Debris characteristics and ice-shelf dynamics in the ablation region of the McMurdo Ice Shelf, Antarctica

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dc.contributor.author Lawson, Wendy
dc.contributor.author Glasser, Neil F.
dc.contributor.author Goodsell, Becky
dc.contributor.author Copland, Luke
dc.date.accessioned 2009-12-23T10:34:39Z
dc.date.available 2009-12-23T10:34:39Z
dc.date.issued 2006
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
dc.identifier.issn 1727-5652
dc.identifier.other PURE: 142819
dc.identifier.other dspace: 2160/3909
dc.identifier.uri http://hdl.handle.net/2160/3909
dc.identifier.uri http://www.igsoc.org/journal/ en
dc.description Glasser, N. F., Goodsell, B., Copeland, L., Lawson, W. (2006) Debris characteristics and ice-shelf dynamics in the ablation region of the McMurdo Ice Shelf, Antarctica. Journal of Glaciology, 52, 177, pp 223-234 Sponsorship: Antarctica New Zealand; University of Canterbury; TransAntarctic Association; The Leverhulme Trust en
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
dc.format.extent 12 en
dc.language.iso eng
dc.relation.ispartof Journal of Glaciology en
dc.title Debris characteristics and ice-shelf dynamics in the ablation region of the McMurdo Ice Shelf, Antarctica en
dc.type Text en
dc.type.publicationtype Article (Journal) en
dc.contributor.institution Institute of Geography & Earth Sciences en
dc.contributor.institution Centre for Glaciology en
dc.description.status Peer reviewed en


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