Past continental shelf evolution increased Antarctic ice sheet sensitivity to climatic conditions
Over the past 34 Million years, the Antarctic continental shelf has gradually deepened due to ice sheet loading, thermal subsidence, and erosion from repeated glaciations. The deepening that is recorded in the sedimentary deposits around the Antarctic margin indicates that after the mid-Miocene Clim...
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ftpubmed:oai:pubmedcentral.nih.gov:6063862 2023-05-15T14:07:12+02:00 Past continental shelf evolution increased Antarctic ice sheet sensitivity to climatic conditions Colleoni, Florence De Santis, Laura Montoli, Enea Olivo, Elisabetta Sorlien, Christopher C. Bart, Philip J. Gasson, Edward G. W. Bergamasco, Andrea Sauli, Chiara Wardell, Nigel Prato, Stefano 2018-07-27 http://www.ncbi.nlm.nih.gov/pmc/articles/PMC6063862/ http://www.ncbi.nlm.nih.gov/pubmed/30054536 https://doi.org/10.1038/s41598-018-29718-7 en eng Nature Publishing Group UK http://www.ncbi.nlm.nih.gov/pmc/articles/PMC6063862/ http://www.ncbi.nlm.nih.gov/pubmed/30054536 http://dx.doi.org/10.1038/s41598-018-29718-7 © The Author(s) 2018 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 license, and indicate if changes were made. The images or other third party material in this article are included in the article’s Creative Commons license, unless indicated otherwise in a credit line to the material. If material is not included in the article’s Creative Commons license 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 license, visit http://creativecommons.org/licenses/by/4.0/. CC-BY Article Text 2018 ftpubmed https://doi.org/10.1038/s41598-018-29718-7 2018-08-05T00:33:55Z Over the past 34 Million years, the Antarctic continental shelf has gradually deepened due to ice sheet loading, thermal subsidence, and erosion from repeated glaciations. The deepening that is recorded in the sedimentary deposits around the Antarctic margin indicates that after the mid-Miocene Climate Optimum (≈15 Ma), Antarctic Ice Sheet (AIS) dynamical response to climate conditions changed. We explore end-members for maximum AIS extent, based on ice-sheet simulations of a late-Pleistocene and a mid-Miocene glaciation. Fundamental dynamical differences emerge as a consequence of atmospheric forcing, eustatic sea level and continental shelf evolution. We show that the AIS contributed to the amplification of its own sensitivity to ocean forcing by gradually expanding and eroding the continental shelf, that probably changed its tipping points through time. The lack of past topographic and bathymetric reconstructions implies that so far, we still have an incomplete understanding of AIS fast response to past warm climate conditions, which is crucial to constrain its future evolution. Text Antarc* Antarctic Ice Sheet PubMed Central (PMC) Antarctic The Antarctic Scientific Reports 8 1 |
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Article Colleoni, Florence De Santis, Laura Montoli, Enea Olivo, Elisabetta Sorlien, Christopher C. Bart, Philip J. Gasson, Edward G. W. Bergamasco, Andrea Sauli, Chiara Wardell, Nigel Prato, Stefano Past continental shelf evolution increased Antarctic ice sheet sensitivity to climatic conditions |
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Article |
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Over the past 34 Million years, the Antarctic continental shelf has gradually deepened due to ice sheet loading, thermal subsidence, and erosion from repeated glaciations. The deepening that is recorded in the sedimentary deposits around the Antarctic margin indicates that after the mid-Miocene Climate Optimum (≈15 Ma), Antarctic Ice Sheet (AIS) dynamical response to climate conditions changed. We explore end-members for maximum AIS extent, based on ice-sheet simulations of a late-Pleistocene and a mid-Miocene glaciation. Fundamental dynamical differences emerge as a consequence of atmospheric forcing, eustatic sea level and continental shelf evolution. We show that the AIS contributed to the amplification of its own sensitivity to ocean forcing by gradually expanding and eroding the continental shelf, that probably changed its tipping points through time. The lack of past topographic and bathymetric reconstructions implies that so far, we still have an incomplete understanding of AIS fast response to past warm climate conditions, which is crucial to constrain its future evolution. |
format |
Text |
author |
Colleoni, Florence De Santis, Laura Montoli, Enea Olivo, Elisabetta Sorlien, Christopher C. Bart, Philip J. Gasson, Edward G. W. Bergamasco, Andrea Sauli, Chiara Wardell, Nigel Prato, Stefano |
author_facet |
Colleoni, Florence De Santis, Laura Montoli, Enea Olivo, Elisabetta Sorlien, Christopher C. Bart, Philip J. Gasson, Edward G. W. Bergamasco, Andrea Sauli, Chiara Wardell, Nigel Prato, Stefano |
author_sort |
Colleoni, Florence |
title |
Past continental shelf evolution increased Antarctic ice sheet sensitivity to climatic conditions |
title_short |
Past continental shelf evolution increased Antarctic ice sheet sensitivity to climatic conditions |
title_full |
Past continental shelf evolution increased Antarctic ice sheet sensitivity to climatic conditions |
title_fullStr |
Past continental shelf evolution increased Antarctic ice sheet sensitivity to climatic conditions |
title_full_unstemmed |
Past continental shelf evolution increased Antarctic ice sheet sensitivity to climatic conditions |
title_sort |
past continental shelf evolution increased antarctic ice sheet sensitivity to climatic conditions |
publisher |
Nature Publishing Group UK |
publishDate |
2018 |
url |
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC6063862/ http://www.ncbi.nlm.nih.gov/pubmed/30054536 https://doi.org/10.1038/s41598-018-29718-7 |
geographic |
Antarctic The Antarctic |
geographic_facet |
Antarctic The Antarctic |
genre |
Antarc* Antarctic Ice Sheet |
genre_facet |
Antarc* Antarctic Ice Sheet |
op_relation |
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC6063862/ http://www.ncbi.nlm.nih.gov/pubmed/30054536 http://dx.doi.org/10.1038/s41598-018-29718-7 |
op_rights |
© The Author(s) 2018 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 license, and indicate if changes were made. The images or other third party material in this article are included in the article’s Creative Commons license, unless indicated otherwise in a credit line to the material. If material is not included in the article’s Creative Commons license 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 license, visit http://creativecommons.org/licenses/by/4.0/. |
op_rightsnorm |
CC-BY |
op_doi |
https://doi.org/10.1038/s41598-018-29718-7 |
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Scientific Reports |
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