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dc.contributor.author Wendy en_US
dc.contributor.author Neil F. en_US
dc.contributor.author Becky en_US
dc.contributor.author Luke en_US
dc.date.accessioned 2009-12-23T10:34:39Z
dc.date.available 2009-12-23T10:34:39Z
dc.date.issued 2006 en_US
dc.identifier.citation Lawson , W , Glasser , N F , Goodsell , B & Copland , L 2006 , ' Debris characteristics and ice-shelf dynamics in the ablation region of the McMurdo Ice Shelf, Antarctica ' Journal of Glaciology , pp. 223-234 . en_US
dc.identifier.other PURE: 142819 en_US
dc.identifier.other dspace: 2160/3909 en_US
dc.identifier.uri http://hdl.handle.net/2160/3909
dc.description.abstract This paper presents observations and measurements of debris characteristics and ice-shelf dynamics in the ablation region of the McMurdo Ice Shelf in the Ross Sea sector of Antarctica. Ice-shelf surface processes and dynamics are inferred from a combination of sedimentological descriptions, ground-penetrating radar investigations and through ablation, velocity and ice-thickness measurements. Field data show that in the study area the ice shelf moves relatively slowly (1.5–18.3ma–1), has high ablation rates (43–441mm during 2003/04 summer) and is thin (6–22 m). The majority of debris on the ice shelf was originally transported into the area by a large and dynamic ice-sheet/ice-shelf system at the Last Glacial Maximum. This debris is concentrated on the ice-shelf surface and is continually redistributed by surface ablation (creating an ice-cored landscape of large debris-rich mounds), ice-shelf flow (forming medial moraines) and meltwater streams (locally reworking material and redistributing it across the ice-shelf surface). A conceptual model for supraglacial debris transport by contemporary Antarctic ice shelves is presented, which emphasizes these links between debris supply, surface ablation and ice-shelf motion. Low-velocity ice shelves such as the McMurdo Ice Shelf can maintain and sequester a debris load for thousands of years, providing a mechanism by which ice shelves can accumulate sufficient debris to contribute to sediment deposition in the oceans. en_US
dc.format.extent 12 en_US
dc.relation.ispartof Journal of Glaciology en_US
dc.title Debris characteristics and ice-shelf dynamics in the ablation region of the McMurdo Ice Shelf, Antarctica en_US
dc.contributor.pbl Institute of Geography & Earth Sciences en_US
dc.contributor.pbl Centre for Glaciology en_US


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