Antarctic ice stream thickening under Pliocene warmth
Ice streams regulate most ice mass loss in Antarctica. Determining their response to Pliocene warmth could provide insights into their future behaviour, but is hindered by poor representation of subglacial topography in ice-sheet models. We address this limitation using a high-resolution regional mo...
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ftstockholmuniv:oai:DiVA.org:su-211008 2023-05-15T13:56:08+02:00 Antarctic ice stream thickening under Pliocene warmth Mas e Braga, Martim Jones, Richard S. Bernales, Jorge Andersen, Jane L. Fredin, Ola Morlighem, Mathieu Koester, Alexandria J. Lifton, Nathaniel A. Harbor, Jonathan M. Suganuma, Yusuke Glasser, Neil F. Rogozhina, Irina Stroeven, Arjen P. application/pdf http://urn.kb.se/resolve?urn=urn:nbn:se:su:diva-211008 https://doi.org/10.21203/rs.3.rs-2151216/v1 eng eng Stockholms universitet, Institutionen för naturgeografi orcid:0000-0002-4843-1876 orcid:0000-0003-2988-0999 orcid:0000-0003-2829-6352 orcid:0000-0002-0803-3312 orcid:0000-0001-5219-1310 orcid:0000-0002-6976-3298 orcid:0000-0001-5129-0229 orcid:0000-0003-3516-1317 orcid:0000-0002-8245-2670 orcid:0000-0001-8812-2253 http://urn.kb.se/resolve?urn=urn:nbn:se:su:diva-211008 doi:10.21203/rs.3.rs-2151216/v1 info:eu-repo/semantics/openAccess Physical Geography Naturgeografi Manuscript (preprint) info:eu-repo/semantics/preprint text ftstockholmuniv https://doi.org/10.21203/rs.3.rs-2151216/v1 2023-02-23T21:44:18Z Ice streams regulate most ice mass loss in Antarctica. Determining their response to Pliocene warmth could provide insights into their future behaviour, but is hindered by poor representation of subglacial topography in ice-sheet models. We address this limitation using a high-resolution regional model for Dronning Maud Land (East Antarctica). We show that the region’s largest ice stream, Jutulstraumen, thickens by 700 m under warm late-Pliocene conditions despite ice-shelf collapse and a retrograde bed slope, while nearby ice streams thin. While it is known that unstable retreat on a retrograde slope can be slowed under certain conditions, this finding illustrates that an ice stream can thicken and gain mass. We attribute thickening to high lateral stresses at its flux gate, which constrict ice drainage. Similar stress balances occur today in 27% of East Antarctica, and understanding how lateral stresses regulate ice-stream discharge is necessary for accurately assessing Antarctica’s sea-level rise contribution. Report Antarc* Antarctic Antarctica Dronning Maud Land East Antarctica Ice Sheet Ice Shelf Stockholm University: Publications (DiVA) Antarctic Dronning Maud Land East Antarctica Jutulstraumen ENVELOPE(-1.000,-1.000,-72.000,-72.000) |
institution |
Open Polar |
collection |
Stockholm University: Publications (DiVA) |
op_collection_id |
ftstockholmuniv |
language |
English |
topic |
Physical Geography Naturgeografi |
spellingShingle |
Physical Geography Naturgeografi Mas e Braga, Martim Jones, Richard S. Bernales, Jorge Andersen, Jane L. Fredin, Ola Morlighem, Mathieu Koester, Alexandria J. Lifton, Nathaniel A. Harbor, Jonathan M. Suganuma, Yusuke Glasser, Neil F. Rogozhina, Irina Stroeven, Arjen P. Antarctic ice stream thickening under Pliocene warmth |
topic_facet |
Physical Geography Naturgeografi |
description |
Ice streams regulate most ice mass loss in Antarctica. Determining their response to Pliocene warmth could provide insights into their future behaviour, but is hindered by poor representation of subglacial topography in ice-sheet models. We address this limitation using a high-resolution regional model for Dronning Maud Land (East Antarctica). We show that the region’s largest ice stream, Jutulstraumen, thickens by 700 m under warm late-Pliocene conditions despite ice-shelf collapse and a retrograde bed slope, while nearby ice streams thin. While it is known that unstable retreat on a retrograde slope can be slowed under certain conditions, this finding illustrates that an ice stream can thicken and gain mass. We attribute thickening to high lateral stresses at its flux gate, which constrict ice drainage. Similar stress balances occur today in 27% of East Antarctica, and understanding how lateral stresses regulate ice-stream discharge is necessary for accurately assessing Antarctica’s sea-level rise contribution. |
format |
Report |
author |
Mas e Braga, Martim Jones, Richard S. Bernales, Jorge Andersen, Jane L. Fredin, Ola Morlighem, Mathieu Koester, Alexandria J. Lifton, Nathaniel A. Harbor, Jonathan M. Suganuma, Yusuke Glasser, Neil F. Rogozhina, Irina Stroeven, Arjen P. |
author_facet |
Mas e Braga, Martim Jones, Richard S. Bernales, Jorge Andersen, Jane L. Fredin, Ola Morlighem, Mathieu Koester, Alexandria J. Lifton, Nathaniel A. Harbor, Jonathan M. Suganuma, Yusuke Glasser, Neil F. Rogozhina, Irina Stroeven, Arjen P. |
author_sort |
Mas e Braga, Martim |
title |
Antarctic ice stream thickening under Pliocene warmth |
title_short |
Antarctic ice stream thickening under Pliocene warmth |
title_full |
Antarctic ice stream thickening under Pliocene warmth |
title_fullStr |
Antarctic ice stream thickening under Pliocene warmth |
title_full_unstemmed |
Antarctic ice stream thickening under Pliocene warmth |
title_sort |
antarctic ice stream thickening under pliocene warmth |
publisher |
Stockholms universitet, Institutionen för naturgeografi |
url |
http://urn.kb.se/resolve?urn=urn:nbn:se:su:diva-211008 https://doi.org/10.21203/rs.3.rs-2151216/v1 |
long_lat |
ENVELOPE(-1.000,-1.000,-72.000,-72.000) |
geographic |
Antarctic Dronning Maud Land East Antarctica Jutulstraumen |
geographic_facet |
Antarctic Dronning Maud Land East Antarctica Jutulstraumen |
genre |
Antarc* Antarctic Antarctica Dronning Maud Land East Antarctica Ice Sheet Ice Shelf |
genre_facet |
Antarc* Antarctic Antarctica Dronning Maud Land East Antarctica Ice Sheet Ice Shelf |
op_relation |
orcid:0000-0002-4843-1876 orcid:0000-0003-2988-0999 orcid:0000-0003-2829-6352 orcid:0000-0002-0803-3312 orcid:0000-0001-5219-1310 orcid:0000-0002-6976-3298 orcid:0000-0001-5129-0229 orcid:0000-0003-3516-1317 orcid:0000-0002-8245-2670 orcid:0000-0001-8812-2253 http://urn.kb.se/resolve?urn=urn:nbn:se:su:diva-211008 doi:10.21203/rs.3.rs-2151216/v1 |
op_rights |
info:eu-repo/semantics/openAccess |
op_doi |
https://doi.org/10.21203/rs.3.rs-2151216/v1 |
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1766263419319615488 |