Tracing the deglaciation since the Last Glacial Maximum

Nývlt, Daniel; Glasser, Neil F.; Hocking, Emma P.; Oliva, Marc; Sj, Roberts; Roman, Matěj

doi:10.1016/b978-0-12-817925-3.00005-7

Cited by 4 publications

(5 citation statements)

References 141 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Ice retreat on land after deglaciation from offshore LGM limits across the SSI occurred c. 11-8 cal. ka BP, constrained by ages obtained from glacially polished bedrock surfaces on the Barton and Weaver peninsulas, cosmogenic nuclide exposure ages, and the onset of lake sedimentation on Barton Peninsula, Fildes Peninsulas (KGI), and Byers Peninsula (Livingston Island) (Björck et al, 1996;Seong et al, 2008;Watcham et al, 2011;Toro et al, 2013;Oliva et al, 2016a, b;Nývlt et al, 2020).…”

Section: Early Holocene Terrestrial Deglaciationmentioning

confidence: 99%

“…During the global Last Glacial Maximum [g-LGM; 23-19 cal. ka BP, calibrated radiocarbon age in thousands of years before present (Hughes et al, 2013)], the AP ice sheet extended toward the shelf edge, and a secondary, smaller ice cap covered the northwest AP/SSI region, reaching the outer continental shelf ~50 km north of its present location in the inner fjords of the Maxwell Bay, King George Island (KGI), SSI (Figures 1B, C) (John and Sugden, 1971;Curl, 1980;Ó Cofaigh et al, 2014;Nývlt et al, 2020). Deglaciation on KGI began broadly after 15.4 ± 2.5 ka (Seong et al, 2008), and Maxwell Bay was deglaciated between c. 14.8 and 14.1 cal.…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

The impact of Holocene deglaciation and glacial dynamics on the landscapes and geomorphology of Potter Peninsula, King George Island (Isla 25 Mayo), NW Antarctic Peninsula

et al. 2023

Self Cite

View full text Add to dashboard Cite

The timing and impact of deglaciation and Holocene readvances on the terrestrial continental margins of the Antarctic Peninsula (AP) have been well-studied but are still debated. Potter Peninsula on King George Island (KGI) (Isla 25 de Mayo), South Shetland Islands (SSI), NW Antarctic Peninsula, has a detailed assemblage of glacial landforms and stratigraphic exposures for constraining deglacial landscape development and glacier readvances. We undertook new morphostratigraphic mapping of the deglaciated foreland of the Warszawa Icefield, an outlet of the Bellingshausen (Collins) Ice Cap on Potter Peninsula, using satellite imagery and new lithofacies recognition and interpretations, combined with new chronostratigraphic analysis of stratigraphic sections, lake sediments, and moraine deposits. Results show that the deglaciation on Potter Peninsula began before c. 8.2 ka. Around c. 7.0 ka, the Warszawa Icefield and the marine-facing Fourcade Glacier readvanced across Potter Peninsula and to the outer part of Potter Cove. Evidence of further readvances on Potter Peninsula was absent until the Warszawa Icefield margin was landward of its present position on three occasions: c. 1.7–1.4 ka, after c. 0.7 ka (most likely c. 0.5–0.1 ka), and by 1956 CE. The timing of Holocene deglaciation and glacier fluctuations on Potter Peninsula are broadly coeval with other glacier- and ice-free areas on the SSI and the northern AP and likely driven by interactions between millennial–centennial-scale changes in solar insolation and irradiance, the southern westerlies, and the Southern Annular Mode.

show abstract

Section: Early Holocene Terrestrial Deglaciationmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

The impact of Holocene deglaciation and glacial dynamics on the landscapes and geomorphology of Potter Peninsula, King George Island (Isla 25 Mayo), NW Antarctic Peninsula

et al. 2023

Self Cite

View full text Add to dashboard Cite

show abstract

“…Field-based reconstructions of Antarctic ice sheet and ice cap deglaciation after the Last Glacial and into the Holocene are important components of ice sheet models used to examine the impact of future ice-melt on rates of regional-global sea-level change (Sugden and Clapperton, 1977;Ó Cofaigh et al, 2014;Lindow et al, 2014;Simms et al, 2018Simms et al, , 2019Kaplan et al, 2020;Nývlt et al, 2020;Oliva et al, 2020). Despite numerous studies, the Early to Mid-Holocene deglaciation and the number, timing, and extent of Mid-to Late Holocene glacier readvances on the northern Antarctic Peninsula (NAP) and South Shetland Islands (SSI) remains debated (Hall, 2007(Hall, , 2009Simms et al, 2011;Watcham et al, 2011;Simms et al, 2011Simms et al, , 2012Ó Cofaigh et al, 2014;Emslie et al, 2019;Oliva et al, 2019).…”

Section: Introductionmentioning

confidence: 99%

Holocene deglaciation and glacier readvances on the Fildes Peninsula and King George Island (Isla 25 de Mayo), South Shetland Islands, NW Antarctic Peninsula

Barión

Spiegel

et al. 2023

The Holocene

View full text Add to dashboard Cite

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.

show abstract

“…Only <0.5% of the total area of the Antarctic continent is ice free (between 32,000–60,000 km 2 ; Burton‐Johnson et al, 2016) and only a small proportion of the land surface has become exposed during the Holocene (Nývlt et al, 2020). Indeed, most coastal ice‐free environments in Maritime Antarctica (Bentley et al, 2009; Giralt et al, 2020; Ó Cofaigh et al, 2014), as well as several nunataks across the continent (Small et al, 2019), were deglaciated during the Holocene Thermal Maximum (HTM) that occurred globally at ca.…”

Section: Introductionmentioning

confidence: 99%

Holocene deglaciation of the northern Fildes Peninsula, King George Island, Antarctica

et al. 2023

Self Cite

View full text Add to dashboard Cite

The timing and magnitude of Holocene glacial oscillations in most currently ice‐free areas of Antarctica remain unknown. This work focuses on the recent deglaciation in the northern sector of the Fildes Peninsula, King George Island, northern Antarctic Peninsula. The ice cap covering ca. 90% of the island has receded since the Last Glacial Maximum and exposed ca. 29 km2 of ice‐free land. We reconstruct its glacial history based on a dataset of 12 36Cl exposure ages obtained through cosmic‐ray exposure (CRE) dating of moraine boulders, polished surfaces and erratic boulders surrounding the peninsula's northern plateau. Results reveal that the deglaciation of the northern Fildes Peninsula took place during the Holocene Thermal Maximum at 7–6 ka, when warm conditions promoted a massive glacial retreat. The present arrangement of ice‐free areas was in place by 6 ka. Small cirque moraines suggest the subsequent occurrence of favourable climate conditions for glacial expansion fed by intense snow deflation at 4.6 and 1 ka at the foot of the northern plateau. The deglaciation pattern of the Fildes Peninsula resulted from the combined shrinkage of different ice masses, rather than of the long‐term retreat of the King George Ice Cap. No evidence of glacier expansion during more recent cold periods (i.e. the Little Ice Age) was found. These results fit well with regional deglacial histories inferred from lacustrine sediments and raised beaches and complement the existing chronological framework to help better understand the peninsula's Holocene geoecological dynamics.

show abstract

Tracing the deglaciation since the Last Glacial Maximum

Cited by 4 publications

References 141 publications

The impact of Holocene deglaciation and glacial dynamics on the landscapes and geomorphology of Potter Peninsula, King George Island (Isla 25 Mayo), NW Antarctic Peninsula

The impact of Holocene deglaciation and glacial dynamics on the landscapes and geomorphology of Potter Peninsula, King George Island (Isla 25 Mayo), NW Antarctic Peninsula

Holocene deglaciation and glacier readvances on the Fildes Peninsula and King George Island (Isla 25 de Mayo), South Shetland Islands, NW Antarctic Peninsula

Holocene deglaciation of the northern Fildes Peninsula, King George Island, Antarctica

Contact Info

Product

Resources

About