Journal cover Journal topic
The Cryosphere An interactive open-access journal of the European Geosciences Union
Journal topic

Journal metrics

Journal metrics

  • IF value: 4.713 IF 4.713
  • IF 5-year value: 4.927 IF 5-year
    4.927
  • CiteScore value: 8.0 CiteScore
    8.0
  • SNIP value: 1.425 SNIP 1.425
  • IPP value: 4.65 IPP 4.65
  • SJR value: 2.353 SJR 2.353
  • Scimago H <br class='hide-on-tablet hide-on-mobile'>index value: 71 Scimago H
    index 71
  • h5-index value: 53 h5-index 53
Preprints
https://doi.org/10.5194/tc-2020-162
© Author(s) 2020. This work is distributed under
the Creative Commons Attribution 4.0 License.
https://doi.org/10.5194/tc-2020-162
© Author(s) 2020. This work is distributed under
the Creative Commons Attribution 4.0 License.

  06 Jul 2020

06 Jul 2020

Review status
This preprint is currently under review for the journal TC.

Recent acceleration of Denman Glacier (1972–2017), East Antarctica, driven by grounding line retreat and changes in ice tongue configuration

Bertie W. J. Miles1, Jim R. Jordan2, Chris R. Stokes1, Stewart S. R. Jamieson1, G. Hilmar Gudmundsson2, and Adrian Jenkins2 Bertie W. J. Miles et al.
  • 1Department of Geography, Durham University, Durham, DH1 3LE, UK
  • 2Department of Geography and Environmental Sciences, Northumbria University, Newcastle upon Tyne, NE1 8ST, UK

Abstract. Denman Glacier is one of the largest in East Antarctica, with a catchment that contains an ice volume equivalent to 1.5 m of global sea-level and which sits in the Aurora Subglacial Basin (ASB). Geological evidence of this basin’s sensitivity to past warm periods, combined with recent observations showing that Denman’s ice speed is accelerating, and its grounding line is retreating along a retrograde slope, have raised the prospect that it could contribute to near-future sea-level rise. In this study, we produce the first long-term (~ 50 years) record of past glacier behaviour (ice flow speed, ice tongue structure, and calving) and combine these observations with numerical modelling to explore the likely drivers of its recent change. We find a spatially widespread acceleration of the Denman system since the 1970s across both its grounded (17 ± 4 % acceleration; 1972–2017) and floating portions (36 ± 5 % acceleration; 1972–2017). Our numerical modelling experiments show that a combination of grounding line retreat, ice tongue thinning and the unpinning of Denman’s ice tongue from a pinning point following its last major calving event are required to simulate an acceleration comparable with observations. Given its bed topography and the geological evidence that Denman Glacier has retreated substantially in the past, its recent grounding line retreat and ice flow acceleration suggest that it could be poised to make a significant contribution to sea level over the coming century.

Bertie W. J. Miles et al.

Interactive discussion

Status: open (until 31 Aug 2020)
Status: open (until 31 Aug 2020)
AC: Author comment | RC: Referee comment | SC: Short comment | EC: Editor comment
[Subscribe to comment alert] Printer-friendly Version - Printer-friendly version Supplement - Supplement

Bertie W. J. Miles et al.

Bertie W. J. Miles et al.

Viewed

Total article views: 454 (including HTML, PDF, and XML)
HTML PDF XML Total Supplement BibTeX EndNote
281 144 29 454 17 30 29
  • HTML: 281
  • PDF: 144
  • XML: 29
  • Total: 454
  • Supplement: 17
  • BibTeX: 30
  • EndNote: 29
Views and downloads (calculated since 06 Jul 2020)
Cumulative views and downloads (calculated since 06 Jul 2020)

Viewed (geographical distribution)

Total article views: 355 (including HTML, PDF, and XML) Thereof 355 with geography defined and 0 with unknown origin.
Country # Views %
  • 1
1
 
 
 
 

Cited

Saved

No saved metrics found.

Discussed

No discussed metrics found.
Latest update: 04 Aug 2020
Publications Copernicus
Download
Short summary
We provide an historical overview of changes in Denman Glacier’s flow speed, structure and calving events since the 1960s. Based on these observations, we perform a series of numerical modelling experiments to determine the likely cause of Denman’s acceleration since the 1970s. We show that a combination of grounding line retreat, ice shelf thinning and the detachment of Denman’s ice tongue from a pinning point are the most likely causes of the observed acceleration.
We provide an historical overview of changes in Denman Glacier’s flow speed, structure and...
Citation