A Monte Carlo error analysis for basal sliding velocity calculations


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dc.contributor.author Chandler, David M.
dc.contributor.author Hubbard, Alun L.
dc.contributor.author Hubbard, Bryn
dc.contributor.author Nienow, P. W.
dc.date.accessioned 2011-04-20T11:29:38Z
dc.date.available 2011-04-20T11:29:38Z
dc.date.issued 2006
dc.identifier.citation Chandler , D M , Hubbard , A L , Hubbard , B & Nienow , P W 2006 , ' A Monte Carlo error analysis for basal sliding velocity calculations ' Journal of Geophysical Research : Earth Surface , vol 111 , no. F4 , F04005 . , 10.1029/2006JF000476 en
dc.identifier.issn 2169-9011
dc.identifier.other PURE: 158745
dc.identifier.other dspace: 2160/6681
dc.identifier.uri http://hdl.handle.net/2160/6681
dc.identifier.uri http://www.agu.org/journals/jf/jf0604/2006JF000476/2006JF000476.pdf en
dc.description Chandler, D. M., Hubbard, A. L., Hubbard, B. P., Nienow, P. W. (2006). A Monte Carlo error analysis for basal sliding velocity calculations. Journal of Geophysical Research-Earth Surface, 111 (F4) Sponsorship: NERC studentship NER/S/A/2001/06374 (D.C.) and NERC grant NER/A/S/2002/ 00607 (D.C. and B.H.). en
dc.description.abstract Since glacier beds are mostly inaccessible, numerical inversion of the surface velocity field provides a valuable method for calculating the basal shear stress and sliding velocity. However, previous theoretical studies (limited either to planar slabs or linear ice rheology) have suggested small errors in surface velocity measurements lead to large uncertainties in calculated basal sliding. Here a numerical ice flow model and Monte Carlo simulation are used to calculate the sliding velocity and basal shear stress and their associated uncertainties from field measurements of surface velocity along a two-dimensional long section of Glacier de Tsanfleuron, Switzerland. The model does not require the restrictive assumption of a sliding law since both sliding and basal shear stress are calculated independently and can include a spatially variable rate factor in the flow law for ice. Results indicate that sliding contributes between 45 and 84% of the surface velocity and that calculated sliding velocities are strongly dependent on ice rheology. Amplification of surface velocity errors is generally smaller than theoretical estimates and is a power law function of the horizontal grid spacing in the ice flow model. en
dc.language.iso eng
dc.relation.ispartof Journal of Geophysical Research : Earth Surface en
dc.title A Monte Carlo error analysis for basal sliding velocity calculations en
dc.type Text en
dc.type.publicationtype Article (Journal) en
dc.identifier.doi http://dx.doi.org/10.1029/2006JF000476
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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