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Surface melt driven summer diurnal and winter multi-day stick-slip motion and till sedimentology

Surface melt driven summer diurnal and winter multi-day stick-slip motion and till sedimentology
Surface melt driven summer diurnal and winter multi-day stick-slip motion and till sedimentology
Fluctuations in glacier motion are very common and are thought to be controlled by subglacial hydrology and till deformation. There are few instrumented studies that have monitored seasonal changes. We use the innovative Glacsweb subglacial in situ wireless probes, combined with dGPS and custom geophone data from an Icelandic soft-bedded temperate glacier, to show that there are two distinct seasonal styles of speed-up events. Relatively small diurnal events occur during the melt season, whilst during winter there are larger multi-day events related to positive degree days. These events are accompanied by a distinct pattern of till deformation and basal icequakes. We argue these reflect stick-slip motion which occurs when the glacier hydrological system is unable to accommodate the melt water flux generated by surface melt episodes. We show a rare fully instrumented coupled glacier/till record of contrasting summer and winter stick-slip motion and discuss its implication for till sedimentology.
2041-1723
1-11
Hart, Jane K.
e949a885-7b26-4544-9e15-32ba6f87e49a
Martinez, Kirk
5f711898-20fc-410e-a007-837d8c57cb18
Basford, Philip J.
efd8fbec-4a5f-4914-bf29-885b7f4677a7
Clayton, Alexander I.
bb78b742-1324-4aa1-b6af-f75a1e60e01c
Robson, Benjamin A.
4432ff6d-4bcf-40cf-9bfc-5e9d5fd58461
Young, David S.
05bfdb8c-9675-470a-9dcb-5af247e1b4ca
Hart, Jane K.
e949a885-7b26-4544-9e15-32ba6f87e49a
Martinez, Kirk
5f711898-20fc-410e-a007-837d8c57cb18
Basford, Philip J.
efd8fbec-4a5f-4914-bf29-885b7f4677a7
Clayton, Alexander I.
bb78b742-1324-4aa1-b6af-f75a1e60e01c
Robson, Benjamin A.
4432ff6d-4bcf-40cf-9bfc-5e9d5fd58461
Young, David S.
05bfdb8c-9675-470a-9dcb-5af247e1b4ca

Hart, Jane K., Martinez, Kirk, Basford, Philip J., Clayton, Alexander I., Robson, Benjamin A. and Young, David S. (2019) Surface melt driven summer diurnal and winter multi-day stick-slip motion and till sedimentology. Nature Communications, 10, 1-11. (doi:10.1038/s41467-019-09547-6).

Record type: Article

Abstract

Fluctuations in glacier motion are very common and are thought to be controlled by subglacial hydrology and till deformation. There are few instrumented studies that have monitored seasonal changes. We use the innovative Glacsweb subglacial in situ wireless probes, combined with dGPS and custom geophone data from an Icelandic soft-bedded temperate glacier, to show that there are two distinct seasonal styles of speed-up events. Relatively small diurnal events occur during the melt season, whilst during winter there are larger multi-day events related to positive degree days. These events are accompanied by a distinct pattern of till deformation and basal icequakes. We argue these reflect stick-slip motion which occurs when the glacier hydrological system is unable to accommodate the melt water flux generated by surface melt episodes. We show a rare fully instrumented coupled glacier/till record of contrasting summer and winter stick-slip motion and discuss its implication for till sedimentology.

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s41467-019-09547-6 - Version of Record
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More information

Accepted/In Press date: 13 March 2019
e-pub ahead of print date: 8 April 2019
Published date: 8 April 2019

Identifiers

Local EPrints ID: 430198
URI: https://eprints.soton.ac.uk/id/eprint/430198
ISSN: 2041-1723
PURE UUID: 53b266cd-458c-48b2-8e91-4693d3d8ee85
ORCID for Jane K. Hart: ORCID iD orcid.org/0000-0002-2348-3944
ORCID for Kirk Martinez: ORCID iD orcid.org/0000-0003-3859-5700
ORCID for Philip J. Basford: ORCID iD orcid.org/0000-0001-6058-8270

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Date deposited: 16 Apr 2019 16:30
Last modified: 01 May 2019 00:38

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Contributors

Author: Jane K. Hart ORCID iD
Author: Kirk Martinez ORCID iD
Author: Alexander I. Clayton
Author: Benjamin A. Robson
Author: David S. Young

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