HR: 0800h
AN: C51A-0105    [Abstracts]
TI: Greenland: Beyond "ice-sheet" dynamics
AU: * Parizek, B R
EM: parizek@geosc.psu.edu
AF: The Pennsylvania State University, DuBois Campus 181 Smeal Building College Place, DuBois, PA 15801, United States
AU: Alley, R B
EM: ralley@geosc.psu.edu
AF: The Pennsylvania State University, 517 Deike Building, University Park, PA 16802, United States
AU: Dupont, T K
EM: tdupont@uci.edu
AF: University of California, Irvine, Department of Earth System Science 3226 Croul Hall, Irvine, CA 92697, United States
AU: du Bois, I J
EM: dubois4@tcnj.edu
AF: The College of New Jersey, Department of Physics P.O. Box 7718, Ewing, NJ 08628-0718, United States
AB: Subglacial dynamics likely play a critical roll in coupling shelf, outlet-glacier, and inland-ice flow regimes. Furthermore, strong indirect evidence indicates that surface meltwater can penetrate through roughly 1 km of ice in Greenland and lubricate basal motion (Zwally et al., 2002), thereby linking surface and basal processes. Historically, whole ice-sheet models simulate regions of "streaming" flow based on basal temperatures and an a priori knowledge of subglacial sediment distribution. In order to capture observed changes in ice flow, both temporal and spatial evolution of controlling basal properties are required. Coupling surface melt and basal processes to a flowline model that incorporates longitudinal and vertical-shear stresses, we assess the role of variable lubrication and the potential feedbacks between lubrication and moulin initiation on the dynamics of the Greenland ice sheet.
DE: 0700 CRYOSPHERE (4540)
DE: 0726 Ice sheets
DE: 0774 Dynamics
DE: 0798 Modeling
DE: 1621 Cryospheric change (0776)
SC: Cryosphere [C]
MN: 2007 Fall Meeting