dc.contributor.author | Stokes, Chris R. | |
dc.contributor.author | Corner, Geoffrey D. | |
dc.contributor.author | Winsborrow, Monica | |
dc.contributor.author | Husum, Katrine | |
dc.contributor.author | Andreassen, Karin | |
dc.date.accessioned | 2015-05-27T09:37:03Z | |
dc.date.available | 2015-05-27T09:37:03Z | |
dc.date.issued | 2014-03-31 | |
dc.description.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 nearly synchronous fl ow acceleration, thinning, and retreat, but nonclimatic factors
such as changes in fjord width and depth, 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
signifi cance across a population of glaciers over millennial time scales. Here we present retreat
chronologies along with topographic data for eight major outlet glaciers that underwent similar
climatic forcing during deglaciation of the Fennoscandian Ice Sheet (ca. 18–10 ka). Retreat
rates averaged over several millennia (~30 m a<sup>–1</sup>) are less than half those recently observed on
modern-day outlet glaciers (>100 m a<sup>–1</sup>), but deglaciation was punctuated by episodes of more
rapid retreat (to ~150 m a<sup>–1</sup>) and readvances. It is signifi cant that phases of rapid retreat were
not synchronous between glaciers and most occurred regardless of any obvious atmospheric
warming. We interpret this to refl ect 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 overdeepenings in wide fjords induce episodes of rapid
retreat (>100 m a<sup>–1</sup>), 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 are priorities for future work. | en_US |
dc.description | This is the accepted manuscript version. Published version is available at <a href=http://dx.doi.org/10.1130/G35299.1>http://dx.doi.org/10.1130/G35299.1</a> | en_US |
dc.identifier.citation | Geology 42(2014) nr. 5 s. 455-458 | en_US |
dc.identifier.cristinID | FRIDAID 1177626 | |
dc.identifier.doi | 10.1130/G35299.1 | |
dc.identifier.issn | 0091-7613 | |
dc.identifier.uri | https://hdl.handle.net/10037/7691 | |
dc.identifier.urn | URN:NBN:no-uit_munin_7280 | |
dc.language.iso | eng | en_US |
dc.publisher | Geological Society of America | en_US |
dc.rights.accessRights | openAccess | |
dc.subject | VDP::Matematikk og Naturvitenskap: 400::Geofag: 450::Marin geologi: 466 | en_US |
dc.subject | VDP::Matematikk og Naturvitenskap: 400::Geofag: 450::Marin geologi: 466 | en_US |
dc.title | Asynchronous response of marine-terminating outlet glaciers during deglaciation of the Fennoscandian Ice Sheet | en_US |
dc.type | Journal article | en_US |
dc.type | Tidsskriftartikkel | en_US |
dc.type | Peer reviewed | en_US |