Patterns of Quaternary ice sheet erosion and deposition in Fennoscandia and a theoretical framework for explanation

Klemån, Johan; Stroeven, Arjen P.; Lundqvist, Jan

doi:10.1016/j.geomorph.2007.02.049

Cited by 152 publications

(151 citation statements)

References 102 publications

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“…The large-scale form of the preglacial landscape therefore remains preserved, although in areas of selective flow the amplitude of this landscape may be enhanced through both erosion and adjacent uplift 24 Stern et al, 2005). Formerly glaciated parts of the northern hemisphere conform to this pattern (Goodfellow et al, 2007;Kleman et al, 2007;Sugden, 1978). Such landscapes reflect a stability that is promoted by thermal feedback driven by streaming of ice through narrow topographic features .…”

Section: Discussionmentioning

confidence: 99%

“…The degree of streamlining depends on factors such 7 as ice velocity and constancy of flow direction. Geomorphology thus reflects the behaviour of former ice masses and has been widely used in reconstructing mid-latitude northern hemisphere palaeo-ice-sheet dynamics Davis et al, 2006;Hall and Glasser, 2003;Kite and Hindmarsh, 2007;Kleman et al, 2007;Phillips et al, 2006;Stroeven et al, 2002;Sugden, 1978). We would therefore expect that Antarctica's landscape has recorded a similar set of features related to changing basal thermal and ice flow regimes.…”

Section: Landscapes Of Glaciationmentioning

confidence: 99%

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The evolution of the subglacial landscape of Antarctica

Jamieson

Sugden

Hulton

2010

Earth and Planetary Science Letters

134

129

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Section: Discussionmentioning

confidence: 99%

Section: Landscapes Of Glaciationmentioning

confidence: 99%

The evolution of the subglacial landscape of Antarctica

Jamieson

Sugden

Hulton

2010

Earth and Planetary Science Letters

134

129

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“…Hard, rough beds are widespread on the beds of the former Pleistocene ice sheets and also likely beneath large parts of the present-day Greenland and Antarctic ice sheets (e.g. Kleman et al, 2008;Eyles, 2012;Rippin, 2013;Krabbendam and Bradwell, 2014;Krabbendam et al, 2016). Evidence for palaeo-ice streaming on hard beds has been reported from the former Pleistocene Laurentide and British ice sheets and deglaciated parts of West Greenland…”

Section: Introductionmentioning

confidence: 99%

Sliding of temperate basal ice on a rough, hard bed: creep mechanisms, pressure melting, and implications for ice streaming

Krabbendam

2016

The Cryosphere

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Abstract. Basal ice motion is crucial to ice dynamics of ice sheets. The classic Weertman model for basal sliding over bedrock obstacles proposes that sliding velocity is controlled by pressure melting and/or ductile flow, whichever is the fastest; it further assumes that pressure melting is limited by heat flow through the obstacle and ductile flow is controlled by standard power-law creep. These last two assumptions, however, are not applicable if a substantial basal layer of temperate (T ∼ T melt ) ice is present. In that case, frictional melting can produce excess basal meltwater and efficient water flow, leading to near-thermal equilibrium. High-temperature ice creep experiments have shown a sharp weakening of a factor 5-10 close to T melt , suggesting standard power-law creep does not operate due to a switch to melt-assisted creep with a possible component of grain boundary melting. Pressure melting is controlled by meltwater production, heat advection by flowing meltwater to the next obstacle and heat conduction through ice/rock over half the obstacle height. No heat flow through the obstacle is required. Ice streaming over a rough, hard bed, as possibly in the Northeast Greenland Ice Stream, may be explained by enhanced basal motion in a thick temperate ice layer.

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“…Here most fjords exploit pre-existing river valleys and dissect relatively flat uplands. Their origin is thought to primarily reflect interplay between ice-sheet dynamics and topography (Kessler et al, 2008), while their morphology is also affected by the pattern of both basal thermal regime (Briner et al, 2008;Kleman et al, 2008) and rock strength (Augustinus, 1992;Swift et al, 2008). In the Northern Hemisphere, the interpretation of long-term evolution is based mainly on inferences from landscape form.…”

Section: Introductionmentioning

confidence: 99%

Emergence of the Shackleton Range from beneath the Antarctic Ice Sheet due to glacial erosion

Sugden¹,

Fogwill

Hein³

et al. 2014

Geomorphology

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This paper explores the long-term evolution of a subglacial fjord landscape in the Shackleton Range, Antarctica. We propose that prolonged ice-sheet erosion across a passive continental margin caused troughs to deepen and lower the surrounding icesheet surface, leaving adjacent mountains exposed. Geomorphological evidence suggests a change in the direction of regional ice flow accompanied emergence. Simple calculations suggest that isostatic compensation caused by the deepening of bounding ice-stream troughs lowered the ice-sheet surface relative to the mountains by ~ 800 m. Use of multiple cosmogenic isotopes on bedrock and erratics ( 26 Al, 10 Be, 21 Ne) provides evidence that overriding of the massif and the deepening of the adjacent troughs occurred earlier than the Quaternary. Perhaps this occurred in the mid-Miocene, as elsewhere in East Antarctica in the McMurdo Dry Valleys and the Lambert basin. The implication is that glacial erosion instigates feedback which can change ice-sheet thickness, extent and direction of flow. Indeed, as the sub-glacial troughs evolve over millions of years, they increase topographic relief and this changes the dynamics of the ice sheet.

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Patterns of Quaternary ice sheet erosion and deposition in Fennoscandia and a theoretical framework for explanation

Cited by 152 publications

References 102 publications

The evolution of the subglacial landscape of Antarctica

The evolution of the subglacial landscape of Antarctica

Sliding of temperate basal ice on a rough, hard bed: creep mechanisms, pressure melting, and implications for ice streaming

Emergence of the Shackleton Range from beneath the Antarctic Ice Sheet due to glacial erosion

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