2011
DOI: 10.5194/tc-5-659-2011
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Investigating changes in basal conditions of Variegated Glacier prior to and during its 1982–1983 surge

Abstract: Abstract. Variegated Glacier (Alaska) is known to surge periodically after a sufficient amount of cumulative mass balance is reached, but this observation is difficult to link with changes in the basal conditions. Here, using a 10-yr dataset, consisting of surface topography and surface velocity observations along a flow line for 25 dates, we have reconstructed the evolution of the basal conditions prior to and during the 1982-1983 surge. The model solves the full-Stokes problem along the central flow line usi… Show more

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Cited by 80 publications
(79 citation statements)
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“…As a consequence, several parametrisations remain very poorly constrained limiting our ability to reproduce the current state of the ice sheet. The most uncertain parametrisation is the drag exerted on the ice by the underlying bed, this can vary by several orders of magnitude depending on the bedrock roughness and water pressure (Jay-Allemand et al, 2011).…”
Section: F Gillet-chaulet Et Al: Gris Contribution To Sea-level Risementioning
confidence: 99%
“…As a consequence, several parametrisations remain very poorly constrained limiting our ability to reproduce the current state of the ice sheet. The most uncertain parametrisation is the drag exerted on the ice by the underlying bed, this can vary by several orders of magnitude depending on the bedrock roughness and water pressure (Jay-Allemand et al, 2011).…”
Section: F Gillet-chaulet Et Al: Gris Contribution To Sea-level Risementioning
confidence: 99%
“…DA is widely known in weather and oceanography forecasting, but its introduction in glaciology is fairly recent, in particular for the initial state estimation problem for sea-level rise. MacAyeal (1992) and MacAyeal (1993) introduced control methods to infer basal drag in ice-stream models, using in particular the self-adjoint property of such models, leading to many application papers (Rommelaere and MacAyeal, 1997;Vieli and Payne, 2003), and later for full Stokes models (Morlighem et al, 2010;Jay-Allemand et al, 2011). Later on, many DA and inverse methods were introduced in glaciology.…”
Section: Introductionmentioning
confidence: 99%
“…These methods have been implemented and applied with success in ice flow models of different complexity in order to infer the basal drag, one of the most uncertain model parameters (e.g. Morlighem et al, 2010;Jay-Allemand et al, 2011;Schäfer et al, 2012;GilletChaulet et al, 2012).…”
Section: Introductionmentioning
confidence: 99%