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

Matsuoka, K.; Hindmarsh, R.C.A.; Moholdt, G.; Bentley, M.J.; Pritchard, H.D.; Brown, J.; Conway, H.; Drews, R.; Durand, G.; Goldberg, D.; Hattermann, T.; Kingslake, J.; Lenaerts, J.T.M.; Martin, C.; Mulvaney, R.; Nicholls, K.; Pattyn, F.; Ross, N.; Scambos, T.; Whitehouse, P.L.

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.

Citation

Matsuoka, K., Hindmarsh, R., Moholdt, G., Bentley, M., Pritchard, H., Brown, J., …Whitehouse, P. (2015). Antarctic ice rises and rumples: Their properties and significance for ice-sheet dynamics and evolution. Earth-Science Reviews, 150, 724-745. https://doi.org/10.1016/j.earscirev.2015.09.004

• Journal Article Type: Article
• Acceptance Date: Sep 11, 2015
• Online Publication Date: Sep 15, 2015
• Publication Date: Nov 1, 2015
• Deposit Date: Sep 26, 2015
• Publicly Available Date: Oct 28, 2015
• Journal: Earth-Science Reviews
• Print ISSN: 0012-8252
• Publisher: Elsevier
• Peer Reviewed: Peer Reviewed
• Volume: 150
• Pages: 724-745
• DOI: https://doi.org/10.1016/j.earscirev.2015.09.004
• Keywords: Antarctic Ice Sheet, Holocene deglaciation, Sea-level rise, Pinning point, Ice dome.
• Public URL: https://durham-repository.worktribe.com/output/1399094