Ocean as the main driver of Antarctic ice sheet retreat during the Holocene
Ocean-driven basal melting has been shown to be the main ablation process responsible for the recession of many Antarctic ice shelves and marine-terminating glaciers over the last decades. However, much less is known about the drivers of ice shelf melt prior to the short instrumental era. Based on d...
Published in: | Global and Planetary Change |
---|---|
Main Authors: | , , , , , , , , , , |
Other Authors: | |
Format: | Article in Journal/Newspaper |
Language: | English |
Published: |
Elsevier BV
2018
|
Subjects: | |
Online Access: | http://hdl.handle.net/2078.1/224512 https://doi.org/10.1016/j.gloplacha.2018.04.007 |
id |
ftunivlouvain:oai:dial.uclouvain.be:boreal:224512 |
---|---|
record_format |
openpolar |
spelling |
ftunivlouvain:oai:dial.uclouvain.be:boreal:224512 2024-05-12T07:56:40+00:00 Ocean as the main driver of Antarctic ice sheet retreat during the Holocene Crosta, Xavier Crespin, Julien Swingedouw, Didier Marti, Olivier Masson-Delmotte, Valérie Etourneau, Johan Goosse, Hugues Braconnot, Pascale Yam, Ruth Brailovski, Irena Shemesh, Aldo UCL - SST/ELI/ELIC - Earth & Climate 2018 http://hdl.handle.net/2078.1/224512 https://doi.org/10.1016/j.gloplacha.2018.04.007 eng eng Elsevier BV boreal:224512 http://hdl.handle.net/2078.1/224512 doi:10.1016/j.gloplacha.2018.04.007 urn:ISSN:0921-8181 urn:EISSN:1872-6364 info:eu-repo/semantics/openAccess Global and Planetary Change, Vol. 166, p. 62-74 (2018) Global and Planetary Change Oceanography info:eu-repo/semantics/article 2018 ftunivlouvain https://doi.org/10.1016/j.gloplacha.2018.04.007 2024-04-17T16:46:26Z Ocean-driven basal melting has been shown to be the main ablation process responsible for the recession of many Antarctic ice shelves and marine-terminating glaciers over the last decades. However, much less is known about the drivers of ice shelf melt prior to the short instrumental era. Based on diatom oxygen isotope (δ18Odiatom; a proxy for glacial ice discharge in solid or liquid form) records from western Antarctic Peninsula (West Antarctica) and Adélie Land (East Antarctica), higher ocean temperatures were suggested to have been the main driver of enhanced ice melt during the Early-to-Mid Holocene while atmosphere temperatures were proposed to have been the main driver during the Late Holocene. Here, we present a new Holocene δ18Odiatom record from Prydz Bay, East Antarctica, also suggesting an increase in glacial ice discharge since ~4500 years before present (~4.5 kyr BP) as previously observed in Antarctic Peninsula and Adélie Land. Similar results from three different regions around Antarctica thus suggest common driving mechanisms. Combining marine and ice core records along with new transient accelerated simulations from the IPSL-CM5A-LR climate model, we rule out changes in air temperatures during the last ~4.5 kyr as the main driver of enhanced glacial ice discharge. Conversely, our simulations evidence the potential for significant warmer subsurface waters in the Southern Ocean during the last 6 kyr in response to enhanced summer insolation south of 60°S and enhanced upwelling of Circumpolar Deep Water towards the Antarctic shelf. We conclude that ice front and basal melting may have played a dominant role in glacial discharge during the Late Holocene. Article in Journal/Newspaper Antarc* Antarctic Antarctic Peninsula Antarctica East Antarctica ice core Ice Sheet Ice Shelf Ice Shelves Prydz Bay Southern Ocean West Antarctica DIAL@UCLouvain (Université catholique de Louvain) Antarctic Antarctic Peninsula East Antarctica Prydz Bay Southern Ocean The Antarctic West Antarctica Global and Planetary Change 166 62 74 |
institution |
Open Polar |
collection |
DIAL@UCLouvain (Université catholique de Louvain) |
op_collection_id |
ftunivlouvain |
language |
English |
topic |
Global and Planetary Change Oceanography |
spellingShingle |
Global and Planetary Change Oceanography Crosta, Xavier Crespin, Julien Swingedouw, Didier Marti, Olivier Masson-Delmotte, Valérie Etourneau, Johan Goosse, Hugues Braconnot, Pascale Yam, Ruth Brailovski, Irena Shemesh, Aldo Ocean as the main driver of Antarctic ice sheet retreat during the Holocene |
topic_facet |
Global and Planetary Change Oceanography |
description |
Ocean-driven basal melting has been shown to be the main ablation process responsible for the recession of many Antarctic ice shelves and marine-terminating glaciers over the last decades. However, much less is known about the drivers of ice shelf melt prior to the short instrumental era. Based on diatom oxygen isotope (δ18Odiatom; a proxy for glacial ice discharge in solid or liquid form) records from western Antarctic Peninsula (West Antarctica) and Adélie Land (East Antarctica), higher ocean temperatures were suggested to have been the main driver of enhanced ice melt during the Early-to-Mid Holocene while atmosphere temperatures were proposed to have been the main driver during the Late Holocene. Here, we present a new Holocene δ18Odiatom record from Prydz Bay, East Antarctica, also suggesting an increase in glacial ice discharge since ~4500 years before present (~4.5 kyr BP) as previously observed in Antarctic Peninsula and Adélie Land. Similar results from three different regions around Antarctica thus suggest common driving mechanisms. Combining marine and ice core records along with new transient accelerated simulations from the IPSL-CM5A-LR climate model, we rule out changes in air temperatures during the last ~4.5 kyr as the main driver of enhanced glacial ice discharge. Conversely, our simulations evidence the potential for significant warmer subsurface waters in the Southern Ocean during the last 6 kyr in response to enhanced summer insolation south of 60°S and enhanced upwelling of Circumpolar Deep Water towards the Antarctic shelf. We conclude that ice front and basal melting may have played a dominant role in glacial discharge during the Late Holocene. |
author2 |
UCL - SST/ELI/ELIC - Earth & Climate |
format |
Article in Journal/Newspaper |
author |
Crosta, Xavier Crespin, Julien Swingedouw, Didier Marti, Olivier Masson-Delmotte, Valérie Etourneau, Johan Goosse, Hugues Braconnot, Pascale Yam, Ruth Brailovski, Irena Shemesh, Aldo |
author_facet |
Crosta, Xavier Crespin, Julien Swingedouw, Didier Marti, Olivier Masson-Delmotte, Valérie Etourneau, Johan Goosse, Hugues Braconnot, Pascale Yam, Ruth Brailovski, Irena Shemesh, Aldo |
author_sort |
Crosta, Xavier |
title |
Ocean as the main driver of Antarctic ice sheet retreat during the Holocene |
title_short |
Ocean as the main driver of Antarctic ice sheet retreat during the Holocene |
title_full |
Ocean as the main driver of Antarctic ice sheet retreat during the Holocene |
title_fullStr |
Ocean as the main driver of Antarctic ice sheet retreat during the Holocene |
title_full_unstemmed |
Ocean as the main driver of Antarctic ice sheet retreat during the Holocene |
title_sort |
ocean as the main driver of antarctic ice sheet retreat during the holocene |
publisher |
Elsevier BV |
publishDate |
2018 |
url |
http://hdl.handle.net/2078.1/224512 https://doi.org/10.1016/j.gloplacha.2018.04.007 |
geographic |
Antarctic Antarctic Peninsula East Antarctica Prydz Bay Southern Ocean The Antarctic West Antarctica |
geographic_facet |
Antarctic Antarctic Peninsula East Antarctica Prydz Bay Southern Ocean The Antarctic West Antarctica |
genre |
Antarc* Antarctic Antarctic Peninsula Antarctica East Antarctica ice core Ice Sheet Ice Shelf Ice Shelves Prydz Bay Southern Ocean West Antarctica |
genre_facet |
Antarc* Antarctic Antarctic Peninsula Antarctica East Antarctica ice core Ice Sheet Ice Shelf Ice Shelves Prydz Bay Southern Ocean West Antarctica |
op_source |
Global and Planetary Change, Vol. 166, p. 62-74 (2018) |
op_relation |
boreal:224512 http://hdl.handle.net/2078.1/224512 doi:10.1016/j.gloplacha.2018.04.007 urn:ISSN:0921-8181 urn:EISSN:1872-6364 |
op_rights |
info:eu-repo/semantics/openAccess |
op_doi |
https://doi.org/10.1016/j.gloplacha.2018.04.007 |
container_title |
Global and Planetary Change |
container_volume |
166 |
container_start_page |
62 |
op_container_end_page |
74 |
_version_ |
1798836866184642560 |