Late Pleistocene Glaciation in Northeast Greenland

Krinsley, Daniel B.

doi:10.3138/9781487584962-002

Cited by 14 publications

(15 citation statements)

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“…Lateral meltwater channels occur in large numbers in the valleys whereas we only mapped very few in flatter terrain. At Centrum Sø – one of Greenland's largest lakes, Krinsley (1961) described glaciolacustrine sediments and shorelines of a former, more extensive, ice‐dammed lake. We were able to track the shorelines in a large area around Centrum Sø (Fig.…”

Section: Resultsmentioning

confidence: 99%

“…Based on the extent of the former ice‐dammed lake it was possible to verify that it was dammed by Hjørne Gletscher and Nioghalvfjerdsfjord Gletscher (cf. Krinsley 1961).…”

Section: Resultsmentioning

confidence: 99%

“…Besides that, a number of glacial landforms and deposits have been mapped including terraces and lateral meltwater channels, and glaciolacustrine, marine, aeolian and outwash sediments. The maps have never been published (Weidick & Dawes 1999), but they are stored at GEUS and have been presented in a more generalized form in other publications (Krinsley 1961; Weidick 1972; Landvik et al . 2001).…”

Section: Study Area and Previous Workmentioning

confidence: 99%

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Contrasting modes of deglaciation between fjords and inter‐fjord areas in eastern North Greenland

Larsen

Søndergaard

Levy

et al. 2020

Boreas

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Knowledge about the deglaciation history of the Greenland Ice Sheet (GrIS) is important to put the recent observations of ice loss into a longer‐term perspective. In southern Greenland, the deglaciation history is generally well constrained. In this study, we use 43 new 10Be surface exposure ages combined with existing minimum‐limiting 14C ages to constrain the deglaciation history of eastern North Greenland, including the three major fjord systems – Independence Fjord, Hagen Fjord and Danmark Fjord. The 10Be ages are generally scattered and many of the samples are significantly older than expected, with pre‐LGM ages being a result of inheritance from previous exposures. By using a Bayesian statistical approach to combine the new 10Be ages and existing 14C ages, we are able to constrain the deglaciation history. We find that the outer coast and deep fjords were rapidly deglaciated between ̃11 and 10 ka. Subsequently, the deglaciation progressed far inland up the fjords, probably as a result of increased summer surface temperatures and subsurface ocean temperatures during the Holocene Thermal Maximum. The rapid retreat of the Middle Holocene slowed when the ice sheet became land‐based in the central and southern part of the study area where the ice margin first reached its present extent by ̃6.7 ka. As the onset of Neoglacial ice advance had already commenced at ̃5 ka this limits the period when the ice margin could retreat farther inland and it probably remained within max. 30–40 km of its present extent. The contrasting behaviour between the fjords and inter‐fjord areas shows a clear topographic effect on the stability of the GrIS. These results inform how the GrIS may respond to a warmer climate in various topographic settings and may provide useful constraints for future ice‐sheet models.

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Section: Resultsmentioning

confidence: 99%

“…Based on the extent of the former ice‐dammed lake it was possible to verify that it was dammed by Hjørne Gletscher and Nioghalvfjerdsfjord Gletscher (cf. Krinsley 1961).…”

Section: Resultsmentioning

confidence: 99%

Section: Study Area and Previous Workmentioning

confidence: 99%

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Contrasting modes of deglaciation between fjords and inter‐fjord areas in eastern North Greenland

Larsen

Søndergaard

Levy

et al. 2020

Boreas

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“…Earlier information on the Quaternary geology of the region north of Nioghalvfjerdsfjorden is given by Krinsley (1961), Davies (1963Davies ( , 1972, Funder & Hjort (1980) and Hjort (1997), and on the region south of Nioghalvfjerdsfjorden in Landvik (1994), Björck et al (1994b) and Weidick et al (1996). It appears from these studies that the eastern margin of the Greenland ice sheet was located near the present outer coast by the earliest Holocene, both to the north and south of Nioghalvfjerdsfjorden (Fig.…”

Section: Previous Studiesmentioning

confidence: 99%

“…During the deglaciation, recessional moraine ridges were formed east of Bla Ê sø, and a large ice-dammed lake occupied some of the valleys north-east of Bla Ê sø. Another large ice-dammed lake has been described from the Centrumsø area 70 km to the north-east (Krinsley 1961). It was caused by glacier ice damming in the interior of Ingolf Fjord and in Hekla Sund during the last deglaciation.…”

Section: Nioghalvfjerdsfjorden Areamentioning

confidence: 99%

Late Quaternary history around Nioghalvfjerdsfjorden and Jøkelbugten, North‐East Greenland

Bennike

Weidick

2001

Boreas

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Nioghalvfjerdsfjorden in North-East Greenland is at present covered by a oating glacier. Raised marine deposits in the surrounding area contain shells of marine molluscs, bones of marine mammals and pieces of driftwood. A fairly systematic sampling of such material has been conducted, followed by extensive radiocarbon dating. We suggest that the Greenland ice sheet extended onto the shelf offshore North-East Greenland during isotope stage 2, perhaps even reaching the shelf break. During the subsequent recession of the ice sheet, the entrance of Nioghalvfjerdsfjorden had become ice-free by 9.7 cal. ka BP. The recession culminated between 7.7 and 4.5 cal. ka BP, during which time the fjord was glacier-free along its entire 80 km length. No dates younger than 4.5 cal. ka BP are available on marine material from the fjord, and it seems probable that the fjord has been continuously covered by the oating glacier since this time. The maximum glaciation was attained around AD 1900, after which thinning and recession took place. The marine limit increases from c. 40 m above sea level near the present margin of the Inland Ice to c. 65 m above sea level at the outer coast. These gures t into the regional pattern of the marine limit for areas both to the south and north. The marine fauna comprise two bivalves, Macoma calcarea and Serripes groenlandicus , that may represent a southern element present during the Holocene temperature optimum. Remains of three taxa of southern extralimital terrestrial and limnic plants were dated to 5.1 cal. ka BP, and remains of another extralimital plant were dated to 8.8 and 8.5 cal. ka BP. The known Holocene time ranges of the willow Salix arctica and the lemming Dicrostonyx torquatus have been extended back to 8.8 and 6.4 cal. ka BP, respectively, providing minimum dates for their immigration to Greenland.

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Extent of the Late-Wisconsin Glaciation in Northwest Greenland and Northern Ellesmere Island: A Review of the Glaciological and Geological Evidence

Paterson

1977

Quat. res.

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In the Camp Century core, the difference in oxygen isotope ratio between Wisconsin and Holocene ice seems too large to be purely a climatic effect. A more likely interpretation is that the Wisconsin ice originated at an elevation of at least 500 m above the present station. Total gas content measurements on the core suggest that the elevation difference was about 1300 m. These results are inconsistent with the present ice flow pattern. Three hypotheses are considered: (1) The Wisconsin ice originated near the crest of a high ridge connecting the Greenland ice sheet with an ice sheet on Ellesmere Island. (2) The Wisconsin flow pattern was similar to the present one but ice was much thicker and the ice margin considerably in advance of its present position. (3) The Wisconsin ice originated near the main Greenland ice divide whereas the Holocene ice originates within 50 km of the station. Glacial-geological data are sparse but do not appear to support the first hypothesis, while the uplift data have been interpreted in two widely different ways. The second hypothesis might explain the oxygen isotope values but not the gas content measurements. The third hypothesis is thus considered the most likely one. Differences between Wisconsin and Holocene flow patterns might result from changes in positions of the ice margins as a consequence of lowered sea level in the Wisconsin.

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Late Pleistocene Glaciation in Northeast Greenland

Cited by 14 publications

References 0 publications

Contrasting modes of deglaciation between fjords and inter‐fjord areas in eastern North Greenland

Contrasting modes of deglaciation between fjords and inter‐fjord areas in eastern North Greenland

Late Quaternary history around Nioghalvfjerdsfjorden and Jøkelbugten, North‐East Greenland

Extent of the Late-Wisconsin Glaciation in Northwest Greenland and Northern Ellesmere Island: A Review of the Glaciological and Geological Evidence

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