A5054331890- Cryospheric studies and observations
- Winter Sports Injuries and Performance
- Arctic and Antarctic ice dynamics
- Climate change and permafrost
- Geology and Paleoclimatology Research
- Landslides and related hazards
- Polar Research and Ecology
- Climate variability and models
- Methane Hydrates and Related Phenomena
- Healthcare Systems and Challenges
- Geophysics and Sensor Technology
- Smart Materials for Construction
- Urban Green Space and Health
- Adventure Sports and Sensation Seeking
- Psychology of Social Influence
- Team Dynamics and Performance
- Geophysics and Gravity Measurements
- Ecosystem dynamics and resilience
- Geological Studies and Exploration
- Diverse Educational Innovations Studies
- Marine and coastal ecosystems
- Geochemistry and Elemental Analysis
- Meteorological Phenomena and Simulations
- Advanced Data Processing Techniques
- Environmental Education and Sustainability
Northumbria University
2020-2024
King's College London
2023
University of Exeter
2020-2021
Newcastle University
2017-2020
Scottish Association For Marine Science
2018
Abstract. The Greenland Ice Sheet (GrIS) is losing mass in response to recent climatic and oceanic warming. Since the mid-1990s, tidewater outlet glaciers across ice sheet have thinned, retreated, accelerated, but changes northern been comparatively understudied. Consequently, dynamic (i.e. surface elevation velocity) of these at their termini, particularly calving from floating tongues, poorly constrained. Here we use satellite imagery historical maps produce an unprecedented 68-year record...
Abstract. Marine-terminating outlet glacier terminus traces, mapped from satellite and aerial imagery, have been used extensively in understanding how glaciers adjust to climate change variability over a range of timescales. Numerous studies digitized termini manually, but this process is labor intensive, no consistent approach exists. A lack coordination leads duplication efforts, particularly for Greenland, which major scientific research focus. At the same time, machine learning...
Abstract. Observations of ocean-driven grounding-line retreat in the Amundsen Sea Embayment Antarctica raise question an imminent collapse West Antarctic Ice Sheet. Here we analyse committed evolution grounding lines under present-day climate. To this aim, first calibrate a sub-shelf melt parameterization, which is derived from ocean box model, with observed and modelled sensitivities to temperature changes, making it suitable for simulations future sea level projections. Using new...
Abstract. Theoretical and numerical work has shown that under certain circumstances grounding lines of marine-type ice sheets can enter phases irreversible advance retreat driven by the marine sheet instability (MISI). Instances such have been found in several simulations Antarctic Ice Sheet. However, it not assessed whether are already undergoing MISI their current position. Here, we conduct a systematic stability analysis using three state-of-the-art models: Úa, Elmer/Ice, Parallel Sheet...
Seawater rare earth element (REE) concentrations are increasingly applied to reconstruct water mass histories by exploiting relative changes in the distinctive normalised patterns. However, mechanisms which masses gain their patterns yet be fully explained. To examine this, we collected samples along Extended Ellett Line (EEL), an oceanographic transect between Iceland and Scotland, measured dissolved REE offline automated chromatography (SeaFAST) ICP-MS. The proximity two continental...
Abstract. Observations of ocean-driven grounding line retreat in the Amundsen Sea Embayment Antarctica give rise to question a collapse West Antarctic Ice Sheet. Here we analyse committed evolution lines under present-day climate conditions locate underlying steady states that they are attracted and understand reversibility large-scale changes. To this aim, first calibrate sub-shelf melt module PICO with observed modelled sensitivities ocean temperature Using new calibration, run an ensemble...
Abstract. The Greenland Ice Sheet contributed 10.6 mm to global sea level rise between 1992 and 2018, it is projected be the largest glacial contributor by 2100. Here we assess relative importance of two major sources uncertainty in 21st century ice loss projections: (1) choice sliding law (2) surface mass balance (SMB) forecast. Specifically, used flow model Úa conduct an ensemble runs for 48 combinations SMB forecast three outlet glaciers (Kangerlussuaq (KG), Humboldt (HU) Petermann (PG)...
Abstract. The future of the Antarctic Ice Sheet in response to climate warming is one largest sources uncertainty estimates changes global mean sea level (ΔGMSL). Mass loss currently concentrated regions warm circumpolar deep water, but it unclear how ice shelves surrounded by relatively cold ocean waters will respond climatic future. Studies suggest that water could flush Filchner–Ronne (FR) shelf cavity during 21st century, inland sheet a drastic increase melt rates poorly known. Here, we...
Bridging the knowledge gap between recent decades and preceding centuries of Greenland Ice Sheet (GrIS) history is essential for improving projections its contribution to future sea-level rise. Evidence from relative reconstructions salt marshes in southern suggests that GrIS mass loss began around 1850, well before significant anthropogenic warming—a pattern not yet captured existing simulations late Holocene evolution. Extending surface balance (SMB) as far back possible, by...
Abstract. Dynamic ice discharge from outlet glaciers across the Greenland Ice Sheet has increased since beginning of 21st century. Calving floating tongues that buttress these outlets can accelerate flow and grounded ice. However, little is known about dynamic impact tongue loss in compared to shelf collapse Antarctica. The rapidly flowing (∼1000 m a−1) Petermann Glacier northwest one sheet's last remaining tongues, but it lost ∼50 %–60 % (∼40 km length) this via two large calving events...
Abstract Ice shelves restrain flow from the Greenland and Antarctic ice sheets. Climate-ocean warming could force thinning or collapse of floating subsequently accelerate flow, increase discharge raise global mean sea levels. Petermann Glacier (PG), northwest Greenland, recently lost large sections its shelf, but response to total shelf loss in future remains uncertain. Here, we use model Úa assess sensitivity PG changes extent, estimate resultant grounded contribution level rise. Our...
Abstract. Theoretical and numerical work has firmly established that grounding lines of marine-type ice sheets can enter phases irreversible advance retreat driven by the marine sheet instability (MISI). Instances such have been found in several simulations past future evolution Antarctic Ice Sheet. However, hitherto stability regime Sheet their current position not assessed. Here we conduct a systematic analysis all to determine if they are currently undergoing through MISI. To do this,...
Abstract. Marine-terminating outlet glacier terminus traces, mapped from satellite and aerial imagery, have been used extensively in understanding how glaciers adjust to climate change variability over a range of time scales. Numerous studies digitized termini manually, but this process is labor-intensive, no consistent approach exists. A lack coordination leads duplication efforts, particularly for Greenland, which major scientific research focus. At the same time, machine learning...
Abstract. Recent satellite data have revealed widespread grounding line retreat, glacier thinning, and associated mass loss along the Bellingshausen Sea sector, leading to increased concern for stability of this region Antarctica. While satellites greatly improved our understanding surface conditions, a lack radio-echo sounding (RES) in has restricted analysis subglacial topography, ice thickness, flux. In paper we analyse 3000 km 150 MHz airborne RES collected using PASIN2 radar system...
Abstract. The future of the Antarctic Ice Sheet in response to climate warming is one largest sources uncertainty estimates changes global mean sea level (∆GMSL). Mass loss currently concentrated regions warm circumpolar deep water, but it unclear how ice shelves surrounded by relatively cold ocean waters will respond climatic future. Studies suggest that water could flush Filchner-Ronne (FR) shelf cavity during 21st century, inland sheet a drastic increase melt rates, poorly known. Here, we...
Abstract. Dynamic ice discharge from outlet glaciers across the Greenland sheet has increased since beginning of 21st century. Calving floating tongues that buttress these outlets can accelerate flow and grounded ice. However, little is known about dynamic impact tongue loss in compared to shelf collapse Antarctica. The rapidly flowing (∼ 1000 m a−1) Petermann Glacier north-west one sheet's last remaining tongues, but it lost ∼ 50–60 % 40 km length) this via two large calving events 2010...
Abstract. The Greenland Ice Sheet (GrIS) is losing mass in response to recent climatic and oceanic warming. Since the mid-1990s, marine-terminating outlet glaciers across GrIS have retreated, accelerated thinned, but changes northern been comparatively understudied. Consequently, dynamic (i.e. surface elevation velocity) of these at their termini, particularly calving from floating ice tongues, remains unknown. Here we use satellite imagery historical maps produce an unprecedented 68-year...
Changes in ocean conditions surrounding the Antarctic ice sheet, and impact on melt rates beneath buttressing shelves, is one of largest sources uncertainty future loss projections. If were to suddenly undergo a regime-shift from cold warm, could increase drastically trigger large potentially irreversible changes interior sheet. Here, we take an ensemble ocean-circulation model as input ice-sheet model, quantify potential for retreat under such warm conditions. We find that currently...
Many tidewater glaciers in Greenland terminate near-vertical ice cliffs from which icebergs calve. Marine Ice Cliff Instability (MICI) is the hypothesis that above a subaerial cliff height limit, tensile or shear stresses at glacier terminus surpass yield strength, causing catastrophic failure and self-sustaining frontal retreat as sequentially taller are exposed. Previous modelling studies have proposed this threshold least 100 m, with estimated thresholds including m 110 for damaged ice,...
Proglacial lakes often form due to the availability of meltwater at a glacier margin. The greatest increase in proglacial lake area and volume is currently occurring Arctic. This research quantified annual change seasonal variations colour Múlajökull outlet southeast Hofsjökull. Normalised Difference Water Index used calculate between 1987 2021 Google Earth Engine. As terminus has retreated, number increased. been most noticeable after year 2000 following which,...
<p>Mass loss from the Antarctic Ice Sheet is main source of uncertainty in projections future sea-level rise, with important implications for coastal regions worldwide. Enhanced melt beneath ice shelves could destabilise large parts sheet, and further increase loss. Despite advances our understanding feedbacks sheet-ice shelf-ocean system, remain poorly constrained many Antarctica. In particular, there ongoing debate surrounding Filchner-Ronne Shelf (FRIS) region. The FRIS has...