C21D:
Advances in Understanding Processes at the Beds of Glaciers and Ice Sheets I

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Session ID#: 17509

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 to 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 addresses the spatiotemporal scales of these processes, including field and geophysical observations, laboratory experiments, sedimentological and morphometric studies, and modeling efforts.
Primary Convener:  Matthew Siegfried, University of California San Diego, La Jolla, CA, United States
Conveners:  Lucas Zoet, University of Wisconsin Madison, Department of Geoscience, Madison, United States, Knut A Christianson, University of Washington, Seattle, WA, United States and Neal R Iverson, Iowa State University, Geological and Atmospheric Sciences, Ames, IA, United States
Chairs:  Lucas Zoet, University of Wisconsin Madison, Department of Geoscience, Madison, United States and Neal R Iverson, Iowa State University, Geological and Atmospheric Sciences, Ames, IA, United States
OSPA Liaison:  Knut A Christianson, University of Washington, Seattle, WA, United States

Cross-Listed:
  • EP - Earth and Planetary Surface Processes
  • H - Hydrology
  • NS - Near Surface Geophysics
Index Terms:

0726 Ice sheets [CRYOSPHERE]
0774 Dynamics [CRYOSPHERE]
0776 Glaciology [CRYOSPHERE]
0790 Weathering [CRYOSPHERE]

Abstracts Submitted to this Session:

A linked lake system beneath Thwaites Glacier, West Antarctica reveals an efficient mechanism for subglacial water flow. (181422)
Benjamin Eaton Smith, University of Washington Seattle Campus, Seattle, WA, United States, Noel Gourmelen, University of Edinburgh, School of GeoSciences, Edinburgh, EH9, United Kingdom, Alexander Huth, Applied Physics Laboratory University of Washington, Seattle, United States and Ian R Joughin, Applied Physics Laboratory University of Washington, Seattle, WA, United States
Sub-seasonal pressure, geometry and sediment transport changes observed in subglacial channels from the analysis of seismic ground motion (Invited) (120061)
Florent Gimbert, CalTech Seismological Laboratory, Pasadena, CA, United States; Helmholtz Centre Potsdam GFZ German Research Centre for Geosciences, Potsdam, Germany, Victor C Tsai, California Institute of Technology, Seismological Laboratory, Pasadena, CA, United States, Jason M Amundson, University of Alaska Southeast, Department of Natural Sciences, Juneau, United States, Timothy C Bartholomaus, University of Texas at Austin, Austin, TX, United States and Jacob I. Walter, University of Texas at Austin, Institute for Geophysics, Austin, TX, United States
Bed Conditions Inferred from Basal Earthquakes Beneath the Whillans Ice Plain, West Antarctica (161900)
Grace Barcheck1, Chloe Boucher2, Susan Y Schwartz3 and Slawek M Tulaczyk3, (1)Cornell University, Earth and Atmospheric Sciences, Ithaca, NY, United States, (2)University of California Santa Cruz, Santa Cruz, CA, United States, (3)University of California Santa Cruz, Earth and Planetary Sciences, Santa Cruz, CA, United States
Poro-elastic Properties of Whillan’s Ice Stream Till: Implications for Basal Stick-Slip (168069)
John Leeman, Leeman Geophysical, Siloam Springs, United States, Robert D Valdez, Pennsylvania State University, University Park, PA, United States, Richard B Alley, Pennsylvania State University Main Campus, Geosciences, University Park, PA, United States, Sridhar Anandakrishnan, Pennsylvania State University, Department of Geosciences and Earth and Environmental Systems Institute, University Park, United States and Demian M Saffer, The University of Texas at Austin, Austin, United States
Subglacial sediment mechanics investigated by computer simulation of granular material (Invited) (118233)
Anders Damsgaard1, David L Egholm2, Slawek M Tulaczyk3, Jan A Piotrowski2, Nicolaj Krog K Larsen4, Matthew Siegfried5, Lucas Beem6 and Jenny Suckale7, (1)Scripps Institution of Oceanography, La Jolla, CA, United States, (2)Aarhus University, Aarhus, Denmark, (3)University of California Santa Cruz, Earth and Planetary Sciences, Santa Cruz, CA, United States, (4)Aarhus University, Aarhus C, Denmark, (5)University of California San Diego, La Jolla, CA, United States, (6)California Institute of Technology, Geological and Planetary Sciences, Pasadena, CA, United States, (7)Stanford University, Department of Civil and Environmental Engineering, Stanford, CA, United States
Signatures of ice-marginal landforms formed at marine-based grounding lines (153277)
Lauren Miller Miller, Rice University, Houston, TX, United States, Sarah L. Greenwood, Stockholm University, Department of Geological Sciences, Stockholm, Sweden and John B Anderson, Rice University, Department of Earth Science, Houston, TX, United States
The Patterned Topography of Ice Stream Beds; Insight from the Spatial Frequency of Mega-Scale Glacial Lineations (182857)
Matteo Spagnolo1, Timothy C Bartholomaus2, Chris Clark3, Chris Stokes4, Nigel Atkinson5, Julian A. Dowdeswell6, Jeremy Ely7, Alastair GC Graham8, Kelly Hogan9, Edward C King10, Stephen John Livingstone7 and Hamish D Pritchard10, (1)University of Aberdeen, Aberdeen, United Kingdom, (2)University of Texas at Austin, Austin, TX, United States, (3)Univ Sheffield, Sheffield, United Kingdom, (4)University of Durham, Durham, United Kingdom, (5)Alberta Geological Survey, Edmonton, AB, Canada, (6)Scott Polar Research Institute, University of Cambridge, Cambridge, United Kingdom, (7)University of Sheffield, Sheffield, United Kingdom, (8)Cardiff University, Cardiff, United Kingdom, (9)British Antarctic Survey, Cambridge, United Kingdom, (10)NERC British Antarctic Survey, Cambridge, United Kingdom
Extensive massive basal-ice structures in West Antarctica relate to ice-sheet anisotropy and ice-flow (151078)
Neil Ross, Newcastle University, Tyne and Wear, United Kingdom, Robert G. Bingham, University of Edinburgh, School of GeoSciences, Edinburgh, United Kingdom, Hugh F J Corr, NERC British Antarctic Survey, Cambridge, United Kingdom and Martin J Siegert, Imperial College London, London, United Kingdom

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