A5079622706- Cryospheric studies and observations
- Geology and Paleoclimatology Research
- Landslides and related hazards
- Winter Sports Injuries and Performance
- Climate change and permafrost
- Arctic and Antarctic ice dynamics
- Polar Research and Ecology
- Geological formations and processes
- Methane Hydrates and Related Phenomena
- Pleistocene-Era Hominins and Archaeology
- Geological and Geochemical Analysis
- Hydrology and Sediment Transport Processes
- Geophysical Methods and Applications
- Geochemistry and Geologic Mapping
- Geography Education and Pedagogy
- Meteorological Phenomena and Simulations
- Geological Formations and Processes Exploration
- Paleontology and Stratigraphy of Fossils
- Wildlife Ecology and Conservation
- High Altitude and Hypoxia
- Music Technology and Sound Studies
- Icing and De-icing Technologies
- Geographic Information Systems Studies
- Time Series Analysis and Forecasting
- Integrated Water Resources Management
University of Sheffield
2015-2024
The BRITICE‐CHRONO consortium of researchers undertook a dating programme to constrain the timing advance, maximum extent and retreat British–Irish Ice Sheet between 31 000 15 years before present. campaign across Ireland Britain their continental shelves, North Sea included 1500 days field investigation yielding 18 km marine geophysical data, 377 cores sea floor sediments, geomorphological stratigraphical information at 121 sites on land; generating 690 new geochronometric ages. These...
ABSTRACT Mega‐scale glacial lineations (MSGLs) are a characteristic landform on ice stream beds. Solving the puzzle of their formation is key to understanding how interacts with its bed and this, in turn, influences dynamics streams. However, comprehensive detailed characterization this landform's size, shape spatial arrangement, which might serve test refine formational theories, largely lacking. This paper presents morphometric analysis comparison 4043 MSGLs from eight palaeo‐ice settings:...
During the last glaciation, most of British Isles and surrounding continental shelf were covered by British–Irish Ice Sheet ( BIIS ). An earlier compilation from existing literature BRITICE version 1) assembled relevant glacial geomorphological evidence into a freely available GIS geodatabase map (Clark et al . 2004: Boreas 33, 359). New high‐resolution digital elevation models, land seabed, have become casting landform record in new light highlighting shortcomings V.1 compilation. Here we...
Abstract Atmospheric warming is increasing surface melting across the Antarctic Peninsula, with unknown impacts upon glacier dynamics at ice-bed interface. Using high-resolution satellite-derived ice velocity data, optical satellite imagery and regional climate modelling, we show that drainage of meltwater to bed outlet glaciers on Peninsula occurs triggers rapid flow accelerations (up 100% greater than annual mean). This provides a mechanism for this sector Ice Sheet respond rapidly...
Understanding the evolution of ice-bed interface is fundamentally important for gaining insight into dynamics ice masses and how subglacial landforms are created. However, formation suite generated at this boundary — bedforms a contentious issue that yet to be fully resolved. Bedforms formed in aeolian, fluvial, marine environments either belong separate morphological populations or thought represent continuum forms by same governing processes. For bedforms, size shape has been hypothesised,...
The geological record of landforms and sediments produced beneath deglaciating ice sheets offers insights into inaccessible glacial processes. Large subglacial valleys formed by meltwater erosion (tunnel valleys) are widespread in formerly glaciated regions such as the North Sea. Obtaining a better understanding these features may help with parameterisation basal melt rates interplay between hydrology dynamics numerical models past, present, future ice-sheet configurations. However,...
Abstract Glacier and ice sheet retreat exposes freshly deglaciated terrain which often contains small‐scale fragile geomorphological features could provide insight into subglacial or submarginal processes. Subaerial exposure results in potentially rapid landscape modification even disappearance of the minor‐relief landforms as wind, weather, water vegetation impact on newly exposed surface. Ongoing many masses means there is a growing opportunity to obtain high resolution geospatial data...
Ice streams drain large portions of ice sheets and play a fundamental role in governing their response to atmospheric oceanic forcing, with implications for sea-level change. The mechanisms that generate stream flow remain elusive. Basal sliding and/or bed deformation have been hypothesized, but beds are largely inaccessible. Here we present comprehensive, multi-scale study the internal structure mega-scale glacial lineations (MSGLs) formed at palaeo stream. Analyses were undertaken macro-...
Ice stream evolution is a major uncertainty in projections of the future Greenland and Antarctic sheets. Accurate simulation ice requires an understanding number "ingredients" that control location behaviour flow. Here, we test influence geothermal heat flux, grid resolution, bed hydrology on simulated streaming. The palaeo-record provides snapshots evolution, with particularly well constrained sheet being British-Irish Sheet (BIIS). We implement new basal sliding scheme coupled...
Abstract Globally, glaciers and icefields contribute significantly to sea level rise. Here we show that ice loss from Juneau Icefield, a plateau icefield in Alaska, accelerated after 2005 AD. Rates of area shrinkage were 5 times faster 2015–2019 than 1979–1990. Glacier volume remained fairly consistent (0.65–1.01 km 3 −1 ) 1770–1979 AD, rising 3.08–3.72 1979–2010, then doubling 2010 reaching 5.91 ± 0.80 (2010–2020). Thinning has become pervasive across the since 2005, accompanied by glacier...
Abstract. The Greenland Ice Sheet is a large contributor to global sea level rise, and current mass losses are projected accelerate. However, model projections of future ice sheet evolution limited by the fact that not in equilibrium with present-day climate but still adjusting past changes occurred over thousands years. While influence such committed adjustments on remains unquantified, it could be addressed calibrating numerical models larger timescales and, importantly, against empirical...
This contribution documents the process of assessing quality data within a compilation legacy geochronological relating to last British-Irish Ice Sheet, task undertaken as part larger community-based project (BRITICE-CHRONO) that aims improve understanding ice sheet's deglacial evolution. As accurate reconstructions depend on available data, some form assessment is needed reliability and suitability each given age(s) in our dataset. We outline background considerations informed assurance...
ABSTRACT The findings of BRITICE‐CHRONO Transect 2 through the North Sea Basin and eastern England are reported. We define ice‐sheet marginal oscillation between ~31 16 ka, with seven distinctive former limits (L1–7) constrained by Bayesian statistical analysis. southernmost limit Lobe is recorded Bolders Bank Formation (L1; 25.8–24.6 ka). L2 represents early retreat to northern edge Dogger (23.5–22.2 ka), Garret Hill Moraine in north Norfolk recording a significant regional readvance L3 at...
ABSTRACT Reconstructions of palaeo‐sea level are vital for predicting future sea change and constraining palaeo‐ice sheet reconstructions, as well being useful a wide array applications across Quaternary Science. Previous reconstructions the Britain Ireland relied on circular tuning glacio‐isostatic models: input ice thicknesses extents were iteratively altered to fit relative data. Here we break that circularity by utilizing new data from BRITICE‐CHRONO project, which constrains position...
The Juneau Icefield, Alaska, lost ice at an accelerated rate after 2005, relative to the past 250 years. Rates of area shrinkage were found be 5 times faster from 2015–2019 than 1979–1990. continuation this trend could push glacial retreat beyond point possible recovery.Climate-driven loss glaciers and icefields has been shown contribute rising sea-levels, with Alaska expected remain largest regional contributor effect up year 2100. Alaskan are particularly vulnerable...
The food and water security of 90 million people depends on the Andean Mountain tower, which is at risk in several regions because climate change altering storage high altitude wetlands (bofedales), lakes, snow glacier ice. These features play a crucial role delaying release, particularly many semiarid with pronounced seasonal drought, sustaining baseflows quality. Changing availability impacts both pastoralist systems other productive downstream, including bigger cities inter-Andean...
Retreat patterns of past ice sheets such as the last Scandinavian Ice Sheet (SIS), which glaciated Fennoscandia and northern Europe, can be used to understand sheet dynamics in response climate warming. Many current reconstructions retreat have been conducted at local regional scales, difficult reconcile across sheet-scales, ice-sheet scale based on consistent approaches mapping data sources are rare. Recently available high-resolution topographic allowed a reassessment glacial landform...
Glacial landforms hold a wealth of information about the evolution large mid-latitude ice sheets during Quaternary. Streamlined subglacial lineations retain past flow, meltwater routes provide sheet hydrology, and ice-marginal that are eroded or deposited along glacier margins delineate former positions. Thus, rich landform records found on now-exposed beds ephemeral Pleistocene important archives palaeo-ice behaviour can be used to reconstruct sheets. Over few years, I have had privilege...
Loss of glacier ice is contributing substantially to rising sea levels, and negatively impacting up 1.9 billion people globally who rely on meltwater for agriculture, drinking water, hydropower other ecosystem services. Quantifying how glaciers are responding ongoing climate change therefore has far-reaching implications, though a global observational assessment this at an individual scale currently lacking. Here, we leverage the Randolph Glacier Inventory v7.0 (RGI) dataset...
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...
Both the Greenland and Antarctic ice sheets are experiencing increased levels of melt, contributing to potentially devastating sea level rise. Quantifying their future changes is imperative in order understand mitigate risks associated with demise. Projections sheet change due climate highly uncertain. Palaeo-ice left behind a wealth information on past extents, timing flow directions. By looking using such data validate constrain numerical model simulations, formulation approaches can be...
Meltwater from Andean glaciers sustains river flow heavily relied on by ecosystems and communities downstream, particularly during periods of drought. However, contemporary rates glacier recession in the Andes are accelerating yield freshwater high mountain environment here is forecast to decline coming decades, increasing water stress region. Water resource management policies rely robust hydrological modelling, which themselves require accurate, long-term records ice loss rates. Prior...
In August 2023, South America experienced one of the most extreme heatwave events ever recorded, marking warmest start to in 117 years with temperature anomalies 10–20°C above seasonal average. The impacted parts Chile, northern Argentina, and southwestern Brazil, temperatures Chilean Andes surpassing 38°C. Remote sensing images revealed widespread snowmelt across Andes, observations also suggested significant impacts on hydrological patterns, including spikes...