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

• Published in: Earth-Science Reviews
• Main Authors: Kenichi, Matsuoka, Hindmarsh, Richard C.A., Moholdt, Geir, Bentley, Mj, Pritchard, H.D., Brown, J., Conway, H., Drews, Reinhard, Durand, Gaël, Goldberg, Daniel, Hattermann, Tore, Kingslake, J., Lenaerts, J., Martin, M., Mulvaney, R., Nicholls, Keith W., Pattyn, F., Ross, N., Scambos, Ted, Whitehouse, P. L.
• Other Authors: Norwegian Polar Institute, British Antarctic Survey (BAS), Natural Environment Research Council (NERC), Durham University, University of Washington Seattle, Université libre de Bruxelles (ULB), Laboratoire de glaciologie et géophysique de l'environnement (LGGE), Observatoire des Sciences de l'Univers de Grenoble (OSUG), Université Joseph Fourier - Grenoble 1 (UJF)-Institut polytechnique de Grenoble - Grenoble Institute of Technology (Grenoble INP )-Institut national des sciences de l'Univers (INSU - CNRS)-Institut national de recherche en sciences et technologies pour l'environnement et l'agriculture (IRSTEA)-Université Savoie Mont Blanc (USMB Université de Savoie Université de Chambéry )-Centre National de la Recherche Scientifique (CNRS)-Université Joseph Fourier - Grenoble 1 (UJF)-Institut polytechnique de Grenoble - Grenoble Institute of Technology (Grenoble INP )-Institut national des sciences de l'Univers (INSU - CNRS)-Institut national de recherche en sciences et technologies pour l'environnement et l'agriculture (IRSTEA)-Université Savoie Mont Blanc (USMB Université de Savoie Université de Chambéry )-Centre National de la Recherche Scientifique (CNRS)-Centre National de la Recherche Scientifique (CNRS), School of Geosciences Edinburgh, University of Edinburgh (Edin.), Alfred-Wegener-Institut, Helmholtz-Zentrum für Polar- und Meeresforschung = Alfred Wegener Institute for Polar and Marine Research = Institut Alfred-Wegener pour la recherche polaire et marine (AWI), Helmholtz-Gemeinschaft = Helmholtz Association, Akvaplan-Niva Tromsø, Norwegian Institute for Water Research (NIVA), Institute for Marine and Atmospheric Research Utrecht (IMAU), Universiteit Utrecht / Utrecht University Utrecht, Newcastle University Newcastle, University of Colorado Boulder
• Format: Article in Journal/Newspaper
• Language: English
• Published: HAL CCSD 2015
• Subjects: Holocene deglaciation; Antarctic Ice Sheet; Sea-level rise; Pinning point; Ice dome; [SDE]Environmental Sciences; Antarc*; Antarctic; Ice Sheet; Ice Shelf; Ice Shelves
• Online Access: https://insu.hal.science/insu-01326169; https://insu.hal.science/insu-01326169/document; https://insu.hal.science/insu-01326169/file/1-s2.0-S0012825215300416-main.pdf; https://doi.org/10.1016/j.earscirev.2015.09.004

International audience 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.