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Incorporating modelled subglacial hydrology into inversions for basal drag

Published version
Peer-reviewed

Type

Article

Change log

Authors

Koziol, CP 

Abstract

jats:pAbstract. 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 modelled winter hydrological state to radar observations and find that it is in line with summer rather than winter observations.</jats:p>

Description

Keywords

37 Earth Sciences, 3709 Physical Geography and Environmental Geoscience

Journal Title

Cryosphere

Conference Name

Journal ISSN

1994-0416
1994-0424

Volume Title

11

Publisher

Copernicus GmbH
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