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This work is licensed under a Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International License (CC BY-NC-ND).
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.
Author(s): Heredia Barión P, Roberts SJ, Spiegel C, Binnie SA, Wacker L, Davies J, Gabriel I, Jones VJ, Blockley S, Pearson EJ, Foster L, Davies SJ, Roland TP, Hocking EP, Bentley MJ, Hodgson DA, Hayward CL, McCulloch RD, Strelin JA, Kuhn G
Publication type: Article
Publication status: Published
Journal: The Holocene
Print publication date: 29/03/2023
Online publication date: 29/03/2023
Acceptance date: 20/01/2023
Date deposited: 04/04/2023
ISSN (print): 0959-6836
ISSN (electronic): 1477-0911
ePrints DOI: 10.57711/xdk0-me72
Data Access Statement: Datasets generated in this study are included in the main text and Supplementary Materials and 954 are available the NERC EDS UK Polar Data Centre (PDC; final assignments pending): 955 Chronological data; Lake sediment data; Advance/retreat data or on request from 956 firstname.lastname@example.org, email@example.com, and firstname.lastname@example.org. Code, 957 data, packages and package references are available on GitHub. Final figure layouts and 958 additional annotations were produced using Adobe Illustrator CC v.2021 or CorelDRAW 959 v.2020.
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