Dynamic jamming of iceberg-choked fjords
Dynamic jamming of iceberg-choked fjords
We investigate the dynamics of ice mélange by analyzing rapid motion recorded by a time-lapse camera and terrestrial radar during several calving events that occurred at Jakobshavn Isbræ, Greenland. During calving events (1) the kinetic energy of the ice mélange is 2 orders of magnitude smaller than the total energy released during the events, (2) a jamming front propagates through the ice mélange at a rate that is an order of magnitude faster than the motion of individual icebergs, (3) the ice mélange undergoes initial compaction followed by slow relaxation and extension, and (4) motion of the ice mélange gradually decays before coming to an abrupt halt. These observations indicate that the ice mélange experiences widespread jamming during calving events and is always close to being in a jammed state during periods of terminus quiescence. We therefore suspect that local jamming influences longer timescale ice mélange dynamics and stress transmission.
glaciers, calving, icebergs, jamming
1122-1129
Peters, Ivo
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Amundson, Jason M.
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Cassotto, Ryan
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Fahnestock, Mark
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Darnell, Kristopher N.
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Truffer, Martin
abba4ef0-27de-467e-a68d-188e1d7bd57f
Zhang, Wendy W.
85d8f2da-b0a6-4e5e-90ac-38a0dda7c352
28 February 2015
Peters, Ivo
222d846e-e620-4017-84cb-099b14ff2d75
Amundson, Jason M.
0fe3854e-a2af-40a1-8684-0d70c8da35bc
Cassotto, Ryan
583eadad-31bc-4fe5-8d6a-a49c7c18894f
Fahnestock, Mark
3355ebed-96b4-4726-ba04-89b4fcc78b6f
Darnell, Kristopher N.
bad79781-0399-4dc9-ae24-001f5b9cf223
Truffer, Martin
abba4ef0-27de-467e-a68d-188e1d7bd57f
Zhang, Wendy W.
85d8f2da-b0a6-4e5e-90ac-38a0dda7c352
Peters, Ivo, Amundson, Jason M., Cassotto, Ryan, Fahnestock, Mark, Darnell, Kristopher N., Truffer, Martin and Zhang, Wendy W.
(2015)
Dynamic jamming of iceberg-choked fjords.
Geophysical Research Letters, 42 (4), .
(doi:10.1002/2014GL062715).
Abstract
We investigate the dynamics of ice mélange by analyzing rapid motion recorded by a time-lapse camera and terrestrial radar during several calving events that occurred at Jakobshavn Isbræ, Greenland. During calving events (1) the kinetic energy of the ice mélange is 2 orders of magnitude smaller than the total energy released during the events, (2) a jamming front propagates through the ice mélange at a rate that is an order of magnitude faster than the motion of individual icebergs, (3) the ice mélange undergoes initial compaction followed by slow relaxation and extension, and (4) motion of the ice mélange gradually decays before coming to an abrupt halt. These observations indicate that the ice mélange experiences widespread jamming during calving events and is always close to being in a jammed state during periods of terminus quiescence. We therefore suspect that local jamming influences longer timescale ice mélange dynamics and stress transmission.
Text
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More information
Accepted/In Press date: 2 February 2015
e-pub ahead of print date: 5 February 2015
Published date: 28 February 2015
Keywords:
glaciers, calving, icebergs, jamming
Organisations:
Aerodynamics & Flight Mechanics Group
Identifiers
Local EPrints ID: 385028
URI: http://eprints.soton.ac.uk/id/eprint/385028
ISSN: 0094-8276
PURE UUID: 1e3f93bf-ded0-4032-9ade-9c54ed82cf85
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Date deposited: 14 Jan 2016 16:52
Last modified: 15 Mar 2024 03:52
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Contributors
Author:
Jason M. Amundson
Author:
Ryan Cassotto
Author:
Mark Fahnestock
Author:
Kristopher N. Darnell
Author:
Martin Truffer
Author:
Wendy W. Zhang
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