A5078681214- Cryospheric studies and observations
- Geology and Paleoclimatology Research
- Climate change and permafrost
- Landslides and related hazards
- Winter Sports Injuries and Performance
- Planetary Science and Exploration
- Polar Research and Ecology
- Paleontology and Stratigraphy of Fossils
- Arctic and Antarctic ice dynamics
- Geological formations and processes
- Astro and Planetary Science
- Space Exploration and Technology
- Evolution and Paleontology Studies
- Indigenous Studies and Ecology
- Peatlands and Wetlands Ecology
- Spaceflight effects on biology
- Rangeland Management and Livestock Ecology
- Invertebrate Taxonomy and Ecology
- Aeolian processes and effects
- Image Processing and 3D Reconstruction
- Geological Studies and Exploration
- Icing and De-icing Technologies
- Remote Sensing and LiDAR Applications
- Soil erosion and sediment transport
- Fire effects on ecosystems
Sheffield Hallam University
2016-2025
Geological Survey of Canada
2019
Natural Resources Canada
2019
Durham University
2013-2015
Queen Mary University of London
2014-2015
Royal Holloway University of London
2008
University of Reading
2007
Ice sheet flow is strongly influenced by the nature and quantity of meltwater entering subglacial system. Accessing monitoring contemporary drainage systems beneath ice sheets notoriously difficult, but it possible to utilise exposed beds palaeo-ice sheets. In particular, eskers record deposition in glacial channels are widespread on former However, unlike some other common landforms (e.g. drumlins) there have been relatively few attempts investigate quantify their characteristics at scale....
The configuration of subglacial meltwater is a critical control on ice sheet dynamics, and the presence pressurized water distributed across bed can induce dynamic instabilities. However, this process be offset by efficient evacuation within large channels, drainage systems beneath alpine glaciers have been shown to become increasingly channelized throughout melt season in response increased production meltwater. This seasonal evolution has recently inferred outlet Greenland Ice Sheet, but...
Abstract. We identify and map visible traces of subglacial meltwater drainage around the former Keewatin Ice Divide, Canada, from high-resolution Arctic Digital Elevation Model (ArcticDEM) data. find similarities in characteristics spatial locations landforms traditionally treated separately (i.e. channels, tracks eskers) propose that creating an integrated routes captures a more holistic picture large-scale this area. grouping channels under term corridor suggest these features order...
Eskers record the signature of channelised meltwater drainage during deglaciation providing vital information on nature and evolution subglacial drainage. In this paper, we compare spatial pattern eskers beneath former Laurentide Ice Sheet with routes diagnosed at discrete time intervals from results a numerical ice-sheet model. Perhaps surprisingly, show that predominantly occur in regions where modelled water flow is low. were found to typically match over distances < 10 km, most better...
Meltwater drainage systems beneath ice sheets are a poorly understood, yet fundamentally important environment for understanding glacier dynamics, which strongly influenced by the nature and quantity of meltwater entering subglacial system. Contemporary sub-ice sheet notoriously difficult to study, but we can utilise exposed beds palaeo-ice further our drainage. In particular, eskers record deposition in glacial channels widespread on former sheets. This paper presents 1:5,000,000 scale map...
Abstract This paper uses detailed mapping of eskers to address three questions which are important for reconstructing meltwater behaviour beneath contemporary and ancient ice masses: ‘What controls the morphology simple complex esker systems?’, ‘How do systems evolve through time?’ ‘Are patterns compatible with groundwater controlled hydraulic spacing tunnels?’. Esker crestlines widths mapped on Breiðamerkurjökull foreland eight time slices between 1945 2007, from high resolution (~50 cm)...
A hydrologically-active subglacial lake system has been identified near the south lateral margin of Isunnguata Sermia, West Greenland. Differencing time-stamped ArcticDEM strips revealed multiple anomalies in ice-surface elevation change. large hydrological drainage event from Sermia 2015 slowed ice flow for ~1 month and flooded foreland, depositing up to 8 meters sediment. Although proglacial flooding provided evidence that were likely caused by water bodies, satellite altimetry cannot...
Corridors of fast ice flow, streams, dominate the mass discharge contemporary sheets. Ice streams are points vulnerability for sheet instabilities, and so to understand past future change we need stream behaviour. Computer simulations can replicate position magnitude palaeo with some skill, but accurate projections confidence that simulated will evolve adjust a retreating in realistic manner. This is much harder constrain empirical evidence, there still considerable uncertainty regarding...
Mapped topographic features are important for understanding processes that sculpt the Earth's surface. This paper presents maps primary product of an exercise brought together 27 researchers with interest in landform mapping wherein efficacy and causes variation were tested using novel synthetic DEMs containing drumlins. The between interpreters (e.g. philosophy, experience) across study region woodland prevalence) opens these factors up to assessment. A priori known answers synthetics...
Continuity of sediment transfer through glacial systems is essential to maintain subglacial bedrock erosion, yet at temperate glaciers with overdeepened beds, where fluvial transport should be greatly limited by adverse slopes, remains poorly understood. Complex multiple processes in has been indicated the presence large frontal moraine systems, supraglacial debris mixed origin, thick basal ice sequences, and englacial thrusts eskers. At Svínafellsjökull, comprising decimetre-thick...
Abstract. We identify and map chains of esker beads (series aligned mounds) up to 15 m high on average ∼ 65 wide in central Nunavut, Canada, from the high-resolution (2 m) ArcticDEM. Based close 1 : association with regularly spaced, sharp-crested ridges interpreted as De Geer moraines, we interpret be quasi-annual ice-marginal deposits formed time-transgressively at mouth subglacial conduits during deglaciation. Esker therefore preserve a record ice-margin retreat hydrology. The...
Eskers are useful for reconstructing meltwater drainage systems of glaciers and ice sheets. However, our process understanding eskers suffers from a disconnect between sporadic detailed morpho‐sedimentary investigations abundant large‐scale ancient esker systems, small number modern analogues where formation has been observed. This paper presents the results field high‐resolution remote sensing studies into two that have recently emerged at Hørbyebreen, Svalbard, one Breiðamerkurjökull,...
Abstract Subglacial meltwater landforms found on palaeo‐ice sheet beds allow the properties of drainage to be reconstructed, informing our understanding modern‐day subglacial hydrological processes. In northern Canada and Fennoscandia, are largely organized into continental‐scale networks corridors (SMCs), interpreted as relics systems undergoing variations in input, effective pressure efficiency. We review current state knowledge bedforms (hummocks, ridges, murtoos, ribbed bedforms)...
We present a geomorphic map of Chukhung crater (38.47°N, 72.42°W) in central Tempe Terra, Mars. formed ~3.6–2.1 Ga, between the early Hesperian and Amazonian periods Mars' geologic history. It hosts dendritic networks wall valleys, broad floor mid- to late-Amazonian-aged debris-covered glaciers, moraine-like deposits, radial assemblage sinuous ridge landforms. explore origins landforms crater, focusing particular upon ridges. In northern ridges extend downslope from fluvial valley systems on...
Abstract. We report three active subglacial lakes within 2 km of the lateral margin Isunguata Sermia, West Greenland, identified by differencing time-stamped ArcticDEM strips. Each lake underwent one drainage–refill event between 2009 and 2017, with two draining in < 1 month August 2014 2015. The 2015 drainage caused a ∼ 1-month down-glacier slowdown ice flow flooded foreland, aggrading proglacial channel 8 m. flooding confirms ice-surface elevation anomalies as water bodies demonstrates...
This paper presents a glacial geomorphological map of lineations, ribbed terrain, moraines, meltwater channels (subglacial and ice-marginal/proglacial), eskers, glaciofluvial deposits, ice-contact outwash fans deltas abandoned shorelines on the bed former Laurentide Ice Sheet in northern Canada. Mapping was compiled from satellite imagery digital elevation data landforms were digitised directly into Geographical Information System. The reveals complex history characterised by multiple...
We present a systematic, metre-scale characterisation of the 3D morphometry an esker on Mars, and first attempt to reconstruct multi-stage dynamics formation Mars. Eskers are sinuous ridges comprising sediment deposited by meltwater draining through ice-confined tunnels within or beneath glaciers. Detailed morphometric insights into eskers Mars important for (i) informing tests whether elsewhere eskers, (ii) modelling experiments which aim glaciological environmental controls use digital...
Abstract Please click here to download the map associated with this article. Victoria Island lies at north-western extremity of region covered by vast North American Laurentide Ice Sheet (LIS) in Canadian Arctic Archipelago. This area is significant because it linked interior LIS Ocean, probably via a number ice streams. Island, however, exhibits remarkably complex glacial landscape, several successive generations flow indicators superimposed on top each other and often abrupt (90°) angles....
De Geer Moraines (DGM) and Crevasse-Squeeze Ridges (CSR) are important landforms that can provide useful insights regarding palaeo-glacial processes. Specifically, these information concerning ice-marginal dynamics, and/or subglacial processes, depending on the context in which they formed. The extraction of 3D morphometric data from ridges help to elucidate their formational potentially enable landform differentiation. We develop a new Python-based ArcGIS toolbox automatically extract large...