C42A:
Antarctic Ice Shelves: Surface and Basal Processes, Instability, and Breakup II

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Session ID#: 34004

Session Description:
In Antarctica, 44% of the coastline is fringed by ice shelves extending 1.5 million km2. Ice shelves buttress flow from grounded ice into the sea, and so are an important control on ice sheet mass balance. As recent shelf loss on the Antarctic Peninsula has resulted in outlet glacier speed-up and sea level rise, understanding the processes leading to ice shelf instability and break-up is of huge societal importance. Changes in atmosphere/ocean circulation and air/water temperature are implicated in recent collapse events through their effects on surface/basal melting respectively. The precise mechanisms involved remain elusive, but it is thought that fracture mechanics may play a role. Here we seek contributions from all geoscientists investigating processes occurring above, on, within and below ice shelves through fieldwork, remote-sensing and modelling. Our aim is to improve knowledge about past and current ice shelf dynamics and stability, and elucidate potential future ice shelf states.
Primary Convener:  Amber Leeson, University of Lancaster, Lancaster Environment Centre / Data Science institute, Lancaster, United Kingdom
Conveners:  Ian Willis, University of Cambridge, Scott Polar Research Institute, Cambridge, United Kingdom, Alison F Banwell, UK Centre for Polar Observation and Modelling, Northumbria University, School of Geography and Natural Sciences, Newcastle upon Tyne, United Kingdom and Daniel Goldberg, University of Edinburgh, School of GeoSciences, Edinburgh, EH9, United Kingdom
Chairs:  Amber Leeson, University of Lancaster, Lancaster Environment Centre / Data Science institute, Lancaster, United Kingdom and Ian Willis, University of Cambridge, Scott Polar Research Institute, Cambridge, United Kingdom
OSPA Liaison:  Daniel Goldberg, University of Edinburgh, Edinburgh, EH9, United Kingdom
Index Terms:

0728 Ice shelves [CRYOSPHERE]
0746 Lakes [CRYOSPHERE]
0762 Mass balance 0764 Energy balance [CRYOSPHERE]
0774 Dynamics [CRYOSPHERE]

Abstracts Submitted to this Session:

Continent-Wide Estimates of Antarctic Strain Rates from Landsat 8-Derived Velocity Grids and Their Application to Ice Shelf Studies (Invited) (218177)
Karen E Alley1, Ted Scambos2, Robert S Anderson3, Harihar Rajaram4, Allen Pope5 and Terry Haran5, (1)University of Colorado at Boulder, Boulder, CO, United States, (2)National Snow and Ice Data Center, University of Colorado, Boulder, CO, United States, (3)Department of Geological Sciences and INSTAAR, Boulder, United States, (4)Johns Hopkins University, Baltimore, MD, United States, (5)National Snow and Ice Data Center, Boulder, CO, United States
Channelized melting drives thinning under Dotson ice shelf, Western Antarctic Ice Sheet (240737)
Noel Gourmelen1, Daniel Goldberg1, Kate Snow2, Sian F Henley2, Robert G. Bingham2, Satoshi Kimura3, Anna Hogg4, Andrew Shepherd5, Jeremie Mouginot6, Jan Lenaerts7, Stefan Ligtenberg8 and Willem Jan Van De Berg8, (1)University of Edinburgh, School of GeoSciences, Edinburgh, EH9, United Kingdom, (2)University of Edinburgh, School of GeoSciences, Edinburgh, United Kingdom, (3)British Antarctic Survey, Cambridge, United Kingdom, (4)CPOM, University of Leeds, Leeds, United Kingdom, (5)University of Leeds, Centre for Polar Observation and Modelling, School of Earth and Environment, Leeds, LS2, United Kingdom, (6)University of California Irvine, Department of Earth System Science, Irvine, CA, United States, (7)University of Colorado Boulder, Department of Atmospheric and Oceanic Sciences, Boulder, CO, United States, (8)University Utrecht / IMAU, Utrecht, Netherlands
Early precursors to break-up of the Larsen Ice Shelves, Antarctica (294369)
Ted A Scambos and Marin Klinger, National Snow and Ice Data Center, Boulder, CO, United States
Ice shelf melt rates in Greenland and Antarctica using time-tagged digital imagery from World View and TanDEM-X (299507)
Arnaud Charolais1, Eric J Rignot2, Pietro Milillo3, Bernd Scheuchl4 and Jeremie Mouginot4, (1)University of California Irvine, Earth System Science, Irvine, CA, United States, (2)Jet Propulsion Laboratory, Pasadena, United States, (3)California Institute of Technology, Pasadena, CA, United States, (4)University of California Irvine, Department of Earth System Science, Irvine, CA, United States
Effects of ice shelf basal melt variability on evolution of Thwaites Glacier (289639)
Matthew J Hoffman1, Jeremy Garmeson Fyke2, Stephen F Price3, Xylar Asay-Davis1 and Mauro Perego4, (1)Los Alamos National Laboratory, Fluid Dynamics and Solid Mechanics, Los Alamos, NM, United States, (2)Los Alamos National Laboratory, Los Alamos, NM, United States, (3)Los Alamos National Laboratory, Fluid Dynamics and Solid Mechanics, Los Alamos, United States, (4)Sandia National Laboratories, Albuquerque, United States
Bending the law: tidal bending and its effects on ice viscosity and flow (283035)
Sebastian Rosier, NERC British Antarctic Survey, Cambridge, United Kingdom and Gudmundur Hilmar Gudmundsson, Northumbria University, Geography and Environmental Sciences, Newcastle-Upon-Tyne, United Kingdom

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