A5008074100- Cryospheric studies and observations
- Winter Sports Injuries and Performance
- Climate change and permafrost
- Arctic and Antarctic ice dynamics
- Landslides and related hazards
- Geology and Paleoclimatology Research
- Geological Studies and Exploration
- Methane Hydrates and Related Phenomena
- Atmospheric and Environmental Gas Dynamics
- Seismic Imaging and Inversion Techniques
- Polar Research and Ecology
The University of Texas at Austin
2014-2019
ICF International (United States)
2019
University of Texas Institute for Geophysics
2014-2016
Abstract Submarine melt can account for substantial mass loss at tidewater glacier termini. However, the processes controlling submarine are poorly understood due to limited observations of Here a in central West Greenland, we identify subglacial discharge outlets and infer across terminus using direct face. We find extensive melting associated with small outlets. While majority is routed single, large channel, not fed by tributaries drive rates excess 3.0 m d −1 85% total estimated...
Glacier terminus changes are one of the hallmarks worldwide glacier change, and thus, there is significant focus on controls limits to retreat in literature. Here we use observational record change from satellite remote sensing data characterize central West Greenland with a last 30 years. We compare observations glacier/fjord geometry available bed bathymetry find that accelerates through wide, overdeepened parts characterized by retrograde slopes. morphology overdeepening can be used as...
Abstract At tidewater glaciers, plume dynamics affect submarine melting, fjord circulation, and the mixing of meltwater. Models often rely on buoyant theory to parameterize plumes melting; however, these parameterizations are largely untested due a dearth near‐glacier measurements. Here we present high‐resolution ocean survey by ship remotely operated boat near terminus Kangerlussuup Sermia in west Greenland. These novel observations reveal 3‐D structure transport near‐surface plume,...
Abstract The majority of Greenland tidewater glaciers undergo a seasonal cycle in terminus position, characterized by wintertime advance and summertime retreat. Understanding mechanisms that control cycles can help elucidate how regulate dynamic ice loss on longer timescales. However, controls position are numerous complex. To address this, we compare time series satellite‐derived positions for central west with observations environmental forcings, including runoff at the grounding line,...
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...
Abstract Calving and submarine melt drive frontal ablation sculpt the ice face of marine‐terminating glaciers. However, there are sparse observations termini, which limit estimates spatially varying melt. Here we present a detailed survey west Greenland glacier to reveal heterogeneity in terminus morphology. We find that majority (~77%) is undercut, driven by calving upper water column melting at depth. The remaining ~23% overcut, alone. use six subglacial discharge outlets, combined with...
Abstract At both corners of the now stagnant Kamb Ice Stream (KIS, West Antarctica) outlet, shear margins different ages confine wedge-shaped areas with relatively flat, smooth surfaces that stagnated before main trunk ice stream. We identify these features as lakes or past lakes, and consider scenarios for their development in a regional history ongoing adjustment to grounding-line position. focus here on centuries leading up recent stagnation KIS, time when its grounding line appears have...