The marine-based NW Fennoscandian ice sheet: glacial and deglacial dynamics as reconstructed from submarine landforms

Rydningen, Tom Arne; Vorren, Tore O.; Laberg, Jan Sverre; Kolstad, Vidar

doi:10.1016/j.quascirev.2013.02.013

Cited by 49 publications

(54 citation statements)

References 53 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…These small ridges are inferred to be recessional moraines (e.g. Ó Cofaigh et al 2008;Rydningen et al 2013;Vorren et al 2015). The majority of these ridges were most probably formed during halts and/or minor re-advances of the grounding line.…”

Section: -6mentioning

confidence: 99%

See 1 more Smart Citation

New geophysical evidence for a revised maximum position of part of the NE sector of the Greenland ice sheet during the last glacial maximum

Laberg

Forwick

Husum

2017

Arktos

Self Cite

View full text Add to dashboard Cite

show abstract

Section: -6mentioning

confidence: 99%

“…The latter are interpreted to be mega-scale glacial lineations formed beneath fast-flowing ice during full glacial conditions (e.g. Stokes and Clark 2001;Rydningen et al 2013) prior to the deposition of the recessional moraines. The swath-bathymetry data also display iceberg ploughmarks and areas of smaller and transverse ridges.…”

Section: -6mentioning

confidence: 99%

New geophysical evidence for a revised maximum position of part of the NE sector of the Greenland ice sheet during the last glacial maximum

Laberg

Forwick

Husum

2017

Arktos

Self Cite

View full text Add to dashboard Cite

show abstract

“…Their work is currently the best available synthesis of the 28 geomorphological evidence relating to the last BIIS, but is still only a generalised picture owing to 29 the low-resolution and variable coverage quality of the offshore datasets used. 30 In this paper we present a refinement of this picture for the NW sector. We use recently acquired 31 marine geophysical data, in the form of both singlebeam and multibeam echosounder, alongside 32 legacy seismic sub-bottom profiles, to map in detail the 3-D shape, distribution and internal 33 character of seabed features relating to the ice sheet that once covered northern Scotland.…”

mentioning

confidence: 98%

Asymmetric ice-sheet retreat pattern around northern Scotland revealed by marine geophysical surveys

Bradwell

Stoker

2014

Earth and Environmental Science Transactions of the Royal Socie

View full text Add to dashboard Cite

This study uses marine geophysical data, principally single-beam and high-resolution multibeam echo sounder bathymetry, combined with seismic sub-bottom profiles, and existing Quaternary geological information, to map the glacial geomorphology of a large area of seafloor (∼50,000 km2) on the continental shelf around northern Scotland, from west of Lewis to north of the Orkney Islands. Our new mapping reveals the detailed pattern of submarine glacial landforms, predominantly moraines, relating to ice sheets that covered Scotland and much of the continental shelf during the Late Weichselian glaciation and earlier in the Mid to Late Pleistocene. The reconstructed retreat pattern based on geomorphological evidence highlights the large number of different retreat stages and the asymmetric, non-uniform evolution of this ice sheet sector during Late Weichselian deglaciation. Time-equivalent ice-front reconstructions show that marine sectors of the ice sheet, such as the Minch, changed their geometry significantly, perhaps rapidly; whilst other sectors remained relatively unchanged and stable. We suggest that this behaviour, governed principally by bed topography/bathymetry and ice dynamics, led to reorganisation of the Late Weichselian ice sheet as it retreated back to two main ice centres: one in Western Scotland and the other over Orkney and Shetland. This retreat pattern suggests relatively early deglaciation of NW Lewis (ca. 25 ka BP) and the mountains of far NW Scotland – the latter possibly forming a substantial ice-free land corridor. Our reconstructions differ from most previous syntheses, but are strongly supported by the independently-mapped offshore Quaternary succession and key onshore dating constraints.

show abstract

“…Its early deglaciation history, therefore, is assumed to be similar to that of Andfjorden (cf. Rydningen et al, 2013). Lyngen, however, is located much farther from Andfjorden and much farther from the shelf edge, and probably has more in common with Finnmark than Troms regarding its early deglaciation history (see below In Finnmark, the dynamics and timing of glacier retreat and re-advance are less well known than in Troms.…”

mentioning

confidence: 99%

Asynchronous response of marine-terminating outlet glaciers during deglaciation of the Fennoscandian Ice Sheet

Stokes

Corner

Winsborrow

et al. 2014

Geology

View full text Add to dashboard Cite

'Asynchronous response of marine-terminating outlet glaciers during deglaciation of the Fennoscandian Ice Sheet. ', Geology., 42 (5). pp. 455-458. Further information on publisher's website:http://dx.doi.org/10.1130/G35299.1Publisher's copyright statement:Additional information: Use policyThe full-text may be used and/or reproduced, and given to third parties in any format or medium, without prior permission or charge, for personal research or study, educational, or not-for-prot purposes provided that:• a full bibliographic reference is made to the original source • a link is made to the metadata record in DRO • the full-text is not changed in any way The full-text must not be sold in any format or medium without the formal permission of the copyright holders.Please consult the full DRO policy for further details. Abstract: Recent studies have highlighted the dynamic behavior of marine-terminating outlet glaciers over decadal time-scales, linked to both atmospheric and oceanic warming. This helps explain episodes of near-synchronous flow acceleration, thinning and retreat, but non-climatic factors such as subglacial overdeepenings can also induce rapid recession. There is support for these topographic controls on glacier retreat, but there are few long-term records to assess their significance across a population of glaciers over millennial time-scales. Here, we present retreat chronologies alongside topographic data for eight major outlet glaciers that experienced similar climatic forcing during deglaciation of the Fennoscandian Ice Sheet (ca. 18-10 cal. kyr B.P.). Retreat rates averaged over several millennia (~30 m a-1) are less than half those recently observed on modern-day outlet glaciers (>100 m a-1), but deglaciation was punctuated by episodes of more rapid retreat (up to ~150 m a-1) and re-advances. Significantly, phases of rapid retreat were not synchronous between glaciers and most occurred irrespective of any obvious atmospheric warming. We interpret this to reflect the complex interplay between external forcing and both topographic (e.g., bathymetry, width) and glaciological factors (e.g., ice catchments) that evolve through time, but conclude that basal over-deepenings in wide fjords induce episodes of rapid retreat (>100 m a-1), further exacerbated by their greater susceptibility to oceanic warming. This complicates attempts to predict the centennial-scale trajectory of outlet glaciers and suggests that modeling the interaction between neighboring catchments and the accurate description of subglacial topography beneath them is a priority for future work.Response to Reviewers: See attached cover letter and response to reviewer comments Powered by Editorial Manager® and ProduXion Manager® from Aries Systems CorporationPublisher: GSA Journal: GEOL: Geology Article ID: G35299 Recent studies have highlighted the dynamic behavior of marine-terminating 11 outlet glaciers over decadal time-scales, linked to both atmospheric and oceanic warming. 12This helps explain episodes of near-synchronous flow acc...

show abstract

The marine-based NW Fennoscandian ice sheet: glacial and deglacial dynamics as reconstructed from submarine landforms

Cited by 49 publications

References 53 publications

New geophysical evidence for a revised maximum position of part of the NE sector of the Greenland ice sheet during the last glacial maximum

New geophysical evidence for a revised maximum position of part of the NE sector of the Greenland ice sheet during the last glacial maximum

Asymmetric ice-sheet retreat pattern around northern Scotland revealed by marine geophysical surveys

Asynchronous response of marine-terminating outlet glaciers during deglaciation of the Fennoscandian Ice Sheet

Contact Info

Product

Resources

About