A5072228582- Cryospheric studies and observations
- Methane Hydrates and Related Phenomena
- Arctic and Antarctic ice dynamics
- Geology and Paleoclimatology Research
- Geological formations and processes
- Underwater Acoustics Research
- Climate change and permafrost
- Winter Sports Injuries and Performance
- Geological Modeling and Analysis
- Coastal and Marine Dynamics
- Hydrocarbon exploration and reservoir analysis
- Atmospheric and Environmental Gas Dynamics
- Marine and environmental studies
- Underwater Vehicles and Communication Systems
- Geochemistry and Elemental Analysis
- Geochemistry and Geologic Mapping
- Target Tracking and Data Fusion in Sensor Networks
- Oceanographic and Atmospheric Processes
- Aquatic and Environmental Studies
- Fish Ecology and Management Studies
- Soil erosion and sediment transport
- Geological Studies and Exploration
- Robotics and Sensor-Based Localization
- Groundwater flow and contamination studies
- Icing and De-icing Technologies
The University of Texas at Austin
2015-2025
University of Texas Institute for Geophysics
2019
Tulane University
2004
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...
Underwater melting How fast does warm ocean water melt glaciers that terminate in the sea? That question is central to understanding how ice sheets may lose mass, and thus sea level will rise, response global warming, but there are few data about process. Sutherland et al. used repeat multibeam sonar surveys observe an Alaskan subsurface tidewater glacier face create a time series of its calving patterns. They observed rates up hundred times larger than those predicted by theory,...
Abstract Marine‐terminating glaciers play a critical role in controlling Greenland's ice sheet mass balance. Their frontal margins interact vigorously with the ocean, but our understanding of this interaction is limited, part, by lack bathymetry data. Here we present multibeam echo sounding survey 14 glacial fjords Uummannaq and Vaigat fjords, west Greenland, which extends from continental shelf to glacier fronts. The data reveal valleys shallow sills, overdeepenings (>1300 m) erosion,...
Abstract Increasing freshwater input to the subpolar North Atlantic through iceberg melting can influence fjord‐scale basin‐scale ocean circulation. However, magnitude, timing, and distribution of this have been challenging quantify due minimal direct observations subsurface geometry melt rates. Here we present novel in situ methods capturing change at high‐temporal ‐spatial resolution using four high‐precision GPS units deployed on two large icebergs (>500 m length). In combination with...
Abstract Frontal ablation, the combination of submarine melting and iceberg calving, changes geometry a glacier's terminus, influencing glacier dynamics, fate upwelling plumes distribution meltwater input into ocean. Directly observing frontal ablation terminus morphology below waterline is difficult, however, limiting our understanding these coupled ice–ocean processes. To investigate evolution tidewater we combine 3-D multibeam point clouds subsurface ice face at LeConte Glacier, Alaska,...
We have investigated the impact of Hurricane Ike on shoreface Bolivar Peninsula, Texas, using three near-surface marine geophysical surveys during a five-year span following storm, which made landfall in September 2008. Multibeam bathymetry, sidescan backscatter, and CHIRP subbottom reflection data were collected each survey. The first survey, November, 2008, discovered presence an erosional, landward-facing scarp across broad barrier spit at approximately 3.5-m water depth. erosion incised...
Abstract Sedimentary processes are known to help facilitate tidewater glacier advance, but their role in modulating retreat is uncertain and poorly quantified. In this study we use repeated seafloor bathymetric surveys satellite‐derived terminus positions from LeConte Glacier, Alaska, evaluate the evolution of a morainal bank related changes dynamics over 17‐year period. The experienced rapid between 1994 1999, before stabilizing at constriction fjord. Since then, has remained stabilized...
This paper proposes a systems level solution for addressing the problem of mapping large moving targets with slow but complicated dynamics. Our approach utilizes complementary nature multiple sensing modalities. While this work is applicable to other domains we focus our efforts on rotating and translating icebergs. involves rigidly coupled combination line scan sensor - subsurface multibeam sonar, an area optical camera. allows system exploit camera information perform iceberg relative...