A structural glaciological analysis of the 2002 Larsen B Ice Shelf collapse

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dc.contributor.author Glasser, N. F.
dc.contributor.author Scambos, Ted A.
dc.date.accessioned 2009-11-30T16:31:53Z
dc.date.available 2009-11-30T16:31:53Z
dc.date.issued 2008-01-01
dc.identifier.citation Glasser , N F & Scambos , T A 2008 , ' A structural glaciological analysis of the 2002 Larsen B Ice Shelf collapse ' Journal of Glaciology , vol 54 , no. 184 , pp. 3-16 . , 10.3189/002214308784409017 en
dc.identifier.issn 0022-1430
dc.identifier.other PURE: 142296
dc.identifier.other dspace: 2160/3753
dc.identifier.uri http://hdl.handle.net/2160/3753
dc.description Glasser, N.F., Scambos, T.A. (2008) 'A structural glaciological analysis of the 2002 Larsen B ice shelf collapse', Journal of Glaciology, 54 (184), pp. 3-16 Sponsorship: US–UK Fulbright Commission; CIRES en
dc.description.abstract This study provides a detailed structural glaciological analysis of changes in surface structures on the Larsen B ice shelf on the Antarctic Peninsula prior to its collapse in February–March 2002. Mapped features include the ice-shelf front, rifts, crevasses, longitudinal linear surface structures and meltwater features. We define domains on the ice shelf related to glacier source areas and demonstrate that, prior to collapse, the central Larsen B ice shelf consisted of four sutured flow units fed by Crane, Jorum, Punchbowl and Hektoria/Green/Evans glaciers. Between these flow units were ‘suture zones’ of thinner ice where the feeder glaciers merged. Prior to collapse, large open-rift systems were present offshore of Foyn Point and Cape Disappointment. These rifts became more pronounced in the years preceding break-up, and ice blocks in the rifts rotated because of the strong lateral shear in this zone. Velocity mapping of the suture zones indicates that the major rifts were not present more than about 20 years ago. We suggest that the ice shelf was preconditioned to collapse by partial rupturing of the sutures between flow units. This, we believe, was the result of ice-shelf front retreat during 1998– 2000, reducing the lateral resistive stress on the upstream parts of the shelf and glacier flow units, ice-shelf thinning and pre-shelf-break-up glacier acceleration. en
dc.format.extent 14 en
dc.language.iso eng
dc.relation.ispartof Journal of Glaciology en
dc.title A structural glaciological analysis of the 2002 Larsen B Ice Shelf collapse en
dc.type Text en
dc.type.publicationtype Article (Journal) en
dc.identifier.doi http://dx.doi.org/10.3189/002214308784409017
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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