval Antarctic isotope data suggest an intimate link between ocean heat content, Southern Hemisphere high-latitude climate, and ocean circulation on orbital and millennial timescales. Text Antarc* Antarctic Ice Sheet Copernicus Publications: E-Journals Antarctic Climate of the Past 17 5 2273 2289 |
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Copernicus Publications: E-Journals |
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English |
description |
Deglaciations are characterized by relatively fast and near-synchronous changes in ice sheet volume, ocean temperature, and atmospheric greenhouse gas concentrations, but glacial inception occurs more gradually. Understanding the evolution of ice sheet, ocean, and atmosphere conditions from interglacial to glacial maximum provides insight into the interplay of these components of the climate system. Using noble gas measurements in ancient ice samples, we reconstruct mean ocean temperature (MOT) from 74 to 59.7 ka, covering the Marine Isotope Stage (MIS) 5a–4 boundary, MIS 4, and part of the MIS 4–3 transition. Comparing this MOT reconstruction to previously published MOT reconstructions from the last and penultimate deglaciation, we find that the majority of the last interglacial–glacial ocean cooling must have occurred within MIS 5. MOT reached equally cold conditions in MIS 4 as in MIS 2 ( −2.7 ± 0.3 ∘ C relative to the Holocene, −0.1 ± 0.3 ∘ C relative to MIS 2). Using a carbon cycle model to quantify the CO 2 solubility pump, we show that ocean cooling can explain most of the CO 2 drawdown (32 ± 4 of 40 ppm) across MIS 5. Comparing MOT to contemporaneous records of benthic δ 18 O, we find that ocean cooling can also explain the majority of the δ 18 O increase across MIS 5 (0.7 ‰ of 1.3 ‰). The timing of ocean warming and cooling in the record and the comparison to coeval Antarctic isotope data suggest an intimate link between ocean heat content, Southern Hemisphere high-latitude climate, and ocean circulation on orbital and millennial timescales. |
format |
Text |
author |
Shackleton, Sarah Menking, James A. Brook, Edward Buizert, Christo Dyonisius, Michael N. Petrenko, Vasilii V. Baggenstos, Daniel Severinghaus, Jeffrey P. |
spellingShingle |
Shackleton, Sarah Menking, James A. Brook, Edward Buizert, Christo Dyonisius, Michael N. Petrenko, Vasilii V. Baggenstos, Daniel Severinghaus, Jeffrey P. Evolution of mean ocean temperature in Marine Isotope Stage 4 |
author_facet |
Shackleton, Sarah Menking, James A. Brook, Edward Buizert, Christo Dyonisius, Michael N. Petrenko, Vasilii V. Baggenstos, Daniel Severinghaus, Jeffrey P. |
author_sort |
Shackleton, Sarah |
title |
Evolution of mean ocean temperature in Marine Isotope Stage 4 |
title_short |
Evolution of mean ocean temperature in Marine Isotope Stage 4 |
title_full |
Evolution of mean ocean temperature in Marine Isotope Stage 4 |
title_fullStr |
Evolution of mean ocean temperature in Marine Isotope Stage 4 |
title_full_unstemmed |
Evolution of mean ocean temperature in Marine Isotope Stage 4 |
title_sort |
evolution of mean ocean temperature in marine isotope stage 4 |
publishDate |
2021 |
url |
https://doi.org/10.5194/cp-17-2273-2021 https://cp.copernicus.org/articles/17/2273/2021/ |
geographic |
Antarctic |
geographic_facet |
Antarctic |
genre |
Antarc* Antarctic Ice Sheet |
genre_facet |
Antarc* Antarctic Ice Sheet |
op_source |
eISSN: 1814-9332 |
op_relation |
doi:10.5194/cp-17-2273-2021 https://cp.copernicus.org/articles/17/2273/2021/ |
op_doi |
https://doi.org/10.5194/cp-17-2273-2021 |
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Climate of the Past |
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17 |
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5 |
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2273 |
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2289 |
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