The most extensive Holocene advance in the Stauning Alper, East Greenland, occurred in the Little Ice Age

Hall, Brenda L.; Baroni, Carlo; Denton, George H.

doi:10.1111/j.1751-8369.2008.00058.x

Cited by 21 publications

(7 citation statements)

References 40 publications

(60 reference statements)

Supporting

Mentioning

Contrasting

Order By: Relevance

“…This is Table 2 Exposure ages calculated using alternative spallation scaling schemes and Arctic production rate . All other parameters remain the same as attributed to enhanced seasonality; the YD was characterised by very cold winters and moderately cool summers (Denton et al, 2005;Kelly et al, 2008;Hall et al, 2008b). Proxy climate data from southern Greenland are consistent with this, recording mild summers and cold, arid winters during this interval .…”

Section: Timing and Mechanisms Of Fjord Deglaciationsupporting

confidence: 69%

“…Furthermore, some glaciers advanced in Greenland during this interval (Alley et al, 2010). Moraines of the Milne Land Stage (MLS) in East Greenland record a significant readvance of both independent glaciers and the GrIS margin and are broadly constrained to the YD (Funder, 1972(Funder, , 1978Denton et al, 2005;Kelly et al, 2008;Hall et al, 2008b;Alexanderson and Håkansson, 2014). There is also evidence for a glacial readvance in West Greenland during this interval; Jakobshavn Isbrae briefly readvanced to a position on the outer-shelf , and the mid-shelf Fiskebanke moraines further south may have formed during a YD readvance (Weidick et al, 2004;Funder et al, 2011).…”

Section: Timing and Mechanisms Of Fjord Deglaciationmentioning

confidence: 98%

See 1 more Smart Citation

Evidence for the asynchronous retreat of large outlet glaciers in southeast Greenland at the end of the last glaciation

Dyke

Hughes

Murray

et al. 2014

Quaternary Science Reviews

View full text Add to dashboard Cite

Be exposure dating Fjord deglaciation a b s t r a c t Recent rapid changes in the marine-terminating sectors of the Greenland Ice Sheet (GrIS) have prompted concerns about the future stability of the ice sheet. Long-term records of ice sheet behaviour provide valuable context to assess the magnitude of current change and may help resolve the mechanisms driving deglaciation. We report 23 new 10 Be exposure ages which constrain the deglacial history of two large fjord systems in southeast (SE) Greenland. We compare our chronologies with existing data from the centre of the sector to examine the timing and style of deglaciation at a regional-scale. Glacial erratic 10 Be exposure ages demonstrate that Kangerdlugssuaq Fjord deglaciated at~11.8 ka at the end of the Younger Dryas (YD e 12.8e11.6 ka). Retreat at Kangerdlugssuaq Fjord coincided with known incursion of the warm Irminger Current (IC) onto the continental shelf; this is inferred to have initiated retreat. Comparison with recently published results from Sermilik Fjord and new 10 Be ages from Bernstorffs Fjord indicates deglaciation occurred~1 ka later in the south of the SE region. Sermilik Fjord (~10.9 ka) and Bernstorffs Fjord (~10.4 ka) deglaciated later; retreat likely occurred in response to dramatic climatic amelioration at the termination of the YD stadial. We suggest that the disparate timing of deglaciation across the SE region may be primarily explained by the varying influence of the warm IC; glaciers in southern SE Greenland were isolated from warm Atlantic waters during the YD by complex shelf bathymetry. In all fjord settings ice retreat was rapid and persistent, consistent with the absence of geomorphological evidence for stillstand or readvance events. Ice retreat was accompanied by rapid thinning and likely continued to well within present-day ice sheet margins. Glacial erratic 10 Be age determinations and geomorphological observations show no evidence for Holocene readvance events prior to the Little Ice Age (LIA).

show abstract

Section: Timing and Mechanisms Of Fjord Deglaciationsupporting

confidence: 69%

Section: Timing and Mechanisms Of Fjord Deglaciationmentioning

confidence: 98%

Evidence for the asynchronous retreat of large outlet glaciers in southeast Greenland at the end of the last glaciation

Dyke

Hughes

Murray

et al. 2014

Quaternary Science Reviews

View full text Add to dashboard Cite

show abstract

“…Increased seasonality is also connected to advection of meltwater over the North Atlantic and a reduced AMOC. The fresher meltwater-diluted water seals off the ocean surface and, especially in winter, cuts off the ocean-atmosphere exchange (Denton et al, 2005;Hall et al, 2008;Vacco et al, 2009;Buizert et al, 2014;Levy et al, 2016;Buizert et al, 2018). This results in very cold and arid winters and an increase in the extent and duration of sea ice, while summer temperatures -which primarily determine a glacier's mass balance -are less affected and may even warm up (Björck et al, 2002).…”

Section: Ice Margin Retreat During the Yd Cold Oscillation?mentioning

confidence: 99%

Younger Dryas ice margin retreat in Greenland: new evidence from southwestern Greenland

Funder

Sørensen²,

Larsen

et al. 2021

Clim. Past

View full text Add to dashboard Cite

Abstract. To date the final stage in deglaciation of the Greenland shelf, when a contiguous ice sheet margin on the inner shelf transitioned to outlet glaciers in troughs with intervening ice-free areas, we generated cosmogenic 10Be dates from bedrock knobs on six outlying islands along a stretch of 300 km of the southwestern Greenland coast. Despite 10Be inheritance influencing some dates, the ages generally support a Greenland Ice Sheet (GrIS) margin that retreated off the inner shelf during the middle Younger Dryas (YD) period. Published 10Be- and 14C-dated records show that this history of the GrIS margin is seen in other parts of Greenland but with large variations in the extent and speed of retreat, sometimes even between neighbouring areas. Areas with a chronology extending into the Allerød period show no marked ice margin change at the Allerød–YD transition except in northernmost Greenland. In contrast, landforms on the shelf (moraines and grounding zone wedges) have been suggested to indicate YD readvances or long-lasting ice margin stillstands on the middle shelf. However, these features have been dated primarily by correlation with cold periods in the ice core temperature records. Ice margin retreat during the middle and late YD is explained by advection of warm subsurface water at the ice margin and by increased seasonality. Our results therefore point to the complexity of the climate–ice margin relation and to the urgent need for direct dating of the early deglaciation history of Greenland.

show abstract

“…It is plausible that both bedrock and erratic samples contain inherited 10 Be as slow-moving, polythermal cirque glaciers are inefficient at both eroding bedrock and removing pre-existing subglacial erratics from their catchments. In comparable settings in central East Greenland, the youngest boulder samples have been used to determine the timing of deglaciation (Hall et al, 2008a, 2008b; Kelly et al, 2008). This approach is adopted for the samples from Tugtilik.…”

Section: Resultsmentioning

confidence: 99%

“…Consequently, we treat the 10 Be exposure ages from Tugtilik differently, the youngest erratic age from this site is used to determine the timing of deglaciation (e.g. Hall et al, 2008b; Kelly et al, 2008).…”

Section: Discussionmentioning

confidence: 99%

The deglaciation of coastal areas of southeast Greenland

et al. 2018

View full text Add to dashboard Cite

Large marine-terminating glaciers around the margins of the Greenland Ice Sheet have retreated, accelerated, and thinned over the last two decades. Relatively little is known about the longer-term behaviour of the Greenland Ice Sheet, yet this information is valuable for assessing the significance of modern changes. We address this by reporting 11 new beryllium-10 ( 10 Be) exposure ages from previously uninvestigated coastal areas across southeast Greenland. The new ages are combined with existing data to assess the timing of glacier retreat across the region.Results show that deglaciation occurred first in the north of the region (~68°N), and progressed southwards. This north-south progression is attributed to the influence of the warm Irminger Current on the ice margin. Areas in the south of the region were isolated from the warm waters by the shallow bathymetry of the continental shelf. This demonstrates that oceanographic forcing paced the deglaciation of southeast Greenland through the Younger Dryas and early Holocene. In most areas of southeast Greenland bedrock ages are systematically older than their counterpart boulder samples; this offset is likely the result of inherited 10 Be content in bedrock surfaces. This suggests that subglacial erosion during the last glacial cycle was insufficient to completely remove pre-existing 10 Be content. Alternatively, this pattern may be the signature of a substantial retreat and advance cycle prior to final Holocene deglaciation.

show abstract

The most extensive Holocene advance in the Stauning Alper, East Greenland, occurred in the Little Ice Age

Cited by 21 publications

References 40 publications

Evidence for the asynchronous retreat of large outlet glaciers in southeast Greenland at the end of the last glaciation

Evidence for the asynchronous retreat of large outlet glaciers in southeast Greenland at the end of the last glaciation

Younger Dryas ice margin retreat in Greenland: new evidence from southwestern Greenland

The deglaciation of coastal areas of southeast Greenland

Contact Info

Product

Resources

About