HR: 0800h
AN: C51A-0268    [Abstracts]
TI: Ice-flow sensitivity to variable resistive stresses
AU: Parizek, B R
EM: parizek@geosc.psu.edu
AF: Department of Geosciences and PSICE Center Pennsylvania State University, 532 Deike Building, University Park, PA 16802 United States
AU: Alley, R B
EM: ralley@essc.psu.edu
AF: Department of Geosciences and PSICE Center Pennsylvania State University, 532 Deike Building, University Park, PA 16802 United States
AU: Dupont, T K
EM: dupont@geosc.psu.edu
AF: Department of Geosciences and PSICE Center Pennsylvania State University, 532 Deike Building, University Park, PA 16802 United States
AU: * Vacco, D A
EM: dvacco@geosc.psu.edu
AF: Department of Geosciences and PSICE Center Pennsylvania State University, 532 Deike Building, University Park, PA 16802 United States
AB: Longitudinal stresses, side shear, and oceanic backpressure have been combined with pre-existing vertical shear in the momentum balance within the PSU/UofC flowline model. This enables us to investigate the regional response of grounded-ice flow to variable resistance from the bed, lateral boundaries, and/or ice shelf, leading to an improved understanding of the thermodynamic impact of local and regional resistance to inland flow. Our modeling efforts are directed towards the poorly-constrained interplay between basal lubrication, ice-shelf buttressing, and embayment geometry, and their evolving effects on the ice streams, outlet glaciers, and inland ice of Greenland and Antarctica. In teasing out the relative importance of these processes at different spatial and temporal scales, we hope to correlate observed changes with a given process(es). These findings can then be extended to basin-wide simulations and used to improve projections for the future dynamics of the Greenland and Antarctic ice sheets under a variety of global-warming scenarios.
DE: 1635 Oceans (1616, 3305, 4215, 4513)
DE: 1827 Glaciology (0736, 0776, 1863)
DE: 1863 Snow and ice (0736, 0738, 0776, 1827)
SC: Cryosphere [C]
MN: Fall Meeting 2005