A5035107092- Cryospheric studies and observations
- Winter Sports Injuries and Performance
- Arctic and Antarctic ice dynamics
- Landslides and related hazards
- Climate change and permafrost
- Smart Materials for Construction
- Hydrology and Watershed Management Studies
- Polar Research and Ecology
- Geophysics and Gravity Measurements
- Climate variability and models
- Atmospheric and Environmental Gas Dynamics
- Icing and De-icing Technologies
- Energy Efficient Wireless Sensor Networks
- Geology and Paleoclimatology Research
- Meteorological Phenomena and Simulations
- Environmental Monitoring and Data Management
- Oceanographic and Atmospheric Processes
- Radiomics and Machine Learning in Medical Imaging
- High Altitude and Hypoxia
- Climate Change and Health Impacts
- Energy Harvesting in Wireless Networks
- Water Quality Monitoring Technologies
- Hydrological Forecasting Using AI
- Synthetic Aperture Radar (SAR) Applications and Techniques
- Global Energy and Sustainability Research
Centre for Polar Observation and Modelling
2017-2024
University of Leeds
2017-2024
Northumbria University
2024
Jet Propulsion Laboratory
2021
University of Pittsburgh
2017-2018
Fluctuations in Antarctic Ice Sheet elevation and mass occur over a variety of time scales, owing to changes snowfall ice flow. Here we disentangle these signals by combining 25 years satellite radar altimeter observations regional climate model. From measurements, patterns change that are strongly associated with glaciological events emerge. While the majority sheet has remained stable, 24% West Antarctica is now state dynamical imbalance. Thinning Pine Island Thwaites glacier basins...
Abstract. We combine satellite observations and numerical models to show that Earth lost 28 trillion tonnes of ice between 1994 2017. Arctic sea (7.6 tonnes), Antarctic shelves (6.5 mountain glaciers (6.1 the Greenland sheet (3.8 (2.5 Southern Ocean (0.9 tonnes) have all decreased in mass. Just over half (58 %) loss was from Northern Hemisphere, remainder (42 Hemisphere. The rate has risen by 57 % since 1990s – 0.8 1.2 per year owing increased losses glaciers, Antarctica, shelves. During...
Abstract. Ice losses from the Greenland and Antarctic ice sheets have accelerated since 1990s, accounting for a significant increase in global mean sea level. Here, we present new 29-year record of sheet mass balance 1992 to 2020 Sheet Mass Balance Inter-comparison Exercise (IMBIE). We compare combine 50 independent estimates derived satellite observations temporal changes flow, volume, Earth's gravity field. Between 2020, contributed 21.0±1.9 mm level, with rate loss rising 105 Gt yr−1...
Abstract. The Earth climate system is out of energy balance, and heat has accumulated continuously over the past decades, warming ocean, land, cryosphere, atmosphere. According to Sixth Assessment Report by Working Group I Intergovernmental Panel on Climate Change, this planetary multiple decades human-driven results in unprecedented committed changes system, with adverse impacts for ecosystems human systems. inventory provides a measure imbalance (EEI) allows quantifying how much as well...
Abstract. We present a new digital elevation model (DEM) of the Antarctic ice sheet and shelves based on 2.5×108 observations recorded by CryoSat-2 satellite radar altimeter between July 2010 2016. The DEM is formed from spatio-temporal fits to measurements accumulated within 1, 2, 5 km grid cells, posted at modal resolution 1 km. Altogether, 94 % grounded 98 floating are observed, remaining cells north 88∘ S interpolated using ordinary kriging. median root mean square difference 2.3×107...
Abstract Runoff from the Greenland Ice Sheet has increased over recent decades affecting global sea level, regional ocean circulation, and coastal marine ecosystems, it now accounts for most of contemporary mass imbalance. Estimates runoff are typically derived climate models because satellite records have been limited to assessments melting extent. Here, we use CryoSat-2 altimetry produce direct measurements Greenland’s variability, based on seasonal changes in ice sheet’s surface...
Ice loss from the Greenland and Antarctic ice sheets currently contributes one third of global sea level rise, yet monitoring their complex coastal regions remains a challenge. One principal methods for determining sheet imbalance is satellite radar altimetry, which provides 30-year record surface elevation change. Over rugged topography, however, altimeter echo returned often complex, with multiple distinct reflections degrading accuracy measurements. Here, we present new processing...
Abstract The Getz region of West Antarctica is losing ice at an increasing rate; however, the forcing mechanisms remain unclear. Here we use satellite observations and sheet model to measure change in speed mass balance drainage basin over last 25-years. Our results show a mean increase 23.8 % between 1994 2018, with three glaciers accelerating by 44 %. Speedup across linear, speedup thinning directly correlated confirming presence dynamic imbalance. Since 1994, 315 Gt has been lost...
Abstract. Ice losses from the Greenland and Antarctic Sheets have accelerated since 1990s, accounting for a significant increase in global mean sea level. Here, we present new 29-year record of ice sheet mass balance 1992 to 2020 Sheet Mass Balance Inter-comparison Exercise (IMBIE). We compare combine 50 independent estimates derived satellite observations temporal changes flow, volume Earth’s gravity field. Between 2020, sheets contributed 21.0 ± 1.9 mm sea-level, with rate loss rising 105...
Abstract. Grounding line discharge is a key component of the mass balance Antarctic Ice Sheet. Here we present an estimate Sheet grounding from 1996 through to last month. We calculate ice flux at up 100 m resolution 16 algorithmically-generated gates, which are continuous around Antarctica. draw on range velocity and thickness data discharge. For thickness, use four bed topography datasets, two firn models temporally varying surface. velocity, utilise publicly-available maps resolutions...
Changes in firn properties affect the shape of pulse-limited radar altimeter echoes acquired over polar ice sheets. We apply a waveform deconvolution model to CryoSat-2 low-resolution mode determine depth distribution backscattering across Greenland Ice Sheet. The allows us calculate relative contributions surface and volume scattering effective penetration into snowpack. most prominent signal is associated with extreme melting summer 2012, which resulted shift dominant horizon toward snow...
Abstract. The Earth climate system is out of energy balance and heat has accumulated continuously over the past decades, warming ocean, land, cryosphere atmosphere. According to 6th Assessment Report Intergovernmental Panel on Climate Change, this planetary multiple decades human-driven results in unprecedented committed changes system, with adverse impacts for ecosystems human systems. inventory provides a measure imbalance, allows quantifying how much where stored. Here we show that 380 ±...
This study presents the latest updates to Audubon Society of Western Pennsylvania (ASWP) testbed, a $50,000 USD, 104-node outdoor multi-hop wireless sensor network (WSN). The collects environmental data from over 240 sensors, including EC-5, MPS-1 and MPS-2 soil moisture water potential sensors self-made sap flow across heterogeneous deployment comprised MICAz, IRIS TelosB motes. A low-cost board software driver was developed for communicating with analog digital sensors. Innovative...
Abstract Although fluctuations in ice sheet surface mass balance lead to seasonal and interannual elevation changes, it is unclear if they are resolved differently by radar laser satellite altimeters. We compare methods of computing change from CryoSat‐2 ICESat‐2 over the Greenland Ice Sheet assess their consistency quantify recent change. Solutions exist such that trends interior ablation zone agree within −0.2 ± 1.5 3.3 6.0 cm/yr, respectively, cycle amplitudes 3.5 38.0 cm. The agreement...
Abstract. We combine satellite observations and numerical models to show that Earth lost 28 trillion tonnes of ice between 1994 2017. Arctic sea (7.6 tonnes), Antarctic shelves (6.5 mountain glaciers (6.2 the Greenland sheet (3.8 (2.5 Southern Ocean (0.9 tonnes) have all decreased in mass. Just over half (60 %) loss was from northern hemisphere, remainder (40 southern hemisphere. The rate has risen by 57 % since 1990s – 0.8 1.2 per year owing increased losses glaciers, Antarctica, Greenland,...
Abstract. We present a new Digital Elevation Model (DEM) of the Antarctic ice sheet and shelves based on 2.5 × 108 observations recorded by CryoSat-2 satellite radar altimeter between July 2010 2016. The DEM is formed from spatio-temporal fits to elevation measurements accumulated within 1, 2 5 km grid cells, posted at modal resolution 1 km. Altogether, 94 % grounded 98 floating are observed, remaining cells North 88° S interpolated using ordinary kriging. median root mean square difference...
We present an empirical study on network dynamics in outdoor heterogeneous multi-hop WSN deployment for long-term environmental monitoring. analyze the three aspects, link level characteristics, routing and overall temporal characteristics. Our analysis provides insights including: (1) asymmetric links are majority networks which mainly caused by hardware heterogeneity; (2) protocol plays essential role generating addition to wireless dynamics. also create/compose benchmark profiles based...
Subglacial lakes beneath the Antarctic Ice Sheet were first identified using airborne radio-echo sounding (RES) surveys from 1960s. In Antarctica, 20% of 675 currently subglacial are “active,” exhibiting draining and filling behaviour as water flows through them. Clusters active often form in networks, connected by hydrological pathways which enable transfer between themselves. Signals this activity at ice base can be detected height changes sheet surface. Despite efforts...