Skip to main content

Research Repository

Advanced Search

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

Stokes, C.R.; Corner, G.C.; Winsborrow, M.C.M.; Husum, K.; Andreassen, K.

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


Authors

G.C. Corner

M.C.M. Winsborrow

K. Husum

K. Andreassen



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 flow 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 significance 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–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 (to ∼150 m a–1) and readvances. It is significant that phases of rapid retreat were not synchronous between glaciers and most occurred regardless 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 overdeepenings 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 are priorities for future work.

Citation

Stokes, C., Corner, G., Winsborrow, M., Husum, K., & Andreassen, K. (2014). Asynchronous response of marine-terminating outlet glaciers during deglaciation of the Fennoscandian Ice Sheet. Geology, 42(5), 455-458. https://doi.org/10.1130/g35299.1

Journal Article Type Article
Publication Date May 1, 2014
Deposit Date Mar 6, 2014
Publicly Available Date May 19, 2014
Journal Geology
Print ISSN 0091-7613
Electronic ISSN 1943-2682
Publisher Geological Society of America
Peer Reviewed Peer Reviewed
Volume 42
Issue 5
Pages 455-458
DOI https://doi.org/10.1130/g35299.1
Public URL https://durham-repository.worktribe.com/output/1437515

Files






You might also like



Downloadable Citations