A5041505081- Cryospheric studies and observations
- Winter Sports Injuries and Performance
- Arctic and Antarctic ice dynamics
- Climate change and permafrost
- Landslides and related hazards
- Geology and Paleoclimatology Research
- Methane Hydrates and Related Phenomena
- Polar Research and Ecology
- Adventure Sports and Sensation Seeking
- Additive Manufacturing Materials and Processes
- Icing and De-icing Technologies
- Additive Manufacturing and 3D Printing Technologies
- Hydrocarbon exploration and reservoir analysis
- Geological Studies and Exploration
- Social Robot Interaction and HRI
- High Entropy Alloys Studies
- Public Health Policies and Education
- Astro and Planetary Science
- Central Asia Education and Culture
- Innovative Educational Techniques
- Veterinary Pharmacology and Anesthesia
- Vacuum and Plasma Arcs
- Veterinary Practice and Education Studies
- Entomological Studies and Ecology
- Carbon Dioxide Capture Technologies
University of St Andrews
2022-2025
Goddard Space Flight Center
2013-2024
University of the District of Columbia
2023-2024
Hexagon (United States)
2024
North Carolina State University
2023
Kansas State University
2023
Royal Free London NHS Foundation Trust
2022
King's College Hospital NHS Foundation Trust
2022
Leukemia & Lymphoma Society of Canada
2020
Earth System Science Interdisciplinary Center
2013-2019
Abstract Ten ice-sheet models are used to study sensitivity of the Greenland and Antarctic ice sheets prescribed changes surface mass balance, sub-ice-shelf melting basal sliding. Results exhibit a large range in projected contributions sea-level change. In most cases, volume above flotation lost is linearly dependent on strength forcing. Combinations forcings can be closely approximated by summing from single forcing experiments, suggesting that nonlinear feedbacks modest. Our indicate more...
Thwaites Glacier, West Antarctica, has the potential to directly contribute ∼1 m sea level and currently is losing mass thinning rapidly. Here, we report on regional results for Sea‐level Response Ice Sheet Evolution (SeaRISE) experiments investigate impact of i) spatial resolution within existing data sets, ii) grounding‐zone processes, iii) till rheology dynamics this outlet glacier. In addition SeaRISE use detailed aerogeophysical satellite from Glacier as input a coupled ice...
Ocean-ice interactions have exerted primary control on the Antarctic Ice Sheet and parts of Greenland Sheet, will continue to do so in near future, especially through melting ice shelves calving cliffs. Retreat response increasing marine typically exhibits threshold behavior, with little change for forcing below but a rapid, possibly delayed shift reduced state once is exceeded. For Thwaites Glacier, West Antarctica, may already been exceeded, although rapid be by centuries, likely involve...
Abstract Atmospheric, oceanic, and subglacial forcing scenarios from the Sea‐level Response to Ice Sheet Evolution (SeaRISE) project are applied six three‐dimensional thermomechanical ice‐sheet models assess Antarctic ice sheet sensitivity over a 500 year timescale inform future modeling field studies. Results indicate (i) growth with warming, except within low‐latitude basins (where inland thickening is outpaced by marginal thinning); (ii) mass loss enhanced sliding (with dominated high...
Abstract The Sea‐level Response to Ice Sheet Evolution (SeaRISE) effort explores the sensitivity of current generation ice sheet models external forcing gain insight into potential future contribution sea level from Greenland and Antarctic sheets. All participating simulated response three types forcings: a change in oceanic condition, warmer atmospheric environment, enhanced basal lubrication. Here an analysis spatial is presented, impact model physics spin‐up on projections explored....
ABSTRACT Neighboring tidewater glaciers often exhibit asynchronous dynamic behavior, despite relatively uniform regional atmospheric and oceanic forcings. This variability may be controlled by a combination of local factors, including glacier fjord geometry, heat content circulation, surface melt. In order to characterize understand contrasts in adjacent dynamics, we made coincident ice-ocean-atmosphere observations at high temporal resolution (minutes weeks) within 10 000 km 2 area near...
Retrogressive slumping could accelerate sea-level rise if ice-sheet retreat generates ice cliffs much taller than observed today. The tallest cliffs, which extend roughly 100 m above sea level, calve only after ice-flow processes thin the to near flotation. Above some ice-cliff height limit, stress state in will satisfy material-failure criterion, resulting faster brittle failure. New terrestrial radar data from Helheim Glacier, Greenland, suggest that subaerial are prone failure by...
The stability of marine ice streams depends on the distribution as well magnitude melting beneath adjacent shelf, shown by new model results. Recent observations rapid retreat ice‐shelf grounding lines in Amundsen Sea sector West Antarctica have highlighted need for understanding how basal shelves warm ocean waters affects dynamics and potentially contributes indirectly to sea‐level rise. We apply two stream‐ice shelf flow line models investigate effects varying spatial grounding‐line...
[1] Rapid melting beneath the Ross Ice Shelf (RIS) occurs near ice front, likely in response to a secondary buoyant plume with tidal mixing, and is sensitive seasonal water temperatures front of shelf. The RIS examined using GLAS ICESat laser altimetry data. Spatial temporal changes surface elevations are attributed enhanced basal shelf front. Melt rates (b) increase exponentially as approached, from approximately zero at 40 km an average 2.8 ± 1.0 m a−1 within kilometer. estimates 60 best...
Abstract We used a terrestrial radar interferometer (TRI) at Helheim Glacier, Greenland, in August 2013, to study the effects of tidal forcing on terminal zone this tidewater glacier. During our period, glacier velocity was up 25 m d –1 . Our measurements show that moves out phase with semi-diurnal tides and densely packed melange fjord. Here detrended displacement lags behind forecasted height by ∼8 hours. The transition lag between happens within narrow (∼500 m) fjord front ice cliff. TRI...
Recovery Ice Stream has a substantial number of active subglacial lakes that are observed, with satellite altimetry, to grow and drain over multiple years. These store release water could be important for controlling the velocity ice stream. We apply hydrology model analyze lake growth drainage characteristics together simultaneous development stream hydrological network. Our outputs produce good match between modeled location those identified using altimetry many lakes. The system...
Abstract. The growth and drainage of active subglacial lakes in Antarctica has previously been inferred from analysis ice surface altimetry data. We use a hydrology model applied to synthetic Antarctic stream examine internal controls on the filling lakes. Our outputs suggest that highly constricted environment our idealized stream, combined with relatively high rates water flow funneled large catchment, can combine create system exhibiting slow-moving pressure waves. Over period years,...
Periodontitis triggers systemic repercussions, such as elevated levels of high-sensitive C-reactive protein (hs-CRP). This has never been studied within Parkinson's Disease (PD). The aim this study is to compare hs-CRP self-reported periodontitis cases versus without in PD patients. Data from the National Health and Nutrition Examination Survey (2015-2016 2017-2018 waves) were analyzed. identified through medication regimens a validated self-report questionnaire. 51 participants included (24...
Calving of glacial ice into the ocean from Greenland Ice Sheet is an important component global sea level rise. The calving process itself relatively poorly observed, understood, and modeled; as such, it represents a bottleneck in improving future estimates climate models. We organized pilot project to observe at Helheim Glacier East effort better understand it. During intensive one-week survey, we deployed suite instrumentation including terrestrial radar interferometer, GPS receivers,...
Ice shelf response to climate cycling introduces hysteretic behavior in outlet glaciers, with the evolution of meltwater drainage networks enhancing this effect. The 2002 collapse Larsen B ice (one floating extensions formed from glaciers flowing off Antarctic Peninsula into Weddell Sea) followed development widespread, poorly drained surface melt ponds during atypical warmth 2001–2002 summer season. Yet, for at least past half century, termini Greenland did not despite being exposed mean...
Tactile interaction is at the heart of human-robot relationships. The physical presence robot what distinguishes from human-virtual agent interaction. Although first attempts for tactile have been made, robots are still far inferior to abilities humans in providing experiences. This study investigates if a head massage given by others more pleasurable than oneself and simple significantly worse giving massage. Furthermore we investigate experience with changes participants' attitudes towards...
Abstract Thermodynamic flowline and plume models for the ice shelf–ocean system simplify ocean dynamics sufficiently to allow extensive exploration of parameters affecting ice-sheet stability while including key physical processes. Comparison between geophysically laboratory-based treatments ice–ocean interface thermodynamics shows reasonable agreement calculated melt rates, except where steep basal slopes relatively high temperatures are present. Results especially sensitive poorly known...
Stick-slip motion such as that observed at Whillans Ice Stream, West Antarctica, is one example of transient forcing significantly affecting longer-term ice-stream dynamics. We develop and present a two-dimensional map-plane viscoelastic model perturbations to dynamics suitable for simulating analyzing stick-slip behavior. Model results suggest important roles in both the elastic viscous components ice rheology, confirming extending inferences drawn from simple models observations. Elastic...
Few international studies have investigated factors affecting domiciliary non-invasive ventilation (D-NIV) compliance, and data from the UK are limited. We assessed compliance (defined as ≥ 4 h/night for at least 70% of time) in a retrospective population study, three time points (0-1 month, 3-4 months 11-12 months), all patients commenced on D-NIV over 5-year period. A total 359 were included. Non-compliant vs. compliant significantly younger (median age 64 (IQR 52-72) 67 (58-75) years, p =...