PP11E:
How Fast? How Far? How Much? Paleoconstraints on the Extent and Rates of Retreat in Marine-Terminating Glaciers, Ice Sheets, and Sea Ice I

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Session ID#: 17422

Session Description:
How fast will glaciers and ice sheets retreat and sea levels rise in response to future warming? Will changes be irreversible? Current projections for long-term change vary widely depending on the treatment of feedbacks. Resolving differences in long-term rates, and understanding how short-term natural variability or anthropogenic change may trigger rapid ice loss, is essential for policy development. Recent history is of limited help; observed variability is small compared to the expected future changes. This session explores how paleo-studies constrain understanding of variability, sensitivity, triggers, rates and processes of large-scale ice loss. We will focus on marine-terminating ice systems, their connections to inland ice, sea ice, and modeling of past variability documented in paleo-archives from ice, land, and ocean. We are particularly interested in well-documented examples from marine terminating ice systems in Greenland and Antarctica, although case studies from other regions and examination of relevant modern processes are also welcome.
Primary Convener:  Alan C Mix, Oregon State University, Corvallis, OR, United States
Conveners:  Martin Jakobsson, Stockholm University, Department of Geological Sciences, Stockholm, Sweden, Camilla S Andresen, Geological Survey of Denmark and Greenland, København K, Denmark and Eystein Jansen, University of Bergen, Bergen, Norway
Chairs:  Alan C Mix, Oregon State University, Corvallis, OR, United States and Martin Jakobsson, Stockholm University, Department of Geological Sciences, Stockholm, Sweden
OSPA Liaison:  Eystein Jansen, University of Bergen, Bergen, Norway

Cross-Listed:
  • C - Cryosphere
  • OS - Ocean Sciences
Index Terms:

0728 Ice shelves [CRYOSPHERE]
1105 Quaternary geochronology [GEOCHRONOLOGY]
4207 Arctic and Antarctic oceanography [OCEANOGRAPHY: GENERAL]
4901 Abrupt/rapid climate change [PALEOCEANOGRAPHY]

Abstracts Submitted to this Session:

How Fast? How Far? How Much? What We Need to Learn from the Past Behavior of Ice Sheets, and What They Might Not Tell Us (Invited) (127823)
Richard B Alley, Pennsylvania State University, Department of Geosciences, University Park, United States
Millennial-scale variations of an East Antarctic outlet glacier during the Last Glaciation (180844)
Dr. Amelia Shevenell, Ph.D.1, Michelle Guitard1, Brad E Rosenheim2, Amy Leventer3 and Yusuke Yokoyama4, (1)University of South Florida, Tampa, United States, (2)University of South Florida, College of Marine Science, Saint Petersburg, United States, (3)Colgate University, Hamilton, United States, (4)The University of Tokyo, Atmosphere and Ocean Research Institute (AORI), Kashiwa, Japan
West Antarctic Ice Sheet Retreat in the Eastern Ross Sea Concomitant with Meltwater Pulse-1a and -1b Using New Foraminiferal Radiocarbon Ages. (141278)
Matthew DeCesare, Louisiana State University, Geology and Geophysics, Baton Rouge, LA, United States, Philip J Bart, Louisiana State University, Department of Geology and Geophysics, Baton Rouge, United States, Wojciech Majewski, Institute of Paleobiology, Polish Academy of Sciences, Warszawa, Poland and Brad E Rosenheim, University of South Florida, College of Marine Science, Saint Petersburg, United States
Widespread collapse of the Ross Ice Shelf during the late Holocene reconstracted from compound specific C-14 and meteoric Be-10 (Invited) (129515)
Yusuke Yokoyama1,2, John B Anderson3, Masako Yamane4, Lauren Miller Miller5, Yosuke Miyairi1, Takahiro Yamazaki1, Mamito Koizumi1, Kazuya Kusahara6, Hisami Suga7, Lindsay O Prothro5, Hiroyasu Hasumi1, John Richard Southon8 and Naohiko Ohkouchi7, (1)The University of Tokyo, Atmosphere and Ocean Research Institute, Kashiwa, Chiba, Japan, (2)JAMSTEC Japan Agency for Marine-Earth Science and Technology, Kanagawa, Japan, (3)Rice University, Department of Earth Science, Houston, TX, United States, (4)University of Tokyo, Bunkyo-ku, Japan, (5)Rice University, Houston, TX, United States, (6)Institute of Low Temperature Science, Sapporo, Hokkaido, Japan, (7)JAMSTEC, Yokosuka, Japan, (8)University of California Irvine, Earth System Science, Irvine, United States
Arctic Ocean Cyclostratigraphy: An Alternative to Marine Oxygen Isotope curves as measures of Cryospheric and Sea-Level History (122022)
Thomas M Cronin, U.S. Geological Survey, Florence Bascom Geoscience Center, Reston, United States, Rachel E E Marzen, Rice University, Houston, TX, United States, Matt O'Regan, Stockholm University, Department of Geological Sciences, Stockholm, Sweden and Gary S. Dwyer, Division of Earth and Ocean Sciences, Nicholas School of the Environment, Duke University, Durham, NC, United States
Rapid thinning of the Laurentide Ice Sheet in coastal Maine, USA during late Heinrich Stadial 1 (177397)
Alexandria Jo Koester, Boston College, Chestnut Hill, MA, United States, Jeremy D Shakun, Boston College, Department of Earth and Environmental Sciences, Chestnut Hill, MA, United States, Paul R Bierman, University of Vermont, Rubenstein School of Environment and Natural Resources, Burlington, VT, United States, P Thompson Davis, Bentley University, Natural & Applied Sciences, Waltham, MA, United States, Lee B Corbett, University of Vermont, Rubenstein School of Environment and Natural Resources, Burlington, United States and Susan R H Zimmerman, Lawrence Livermore National Laboratory, Center for Accelerator Mass Spectrometry, Livermore, United States
Early deglaciation of the western sector of the Cordilleran Ice Sheet from cosmogenic nuclide exposure dating, central British Columbia coast (143002)
Christopher Darvill, University of Northern British Columbia, Prince George, BC, Canada, Brian Menounos, Geological Survey of Canada Pacific, Sidney, BC, Canada, Brent M Goehring, Tulane University of Louisiana, Department of Earth and Environmental Sciences, New Orleans, LA, United States and Olav B Lian, University of the Fraser Valley, Department of Geography and the Environment, Abbotsford, Canada
It takes two: New constraints on Cordilleran Ice Sheet extent and retreat from 10Be and radiocarbon dating (120703)
Alia J Lesnek, CUNY Queens College, Flushing, NY, United States and Jason P Briner, University at Buffalo, Department of Earth Sciences, Buffalo, United States

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