C44A:
Advances in Understanding Processes at the Beds of Glaciers and Ice Sheets I


Submit an Abstract to this Session


Session ID#: 60696

Session Description:
The dynamic behavior of land-based and marine-terminating glaciers depends on processes at the ice-bed interface that are difficult to observe directly. However, these processes are crucial for understanding ice movement and the development of landscapes under past and future climates.

This session includes contributions that focus on glaciological, geomorphic, geochemical, and geobiological phenomena at glacier beds. Processes of interest include ice and bed deformation, basal slip, subglacial hydrology, subglacial erosion and sediment transport, development of subglacial landforms and stratigraphy, and microbial alteration of the basal environment, among others. We invite a range of approaches that address the spatiotemporal scales of these processes, including field and geophysical observations, laboratory experiments, sedimentological and morphometric studies, and modeling efforts.
Primary Convener:  Lucas Zoet, University of Wisconsin Madison, Department of Geoscience, Madison, United States
Conveners:  Winnie Chu, Stanford University, Department of Geophysics, Stanford, CA, United States, Knut A Christianson, University of Washington, Earth and Space Sciences, Seattle, United States and Neal R Iverson, Iowa State University, Geological and Atmospheric Sciences, Ames, IA, United States
Primary Liaison:  Lucas Zoet, University of Wisconsin Madison, Department of Geoscience, Madison, United States
Chairs:  Lucas Zoet, University of Wisconsin, Madison, Department of Geoscience, Madison, United States and Neal R Iverson, Iowa State univ, Ames, IA, United States
OSPA Liaison:  Winnie Chu, Georgia Institute of Technology Main Campus, Atlanta, United States
Index Terms:

0720 Glaciers [CRYOSPHERE]
0726 Ice sheets [CRYOSPHERE]
0774 Dynamics [CRYOSPHERE]
0776 Glaciology [CRYOSPHERE]

Abstracts Submitted to this Session:

Retreat dynamics of marine-based ice sheets: perspectives from diverse high-latitude continental margins (437966)
Lauren Miller Miller, University of Virginia, Department of Environmental Sciences, Charlottesville, United States, Lilja Rún Bjarnadóttir, MAREANO, Geological Survey of Norway, Trondheim, Norway, Sarah L. Greenwood, Stockholm University, Department of Geological Sciences, Stockholm, Sweden and Monica C M Winsborrow, NGU, Trondheim, Norway
Inferring the Sliding Law Exponent Using Time-Dependent Surface Velocity Observations (448657)
Brent M Minchew, Massachusetts Institute of Technology, Department of Earth, Atmospheric and Planetary Sciences, Cambridge, MA, United States
Sliding rule for glacier slip with cavities over a 3D bed (380019)
Christian Helanow1, Neal R Iverson1 and Lucas Zoet2, (1)Iowa State University, Geological and Atmospheric Sciences, Ames, IA, United States, (2)University of Wisconsin Madison, Department of Geoscience, Madison, United States
Freeze-on limits bed strength beneath sliding glaciers (450173)
Alan W Rempel1, Colin R Meyer1 and Anthony S. Downey2, (1)University of Oregon, Eugene, OR, United States, (2)Cal. State Northridge, Northridge, United States
Streaks of basal icequakes, subglacial geomorphology, and the evolving basal boundary of a major Antarctic ice stream (Invited) (416589)
Grace Barcheck, Cornell University, Earth and Atmospheric Sciences, Ithaca, United States, Slawek M Tulaczyk, University of California Santa Cruz, Earth and Planetary Sciences, Santa Cruz, United States and Susan Y Schwartz, University of California Santa Cruz, Earth and Planetary Sciences, Santa Cruz, CA, United States
Crystallographic Orientations in the Lateral Margin of Jarvis Glacier, Eastern Alaska Range (367682)
Christopher C Gerbi1, Stephanie G Mills1, Steven Bernsen1, Ian Lee2, Clemens-Sewall David3, Kate Hruby1, Seth W Campbell4, Robert L Hawley5, Renee Clavette4, Jacquelyn Bellefontaine1 and Karl J Kreutz6, (1)University of Maine, School of Earth and Climate Sciences, Orono, ME, United States, (2)Pennsylvania State University, Department of Geosciences, University Park, United States, (3)Dartmouth College, Thayer School of Engineering, Hanover, NH, United States, (4)University of Maine, Earth and Climate Sciences and Climate Change Institute, Orono, United States, (5)Dartmouth College, Department of Earth Sciences, Hanover, NH, United States, (6)University of Maine, School of Earth and Climate Sciences and Climate Change Institute, Orono, ME, United States
Magnitude and Timing of Glacial Erosional Processes Over Long Timescales from Cosmogenic Nuclides (Invited) (355249)
Brent M Goehring, Tulane University of Louisiana, Department of Earth and Environmental Sciences, New Orleans, LA, United States, Cari Rand, Tulane University of Louisiana, New Orleans, LA, United States and Keir Alexander Nichols, Tulane University of Louisiana, Department of Earth and Environmental Sciences, New Orleans, United States

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