2011
DOI: 10.3189/002214311796405979
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Permanent fast flow versus cyclic surge behaviour: numerical simulations of the Austfonna ice cap, Svalbard

Abstract: ABSTRACT. A large part of the ice flux within ice caps occurs through spatially limited fast-flowing units. Some of them permanently maintain fast flow, whereas others operate in an oscillatory mode, characterized by short-lived active phases followed by long quiescent phases. This surge-type behaviour results from intrinsic rather than external factors, thus complicating estimates of glacier response to climate change. Here we present numerical model results from Austfonna, an ice cap on Svalbard that compris… Show more

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Cited by 32 publications
(71 citation statements)
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“…About one-third of the ice base is grounded below sea level down to a maximum depth of ∼ 150 m within an overdeepening in the central terminus region (Fig. 1b;Dowdeswell et al, 1986;Dunse et al, 2011). A previous velocity map based on satellite radar interferometry from data acquired in the mid-1990s revealed an ice stream in the northern (Dowdeswell et al, 2008).…”
Section: Austfonna Basin-3mentioning
confidence: 82%
“…About one-third of the ice base is grounded below sea level down to a maximum depth of ∼ 150 m within an overdeepening in the central terminus region (Fig. 1b;Dowdeswell et al, 1986;Dunse et al, 2011). A previous velocity map based on satellite radar interferometry from data acquired in the mid-1990s revealed an ice stream in the northern (Dowdeswell et al, 2008).…”
Section: Austfonna Basin-3mentioning
confidence: 82%
“…The Nordaustlandet ice caps were also the target of an expedition in the International Geophysical Year (IGY) during 1957-1958 when ice cap geometry, temperatures, mass balance and ice thickness were measured (Schytt, 1964). More recently, Austfonna has been visited by expeditions led by University of Oslo (Dunse et al, 2009(Dunse et al, , 2012(Dunse et al, , 2011. The research area is presented in Fig.…”
Section: Research Sitementioning
confidence: 99%
“…the Devon Island Ice Cap in Arctic Canada or the Academy of Sciences Ice Cap in the Russian Arctic (Dowdeswell et al, 2002). Model results suggest that the large ice thickness within these valleys allows for temperate basal conditions, and hence, basal motion as the dominant mechanism of ice flow (Dunse et al, 2011). Several basins are known to have surged in the past; Etonbreen and Bråsvellbreen in the 1930s and Basin-3 around 1850-1870 (Schytt, 1969;Lefauconnier and Hagen, 1991).…”
Section: The Austfonna Ice Capmentioning
confidence: 99%
“…Where GPR measurements are lacking, bedrock elevations are interpolated utilizing additional information from a bedrock map at 1 km horizontal resolution (Dunse et al, 2011). A detailed description of the methodology is provided in Appendix A.…”
Section: Additional Datamentioning
confidence: 99%