Short-term Variations in Strain and Surface Tilt on Storglaciären, Kebnekaise, Northern Sweden

Jansson, Peter; Hooke, Roger LeB.

doi:10.3189/s0022143000004512

Cited by 33 publications

(30 citation statements)

References 20 publications

(26 reference statements)

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“…Consequently, the region of high subglacial water pressures and accelerated ice motion took time to propagate downstream (Gudmundsson, 2002;Vieli and others, 2004). The region moved downstream with a velocity of 50-100 m h À 1 , which is similar to values observed on other alpine glaciers (Iken and Bindschadler, 1986;Jansson and Hooke, 1989;Gudmundsson, 2002) and our inferred value during rain events.…”

Section: Diurnal Melt Cyclessupporting

confidence: 89%

“…This propagation speed is similar to values observed at other glaciers (Iken and Bindschadler, 1986;Jansson and Hooke, 1989;Gudmundsson, 2002). A high-pressure zone propagating downstream suggests that our stations at higher elevations (G05-G06) will have returned to normal ice flow �10 hours before our stations at lower elevations (G01-G04).…”

Section: Rain Eventssupporting

confidence: 85%

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Glacier velocity and water input variability in a maritime environment: Franz Josef Glacier, New Zealand

et al. 2015

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ABSTRACT. Short-term glacier velocity variations typically occur when a water input is accommodated by an increase in the subglacial water pressure. Although these velocity variations have been well documented on many glaciers, few studies have considered them on glaciers where heavy rain and glacier melt occur year-round. This study investigates the relationship between water inputs and glacier velocity on Franz Josef Glacier, New Zealand. We installed six GNSS stations across the lower glacier during austral summer 2010/11 and one station during summer 2012/13. Glacier velocity remained elevated at all stations for �7 days following large rain events. During diurnal melt events, we find velocity variations in the early afternoon (12:00-16:00) at 600 m a.s.l. and in the late evening (20:00-01:00) at 400 m a.s.l. We hypothesize that the late-evening velocity variations occurred as an upstream region of high subglacial water pressures and accelerated ice motion propagated downstream. This mechanism may also explain the increased longitudinal compression and transverse extension across the lower glacier during speed-up events. Our results indicate that the subglacial drainage system likely decreases in efficiency upstream and that the water input variability can still cause short-term velocity variations despite the large year-round water inputs.

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Section: Diurnal Melt Cyclessupporting

confidence: 89%

Section: Rain Eventssupporting

confidence: 85%

Glacier velocity and water input variability in a maritime environment: Franz Josef Glacier, New Zealand

et al. 2015

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“…We suggest, however, that up‐basin dipping beds may provide an alternative mechanism for forming glacial steps without the factors previously studied and that up‐basin dipping beds may contribute to the formation of glacial steps in the presence of the factors mentioned above. We find tentative support for these assertions in the observations of Jansson and Hooke () at Storglaciären, Sweden where the downstream ends of two overdeepenings are formed in up‐glacier dipping rock layers, indicating geometry similar to that depicted in Fig. .…”

Section: Discussionsupporting

confidence: 80%

Influence of bedding dip on glacial erosional landforms, uinta mountains, usa

Kelly

Anders

Mitchell

2014

Geografiska Annaler: Series A, Physical Geography

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We explore the relationships amongst bedding dip, basin aspect, and glacial landforms using field observations and GIS analyses of the northwestern Uinta Mountains of Utah. We examine basins on opposing sides of three ice divides in which quartzite beds of the Mount Watson Formation maintain a near constant dip. These areas provide contrasting relationships between ice flow and bedding dip directions while holding rock type and climate constant. We map the occurrence of three glacial erosional landforms: cliffs showing evidence of quarrying, scoured surfaces polished by abrasion, and overdeepenings. Cliffs and overdeepenings are more common in basins where bedding dips up‐basin, while scoured surfaces are more prevalent where bedding dips down‐basin. The significance of jointing in controlling glacial erosional forms is well established and we propose that bedding, as well as joints, dictates the geometry of quarried blocks and influences the spatial patterns of process dominance. Where bedding dips up‐basin, the geometry of pre‐existing weaknesses favours quarrying creating both cliffs and overdeepenings. In contrast, where bedding dips down‐basin, block geometry does not favour the creation of overdeepenings via quarrying and exposed bedding planes are subjected to glacial abrasion, producing scoured surfaces.

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“…Similar events, referred to as a mini-surge from observations on Variegated Glacier (Humphrey et al, 1986), have also been observed elsewhere, e.g. on Storglaciären (Jansson and Hooke, 1989) and on Black Rapids and Fels Glaciers (Raymond et al, 1995). Iken et al (1996) performed slug tests in bore holes on Gornergletscher, Switzerland, and yielded results indicating storage changes in cavities and channels beneath the glacier.…”

Section: Subglacial Storagementioning

confidence: 91%

The concept of glacier storage: a review

Jansson

Hock

Schneider

2003

Journal of Hydrology

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487

432

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Short-term Variations in Strain and Surface Tilt on Storglaciären, Kebnekaise, Northern Sweden

Abstract: ABSTRACT. Tiltmeters that can detect changes in slope of a glacier surface as small as 0

Cited by 33 publications

References 20 publications

Glacier velocity and water input variability in a maritime environment: Franz Josef Glacier, New Zealand

Glacier velocity and water input variability in a maritime environment: Franz Josef Glacier, New Zealand

Influence of bedding dip on glacial erosional landforms, uinta mountains, usa

The concept of glacier storage: a review

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