Document Type

Article

Publication Title

Journal of Geophysical Research

Publication Date

1981

First Page

3960

Last Page

3968

Volume Number

86

Abstract/ Summary

Jakobshavns Glacier, a floating outlet glacier on the West Greenland coast, was surveyed during July 1976. The vertical displacements of targets along two profiles perpendicular to the fjord wall bounding the north margin of the glacier were analyzed to determine the effect of flexure caused by tidal oscillations within the fjord. An analysis based on the assumption that vertical displacements of the glacier reflected pure elastic bending yielded the conclusion that the effective thickness of the ice (i.e., the thickness which remained unaffected by surface and basal cracking and which behaved as a continuum) was ∼160 m 2.6 km upglacier from the calving front and ∼110 m 0.6 km from the calving front. An analysis based on the more realistic assumption that observed bending reflected elastic and viscoplastic deformation yielded the conclusion that the average effective thickness of the ice was 316 ± 74 m (∼40% of the estimated 800-m total thickness) 2.6 km from the calving front and 160 ± 48 m (∼21% of the estimated 750-m total) 0.6 km from the calving front. A constitutive relationship appropriate for hard glide during flexure was used.

Citation/Publisher Attribution

Lingle, CS, Hughes, TJ, and Kollmeyer, RC, 1981, Tidal Flexure of Jakobshavns Glacier, West Greenland: Journal of Geophysical Research, v. 86, p. 3960-3968. To view the published open abstract, go to http://dx.doi.org and enter the DOI.

Publisher Statement

© Copyright 1981 American Geophysical Union

DOI

10.1029/JB086iB05p03960

Version

publisher's version of the published document

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