C014
Geological Signatures of Ice Shelves Past and Present
Session ID#: 78198
Session Description:
Floating ice shelves restrain the upstream flow of continental ice and, thus, changes within them can lead to glacier acceleration with direct impacts on global sea level. However, the signatures of ice shelves, including possible past collapses, are complex. As a consequence, their role in influencing past ice-sheet dynamics is often poorly resolved. Similarly, present-day geological environments and ice-ocean processes near to ice shelves remain difficult to characterise especially in inaccessible sub-ice shelf settings. We welcome submissions exploiting observational, modelling, or theoretical methods to study the signatures, processes, and dynamics of ice shelves past and present. Topics may include: sedimentary and/or geomorphic proxies for ice-shelf geometries and configurations; ice-ocean and geological processes operating at and under ice shelves; reconstructions of ice-shelf changes; studies of sub-ice shelf bathymetry; and studies exploring the rates and processes of ice-shelf collapse including links to and debates surrounding the role of marine ice-cliff instability.
Index Terms:
0728 Ice shelves [CRYOSPHERE]
0774 Dynamics [CRYOSPHERE]
3022 Marine sediments: processes and transport [MARINE GEOLOGY AND GEOPHYSICS]
3045 Seafloor morphology, geology, and geophysics [MARINE GEOLOGY AND GEOPHYSICS]
Primary Convener: Alastair GC Graham, University of South Florida St. Petersburg, College of Marine Science, St Petersburg, United States
Conveners: James Smith, British Antarctic Survey, Cambridge, United Kingdom, Anna Ruth W Halberstadt, University of Massachusetts Amherst, Amherst, MA, United States and Brad E Rosenheim, University of South Florida St. Petersburg, College of Marine Science, St Petersburg, FL, United States
Primary Liaison: Alastair GC Graham, University of South Florida St. Petersburg, College of Marine Science, St Petersburg, United States
Unmixing mixtures of carbon for accurate ages of ice-proximal glaciomarine continental margin sediments (565721)
Brad E Rosenheim, University of South Florida St. Petersburg, St Petersburg, FL, United States, Kenta Suzuki, Hokkaido University, Sapporo, Japan, Theresa M King, University of South Florida, College of Marine Science, Tampa, FL, United States, Leonid Polyak, Byrd Polar and Climate Research Center, Ohio State University, Columbus, OH, United States, Masanobu Yamamoto, Hokkaido Univ, Sapporo, Japan, Amelia Shevenell, University of South Florida, Tampa, FL, United States and Anitra E. Ingalls, University of Washington, Seattle, WA, United States
“Then new problems came, from above and below…”: Heinrich Events and the future of West Antarctic ice (Invited) (587813)
Richard B Alley1, Karen E Alley2,3, Byron R Parizek4,5, Emily Schwans4 and Sridhar Anandakrishnan4, (1)Pennsylvania State University, Geosciences, University Park, PA, United States, (2)CIRES University of Colorado, National Snow and Ice Data Center, Boulder, CO, United States, (3)College of Wooster, Wooster, OH, United States, (4)Pennsylvania State University, University Park, PA, United States, (5)Pennsylvania State University DuBois, DuBois, PA, United States
Basement structure of the Ross Sea from gravity inversion (597901)
Renata Constantino, Lamont -Doherty Earth Observatory, Marine Geology and Geophysics, Palisades, NY, United States, Kirsty J Tinto, Columbia University, Palisades, NY, United States, Robin Elizabeth Bell, Lamont -Doherty Earth Observatory, Palisades, NY, United States and IODP Expedition 374 Scientists, Integrated Ocean Drilling Program, College Station, TX, United States
Bathymetry of Northeast Greenland from Oceans Melting Greenland (OMG) High-Resolution Airborne Gravity and Magnetometer Data (605418)
Caitlin Dieck Locke, Lamont-Doherty Earth Observatory, Columbia University, Palisades, NY, United States, Kirsty J Tinto, Columbia University, Palisades, NY, United States and Josh K Willis, Jet Propulsion Laboratory, Pasadena, CA, United States
Seafloor Depth of George VI Sound, Antarctic Peninsula, From Inversion of Operation IceBridge Aerogravity (607108)
Robin Elizabeth Bell1, Renata Constantino2, Kirsty J Tinto3, David Felton Porter4, Journey Berry5, Katrina Zamudio6, Caitlin Dieck Locke7, Jonny Norwine8 and Sarah Packard8, (1)Lamont -Doherty Earth Observatory, Palisades, NY, United States, (2)Lamont -Doherty Earth Observatory, Marine Geology and Geophysics, Palisades, NY, United States, (3)Columbia University, Palisades, NY, United States, (4)Lamont-Doherty Earth Observatory, Palisades, NY, United States, (5)Lamont-Doherty Earth Observatory, Palisades, United States, (6)USGS Crustal Geophysics and Geochemistry Science Center Denver, Denver, United States, (7)Lamont-Doherty Earth Observatory, Columbia University, Palisades, NY, United States, (8)Colorado College, Colorado Springs, United States
Insights into Past Changes in Thwaites Glacier from High-Resolution Sea-Floor Geophysical Data Obtained Using an Autonomous Underwater Vehicle (621469)
Alastair GC Graham, University of South Florida St. Petersburg, College of Marine Science, St Petersburg, United States, Anna Wahlin, University of Gothenburg, Gothenburg, Sweden, Robert D Larter, British Antarctic Survey, Cambridge, United Kingdom, Kelly Hogan, NERC British Antarctic Survey, Cambridge, United Kingdom, Frank Oliver Nitsche, Lamont-Doherty Earth Observatory of Columbia University, Palisades, NY, United States, Karen J. Heywood, University of East Anglia, Norwich, NR4, United Kingdom, Rebecca Totten Minzoni, University of Alabama, Tuscaloosa, AL, United States, Julia S Wellner, University of Houston, Houston, TX, United States and NBP19-02 scientific party
