A5017178543- 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
- Hydrocarbon exploration and reservoir analysis
- Methane Hydrates and Related Phenomena
- Polar Research and Ecology
- Indigenous Studies and Ecology
- Climate variability and models
- Rangeland and Wildlife Management
- Geological Studies and Exploration
- Atmospheric and Environmental Gas Dynamics
Earth and Space Research
2013-2018
University of Washington
2013-2018
Johns Hopkins University Applied Physics Laboratory
2017-2018
University of Washington Applied Physics Laboratory
2015-2016
Victoria University of Wellington
2012-2015
Dartmouth College
2011-2014
University of Colorado Boulder
2013
Abstract The dynamic response of Greenland tidewater glaciers to oceanic and atmospheric change has varied both spatially temporally. While some this variability is likely related regional climate signals, glacier geometry also appears be important. In study, we investigated the environmental geometric controls on seasonal interannual evolution Helheim Kangerlussuaq Glaciers, Southeast Greenland, from 2008 2016, by combining year‐round, satellite measurements terminus position, velocity,...
A firn aquifer in the Helheim Glacier catchment of Southeast Greenland lies directly upstream a crevasse field. Previous measurements show that 3.5-km long segment lost large volume water (26,000 – 65,000 m2 cross section) between spring 2012 and 2013, compared to annual meltwater accumulation 6000 15,000 m2. The is thought have entered crevasses, but whether reached bed or refroze within ice sheet unknown. We used thermo-visco-elastic model for propagation calculate depths volumes these...
Abstract Accumulation is a key parameter governing the mass balance of Greenland ice sheet. Several studies have documented spatial variability accumulation over wide scales, primarily using point data, remote sensing or modeling. Direct measurements spatially extensive, detailed profiles in Greenland, however, are rare. We used 400 MHz ground-penetrating radar along 1009 km route Inland Traverse from Thule to Summit during April and May 2011, image continuous internal reflecting horizons....
Abstract Tidewater glaciers deposit sediment at their terminus, thereby reducing the relative water depth. Reduced depth can lead to increased glacier stability through decreased rates of iceberg calving, thinning and submarine melting. Here we investigate sedimentation processes termini Kronebreen Kongsvegen, Svalbard. We mapped fjord floor bathymetry in August 2009 calculate based on our that from a similar study 2005. A grounding-line fan is developing near current position subglacial...
Abstract The current ice core record extends back 800,000 years. Geologic and glaciological evidence suggests that the Allan Hills Blue Ice Area, East Antarctica, may preserve a continuous further in time. In this study, we use ice‐penetrating radar existing age constraints to map internal stratigraphy structure of Main Field. dated isochrones provide for an flow model estimate near bed. Previous drilling region recovered stratigraphically disturbed sections up 2.7 million years old. Our...
Abstract Mass loss from mountain glaciers contributes to sea-level rise and reduces freshwater availability in glacier-fed river basins, with negative effects on hydropower generation, agriculture the health of aquatic ecosystems. In this study, we determine volume lower Peyto Glacier, Alberta, Canada, ground-penetrating radar surveys 2008–10, compare our estimate previous estimates 1966 1984. The long-term record mass-balance Glacier highlights Peyto’s importance as an ‘index’ glacier for...
Abstract Short-term glacier velocity variations typically occur when a water input is accommodated by an increase in the subglacial pressure. Although these have been well documented on many glaciers, few studies considered them glaciers where heavy rain and melt year-round. This study investigates relationship between inputs Franz Josef Glacier, New Zealand. We installed six GNSS stations across lower during austral summer 2010/11 one station 2012/13. Glacier remained elevated at all for ∼7...
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