A5059000909- Cryospheric studies and observations
- Geology and Paleoclimatology Research
- Landslides and related hazards
- Polar Research and Ecology
- Winter Sports Injuries and Performance
- Climate change and permafrost
- Arctic and Antarctic ice dynamics
- Seismic Imaging and Inversion Techniques
- Soil Moisture and Remote Sensing
- Seismic Waves and Analysis
- Methane Hydrates and Related Phenomena
- Education, Sociology, Communication Studies
- Geographic Information Systems Studies
- Crystallization and Solubility Studies
- Global Maritime and Colonial Histories
- Information Technology Governance and Strategy
- Rock Mechanics and Modeling
- Aerospace Engineering and Energy Systems
- Geological Modeling and Analysis
- Educational Assessment and Pedagogy
- Space Exploration and Technology
- Precipitation Measurement and Analysis
- Complex Systems and Decision Making
- Soil and Unsaturated Flow
- Agriculture, Soil, Plant Science
British Antarctic Survey
2019-2025
University of Cambridge
2019-2025
Natural Environment Research Council
2019-2024
Dalhousie University
2024
International Centre for Integrated Mountain Development
2019-2022
Scientific Committee on Antarctic Research
2022
University of Tasmania
2019
CSIRO Land and Water
2019
ACT Government
2019
Central Queensland University
2019
Today, relatively warm Circumpolar Deep Water is melting Thwaites Glacier at the base of its ice shelf and grounding zone, contributing to significant retreat. Accelerating loss has been observed since 1970s; however, it unclear when this phase initiated. We analyzed marine sedimentary record reconstruct Glacier's history from early Holocene present. Marine geophysical surveys were carried out along floating ice-shelf margin identify core locations various geomorphic settings. use...
Abstract We present Bedmap3, the latest suite of gridded products describing surface elevation, ice-thickness and seafloor subglacial bed elevation Antarctic south 60 °S. Bedmap3 incorporates adds to all post-1950s datasets previously used for Bedmap2, including 84 new aero-geophysical surveys by 15 data providers, an additional 52 million points 1.9 line-kilometres measurement. These efforts have filled notable gaps in major mountain ranges deep interior East Antarctica, along West...
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,...
Seasonal snow is an important component of the Himalayan hydrological system, but a lack observations at high altitude hampers understanding and forecasting water availability in this region. Here, we use passive gamma ray sensor that measures equivalent (SWE) complementary meteorological instruments installed 4962 m a.s.l. Nepal Himalayas to quantify evolution SWE depth over two year period. We assess accuracy, spatial representativeness applicability measurements using time lapse camera...
Abstract. The geometry of the sea floor immediately beyond Antarctica's marine-terminating glaciers is a fundamental control on warm-water routing, but it also describes former topographic pinning points that have been important for ice-shelf buttressing. Unfortunately, this information often lacking due to inaccessibility these areas survey, leading modelled or interpolated bathymetries being used as boundary conditions in numerical modelling simulations. At Thwaites Glacier (TG) critical...
Snow dynamics play a crucial role in the hydrology of alpine catchments Himalaya. However, studies based on in-situ observations that elucidate energy and mass balance snowpack at high altitude this region are scarce. In study, we use meteorological snow two high-altitude sites Nepalese Himalaya to quantify seasonal snowpack. Using data driven experimental set-up aim understand main drivers snowmelt, illustrate importance accounting for cold content snowpack, gain insight into meltwater...
Abstract. Outburst floods from subglacial lakes beneath the Antarctic Ice Sheet modulate ice-flow velocities over periods of months to years. Although lake drainage events have been observed satellite-altimetric data, little is known about their role in long-term evolution ice-sheet basal hydrology. Here, we systematically map and model past water flow through an extensive area containing 1000 channels 19 former basins exposed on 000 km2 seafloor by retreat Pine Island Thwaites glaciers,...
Seasonal snow cover is an important source of melt water for irrigation and hydropower production in many regions the world, but can also be a cause disasters, such as avalanches floods. In remote Himalayan environment there great demand up-to-date information on conditions purposes planned development disaster risk reduction initiatives. We describe evaluate mapping setup Langtang Valley Nepal Himalayas, which deliver data availability all year round. The utilizes (1) robust almost...
Expanding multibeam bathymetric data coverage over the last two decades has revealed extensive networks of submarine channels incised into bedrock on Antarctic inner continental shelf. The large dimensions and prevalence implies presence an active subglacial hydrological system beneath past Ice Sheet which we can use to learn more about inaccessible processes. Here, map analyse 2700 situated across >100,000 km2 shelf in western Peninsula Amundsen Sea produce first inventory Morphometric...
Abstract Landforms produced beneath former ice sheets offer insights into inaccessible subglacial processes and present analogues for how current masses may evolve in a warming climate. Large channels cut by meltwater erosion (tunnel valleys [TVs]) have the potential to provide valuable empirical constraints numerical ice-sheet models concerning realistic melt rates, water routing, interplay between basal hydrology dynamics. However, information gleaned from these features has thus far been...
Abstract The subglacial hydrological system exerts a critical control on the dynamic behavior of overlying ice because its configuration affects degree basal lubrication between and bed. Yet, this component glaciological is notoriously hard to access observe, particularly over timescales longer than satellite era. In Antarctica, abundant evidence for past water flow former ice‐sheet beds exists around peripheries sheet including networks huge channels carved into bedrock (now submarine)...
Based on a regional 3D seismic data set and small high‐resolution (~40 km 2 ) we have mapped buried glacially eroded trough the North Sea Plateau, west of Norwegian Channel (latitude 59°N, longitude 3°E). The trough, which informally name Marstein Trough, is 60 long, 30 wide, 120 m deep, trends NE–SW. Trough contains an extensive pattern glacial lineations at its base, follow axis, infilled by two units interpreted as tills. From stratigraphical position, infer that was ice stream flowed...
Abstract. Basal hydrological systems play an important role in controlling the dynamic behaviour of ice streams. Data showing their morphology and relationship to geological substrates beneath modern streams are, however, sparse difficult collect. We present new multibeam bathymetry data that make Anvers-Hugo Trough west Antarctic Peninsula most completely surveyed palaeo-ice stream pathway Antarctica. The reveal a diverse range landforms, including streamlined features where there was fast...
Abstract. Benthic foraminiferal assemblages are useful tools for paleoenvironmental studies but rely on the calibration of live populations to modern environmental conditions allow interpretation this proxy downcore. In regions such as region offshore Thwaites Glacier, where relatively warm Circumpolar Deep Water is driving melt at glacier margin, it especially important have calibrated tracers different settings. However, Glacier difficult access, and therefore there a paucity data...
Abstract Understanding how regime shifts in iceberg calving behavior affect ice shelf stability remains a challenge for numerical models. This is an important question as we consider the fate of shelves that currently buttress Antarctic Ice Sheet and hold back bulk its potential upstream sea-level contribution. Using buried landforms, demonstrate fringed former British-Irish (BIIS) document their disintegration ~18,000 years ago. The produced massive (5–10 s km wide, 50–180 m thick) tabular...
Although the size-frequency distributions of icebergs can provide insight into how they disintegrate, our understanding this process is incomplete. Fundamentally, there a discrepancy between iceberg power-law observed at glacial calving fronts and lognormal globally within open waters that remains unexplained. Here we use passive seismic monitoring to examine mechanisms disintegration as function drift. Our results indicate shift in distribution sizes product fracture-driven dimensional...
Tunnel valleys are widespread in formerly glaciated regions such as the North Sea and record sediment transport beneath ice sheets undergoing deglaciation. However, their complex infill architecture often makes implications for ice-sheet processes difficult to unravel. Here, we use high resolution 3D (HR3D) seismic data, improved-resolution conventional seismic-reflection geotechnical information from industry-acquired boreholes image of buried Quaternary tunnel unprecedented detail. Ten...
Abstract. Outburst floods from subglacial lakes beneath the Antarctic Ice Sheet modulate ice flow velocities over periods of months to years. Although lake drainage events have been observed satellite altimetric data, little is known about their role in long term evolution sheet basal hydrology. Here, we systematically map and model past water through an extensive area containing 1000 channels 19 former basins exposed on 19,000 km2 seafloor by retreat Pine Island Thwaites glaciers, West...
Abstract Despite their importance for regional water resource planning and as indicators of climate change, records in situ glacier mass balance remain short spatially sparse the Himalaya. Here, we present an updated series mass-balance measurements from Rikha Samba Glacier, Nepal, between 2011 2021. The is −0.39 ± 0.32 m w.e. this period. We use energy-mass model to extend annual back 1974. forced using daily meteorological variables ERA5-Land reanalysis data that linearly bias-corrected...
Abstract. The geometry of the sea floor beyond Thwaites Glacier (TG) is a major control on routing warm ocean waters towards ice stream’s grounding zone, which has led to increased mass loss through sub-ice-shelf melting and resulting accelerated flow. Nearshore topographic highs act as pinning points for Ice Shelf potentially provide barriers water incursions. To date, few vessels have been able access this area due persistent sea-ice iceberg cover. This critical data gap was addressed in...
High-resolution 3D seismic data are used to analyse the infill of buried tunnel valleys in North Sea. The level detail provided by high-resolution three-dimensional (6.25 m bin size, ~4 vertical resolution) represents a step-change our ability investigate internal architecture and their role as geohazards. We discover that over 40 % examined contain glacial landforms including eskers, crevasse squeeze ridges, glacitectonic structures, kettle holes. Due association these features with shallow...
Abstract Ice shelves regulate the flow of Antarctic ice sheet toward ocean and its contribution to sea-level rise. Accurately monitoring basal surface melting is therefore essential for predicting sheet's response climatic warming. In this study, we utilize Sentinel-1A synthetic aperture radar satellite imagery combined with shipboard measurements water temperature salinity investigate presence surficial meltwater plumes along coastline. Our approach reveals a strong correlation between...
Abstract. Basal hydrological systems play an important role in controlling the dynamic behaviour of ice streams. Data showing their morphology and relationship to geological substrates beneath modern streams are, however, sparse difficult collect. We present new multibeam bathymetry data that make Anvers-Hugo Trough (AHT) west Antarctic Peninsula most completely surveyed palaeo-ice stream pathways Antarctica. interpret landforms as indicating subglacial water availability played facilitating...