A5037370654- Cryospheric studies and observations
- Geology and Paleoclimatology Research
- Landslides and related hazards
- Climate change and permafrost
- Winter Sports Injuries and Performance
- Mineralogy and Gemology Studies
- Geological formations and processes
- Geological Formations and Processes Exploration
- Marine and environmental studies
University of Wisconsin–Madison
2022-2024
Northwestern University
2020-2022
In fast-flowing regions of the Antarctic and Greenland ice sheets, most motion occurs through slip at boundary between its substrate. Glaciologists have developed “slip laws” that describe basal as a function resistive stress (e.g. drag) effective pressure. When implemented in sheet models, choice law affects predictions grounding-line migration sea-level rise. Slip laws models assume base glacier is “clean” (without rock debris) separated from bed by...
Glacial erosion shapes alpine landscapes, produces chemically reactive mineral surfaces integral to the carbon cycle, and informs glacier dynamics applied in ice sheet models. Quantifying primary bedrock has remained elusive due inaccessibility of ice-bed interface. Many estimates thereby rely on basin-wide sediment accumulation rates that can include reworked sediment, potentially causing overestimates glacial erosion. Here, we quantify using 60 paired cosmogenic situ 14C-10Be measurements...
Abstract Subglacial abrasion drives erosion for many glaciers, inundating forefields and proglacial marine environments with glaciogenic sediments. Theoretical treatments of this process suggest that bedrock rates scale linearly the energy expended through rock-on-rock friction during slip, but assumption lacks an empirical basis general implementation. To test approach, we simulated by sliding debris-laden ice over rock beds under subglacial conditions in a cryo-ring shear direct device....
Abstract Abrasion acts to smooth glacial terrains and leaves behind linear scratch-like features (striations) on bedrock landscapes. Striations are often used as measures of glacier flow directions, but their morphology can also provide information about the subglacial stress conditions that produced features. While striations abundant in field, processes create them be opaque hard examine situ because they occur under thick layers flowing ice. To alleviate difficulty for interpretation...