Journal cover Journal topic
The Cryosphere An interactive open-access journal of the European Geosciences Union
https://doi.org/10.5194/tc-2017-159
© Author(s) 2017. This work is distributed under
the Creative Commons Attribution 4.0 License.
Research article
11 Aug 2017
Review status
This discussion paper is a preprint. A revision of this manuscript was accepted for the journal The Cryosphere (TC) and is expected to appear here in due course.
Incorporating modelled subglacial hydrology into inversions for basal drag
Conrad P. Koziol1,a and Neil Arnold1 1Scott Polar Research Institute, Cambridge, UK
anow at: the University of Edinburgh
Abstract. A key challenge in modelling coupled ice flow – subglacial hydrology is initializing the state and parameters of the system. We address this problem by presenting a workflow for initializing these values at the start of a summer melt season. The workflow depends on running a subglacial hydrology model for the winter season, when the system is not forced by meltwater inputs, and ice velocities can be assumed constant. Key parameters of the winter run of the subglacial hydrology model are determined from an initial inversion for basal drag using a linear sliding law. The state of the subglacial hydrology model at the end of winter is incorporated into an inversion of basal drag using a non-linear sliding law which is a function of water pressure. We demonstrate this procedure in the Russell Glacier Area, and compare the output of the linear sliding law with two non-linear sliding laws. Additionally, we compare the winter output of a recent subglacial hydrology model to radar observations, and find that the modelled state of the subglacial hydrology system at the end of winter is in line with summer rather than winter observations.

Citation: Koziol, C. P. and Arnold, N.: Incorporating modelled subglacial hydrology into inversions for basal drag, The Cryosphere Discuss., https://doi.org/10.5194/tc-2017-159, in review, 2017.
Conrad P. Koziol and Neil Arnold
Interactive discussionStatus: closed
AC: Author comment | RC: Referee comment | SC: Short comment | EC: Editor comment
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RC1: 'Review', Anonymous Referee #1, 30 Aug 2017 Printer-friendly Version 
AC1: 'Reply to Reviewer 1', Conrad Koziol, 16 Oct 2017 Printer-friendly Version Supplement 
 
RC2: 'Review #2', Anonymous Referee #2, 02 Oct 2017 Printer-friendly Version 
AC2: 'Reply to Reviewer 2', Conrad Koziol, 16 Oct 2017 Printer-friendly Version Supplement 
Conrad P. Koziol and Neil Arnold
Conrad P. Koziol and Neil Arnold

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Short summary
We develop a new ice sheet model and couple it to an existing subglacial hydrology model. A workflow for initializing the coupled model at the start of summer is proposed and demonstrated on the Russell Glacier area of Western Greenland. This is a first step towards modelling ice velocities during the summer.
We develop a new ice sheet model and couple it to an existing subglacial hydrology model. A...
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