Numerical modeling of glacial sediment production and transport during deglaciation

Winter, Ilja L. de; Storms, J.E.A.; Overeem, I.

doi:10.1016/j.geomorph.2012.05.023

Cited by 24 publications

(32 citation statements)

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“…Thus, a small vertical rise in the ELA (e.g. 10 m ) will cause a larger increase in ablation area size on a glacier with a low surface profile, compared to one with a steeper gradient (Kuhn et al, 1985;Giesen and Oerlemans, 2010;de Winter et al, 2012;Oerlemans, 2012) (Fig. 9).…”

Section: Glacier Bed Gradientmentioning

confidence: 99%

“…Kuhn et al, 1985;Davies and Glasser, 2012;Lovell et al, 2019). As icefield recession continued, the break-up of plateau ice into smaller ice masses could have given rise to non-climatic stillstands (Greene, 1992;Reitner, 2007;Lukas, 2007b;de Winter et al, 2012). The reasons behind such topographically controlled or external stillstands can be found in: (i) a change in valley cross-section and/or aspect, such as ice retreating from a broad to narrower valleythis leads to a decrease in the surface area exposed to ablation while maintaining the same ice volume, causing stabilization (Greene, 1992;Barr and Lovell, 2014); and (ii) a division of a large ice mass into two or more smaller ones at valley junctions in complex terrain (e.g.…”

Section: Geometric Controls On Plateau Icefield Recessionmentioning

confidence: 99%

“…Previous research on the dynamics of plateau icefields has focused on spatial and temporal changes in thermal regime (e.g. Gellatly et al ., ; Dyke, ; Rea et al ., ; Evans et al ., , ), debris erosion and transport (Evans, ; de Winter et al ., ), and modelled predictions of future survival (e.g. Nesje et al ., ; Giesen and Oerlemans, ).…”

Section: Introductionmentioning

confidence: 99%

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Topographic controls on plateau icefield recession: insights from the Younger Dryas Monadhliath Icefield, Scotland

Boston

Lukas

2019

J Quaternary Science

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Plateau icefields are a common form of mountain ice mass, frequently found in mid‐latitude to high‐arctic regions and increasingly recognized in the Quaternary record. Their top‐heavy hypsometry makes them highly sensitive to changes in climate when the equilibriaum line altitude (ELA) lies above the plateau edge, allowing ice to expand significantly as regional ELAs decrease, and causing rapid recession as climate warms. With respect to future climate warming, it is important to understand the controls on plateau icefield response to climate change in order to better predict recession rates, with implications for water resources and sea‐level rise. Improving knowledge of the controls on glacier recession may also enable further palaeoclimatic information to be extracted from the Quaternary glacial record. We use the distribution of moraines to examine topographic controls on Younger Dryas icefield recession in Scotland. We find that overall valley morphology influences the style of recession, through microclimatic and geometric controls, with bed gradient affecting moraine spacing. Ice mass reconfiguration may occur as recession progresses because ice divide migration could alter the expected response based on hypsometric distribution. These results add to a growing body of research examining controls on glacier recession and offer a step towards unravelling non‐linear ice mass behaviour. Copyright © 2019 John Wiley & Sons, Ltd.

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Section: Glacier Bed Gradientmentioning

confidence: 99%

Section: Geometric Controls On Plateau Icefield Recessionmentioning

confidence: 99%

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Topographic controls on plateau icefield recession: insights from the Younger Dryas Monadhliath Icefield, Scotland

Boston

Lukas

2019

J Quaternary Science

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“…In general, bedrock river incision is driven by uplift, discharge and variations in rock resistance (Bridgland and Westaway, 2008;Cutler et al, 2003;de Winter et al, 2012;Fuchs et al, 2013;Johnson et al, 2011;Viveen et al, 2013;Whipple and Tucker, 1999). Changes in erosion rate due to changes in climate and sediment supply lead to phases of incision.…”

Section: Introductionmentioning

confidence: 99%

Bedrock river incision response to basin connection along the Jinshan Gorge, Yellow River, North China

Liang

Zhang

et al. 2015

Journal of Asian Earth Sciences

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“…Models exist which compute the sediment displacement as a result of the movement of glaciers (e.g., Boulton, 1996;de Winter et al, 2012), but since the ice sheet thickness, as in most GIA models, is not a dynamic model component, erosion is not coupled to the changes in ice thickness in this study. Instead, the amount of GISR is derived from the literature on observed sediment deposits and reported output from a coupled ice-sediment model.…”

Section: Introductionmentioning

confidence: 99%

The effect of sediment loading in Fennoscandia and the Barents Sea during the last glacial cycle on glacial isostatic adjustment observations

Wal

IJpelaar²

2017

Solid Earth

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Abstract. Models for glacial isostatic adjustment (GIA) routinely include the effects of meltwater redistribution and changes in topography and coastlines. Since the sediment transport related to the dynamics of ice sheets may be comparable to that of sea level rise in terms of surface pressure, the loading effect of sediment deposition could cause measurable ongoing viscous readjustment. Here, we study the loading effect of glacially induced sediment redistribution (GISR) related to the Weichselian ice sheet in Fennoscandia and the Barents Sea. The surface loading effect and its effect on the gravitational potential is modeled by including changes in sediment thickness in the sea level equation following the method of Dalca et al. (2013). Sediment displacement estimates are estimated in two different ways: (i) from a compilation of studies on local features (trough mouth fans, large-scale failures, and basin flux) and (ii) from output of a coupled ice-sediment model. To account for uncertainty in Earth's rheology, three viscosity profiles are used.It is found that sediment transport can lead to changes in relative sea level of up to 2 m in the last 6000 years and larger effects occurring earlier in the deglaciation. This magnitude is below the error level of most of the relative sea level data because those data are sparse and errors increase with length of time before present. The effect on present-day uplift rates reaches a few tenths of millimeters per year in large parts of Norway and Sweden, which is around the measurement error of long-term GNSS (global navigation satellite system) monitoring networks. The maximum effect on present-day gravity rates as measured by the GRACE (Gravity Recovery and Climate Experiment) satellite mission is up to tenths of microgal per year, which is larger than the measurement error but below other error sources. Since GISR causes systematic uplift in most of mainland Scandinavia, including GISR in GIA models would improve the interpretation of GNSS and GRACE observations there.

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Numerical modeling of glacial sediment production and transport during deglaciation

Cited by 24 publications

References 50 publications

Topographic controls on plateau icefield recession: insights from the Younger Dryas Monadhliath Icefield, Scotland

Topographic controls on plateau icefield recession: insights from the Younger Dryas Monadhliath Icefield, Scotland

Bedrock river incision response to basin connection along the Jinshan Gorge, Yellow River, North China

The effect of sediment loading in Fennoscandia and the Barents Sea during the last glacial cycle on glacial isostatic adjustment observations

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