C11A:
Advances in Our Understanding of Processes at the Beds of Glaciers and Ice Sheets I Posters


Session ID#: 8185

Session Description:
The dynamic behavior of land-based and marine terminating glaciers often rests 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 for both past and future climate.

This session includes contributions that aim to understand 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 basal environment, among others. We invite a range of approaches that capture all spatiotemporal scales of these processes, including field and geophysical observations, laboratory experiments, sedimentological and morphometric studies, and modeling efforts. We especially welcome novel, multifaceted studies that more comprehensively characterize this complex interface.
Primary Convener:  Lucas Zoet, University of Wisconsin-Madison, Department of Geoscience, Madison, WI, United States
Conveners:  Matthew Siegfried, University of California San Diego, La Jolla, CA, United States, Neal R Iverson, Iowa State univ, Ames, IA, United States and Knut A Christianson, University of Washington, Earth and Space Sciences, Seattle, WA, United States
Chairs:  Lucas Zoet, University of Wisconsin-Madison, Department of Geoscience, Madison, WI, United States and Matthew Siegfried, Stanford University, Geophysics, Stanford, CA, United States
OSPA Liaison:  Knut A Christianson, University of Washington, Seattle, WA, United States

Cross-Listed:
  • EP - Earth and Planetary Surface Processes
Index Terms:

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

Abstracts Submitted to this Session:

A statistical model for basal sliding (65527)
Evan M Cummings, University of Montana, Missoula, MT, United States and Jesse V Johnson, University of Montana, Missoula, United States
Tidally Influenced Stick-Slip in 1D Models of Ice Stream Flow with Rate-and-State Friction (66530)
Rob M Skarbek, Lamont-Doherty Earth Observatory, Columbia University, Palisades, NY, United States and Alan W Rempel, University of Oregon, Eugene, OR, United States
Micro-seismicity of the Whillans Ice Plain stick-slip cycle nucleation areas (71297)
Grace Barcheck, Cornell University, Earth and Atmospheric Sciences, Ithaca, NY, United States, Susan Y Schwartz, University of California-Santa Cruz, Santa Cruz, CA, United States and Slawek M Tulaczyk, University of California Santa Cruz, Earth and Planetary Sciences, Santa Cruz, CA, United States
Icequakes and ambient noise sources detected by a geophone array at the Kaskawulsh glacier (71044)
Naofumi Aso, California Institute of Technology, Pasadena, CA, United States, Victor C Tsai, California Institute of Technology, Seismological Laboratory, Pasadena, CA, United States, Christian Schoof, University of British Columbia, Department of Earth, Ocean and Atmospheric Sciences, Vancouver, BC, Canada, Arran Whiteford, University of British Columbia, Vancouver, BC, Canada and Gwenn E Flowers, Simon Fraser University, Department of Earth Sciences, Burnaby, BC, Canada
Preliminary results from hot-water drilling and borehole instrumentation on Store Glacier, West Greenland (80861)
Poul Christoffersen1, Samuel Huckerby Doyle2, Bryn P Hubbard3, Tun Jan Young4, Coen M Hofstede5, Jason Box6, Joe Todd7, Marion H Bougamont1 and Alun Hubbard8,9, (1)University of Cambridge, Scott Polar Research Institute, Cambridge, United Kingdom, (2)Aberystwyth University, Aberystwyth, SY23, United Kingdom, (3)Aberystwyth University, Department of Geography and Earth Sciences, Aberystwyth, United Kingdom, (4)Scott Polar Research Institute, Cambridge, United Kingdom, (5)Alfred Wegener Institute, Helmholtz-Center for Polar and Marine Research (AWI), Division of Geosciences, Bremerhaven, Germany, (6)Geological Survey of Denmark and Greenland, Copenhagen, Denmark, (7)University of St Andrews, St Andrews, United Kingdom, (8)Aberystwyth University, Aberystwyth, United Kingdom, (9)University of Tromsø, Department of Geology, Tromsø, Norway
Ross Sea Till Properties: Implications for Ice Sheet Bed Interaction (85158)
Anna Ruth Halberstadt1, John B Anderson2, Lauren Miller Miller1, Lindsay O Prothro3 and Philip J Bart4, (1)Rice University, Houston, TX, United States, (2)Rice University, Department of Earth, Environmental and Planetary Sciences, Houston, United States, (3)Rice University, Department of Earth Science, Houston, TX, United States, (4)Louisiana State University, Baton Rouge, LA, United States
Measuring melt and velocity of Alaskan mountain glaciers using phase-sensitive radar and differential GPS (85365)
Sarah Neuhaus, University of California Santa Cruz, Santa Cruz, CA, United States and Slawek M Tulaczyk, University of California Santa Cruz, Earth and Planetary Sciences, Santa Cruz, CA, United States
A novel approach to improving the reconstruction of bed elevation with special consideration of bathymetry at the ice/ocean interface of the Greenland ice sheet (69688)
Chris Williams1, Jonathan L Bamber1, James R. Cochran2, Stephen L. Cornford3, Julian A. Dowdeswell4, Ruud TWL Hurkmans1, Tom M. Jordan1, Mathieu Morlighem5, Steven John Palmer6, Martin J Siegert7, Kirsty J Tinto8 and John Drysdale Paden9, (1)University of Bristol, School of Geographical Sciences, Bristol, United Kingdom, (2)Lamont -Doherty Earth Observatory, Palisades, NY, United States, (3)University of Swansea, Centre for Polar Observation and Modelling, Department of Geography, Swansea, United Kingdom, (4)Scott Polar Research Institute, University of Cambridge, Cambridge, United Kingdom, (5)University of California Irvine, Irvine, CA, United States, (6)University of Exeter, Exeter, United Kingdom, (7)Imperial College London, London, United Kingdom, (8)Columbia University, Lamont-Doherty Earth Observatory, Palisades, United States, (9)Center for Remote Sensing of Ice Sheets (CReSIS), University of Kansas, Lawrence, United States
Using NASA Warm Ice Sounding Explorer (WISE) Data to Reexamine the Bed Morphology of Malaspina Glacier, Alaska (73467)
Bruce Franklin Molnia, U.S. Geological Survey, National Civil Applications Center, Reston, United States, Laura E Snyder-Deaton, US Geological Survey, Eastern Geographic Science Center, Reston, VA, United States and Kim Angeli, US Geological Survey, National Civil Applications Center, Reston, VA, United States
Subglacial and Proglacial Deformation of the Late Wisconsinan Puget Lobe (59899)
Jasper Knight, University of Witwatersrand, Johannesburg, South Africa
Testing Models of Modern Glacial Erosion of the St. Elias Mountains, Alaska Using Marine Sediment Provenance (73051)
Michelle L Penkrot1, John M Jaeger2, Dylan P Loss1 and Emilie Bruand3, (1)University of Florida, Gainesville, FL, United States, (2)University of Florida, Geological Sciences, Ft Walton Beach, FL, United States, (3)Portsmouth University, School of Earth and Environmental Sciences, Portsmouth, United Kingdom
Inferring glacial history and subglacial process through analysis of cosmogenic nuclides in icebound cobbles (73262)
Lee B Corbett1, Paul R Bierman1, Thomas Neumann2 and Joseph A Graly3, (1)University of Vermont, Rubenstein School of Environment and Natural Resources, Burlington, United States, (2)NASA Goddard Space Flight Ctr, Greenbelt, MD, United States, (3)University of Wyoming, Laramie, WY, United States
Proglacial hydrochemistry and sediment characteristics observed across a spectrum of glacier dynamic regimes (83868)
Jeff W Crompton, Simon Fraser University, Burnaby, BC, Canada and Gwenn E Flowers, Simon Fraser University, Department of Earth Sciences, Burnaby, BC, Canada
Tracing Shifts in Subglacial Hydrochemistry Due to Changes in Drainage Configuration: Athabasca Glacier, Alberta, Canada (86214)
Mark Robbins1, Carli A Arendt2, Anna E Clinger3, Emily Isabel Stevenson3 and Sarah Aciego2, (1)University of Michigan Ann Arbor, Earth and Environmental Sciences, Ann Arbor, MI, United States, (2)University of Michigan Ann Arbor, Ann Arbor, MI, United States, (3)University of Michigan, Ann Arbor, MI, United States
Seasonal Variation and Controls on Subglacial Riverine CO2 Concentrations From a Small Catchment, West Greenland Ice Sheet (68529)
Grace Andrews, University of Southampton, Southampton, United Kingdom and Andrew D Jacobson, Northwestern University, Department of Earth and Planetary Sciences, Evanston, United States
Spatial distribution and diversity of hummocky tracts in Southern Sweden - an analog to subglacial drainage in present large ice sheets? (77759)
Gustaf Peterson, Geological Survey of Sweden, Uppsala, Sweden; University of Gothenburg, Departement of Earth Sciences, Gothenburg, Sweden and Mark D Johnson, University of Gothenburg, Gothenburg, Sweden
Sedimentary Processes of Unstable Ice Sheet Grounding Zones: Comparing Polar and Temperate Grounding Zone Wedges Using Marine Geophysical Data and Outcrop Studies (84769)
Brian Patrick Demet1, John B Anderson2, Jeffrey A Nittrouer3, Lauren Miller Miller1, Anna Ruth Halberstadt1 and Lindsay O Prothro1, (1)Rice University, Houston, TX, United States, (2)Rice University, Department of Earth, Environmental and Planetary Sciences, Houston, United States, (3)Texas Tech University, Department of Geosciences, Lubbock, TX, United States
The grounding-zone wedge inventory on the Amundsen Sea Embayment shelf, West Antarctica: formation processes and significance for establishing reliable post-LGM retreat chronologies (69249)
Johann P P Klages1, Gerhard Kuhn2, Claus-Dieter Hillenbrand3, James Smith3, Alastair GC Graham4, Karsten Gohl5 and Lukas Wacker6, (1)Alfred Wegener Institute Helmholtz-Center for Polar and Marine Research Bremerhaven, Marine Geosciences, Bremerhaven, Germany, (2)Alfred Wegener Institute Helmholtz-Center for Polar and Marine Research (AWI), Bremerhaven, Germany, (3)British Antarctic Survey, Cambridge, United Kingdom, (4)University of South Florida St. Petersburg, St Petersburg, FL, United States, (5)Alfred Wegener Institute Helmholtz-Center for Polar and Marine Research Bremerhaven, Geosciences, Bremerhaven, Germany, (6)ETH Zurich, Dept. of Ion Beam Physics, Zurich, Switzerland
Implications Of Fault Damaged Bedrock To Tectonic and Landscape Evolution In Coastal Alaska (84174)
Annie Boucher1, Peter Ortquist Koons2, Samuel G. Roy1, Sean D Birkel3, Lynn M Kaluzienski2 and Seth W Campbell2, (1)University of Maine, Orono, ME, United States, (2)University of Maine, School of Earth and Climate Sciences, Orono, ME, United States, (3)University of Maine, School of Earth and Climate Sciences, Orono, United States

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