Holocene deglaciation and glacier readvances on the Fildes Peninsula and King George Island (Isla 25 de Mayo), South Shetland Islands, NW Antarctic Peninsula
To provide insights into glacier-climate dynamics of the South Shetland Islands (SSI), NW Antarctic Peninsula, we present a new deglaciation and readvance model for the Bellingshausen Ice Cap (BIC) on Fildes Peninsula and for King George Island/Isla 25 de Mayo (KGI) ~62°S. Deglaciation on KGI began...
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crsagepubl:10.1177/09596836231157059 2024-09-15T17:43:22+00:00 Holocene deglaciation and glacier readvances on the Fildes Peninsula and King George Island (Isla 25 de Mayo), South Shetland Islands, NW Antarctic Peninsula Heredia Barión, Pablo Roberts, Stephen J Spiegel, Cornelia Binnie, Steven A Wacker, Lukas Davies, Joanna Gabriel, Imogen Jones, Vivienne J Blockley, Simon Pearson, Emma J Foster, Louise Davies, Sarah J Roland, Thomas P Hocking, Emma P Bentley, Michael J Hodgson, Dominic A Hayward, Chris L McCulloch, Robert D Strelin, Jorge A Kuhn, Gerhard 2023 http://dx.doi.org/10.1177/09596836231157059 http://journals.sagepub.com/doi/pdf/10.1177/09596836231157059 http://journals.sagepub.com/doi/full-xml/10.1177/09596836231157059 en eng SAGE Publications https://journals.sagepub.com/page/policies/text-and-data-mining-license The Holocene volume 33, issue 6, page 636-658 ISSN 0959-6836 1477-0911 journal-article 2023 crsagepubl https://doi.org/10.1177/09596836231157059 2024-07-01T04:23:59Z To provide insights into glacier-climate dynamics of the South Shetland Islands (SSI), NW Antarctic Peninsula, we present a new deglaciation and readvance model for the Bellingshausen Ice Cap (BIC) on Fildes Peninsula and for King George Island/Isla 25 de Mayo (KGI) ~62°S. Deglaciation on KGI began after c. 15 cal. ka BP and had progressed to within present-day limits on the Fildes Peninsula, its largest ice-free peninsula, by c. 6.6–5.3 cal. ka BP. Probability density phase analysis of chronological data constraining Holocene glacier advances on KGI revealed up to eight 95% probability ‘gaps’ during which readvances could have occurred. These are grouped into four stages – Stage 1: a readvance and marine transgression, well-constrained by field data, between c. 7.4 and 6.6 cal. ka BP; Stage 2: four probability ‘gaps’, less well-constrained by field data, between c. 5.3 and 2.2 cal. ka BP; Stage 3: a well-constrained but restricted ‘readvance’ between c. 1.7 and 1.5 cal. ka BP; Stage 4: two further minor ‘readvances’, one less well-constrained by field data between c. 1.3 and 0.7 cal. ka BP (68% probability), and a ‘final’ well-constrained ‘readvance’ after <0.7 cal. ka BP. The Stage 1 readvance occurred as colder and more negative Southern Annular Mode (SAM)-like conditions developed, and marginally stronger/poleward shifted westerly winds led to more storms and precipitation on the SSI. Readvances after c. 5.3 cal. ka BP were possibly more frequent, driven by reducing spring/summer insolation at 62°S and negative SAM-like conditions, but weaker (equatorward shifted) Westerlies over the SSI led to reduced storminess, restricting readvances within or close to present day limits. Late Holocene readvances were anti-phased with subaquatic freshwater moss layers in lake records unaffected by glaciofluvial inputs. Retreat from ‘Neoglacial’ glacier limits and the recolonisation of lakes by subaquatic freshwater moss after 1950 CE is associated with recent warming/more positive SAM-like conditions. Article in Journal/Newspaper Antarc* Antarctic Antarctic Peninsula Ice cap Isla 25 de Mayo King George Island South Shetland Islands SAGE Publications The Holocene 33 6 636 658 |
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English |
description |
To provide insights into glacier-climate dynamics of the South Shetland Islands (SSI), NW Antarctic Peninsula, we present a new deglaciation and readvance model for the Bellingshausen Ice Cap (BIC) on Fildes Peninsula and for King George Island/Isla 25 de Mayo (KGI) ~62°S. Deglaciation on KGI began after c. 15 cal. ka BP and had progressed to within present-day limits on the Fildes Peninsula, its largest ice-free peninsula, by c. 6.6–5.3 cal. ka BP. Probability density phase analysis of chronological data constraining Holocene glacier advances on KGI revealed up to eight 95% probability ‘gaps’ during which readvances could have occurred. These are grouped into four stages – Stage 1: a readvance and marine transgression, well-constrained by field data, between c. 7.4 and 6.6 cal. ka BP; Stage 2: four probability ‘gaps’, less well-constrained by field data, between c. 5.3 and 2.2 cal. ka BP; Stage 3: a well-constrained but restricted ‘readvance’ between c. 1.7 and 1.5 cal. ka BP; Stage 4: two further minor ‘readvances’, one less well-constrained by field data between c. 1.3 and 0.7 cal. ka BP (68% probability), and a ‘final’ well-constrained ‘readvance’ after <0.7 cal. ka BP. The Stage 1 readvance occurred as colder and more negative Southern Annular Mode (SAM)-like conditions developed, and marginally stronger/poleward shifted westerly winds led to more storms and precipitation on the SSI. Readvances after c. 5.3 cal. ka BP were possibly more frequent, driven by reducing spring/summer insolation at 62°S and negative SAM-like conditions, but weaker (equatorward shifted) Westerlies over the SSI led to reduced storminess, restricting readvances within or close to present day limits. Late Holocene readvances were anti-phased with subaquatic freshwater moss layers in lake records unaffected by glaciofluvial inputs. Retreat from ‘Neoglacial’ glacier limits and the recolonisation of lakes by subaquatic freshwater moss after 1950 CE is associated with recent warming/more positive SAM-like conditions. |
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Article in Journal/Newspaper |
author |
Heredia Barión, Pablo Roberts, Stephen J Spiegel, Cornelia Binnie, Steven A Wacker, Lukas Davies, Joanna Gabriel, Imogen Jones, Vivienne J Blockley, Simon Pearson, Emma J Foster, Louise Davies, Sarah J Roland, Thomas P Hocking, Emma P Bentley, Michael J Hodgson, Dominic A Hayward, Chris L McCulloch, Robert D Strelin, Jorge A Kuhn, Gerhard |
spellingShingle |
Heredia Barión, Pablo Roberts, Stephen J Spiegel, Cornelia Binnie, Steven A Wacker, Lukas Davies, Joanna Gabriel, Imogen Jones, Vivienne J Blockley, Simon Pearson, Emma J Foster, Louise Davies, Sarah J Roland, Thomas P Hocking, Emma P Bentley, Michael J Hodgson, Dominic A Hayward, Chris L McCulloch, Robert D Strelin, Jorge A Kuhn, Gerhard Holocene deglaciation and glacier readvances on the Fildes Peninsula and King George Island (Isla 25 de Mayo), South Shetland Islands, NW Antarctic Peninsula |
author_facet |
Heredia Barión, Pablo Roberts, Stephen J Spiegel, Cornelia Binnie, Steven A Wacker, Lukas Davies, Joanna Gabriel, Imogen Jones, Vivienne J Blockley, Simon Pearson, Emma J Foster, Louise Davies, Sarah J Roland, Thomas P Hocking, Emma P Bentley, Michael J Hodgson, Dominic A Hayward, Chris L McCulloch, Robert D Strelin, Jorge A Kuhn, Gerhard |
author_sort |
Heredia Barión, Pablo |
title |
Holocene deglaciation and glacier readvances on the Fildes Peninsula and King George Island (Isla 25 de Mayo), South Shetland Islands, NW Antarctic Peninsula |
title_short |
Holocene deglaciation and glacier readvances on the Fildes Peninsula and King George Island (Isla 25 de Mayo), South Shetland Islands, NW Antarctic Peninsula |
title_full |
Holocene deglaciation and glacier readvances on the Fildes Peninsula and King George Island (Isla 25 de Mayo), South Shetland Islands, NW Antarctic Peninsula |
title_fullStr |
Holocene deglaciation and glacier readvances on the Fildes Peninsula and King George Island (Isla 25 de Mayo), South Shetland Islands, NW Antarctic Peninsula |
title_full_unstemmed |
Holocene deglaciation and glacier readvances on the Fildes Peninsula and King George Island (Isla 25 de Mayo), South Shetland Islands, NW Antarctic Peninsula |
title_sort |
holocene deglaciation and glacier readvances on the fildes peninsula and king george island (isla 25 de mayo), south shetland islands, nw antarctic peninsula |
publisher |
SAGE Publications |
publishDate |
2023 |
url |
http://dx.doi.org/10.1177/09596836231157059 http://journals.sagepub.com/doi/pdf/10.1177/09596836231157059 http://journals.sagepub.com/doi/full-xml/10.1177/09596836231157059 |
genre |
Antarc* Antarctic Antarctic Peninsula Ice cap Isla 25 de Mayo King George Island South Shetland Islands |
genre_facet |
Antarc* Antarctic Antarctic Peninsula Ice cap Isla 25 de Mayo King George Island South Shetland Islands |
op_source |
The Holocene volume 33, issue 6, page 636-658 ISSN 0959-6836 1477-0911 |
op_rights |
https://journals.sagepub.com/page/policies/text-and-data-mining-license |
op_doi |
https://doi.org/10.1177/09596836231157059 |
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