A5030601637- Cryospheric studies and observations
- Geology and Paleoclimatology Research
- Climate change and permafrost
- Landslides and related hazards
- Winter Sports Injuries and Performance
- Polar Research and Ecology
- Methane Hydrates and Related Phenomena
- Hydrology and Watershed Management Studies
- Arctic and Antarctic ice dynamics
- Geological Studies and Exploration
- Water Quality and Resources Studies
- Nuclear Physics and Applications
- Quantum, superfluid, helium dynamics
- Flood Risk Assessment and Management
- Paleontology and Stratigraphy of Fossils
- Soil erosion and sediment transport
- Icing and De-icing Technologies
- Plant Water Relations and Carbon Dynamics
- Geological and Geochemical Analysis
- High-pressure geophysics and materials
- Hydrology and Sediment Transport Processes
- Aeolian processes and effects
University of Sheffield
2015-2025
University of Glasgow
2002-2007
National Oceanic and Atmospheric Administration
1981
Abstract Glaciers are highly effective agents of erosion that have profoundly shaped Earth’s surface, but there is uncertainty about how glacial should be parameterised in landscape evolution models. Glacial rate usually modelled as a function glacier sliding velocity, the empirical basis for this relationship weak. In turn, climate assumed to control velocity and hence erosion, too lacks scrutiny. Here, we present statistically robust relationships between rates, velocities, from global...
Abstract Constraining the timescales of sediment transport by glacier systems is important for understanding processes controlling dynamics within glacierized catchments, and because accumulation supraglacial influences response to climate change. However, glacial can be difficult observe; transported englacially, subglacially, supraglacially or at ice margins, may stored temporarily on headwall slopes moraines before being (re‐)entrained ice. This study a proof concept use luminescence rock...
Glacier bed overdeepenings are ubiquitous in glacier systems and likely exert significant influence on ice dynamics, subglacial hydrology, stability. Understanding of overdeepening formation evolution has been hampered by an absence quantitative empirical studies their distribution morphology, with process insights having drawn largely from theoretical or numerical studies. To address this shortcoming, we first map the potential beneath Antarctic Greenland sheets using a GIS-based algorithm...
Abstract Proglacial suspended sediment transport was monitored at Haut Glacier d'Arolla, Switzerland, during the 1998 melt season to investigate mechanisms of basal evacuation by subglacial meltwater. Sub‐seasonal changes in relationships between and discharge demonstrate that structure hydraulics drainage system critically influenced how accessed entrained. Under hydraulically inefficient start season, availability generally high but increased relatively slowly with discharge. Later more...
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...
Ice loss from the Greenland Sheet (GrIS) is currently most significant single global contributor to barystatic sea level rise. The discharge of ice directly into ocean marine terminating glaciers cause approximately 40% this Understanding processes that control how slides over bed fundamental improving predictions future GrIS mass loss.Ice flow through major outlet dominates ocean, and often involves complexly overdeepened glacially eroded troughs. adverse slopes overdeepenings have...
Overdeepenings are erosional landforms, cut by glaciers into bedrock in basins and valleys. Overdeepening is the glaciological geomorphological process that produces these landforms. The overdeepening important because it has potential to influence response of ice masses climatic changes. In this paper, we analyze topographic bathymetric digital elevation models examine several hundred glacial overdeepenings Labrador, Canada. We investigate controls upon location depth overdeepenings. Our...
Abstract Surface energy-balance models are commonly used in conjunction with satellite thermal imagery to estimate supraglacial debris thickness. Removing the need for local meteorological data thickness estimation workflow could improve versatility and spatiotemporal application of estimation. We evaluate use regional reanalysis derive two mountain glaciers using a surface model. Results forced ERA-5 agree AWS-derived estimates within 0.01 ± 0.05 m Miage Glacier, Italy, 0.02 Khumbu Nepal....
Abstract Evacuation of basal sediment by subglacial drainage is an important mediator rates glacial erosion and glacier flow. Glacial patterns can produce closed basins (i.e., overdeepenings) in beds, thereby introducing adverse bed gradients that are hypothesized to reduce system efficiency thus favour accumulation. To establish how the presence a terminal overdeepening might mediate seasonal evolution export, we measured suspended transport from Findelengletscher, Switzerland during late...
Abstract Dispersed facies basal ice – massive (i.e. structureless) with dispersed debris aggregates is present at the margins of many glaciers and, as a product internal glacial processes, has potential to provide important information about mechanisms glacier flow and nature subglacial environment. The origin poorly understood, several hypotheses having been advanced for its formation, there disagreement whether it largely sedimentary or tectonic feature. We test these established temperate...
Abstract. Bed topography is a critical boundary for the numerical modelling of ice sheets and ice–ocean interactions. A persistent issue with existing products bed Greenland Ice Sheet surrounding sea floor poor representation coastal bathymetry, especially in regions floating near grounding line. Sparse data coverage, resultant coarse resolution at boundary, poses issues our ability to model flow advance retreat from present position. In addition, as fjord bathymetry known exert strong...
Proglacial icings (also known as naled or aufeis) are frequently observed in the forefields of polar glaciers. Their formation has been ascribed to refreezing upwelling groundwater that originated from subglacial melt, and thus presence used evidence polythermal glacier regime. We provide an updated analysis icing occurrence Svalbard test utility indicator thermal regime by comparing with: (1) mean thickness, a proxy for present regime; (2) past surge activity, which is A total 279 were...