Holocene mountain glacier history in the Sukkertoppen Iskappe area, southwest Greenland

Schweinsberg, Avriel D.; Briner, Jason P.; Miller, Gifford H.; Lifton, Nathaniel A.; Bennike, Ole; Graham, Brandon L.

doi:10.1016/j.quascirev.2018.06.014

Cited by 24 publications

(39 citation statements)

References 109 publications

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“…We also compare our results to previously published palaeoceanographic records (Fig. 1) from the Disko Bay (Perner et al 2013;Ouellet-Bernier et al 2014;Moros et al 2016;Allan et al 2018), Ameralik fjord (Seidenkrantz et al 2007), West Greenland region (Larsen et al 2017;Levy et al 2017;Schweinsberg et al 2017Schweinsberg et al , 2018 and the northwest Labrador Sea (Gibb et al 2014(Gibb et al , 2015Fig. 1), in order to assess the regional significance of our data.…”

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confidence: 74%

“…In Arctic and sub-arctic areas, the ongoing climate change is accompanied by increased air and surface ocean temperatures, decreased sea ice cover, and enhanced ice-sheet melt (Golledge et al 2019), especially along marine ice-sheet margins (Rignot et al 2010;Hanna et al 2013;Young & Briner 2015;Briner et al 2016;Schweinsberg et al 2018). Direct linkages between recent changes in the Greenland Ice Sheet (GrIS) mass balance and the strength of the Atlantic Meridional Overturning Circulation (AMOC) have been proposed (Rahmstorfet al 2015;Jackson et al 2016).…”

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confidence: 99%

“…High summer insolation and temperatures during the Early and Middle Holocene lasted until about 5 ka BP (Briner et al 2016) and resulted in a simulated GrIS ice mass loss rate of about 100 Gt a -1 (Lecavalier et al 2014;Larsen et alf 2015;Cuzzone et al 2019). The Late Holocene experienced a cooling related to reduced summer insolation that presumably favoured the growth of the GrIS, ice caps and local glaciers since about 4000 years ago (Funder et al 2011;Briner et al 2016;Larsen et al 2017;Schweinsberg et al 2018).…”

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confidence: 99%

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Insolation vs. meltwater control of productivity and sea surface conditions off SW Greenland during the Holocene

Allan

Vernal

Seidenkrantz

et al. 2021

Boreas

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We address here the specific timing and amplitude of sea-surface conditions and productivity changes off SW Greenland, northern Labrador Sea, in response to the high deglacial meltwater rates, the Early Holocene maximum insolation and Neoglacial cooling. Dinocyst assemblages from sediment cores collected off Nuuk were used to set up quantitative records of sea ice cover, seasonal sea-surface temperature (SST), salinity (SSS), and primary productivity, with a centennial to millennial scale resolution. Until~10 ka BP, ice-proximal conditions are suggested by the quasi-exclusive dominance of heterotrophic taxa and low dinocyst concentrations. At about 10 ka BP, an increase in species diversity and abundance of phototrophic taxa marks the onset of interglacial conditions at a regional scale, with summer SST reaching up to 10°C between 8 and 5 ka BP, thus in phase with the Holocene Thermal Maximum as recorded in the southern Greenlandic areas/northern Labrador Sea. During this interval, low SSS but high productivity prevailed in response to high meltwater discharge and nutrient inputs from the Greenland Ice Sheet. After~5 ka BP, a decrease in phototrophic taxa marks a two-step cooling of surface waters. The first started at~5 ka BP, and the second at~3 ka BP, with a shift toward colder conditions and higher SSS suggesting reduced meltwater discharge during the Neoglacial. This second step coincides with the disappearance of the Saqqaq culture. The gap in human occupation in west Greenland, between the Dorset and the Norse settlements from 2000 to 1000 years BP, might be linked to high amplitude and high frequency variability of ocean and climate conditions.

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confidence: 74%

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confidence: 99%

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Insolation vs. meltwater control of productivity and sea surface conditions off SW Greenland during the Holocene

Allan

Vernal

Seidenkrantz

et al. 2021

Boreas

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“…Lake records from two other studies from Sukkertoppen Iskappe in southwest Greenland and a local ice cap at Nuussuaq in west Greenland were less conclusive (Schweinsberg et al . , ). The Sukkertoppen Iskappe and the local ice cap on Nuussuaq were smaller than at present from ~9.0 to 5.0 cal.…”

Section: Discussionmentioning

confidence: 99%

Local ice caps in Finderup Land, North Greenland, survived the Holocene Thermal Maximum

Larsen

Levy

Strunk

et al. 2019

Boreas

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Local glaciers and ice caps (GICs) comprise only ~5.4% of the total ice volume, but account for ~14–20% of the current ice loss in Greenland. The glacial history of GICs is not well constrained, however, and little is known about how they reacted to Holocene climate changes. Specifically, in North Greenland, there is limited knowledge about past GIC fluctuations and whether they survived the Holocene Thermal Maximum (HTM, ~8 to 5 ka). In this study, we use proglacial lake records to constrain the ice‐marginal fluctuations of three local ice caps in North Greenland including Flade Isblink, the largest ice cap in Greenland. Additionally, we have radiocarbon dated reworked marine molluscs in Little Ice Age (LIA) moraines adjacent to the Flade Isblink, which reveal when the ice cap was smaller than present. We found that outlet glaciers from Flade Isblink retreated inland of their present extent from ~9.4 to 0.2 cal. ka BP. The proglacial lake records, however, demonstrate that the lakes continued to receive glacial meltwater throughout the entire Holocene. This implies that GICs in Finderup Land survived the HTM. Our results are consistent with other observations from North Greenland but differ from locations in southern Greenland where all records show that the local ice caps at low and intermediate elevations disappeared completely during the HTM. We explain the north–south gradient in glacier response as a result of sensitivity to increased temperature and precipitation. While the increased temperatures during the HTM led to a complete melting of GICs in southern Greenland, GICs remained in North Greenland probably because the melting was counterbalanced by increased precipitation due to a reduction in Arctic sea‐ice extent and/or increased poleward moisture transport.

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“…kyrs BP and 1.5 cal. kyrs BP have been inferred by Schweinsberg et al (2017Schweinsberg et al ( , 2018) from 14 C dating of recently ice-entombed moss and the analysis of pro-glacial lake sediment. Interestingly, these two events correspond to periods of reduced delivery of Rink Isbrae material to core 204 CQ (Fig.…”

Section: Neoglacial Record Of Rink Isbrae-derived Lithic Sedimentation In Upernavik Troughmentioning

confidence: 99%

A high-resolution elemental record of post-glacial lithic sedimentation in Upernavik Trough, western Greenland: History of ice-sheet dynamics and ocean circulation changes over the last 9100 years

Giraudeau

Georgiadis

Caron

et al. 2020

Global and Planetary Change

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HAL is a multi-disciplinary open access archive for the deposit and dissemination of scientific research documents, whether they are published or not. The documents may come from teaching and research institutions in France or abroad, or from public or private research centers. L'archive ouverte pluridisciplinaire HAL, est destinée au dépôt et à la diffusion de documents scientifiques de niveau recherche, publiés ou non, émanant des établissements d'enseignement et de recherche français ou étrangers, des laboratoires publics ou privés.

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Holocene mountain glacier history in the Sukkertoppen Iskappe area, southwest Greenland

Cited by 24 publications

References 109 publications

Insolation vs. meltwater control of productivity and sea surface conditions off SW Greenland during the Holocene

Insolation vs. meltwater control of productivity and sea surface conditions off SW Greenland during the Holocene

Local ice caps in Finderup Land, North Greenland, survived the Holocene Thermal Maximum

A high-resolution elemental record of post-glacial lithic sedimentation in Upernavik Trough, western Greenland: History of ice-sheet dynamics and ocean circulation changes over the last 9100 years

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