Antarctic ice rises and rumples: Their properties and significance for ice-sheet dynamics and evolution

Kenichi Matsuoka*, Richard C A Hindmarsh, Geir Moholdt, Michael J. Bentley, Hamish D. Pritchard, Joel Brown, Howard Conway, Reinhard Drews, Gaël Durand, Daniel Goldberg, Tore Hattermann, Jonathan Kingslake, Jan T M Lenaerts, Carlos Martín, Robert Mulvaney, Keith W. Nicholls, Frank Pattyn, Neil Ross, Ted Scambos, Pippa L. Whitehouse

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

Abstract

Locally grounded features in ice shelves, called ice rises and rumples, play a key role buttressing discharge from the Antarctic Ice Sheet and regulating its contribution to sea level. Ice rises typically rise several hundreds of meters above the surrounding ice shelf; shelf flow is diverted around them. On the other hand, shelf ice flows across ice rumples, which typically rise only a few tens of meters above the ice shelf. Ice rises contain rich histories of deglaciation and climate that extend back over timescales ranging from a few millennia to beyond the last glacial maximum. Numerical model results have shown that the buttressing effects of ice rises and rumples are significant, but details of processes and how they evolve remain poorly understood. Fundamental information about the conditions and processes that cause transitions between floating ice shelves, ice rises and ice rumples is needed in order to assess their impact on ice-sheet behavior. Targeted high-resolution observational data are needed to evaluate and improve prognostic numerical models and parameterizations of the effects of small-scale pinning points on grounding-zone dynamics.

Original languageEnglish
Pages (from-to)724-745
Number of pages22
JournalEarth-Science Reviews
Volume150
Early online date15 Sep 2015
DOIs
Publication statusPublished - 1 Nov 2015
Externally publishedYes

Keywords

  • Antarctic Ice Sheet
  • Holocene deglaciation
  • Ice dome
  • Pinning point
  • Sea-level rise

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