Neil F. Glasser

Aberystwyth University

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Michael J. Hambrey

Aberystwyth University

Stephan Harrison

University of Exeter

Bethan J. Davies

Newcastle University

Duncan J. Quincey

University of Leeds

Matthew R. Bennett

Bournemouth University

Krister N. Jansson

Stockholm University

John M. Reynolds

Aberystwyth University

David Huddart

Liverpool John Moores University

Tom Holt

Aberystwyth University

Bernd Kulessa

Swansea University

Cooperative Institutions

Aberystwyth University

Centre National de la Recherche Scientifique

Stockholm University

British Antarctic Survey

University of Edinburgh

Alfred-Wegener-Institut Helmholtz-Zentrum für Polar- und Meeresforschung

Chinese Academy of Sciences

University of Leeds

University of Exeter

ETH Zurich

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The glacial geomorphology of western Dronning Maud Land, Antarctica

Journal of Maps (2020)

Jennifer C. H. Newall Taisiya Dymova Elena Serra Robin Blomdin Ola Fredin

ABSTRACT Reconstructing the response of present-day ice sheets to past global climate change is important for constraining and refining the numerical models which forecast future contributions of these ice sheets to sea-level change. Mapping landforms is an essential step in reconstructing glacial histories. Here we present a new map of glacial landforms and deposits on nunataks in western Dronning Maud Land, Antarctica. Nunataks are mountains or ridges that currently protrude through the ice sheet and may provide evidence that they have been wholly or partly covered by ice, thus indicating a formerly more extensive (thicker) ice sheet. The map was produced through a combination of mapping from Worldview satellite imagery and ground validation. The sub-metre spatial resolution of the satellite imagery enabled mapping with unprecedented detail. Ten landform categories have been mapped, and the landform distributions provide evidence constraining spatial patterns of a previously thicker ice sheet.

Landform

Glacial landform

10.1080/17445647.2020.1761464

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Citations (7)

Medium Scale Landforms of Glacial Erosion in South Greenland; Process and Form

Geografiska Annaler Series A Physical Geography (1990)

Neil F. Glasser Charles R. Warren

Glacial erosion by plucking and abrasion is relatively well understood at the small scale of individual bed-forms several metres in dimension. Erosion at this scale is controlled by basal ice pressure, ice regelation and freeze/ thaw. Explanations are lacking for the formation of medium scale landforms of glacial erosion several hundred metres in dimension, where processes such as regelation and cavitation are less well understood.Study of a medium scale glacial erosional feature in South Greenland shows that the distribution of abraded and plucked surfaces is similar to that found on small scale features of glacial erosion. Polished surfaces are found on the stoss side of the larger feature, with plucked surfaces restricted to the lee side. Lateral cliffs have developed parallel to the ice movement direction, possibly related to the constricted flow of flanking ice.It is suggested that the distribution of these landforms of glacial erosion is related to the pressure fluctuations in basal ice developed over large bedrock obstacles. The processes important in the formation of medium scale features of glacial erosion are essentially small scale, but their relative dominance is controlled by meso - scale basal ice conditions.

Landform

Glacial landform

Bedrock

10.1080/04353676.1990.11880317

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Citations (29)

8.6 Water in Glaciers and Ice Sheets

Elsevier eBooks (2013)

Neil F. Glasser

10.1016/b978-0-12-374739-6.00195-0

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Citations (6)

?D-?¹⁸O relationships on a polythermal valley glacier: Midtre Lov�nbreen, Svalbard

Polar Research (2002)

Neil F. Glasser Michael J. Hambrey

This paper outlines the results of stable isotope (δD-δ 18 O) analysis of snow and glacier ice undertaken as part of a larger study concerning structural glaciology, debris entrainment and debris transport patterns at Midtre Lovénbreen, Svalbard.Samples of fresh snow were collected from the glacier surface in spring 1999 and samples of surface glacier ice and basal ice samples were collected in summer 1999.When plotted on bivariate co-isotopic diagrams (δD-δ 18 O), the slopes obtained for snow and unmodified glacier ice (6.4 and 6.9, respectively) are less steep than those for the basal ice layer and transverse ice layers on the ice surface (7.6 and 7.7, respectively).The difference in the slope of these lines is not statistically significant at the sample size (50) used in this study.The results indicate that although stable isotope analysis clearly has potential for studies of debris entrainment, transport and structural glaciology, difficulties remain with applying this technique.It is therefore not possible to apply these isotopic techniques to ice facies of unknown origins.In particular, large sample numbers are required to establish statistical differences and high-resolution sampling of specific ice facies may be necessary to establish isotopic differences.

10.1111/j.1751-8369.2002.tb00071.x

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Citations (1)

Glacial erosion and bedrock properties in NW Scotland: Abrasion and plucking, hardness and joint spacing

Geomorphology (2011)

Maarten Krabbendam Neil F. Glasser

Plucking

Bedrock

Abrasion (mechanical)

Landform

Schmidt hammer

10.1016/j.geomorph.2011.04.022

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Citations (94)

Karakoram glacier surge dynamics

Geophysical Research Letters (2011)

Duncan J. Quincey Matthias Braun Neil F. Glasser Michael P. Bishop K. Hewitt

We examine the surges of five glaciers in the Pakistan Karakoram using satellite remote sensing to investigate the dynamic nature of surges in this region and how they may be affected by climate.Surface velocity maps derived by feature-tracking quantify the surge development spatially in relation to the terminus position, and temporally with reference to seasonal weather.We find that the season of surge initiation varies, that each surge develops gradually over several years, and that maximum velocities are recorded within the lowermost 10 km of the glacier.Measured peak surge velocities are between one and two orders of magnitude greater than during quiescence.We also note that two of the glaciers are of a type not previously reported to surge.The evidence points towards recent Karakoram surges being controlled by thermal rather than hydrological conditions, coinciding with high-altitude warming from long-term precipitation and accumulation patterns.

10.1029/2011gl049004

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Citations (207)

10Be and 26Al exposure history of the highest mountains in Wales: Evidence from Yr Wyddfa (Snowdon) and Y Glyderau for a nunatak landscape at the global Last Glacial Maximum

Quaternary Science Reviews (2022)

Philip D. Hughes Neil F. Glasser David Fink

Bedrock

Last Glacial Maximum

10.1016/j.quascirev.2022.107523

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Citations (7)

The subglacial thermal organisation (STO) of ice sheets

Quaternary Science Reviews (2007)

Johan Klemån Neil F. Glasser

Ice divide

Landform

Fast ice

Pressure ridge

Ice tongue

Antarctic ice sheet

10.1016/j.quascirev.2006.12.010

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Citations (180)

Glacial landscapes of Britain and Ireland

Elsevier eBooks (2021)

Philip D. Hughes Chris D. Clark Philip L. Gibbard Neil F. Glasser Matt D. Tomkins

Wisconsin glaciation

Northern Ireland

Ice age

10.1016/b978-0-12-823498-3.00014-5

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Citations (1)

Glacigenic clast fabrics: genetic fingerprint or wishful thinking?

Journal of Quaternary Science (1999)

Matthew R. Bennett Richard I. Waller Neil F. Glasser Michael J. Hambrey David Huddart

The interpretation of glacigenic diamictons is a subjective process, for which quantitative support is frequently sought from parameters such as clast shape and fabric. It has been widely suggested that different glacigenic diamicton facies possess distinct clast-fabric signatures. This paper examines this concept using a data set of 111 clast fabrics, and a synthesis of published results. Eigenvalues are calculated and compared for a variety sedimentary facies. It is concluded that clast fabric alone is not able to discriminate between different glacigenic facies, and it is argued that clast fabric offers little quantitative support in the interpretation of glacigenic sediments. It is suggested, therefore, that although clast fabric may continue to have a role as an indicator of relative strain at specific sites, its use in the discrimination of glacigenic facies is limited. Consequently, we should be much more selective in undertaking such analyses in the future. Copyright © 1999 John Wiley & Sons, Ltd.

10.1002/(sici)1099-1417(199903)14:2<125::aid-jqs426>3.0.co;2-0

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Citations (119)