Incorporating modelled subglacial hydrology into inversions for basal drag
| Autor: | Neil Arnold, Conrad P. Koziol |
|---|---|
| Přispěvatelé: | Arnold, Neil [0000-0001-7538-3999], Apollo - University of Cambridge Repository |
| Jazyk: | angličtina |
| Rok vydání: | 2017 |
| Předmět: |
010504 meteorology & atmospheric sciences
Initialization 010502 geochemistry & geophysics 01 natural sciences Physics::Geophysics Meltwater Geomorphology Physics::Atmospheric and Oceanic Physics lcsh:Environmental sciences 0105 earth and related environmental sciences Earth-Surface Processes Water Science and Technology Hydrology lcsh:GE1-350 geography geography.geographical_feature_category lcsh:QE1-996.5 Inversion (meteorology) Glacier 37 Earth Sciences Water pressure 3709 Physical Geography and Environmental Geoscience Radar observations lcsh:Geology Drag Winter season Geology |
| Zdroj: | The Cryosphere, Vol 11, Pp 2783-2797 (2017) Koziol, C & Arnold, N 2017, ' Incorporating modelled subglacial hydrology into inversions for basal drag ', Cryosphere Discussions . https://doi.org/10.5194/tc-11-2783-2017 |
| ISSN: | 1994-0424 1994-0416 |
| DOI: | 10.5194/tc-11-2783-2017 |
| Popis: | 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. |
| Databáze: | OpenAIRE |
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