HR: 0800h
AN: C31B-0333    [Abstracts]
TI: Longitudinal Deviatoric Stresses in Streaming Flow: results from a simple model
AU: * Dupont, T K
EM: dupont@geosc.psu.edu
AF: The Pennsylvania State University, Department of Geosciences and EMS EESI, University Park, PA 16802 United States
AU: Alley, R B
EM: ralley@geosc.psu.edu
AF: The Pennsylvania State University, Department of Geosciences and EMS EESI, University Park, PA 16802 United States
AB: Longitudinal deviatoric stresses are assuming a new importance in the modeling of ice-stream flow and ice-sheet stability. Recent ice-shelf changes have been followed by inland-ice changes in several places, and strong tidal effects are observed propagating up ice streams. New model results and data show the importance of transmission of longitudinal deviatoric stresses across regions of enhanced basal lubrication and feedbacks on the maintenance of that lubrication. Here, we report additional model results on longitudinal-stress effects in ice-stream flow, showing further the importance of these phenomena. We suggest that longitudinal deviatoric stresses should not be neglected when assessing future sea-level rise under warming climate scenarios.
DE: 1863 Snow and ice (1827)
SC: Cryosphere [C]
MN: 2004 AGU Fall Meeting