Can ice cores reveal past events of East Antarctic ice sheet retreat?
Ice cores drilled in near-coastal areas of Antarctica could potentially record past margin retreats during previous interglacial periods. The chronology of the TALDICE ice core (159°11’ E, 72°49’S, 2315m a.s.l), drilled in a peripheral area of the East Antarctic Plateau, has recently been extended b...
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ftuniveneziairis:oai:iris.unive.it:10278/5036203 2024-02-04T09:54:36+01:00 Can ice cores reveal past events of East Antarctic ice sheet retreat? Ilaria Crotti Barbara Stenni Amaelle Landais Aurélien Quiquet Massimo Frezzotti David Wilson Mirko Severi Carlo Barbante Crotti, Ilaria Stenni, Barbara Landais, Amaelle Quiquet, Aurélien Frezzotti, Massimo Wilson, David Severi, Mirko Barbante, Carlo 2023 https://hdl.handle.net/10278/5036203 https://instant2023.org/conference-programme-2/ eng eng INSTANT2023 ispartofbook:INSTANT2023 - Book of Abstract - INSTABILITIES AND THRESHOLDS IN ANTARCTICA Contribution of Antarctica to past, present and future sea level rise INSTANT2023 - Instabilities and thresholds in Antarctica firstpage:75 lastpage:75 numberofpages:1 https://hdl.handle.net/10278/5036203 https://instant2023.org/conference-programme-2/ Settore GEO/08 - Geochimica e Vulcanologia info:eu-repo/semantics/conferenceObject 2023 ftuniveneziairis 2024-01-10T17:45:46Z Ice cores drilled in near-coastal areas of Antarctica could potentially record past margin retreats during previous interglacial periods. The chronology of the TALDICE ice core (159°11’ E, 72°49’S, 2315m a.s.l), drilled in a peripheral area of the East Antarctic Plateau, has recently been extended back to 343,000 years BP (Crotti et al., 2021). The high-resolution isotopic records contained in the deeper and strongly-thinned sections of this ice core reveal unique double-peak features during the late Pleistocene interglacials MIS 7.5 and 9.3, as previously observed for MIS 5.5 in the same core (Masson-Delmotte et al., 2011) and not present in the inland ice core records. Through a combination of glaciological evidence, an offshore Wilkes Subglacial Basin sediment core record (Wilson et al., 2018), and GRISLI ice sheet modelling experiments (Quiquet et al., 2018), we provide an interpretation of this peculiar record. Our results indicate that the interglacial double-peak δ18Oice signal could reflect Talos Dome site elevation decreases during the late stages of interglacials due to ice retreat in the Wilkes Subglacial Basin. These changes coincided with warmer Southern Ocean temperatures and elevated global mean sea level, confirming the sensitivity of the Wilkes Subglacial Basin ice sheet to ocean warming and its potential contribution to sea-level change. References: Crotti, I. et al. An extension of the TALDICE ice core age scale reaching back to MIS 10.1.Quat. Sci. Rev. 266, 107078 (2021). Masson Delmotte, V. et al. A comparison of the present and last interglacial periods in six Antarctic ice cores. Clim 7, 397–423 (2011). Quiquet, A., et al. The GRISLI ice sheet model (version 2. 0): calibration and validation for multi-millennial changes of the Antarctic ice sheet. Geosci. Model Dev. 11, 5003–5025 (2018). Wilson, D. J. et al. Ice loss from the East Antarctic Ice Sheet during late Pleistocene interglacials. Nature 561, 383–386 (2018). Conference Object Antarc* Antarctic Antarctica ice core Ice Sheet Southern Ocean Università Ca’ Foscari Venezia: ARCA (Archivio Istituzionale della Ricerca) Antarctic Southern Ocean The Antarctic East Antarctic Ice Sheet Talos Dome ENVELOPE(158.000,158.000,-73.000,-73.000) Wilkes Subglacial Basin ENVELOPE(145.000,145.000,-75.000,-75.000) |
institution |
Open Polar |
collection |
Università Ca’ Foscari Venezia: ARCA (Archivio Istituzionale della Ricerca) |
op_collection_id |
ftuniveneziairis |
language |
English |
topic |
Settore GEO/08 - Geochimica e Vulcanologia |
spellingShingle |
Settore GEO/08 - Geochimica e Vulcanologia Ilaria Crotti Barbara Stenni Amaelle Landais Aurélien Quiquet Massimo Frezzotti David Wilson Mirko Severi Carlo Barbante Can ice cores reveal past events of East Antarctic ice sheet retreat? |
topic_facet |
Settore GEO/08 - Geochimica e Vulcanologia |
description |
Ice cores drilled in near-coastal areas of Antarctica could potentially record past margin retreats during previous interglacial periods. The chronology of the TALDICE ice core (159°11’ E, 72°49’S, 2315m a.s.l), drilled in a peripheral area of the East Antarctic Plateau, has recently been extended back to 343,000 years BP (Crotti et al., 2021). The high-resolution isotopic records contained in the deeper and strongly-thinned sections of this ice core reveal unique double-peak features during the late Pleistocene interglacials MIS 7.5 and 9.3, as previously observed for MIS 5.5 in the same core (Masson-Delmotte et al., 2011) and not present in the inland ice core records. Through a combination of glaciological evidence, an offshore Wilkes Subglacial Basin sediment core record (Wilson et al., 2018), and GRISLI ice sheet modelling experiments (Quiquet et al., 2018), we provide an interpretation of this peculiar record. Our results indicate that the interglacial double-peak δ18Oice signal could reflect Talos Dome site elevation decreases during the late stages of interglacials due to ice retreat in the Wilkes Subglacial Basin. These changes coincided with warmer Southern Ocean temperatures and elevated global mean sea level, confirming the sensitivity of the Wilkes Subglacial Basin ice sheet to ocean warming and its potential contribution to sea-level change. References: Crotti, I. et al. An extension of the TALDICE ice core age scale reaching back to MIS 10.1.Quat. Sci. Rev. 266, 107078 (2021). Masson Delmotte, V. et al. A comparison of the present and last interglacial periods in six Antarctic ice cores. Clim 7, 397–423 (2011). Quiquet, A., et al. The GRISLI ice sheet model (version 2. 0): calibration and validation for multi-millennial changes of the Antarctic ice sheet. Geosci. Model Dev. 11, 5003–5025 (2018). Wilson, D. J. et al. Ice loss from the East Antarctic Ice Sheet during late Pleistocene interglacials. Nature 561, 383–386 (2018). |
author2 |
Crotti, Ilaria Stenni, Barbara Landais, Amaelle Quiquet, Aurélien Frezzotti, Massimo Wilson, David Severi, Mirko Barbante, Carlo |
format |
Conference Object |
author |
Ilaria Crotti Barbara Stenni Amaelle Landais Aurélien Quiquet Massimo Frezzotti David Wilson Mirko Severi Carlo Barbante |
author_facet |
Ilaria Crotti Barbara Stenni Amaelle Landais Aurélien Quiquet Massimo Frezzotti David Wilson Mirko Severi Carlo Barbante |
author_sort |
Ilaria Crotti |
title |
Can ice cores reveal past events of East Antarctic ice sheet retreat? |
title_short |
Can ice cores reveal past events of East Antarctic ice sheet retreat? |
title_full |
Can ice cores reveal past events of East Antarctic ice sheet retreat? |
title_fullStr |
Can ice cores reveal past events of East Antarctic ice sheet retreat? |
title_full_unstemmed |
Can ice cores reveal past events of East Antarctic ice sheet retreat? |
title_sort |
can ice cores reveal past events of east antarctic ice sheet retreat? |
publisher |
INSTANT2023 |
publishDate |
2023 |
url |
https://hdl.handle.net/10278/5036203 https://instant2023.org/conference-programme-2/ |
long_lat |
ENVELOPE(158.000,158.000,-73.000,-73.000) ENVELOPE(145.000,145.000,-75.000,-75.000) |
geographic |
Antarctic Southern Ocean The Antarctic East Antarctic Ice Sheet Talos Dome Wilkes Subglacial Basin |
geographic_facet |
Antarctic Southern Ocean The Antarctic East Antarctic Ice Sheet Talos Dome Wilkes Subglacial Basin |
genre |
Antarc* Antarctic Antarctica ice core Ice Sheet Southern Ocean |
genre_facet |
Antarc* Antarctic Antarctica ice core Ice Sheet Southern Ocean |
op_relation |
ispartofbook:INSTANT2023 - Book of Abstract - INSTABILITIES AND THRESHOLDS IN ANTARCTICA Contribution of Antarctica to past, present and future sea level rise INSTANT2023 - Instabilities and thresholds in Antarctica firstpage:75 lastpage:75 numberofpages:1 https://hdl.handle.net/10278/5036203 https://instant2023.org/conference-programme-2/ |
_version_ |
1789974561614200832 |