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A method to reconstruct past accumulation rates in alpine firn regions: A study on Fiescherhorn, Swiss Alps
journal contribution
posted on 2023-05-16, 18:45 authored by Schwerzmann, A, Funk, M, Blatter, H, Luethi, M, Schwikowski, M, Palmer, ASAnnual snow layers in the accumulation zone of glaciers become thinner by viscous deformation while moving to greater depth. The reconstruction of the accumulation rate history requires the correction of the thickness of annual layers. We apply a novel method to determine the vertical velocity by repeated survey with a caliper probe of grooves scratched into the wall of a borehole. With this information and the assumptions of steady state velocity and density fields, the correction of layer thicknesses can be determined without knowledge of the ice density profile and thus can be applied to boreholes without ice cores. The method is applied to a borehole on Fiescherhorn, Swiss Alps, resulting in a substantially larger correction than with the simpler method of Nye (1963). Copyright 2006 by the American Geophysical Union.
History
Publication title
Journal of Geophysical Research - Earth SurfaceVolume
111Issue
F1Pagination
F01014ISSN
0148-0227Department/School
School of Natural SciencesPublisher
American Geophysical UnionPlace of publication
WashingtonRepository Status
- Restricted