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High spatial and temporal variability in Antarctic ice discharge linked to ice shelf buttressing and bed geometry

Antarctica’s contribution to global mean sea level rise has been driven by an increase in ice discharge into the oceans. The rate of change and the mechanisms that drive variability in ice discharge are therefore important to consider in the context of projected future warming. Here, we report obser...

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Autores principales: Miles, Bertie W. J., Stokes, Chris R., Jamieson, Stewart S. R., Jordan, Jim R., Gudmundsson, G. Hilmar, Jenkins, Adrian
Formato: Online Artículo Texto
Lenguaje:English
Publicado: Nature Publishing Group UK 2022
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC9243100/
https://www.ncbi.nlm.nih.gov/pubmed/35768612
http://dx.doi.org/10.1038/s41598-022-13517-2
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author Miles, Bertie W. J.
Stokes, Chris R.
Jamieson, Stewart S. R.
Jordan, Jim R.
Gudmundsson, G. Hilmar
Jenkins, Adrian
author_facet Miles, Bertie W. J.
Stokes, Chris R.
Jamieson, Stewart S. R.
Jordan, Jim R.
Gudmundsson, G. Hilmar
Jenkins, Adrian
author_sort Miles, Bertie W. J.
collection PubMed
description Antarctica’s contribution to global mean sea level rise has been driven by an increase in ice discharge into the oceans. The rate of change and the mechanisms that drive variability in ice discharge are therefore important to consider in the context of projected future warming. Here, we report observations of both decadal trends and inter-annual variability in ice discharge across the Antarctic Ice Sheet at a variety of spatial scales that range from large drainage basins to individual outlet glacier catchments. Overall, we find a 37 ± 11 Gt year(−1) increase in discharge between 1999 and 2010, but a much smaller increase of 4 ± 8 Gt year(−1) between 2010 and 2018. Furthermore, comparisons reveal that neighbouring outlet glaciers can behave synchronously, but others show opposing trends, despite their close proximity. We link this spatial and temporal variability to changes in ice shelf buttressing and the modulating effect of local glacier geometry.
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spelling pubmed-92431002022-07-01 High spatial and temporal variability in Antarctic ice discharge linked to ice shelf buttressing and bed geometry Miles, Bertie W. J. Stokes, Chris R. Jamieson, Stewart S. R. Jordan, Jim R. Gudmundsson, G. Hilmar Jenkins, Adrian Sci Rep Article Antarctica’s contribution to global mean sea level rise has been driven by an increase in ice discharge into the oceans. The rate of change and the mechanisms that drive variability in ice discharge are therefore important to consider in the context of projected future warming. Here, we report observations of both decadal trends and inter-annual variability in ice discharge across the Antarctic Ice Sheet at a variety of spatial scales that range from large drainage basins to individual outlet glacier catchments. Overall, we find a 37 ± 11 Gt year(−1) increase in discharge between 1999 and 2010, but a much smaller increase of 4 ± 8 Gt year(−1) between 2010 and 2018. Furthermore, comparisons reveal that neighbouring outlet glaciers can behave synchronously, but others show opposing trends, despite their close proximity. We link this spatial and temporal variability to changes in ice shelf buttressing and the modulating effect of local glacier geometry. Nature Publishing Group UK 2022-06-29 /pmc/articles/PMC9243100/ /pubmed/35768612 http://dx.doi.org/10.1038/s41598-022-13517-2 Text en © The Author(s) 2022 https://creativecommons.org/licenses/by/4.0/Open Access This article is licensed under a Creative Commons Attribution 4.0 International License, which permits use, sharing, adaptation, distribution and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons licence, and indicate if changes were made. The images or other third party material in this article are included in the article's Creative Commons licence, unless indicated otherwise in a credit line to the material. If material is not included in the article's Creative Commons licence and your intended use is not permitted by statutory regulation or exceeds the permitted use, you will need to obtain permission directly from the copyright holder. To view a copy of this licence, visit http://creativecommons.org/licenses/by/4.0/ (https://creativecommons.org/licenses/by/4.0/) .
spellingShingle Article
Miles, Bertie W. J.
Stokes, Chris R.
Jamieson, Stewart S. R.
Jordan, Jim R.
Gudmundsson, G. Hilmar
Jenkins, Adrian
High spatial and temporal variability in Antarctic ice discharge linked to ice shelf buttressing and bed geometry
title High spatial and temporal variability in Antarctic ice discharge linked to ice shelf buttressing and bed geometry
title_full High spatial and temporal variability in Antarctic ice discharge linked to ice shelf buttressing and bed geometry
title_fullStr High spatial and temporal variability in Antarctic ice discharge linked to ice shelf buttressing and bed geometry
title_full_unstemmed High spatial and temporal variability in Antarctic ice discharge linked to ice shelf buttressing and bed geometry
title_short High spatial and temporal variability in Antarctic ice discharge linked to ice shelf buttressing and bed geometry
title_sort high spatial and temporal variability in antarctic ice discharge linked to ice shelf buttressing and bed geometry
topic Article
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC9243100/
https://www.ncbi.nlm.nih.gov/pubmed/35768612
http://dx.doi.org/10.1038/s41598-022-13517-2
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