Ice-stream demise dynamically conditioned by trough shape and bed strength

Research output: Contribution to journalArticle

Standard Standard

Ice-stream demise dynamically conditioned by trough shape and bed strength. / Bradwell, Tom; Small, David; Fabel, Derek; Smedley, Rachel; Clark, Chris; Saher, Margot; Callard, Louise; Chiverrell, Richard; Dove, Dayton; Moreton, Steven; Roberts, David; Duller, Geoff; O'Cofaigh, Colm.

In: Science Advances, Vol. 5, No. 4, eaau1380, 24.04.2019, p. eaau1380.

Research output: Contribution to journalArticle

HarvardHarvard

Bradwell, T, Small, D, Fabel, D, Smedley, R, Clark, C, Saher, M, Callard, L, Chiverrell, R, Dove, D, Moreton, S, Roberts, D, Duller, G & O'Cofaigh, C 2019, 'Ice-stream demise dynamically conditioned by trough shape and bed strength', Science Advances, vol. 5, no. 4, eaau1380, pp. eaau1380. https://doi.org/10.1126/sciadv.aau1380

APA

Bradwell, T., Small, D., Fabel, D., Smedley, R., Clark, C., Saher, M., ... O'Cofaigh, C. (2019). Ice-stream demise dynamically conditioned by trough shape and bed strength. Science Advances, 5(4), eaau1380. [eaau1380]. https://doi.org/10.1126/sciadv.aau1380

CBE

Bradwell T, Small D, Fabel D, Smedley R, Clark C, Saher M, Callard L, Chiverrell R, Dove D, Moreton S, Roberts D, Duller G, O'Cofaigh C. 2019. Ice-stream demise dynamically conditioned by trough shape and bed strength. Science Advances. 5(4):eaau1380. https://doi.org/10.1126/sciadv.aau1380

MLA

VancouverVancouver

Bradwell T, Small D, Fabel D, Smedley R, Clark C, Saher M et al. Ice-stream demise dynamically conditioned by trough shape and bed strength. Science Advances. 2019 Apr 24;5(4):eaau1380. eaau1380. https://doi.org/10.1126/sciadv.aau1380

Author

Bradwell, Tom ; Small, David ; Fabel, Derek ; Smedley, Rachel ; Clark, Chris ; Saher, Margot ; Callard, Louise ; Chiverrell, Richard ; Dove, Dayton ; Moreton, Steven ; Roberts, David ; Duller, Geoff ; O'Cofaigh, Colm. / Ice-stream demise dynamically conditioned by trough shape and bed strength. In: Science Advances. 2019 ; Vol. 5, No. 4. pp. eaau1380.

RIS

TY - JOUR

T1 - Ice-stream demise dynamically conditioned by trough shape and bed strength

AU - Bradwell, Tom

AU - Small, David

AU - Fabel, Derek

AU - Smedley, Rachel

AU - Clark, Chris

AU - Saher, Margot

AU - Callard, Louise

AU - Chiverrell, Richard

AU - Dove, Dayton

AU - Moreton, Steven

AU - Roberts, David

AU - Duller, Geoff

AU - O'Cofaigh, Colm

PY - 2019/4/24

Y1 - 2019/4/24

N2 - Ice sheet mass loss is currently dominated by fast-flowing glaciers (ice streams) terminating in the ocean as ice shelves and resting on beds below sea level. The factors controlling ice-stream flow and retreat over longer time scales (>100 years), especially the role of three-dimensional bed shape and bed strength, remain major uncertainties. We focus on a former ice stream where trough shape and bed substrate are known, or can be defined, to reconstruct ice-stream retreat history and grounding-line movements over 15 millennia since the Last Glacial Maximum. We identify a major behavioral step change around 18,500 to 16,000 years ago—out of tune with external forcing factors—associated with the collapse of floating ice sectors and rapid ice-front retreat. We attribute this step change to a marked geological transition from a soft/weak bed to a hard/strong bed coincident with a change in trough geometry. Both these factors conditioned and ultimately hastened ice-stream demise.

AB - Ice sheet mass loss is currently dominated by fast-flowing glaciers (ice streams) terminating in the ocean as ice shelves and resting on beds below sea level. The factors controlling ice-stream flow and retreat over longer time scales (>100 years), especially the role of three-dimensional bed shape and bed strength, remain major uncertainties. We focus on a former ice stream where trough shape and bed substrate are known, or can be defined, to reconstruct ice-stream retreat history and grounding-line movements over 15 millennia since the Last Glacial Maximum. We identify a major behavioral step change around 18,500 to 16,000 years ago—out of tune with external forcing factors—associated with the collapse of floating ice sectors and rapid ice-front retreat. We attribute this step change to a marked geological transition from a soft/weak bed to a hard/strong bed coincident with a change in trough geometry. Both these factors conditioned and ultimately hastened ice-stream demise.

U2 - 10.1126/sciadv.aau1380

DO - 10.1126/sciadv.aau1380

M3 - Article

VL - 5

SP - eaau1380

JO - Science Advances

JF - Science Advances

SN - 2375-2548

IS - 4

M1 - eaau1380

ER -