Accession Number : ADA188147

Title :   Ice-Shelf Response to Ice-Stream Discharge Fluctuation: I. Unconfined Ice Tongues,

Corporate Author : CHICAGO UNIV IL DEPT OF GEOPHYSICAL SCIENCES

Personal Author(s) : MacAyeal, Douglas R ; Barcilon, Victor

PDF Url : ADA188147

Report Date : Jan 1987

Pagination or Media Count : 21

Abstract : Unsteady thickness and flow observed on the Ross Ice Shelf are thought to result primarily from fluctuations of ice streams and outlet glaciers that feed the ice shelf at its inland boundaries. Ice-stream discharge fluctuations constitute an independent means of forcing unsteady ice-shelf behavior, and their effect must be distinguished from those of oceanic and atmospheric climate to understand ice-shelf change. Ice-stream-generated fluctuations of a one-dimensional ice shelf are found to propagate through the ice shelf environment along the two characteristics of the hyperbolic governing equations. One characteristic permits instantaneous transmission of grounding-line velocity changes to all points downstream. The other characteristic represents slow transmission of grounding-line thickness changes along Lagrangian particle paths.

Descriptors :   *LAND ICE, *GLACIERS, BOUNDARIES, EQUATIONS, ICE, LAGRANGIAN FUNCTIONS, ONE DIMENSIONAL, PARTICLES, PATHS, ROSS SEA, STREAMS, TRANSMITTANCE, UNSTEADY FLOW, THICKNESS, MATHEMATICAL MODELS, VARIATIONS

Subject Categories : Snow, Ice and Permafrost

Distribution Statement : APPROVED FOR PUBLIC RELEASE