Ice-cliff failure via retrogressive slumping

Byron Richard Parizek, Knut Christianson, Richard B. Alley, Denis Voytenko, Irena Vaňková, Timothy H. Dixon, Ryan T. Walker, David M. Holland

Research output: Contribution to journalArticle

Abstract

Retrogressive slumping could accelerate sea-level rise if ice-sheet retreat generates ice cliffs much taller than observed today. The tallest ice cliffs, which extend roughly 100 m above sea level, calve only after ice-flow processes thin the ice to near flotation. Above some ice-cliff height limit, the stress state in ice will satisfy the material-failure criterion, resulting in faster brittle failure. New terrestrial radar data from Helheim Glacier, Greenland, suggest that taller subaerial cliffs are prone to failure by slumping, unloading submarine ice to allow buoyancy-driven full-thickness calving. Full-Stokes diagnostic modeling shows that the threshold cliff height for slumping is likely slightly above 100 m in many cases, and roughly twice that (145-285 m) in mechanically competent ice under well-drained or low-melt conditions.

Original languageEnglish (US)
Pages (from-to)449-452
Number of pages4
JournalGeology
Volume47
Issue number5
DOIs
StatePublished - May 1 2019

Fingerprint

slumping
cliff
ice
ice retreat
brittle failure
ice flow
unloading
buoyancy
ice sheet
glacier
radar
melt
sea level
well
modeling

All Science Journal Classification (ASJC) codes

  • Geology

Cite this

Parizek, B. R., Christianson, K., Alley, R. B., Voytenko, D., Vaňková, I., Dixon, T. H., ... Holland, D. M. (2019). Ice-cliff failure via retrogressive slumping. Geology, 47(5), 449-452. https://doi.org/10.1130/G45880.1
Parizek, Byron Richard ; Christianson, Knut ; Alley, Richard B. ; Voytenko, Denis ; Vaňková, Irena ; Dixon, Timothy H. ; Walker, Ryan T. ; Holland, David M. / Ice-cliff failure via retrogressive slumping. In: Geology. 2019 ; Vol. 47, No. 5. pp. 449-452.
@article{34b3d03d451a4d90ba21f27a598fa14a,
title = "Ice-cliff failure via retrogressive slumping",
abstract = "Retrogressive slumping could accelerate sea-level rise if ice-sheet retreat generates ice cliffs much taller than observed today. The tallest ice cliffs, which extend roughly 100 m above sea level, calve only after ice-flow processes thin the ice to near flotation. Above some ice-cliff height limit, the stress state in ice will satisfy the material-failure criterion, resulting in faster brittle failure. New terrestrial radar data from Helheim Glacier, Greenland, suggest that taller subaerial cliffs are prone to failure by slumping, unloading submarine ice to allow buoyancy-driven full-thickness calving. Full-Stokes diagnostic modeling shows that the threshold cliff height for slumping is likely slightly above 100 m in many cases, and roughly twice that (145-285 m) in mechanically competent ice under well-drained or low-melt conditions.",
author = "Parizek, {Byron Richard} and Knut Christianson and Alley, {Richard B.} and Denis Voytenko and Irena Vaňkov{\'a} and Dixon, {Timothy H.} and Walker, {Ryan T.} and Holland, {David M.}",
year = "2019",
month = "5",
day = "1",
doi = "10.1130/G45880.1",
language = "English (US)",
volume = "47",
pages = "449--452",
journal = "Geology",
issn = "0091-7613",
publisher = "Geological Society of America",
number = "5",

}

Parizek, BR, Christianson, K, Alley, RB, Voytenko, D, Vaňková, I, Dixon, TH, Walker, RT & Holland, DM 2019, 'Ice-cliff failure via retrogressive slumping', Geology, vol. 47, no. 5, pp. 449-452. https://doi.org/10.1130/G45880.1

Ice-cliff failure via retrogressive slumping. / Parizek, Byron Richard; Christianson, Knut; Alley, Richard B.; Voytenko, Denis; Vaňková, Irena; Dixon, Timothy H.; Walker, Ryan T.; Holland, David M.

In: Geology, Vol. 47, No. 5, 01.05.2019, p. 449-452.

Research output: Contribution to journalArticle

TY - JOUR

T1 - Ice-cliff failure via retrogressive slumping

AU - Parizek, Byron Richard

AU - Christianson, Knut

AU - Alley, Richard B.

AU - Voytenko, Denis

AU - Vaňková, Irena

AU - Dixon, Timothy H.

AU - Walker, Ryan T.

AU - Holland, David M.

PY - 2019/5/1

Y1 - 2019/5/1

N2 - Retrogressive slumping could accelerate sea-level rise if ice-sheet retreat generates ice cliffs much taller than observed today. The tallest ice cliffs, which extend roughly 100 m above sea level, calve only after ice-flow processes thin the ice to near flotation. Above some ice-cliff height limit, the stress state in ice will satisfy the material-failure criterion, resulting in faster brittle failure. New terrestrial radar data from Helheim Glacier, Greenland, suggest that taller subaerial cliffs are prone to failure by slumping, unloading submarine ice to allow buoyancy-driven full-thickness calving. Full-Stokes diagnostic modeling shows that the threshold cliff height for slumping is likely slightly above 100 m in many cases, and roughly twice that (145-285 m) in mechanically competent ice under well-drained or low-melt conditions.

AB - Retrogressive slumping could accelerate sea-level rise if ice-sheet retreat generates ice cliffs much taller than observed today. The tallest ice cliffs, which extend roughly 100 m above sea level, calve only after ice-flow processes thin the ice to near flotation. Above some ice-cliff height limit, the stress state in ice will satisfy the material-failure criterion, resulting in faster brittle failure. New terrestrial radar data from Helheim Glacier, Greenland, suggest that taller subaerial cliffs are prone to failure by slumping, unloading submarine ice to allow buoyancy-driven full-thickness calving. Full-Stokes diagnostic modeling shows that the threshold cliff height for slumping is likely slightly above 100 m in many cases, and roughly twice that (145-285 m) in mechanically competent ice under well-drained or low-melt conditions.

UR - http://www.scopus.com/inward/record.url?scp=85065546399&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=85065546399&partnerID=8YFLogxK

U2 - 10.1130/G45880.1

DO - 10.1130/G45880.1

M3 - Article

VL - 47

SP - 449

EP - 452

JO - Geology

JF - Geology

SN - 0091-7613

IS - 5

ER -

Parizek BR, Christianson K, Alley RB, Voytenko D, Vaňková I, Dixon TH et al. Ice-cliff failure via retrogressive slumping. Geology. 2019 May 1;47(5):449-452. https://doi.org/10.1130/G45880.1