From ice-shelf tributary to tidewater glacier: continued rapid recession, acceleration and thinning of Röhss Glacier following the 1995 collapse of the Prince Gustav Ice Shelf on the Antarctic Peninsula

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dc.contributor.author Glasser, N. F.
dc.contributor.author Scambos, T. A.
dc.contributor.author Bohlander, J.
dc.contributor.author Truffer, M.
dc.contributor.author Pettit, E.
dc.contributor.author Davies, B. J.
dc.date.accessioned 2011-10-27T13:48:42Z
dc.date.available 2011-10-27T13:48:42Z
dc.date.issued 2011-10-27
dc.identifier.citation Glasser , N F , Scambos , T A , Bohlander , J , Truffer , M , Pettit , E & Davies , B J 2011 , ' From ice-shelf tributary to tidewater glacier: continued rapid recession, acceleration and thinning of Röhss Glacier following the 1995 collapse of the Prince Gustav Ice Shelf on the Antarctic Peninsula ' Journal of Glaciology , vol 57 , no. 203 , pp. 397-406 . en
dc.identifier.issn 0022-1430
dc.identifier.other PURE: 172461
dc.identifier.other dspace: 2160/7639
dc.identifier.uri http://hdl.handle.net/2160/7639
dc.description Glasser, N. F., Scambos, T. A., Bohlander, J., Truffer, M., Pettit, E., Davies, B. J. (2011). Journal of Glaciology, 57 (203), 397-406. en
dc.description.abstract We use optical (ASTER and Landsat) and radar (ERS-1 and ERS-2) satellite imagery to document changes in the Prince Gustav Ice Shelf, Antarctic Peninsula, and its tributary glaciers before and after its January 1995 collapse. The satellite image record captures the transition from an ice-shelf glacier system to a tidewater glacial system and the subsequent rapid retreat and inferred 'fatal' negative mass balances that occur as lower glacier elevations lead to higher ablation and tidewater-style calving collapse. Pre-1995 images show that the central ice shelf was fed primarily by Sjögren Glacier flowing from the Antarctic Peninsula and by Röhss Glacier flowing from James Ross Island. Numerous structural discontinuities (rifts and crevasses) and melt ponds were present on the ice shelf before the collapse. After the ice shelf collapsed, Röhss Glacier retreated rapidly, becoming a tidewater glacier in 2002 and receding a total of ~15 km between January 2001 and March 2009, losing >70% of its area. Topographic profiles of Röhss Glacier from ASTER-derived digital elevation models show a thinning of up to ~150 m, and surface speeds increased up to ninefold (0.1-0.9 m d-1) over the same period. The rates of speed increase and elevation loss, however, are not monotonic; both rates slowed between late 2002 and 2005, accelerated in 2006 and slowed again in 2008-09. We conclude that tributary glaciers react to ice-shelf removal by rapid (if discontinuous) recession, and that the response of tidewater glaciers on the Antarctic Peninsula to ice-shelf removal occurs over timescales ranging from sub-annual to decadal. en
dc.format.extent 10 en
dc.language.iso eng
dc.relation.ispartof Journal of Glaciology en
dc.title From ice-shelf tributary to tidewater glacier: continued rapid recession, acceleration and thinning of Röhss Glacier following the 1995 collapse of the Prince Gustav Ice Shelf on the Antarctic Peninsula en
dc.type Text en
dc.type.publicationtype Article (Journal) en
dc.identifier.doi http://dx.doi.org/10.3189/002214311796905578
dc.contributor.institution Institute of Geography & Earth Sciences en
dc.description.status Peer reviewed en


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