Basal dynamics of Kronebreen, a fast-flowing tidewater glacier in Svalbard:non-local spatio-temporal response to water input

We evaluate the variability in basal friction for Kronebreen, Svalbard, a fast-flowing tidewater glacier. We invert 3 years (2013–15) of surface velocities at high temporal resolution (generally 11 days), to estimate the changing basal properties of the glacier. Our results suggest that sliding beha...

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Bibliographic Details
Published in:Journal of Glaciology
Main Authors: Vallot, Dorothée, Pettersson, Rickard, Luckman, Adrian, Benn, Douglas I., Zwinger, Thomas, van Pelt, Ward J. J., Kohler, Jack, Schäfer, Martina, Claremar, Björn, Hulton, Nicholas R. J.
Format: Article in Journal/Newspaper
Language:English
Published: 2017
Subjects:
Arctic glaciology
Glacier modelling
Ice dynamics
Ice velocity
Subglacial processes
Arctic
Kronebreen
Svalbard
glacier
Journal of Glaciology
Tidewater
Online Access:https://risweb.st-andrews.ac.uk/portal/en/researchoutput/basal-dynamics-of-kronebreen-a-fastflowing-tidewater-glacier-in-svalbard(722ad197-3b37-4d8b-be06-59de89e713a1).html
https://doi.org/10.1017/jog.2017.69
https://research-repository.st-andrews.ac.uk/bitstream/10023/12282/1/Benn_2017_JG_Kronebreen_CC.pdf
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Summary:We evaluate the variability in basal friction for Kronebreen, Svalbard, a fast-flowing tidewater glacier. We invert 3 years (2013–15) of surface velocities at high temporal resolution (generally 11 days), to estimate the changing basal properties of the glacier. Our results suggest that sliding behaviour of Kronebreen within a year is primarily influenced by changes in water input patterns during the meltwater season and basal friction is highly variable from a year to another. At present, models usually employ parameterisations to encompass the complex physics of glacier sliding by mathematically simulate their net effect. For such ice masses with strong seasonal variations of surface melt, the spatio-temporal patterns of basal friction imply that it is neither possible nor appropriate to use a parameterisation for bed friction that is fixed in space and/or time, at least in a timescale of a few years. Basal sliding may not only be governed by local processes such as basal topography or summer melt, but also be mediated by factors that vary over a larger distance and over a longer time period such as subglacial hydrology organisation, ice-thickness changes or calving front geometry.

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