Structure and changing dynamics of a polythermal valley glacier on a centennial timescale: Midre Lovénbreen, Svalbard

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dc.contributor.author Hambrey, Michael John
dc.contributor.author Murray, Tavi
dc.contributor.author Glasser, Neil Franklin
dc.contributor.author Hubbard, Alun Lloyd
dc.contributor.author Stuart, Graham
dc.contributor.author Hansen, Siri
dc.contributor.author Kohler, Jack
dc.date.accessioned 2008-12-12T15:31:43Z
dc.date.available 2008-12-12T15:31:43Z
dc.date.issued 2005-03
dc.identifier.citation Hambrey , M J , Murray , T , Glasser , N F , Hubbard , A L , Stuart , G , Hansen , S & Kohler , J 2005 , ' Structure and changing dynamics of a polythermal valley glacier on a centennial timescale: Midre Lovénbreen, Svalbard ' Journal of Geophysical Research , vol 110 , no. F1 , F01006 . , 10.1029/2004JF000128 en
dc.identifier.issn 0148-0227
dc.identifier.other PURE: 94585
dc.identifier.other dspace: 2160/1582
dc.identifier.uri http://hdl.handle.net/2160/1582
dc.identifier.uri http://onlinelibrary.wiley.com/doi/10.1029/2004JF000128/pdf en
dc.description Hambrey, Michael, Murray, T., Glasser, N.F., Hubbard, A., (2005) 'Structure and changing dynamics of a polythermal valley glacier on a centennial timescale: Midre Lovenbreen, Svalbard', Journal of Geophysical Research 110 pp. 1-19 RAE2008 en
dc.description.abstract Most polythermal glaciers in Svalbard, other than those of surge type, have receded steadily since the early 20th century. Midre Lovénbreen, a slow-moving, 4-km-long valley glacier terminating on land, is a typical example, and its internal structures reflect changing dynamics over this period. The three-dimensional structural style of this glacier and the sequential development of structures have been determined from surface mapping, ground-penetrating radar, and numerical flow modeling. In order of formation the structures observed today at the glacier surface are (1) primary stratification that has become folded about flow-parallel axes; (2) axial plane longitudinal foliation associated with this folding; (3) several sets of intersecting crevasse traces; (4) arcuate upglacier-dipping fractures developed as part of a thrust complex near the snout; and (5) longitudinal splaying fractures in the snout area. The long-term evolution and dynamic significance of these structures can be ascertained from historical ground and aerial photographs. Modeling indicates that stratification and foliation continue to evolve today as a result of internal deformation, especially in zones of converging flow, where simple shear is most pronounced, but within the tongue are carried passively toward the snout. Crevasse traces appear to be no longer actively forming but are interpreted as relict structures when the ice was more dynamic and mostly wet based. The interpretation of arcuate fractures near the snout as thrusts is supported by the matching orientations of modeled strain ellipses, which illustrate the importance of longitudinal compression. en
dc.format.extent 19 en
dc.language.iso eng
dc.relation.ispartof Journal of Geophysical Research en
dc.subject structural glaciology en
dc.subject polythermal glacier en
dc.subject Svalbard en
dc.subject ground-penetrating radar en
dc.subject numerical modeling en
dc.title Structure and changing dynamics of a polythermal valley glacier on a centennial timescale: Midre Lovénbreen, Svalbard en
dc.type Text en
dc.type.publicationtype Article (Journal) en
dc.identifier.doi http://dx.doi.org/10.1029/2004JF000128
dc.contributor.institution Institute of Geography & Earth Sciences en
dc.description.status Peer reviewed en


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