Direct reconstruction of glacier bedrock from known free sur

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TitleDirect reconstruction of glacier bedrock from known free surface data using the one-dimensional shallow ice approximationAbstractGlaciers are an important component of the climate system that respond sensitively to climate change. Small glaciers respond more quickly to changing weather patterns compared to large polar ice sheets and ice caps that make them ideal to study climate variability. This study relates to the numerical reconstruction of the glacier bed in order to generate basal boundary data for ice flow models. Bedrock elevation is a paramount input parameter in glacier flow modeling to accurately capture its flow dynamics but is difficult to measure. We present an easy to implement direct numerical and analytical methodology to infer the bedrock geometry under glacial ice from the knowledge of the free surface elevation or the free surface velocity in one space dimension. The numerical and analytical methods are both based on the shallow ice approximation and require the time series of the surface mass balance distribution. Moreover, the analytical method requires the knowledge of the glacier thickness at one arbitrary location. Numerical benchmark test cases are used to verify the suitability and applicability of the algorithms, and a sensitivity analysis demonstrates the robustness of the method. Â© 2014 Elsevier B.V.Funding DetailsFRG11-24, Royal Society of New Zealand; NZL 11/012, BMBF, Bundesministerium fÃ¼r Bildung und Forschung

Details

1st AuthorGessese, A. AuthorGessese, A.Heining, C.Sellier, M.Mc Nish, R.Rack, W.Year2015JournalGeomorphologyVolume228Pages356-371DOI10.1016/j.geomorph.2014.09.015URLhttps://www.scopus.com/inward/recor.....f77d3ea3eb394a3958a32f682PublisherElsevierKeywordsalgorithmanalytical methodbedrockelevationglacierglacier flowice flowinverse problemmass balancenumerical methodnumerical modelsensitivity analysistime seriestopographyAuthor KeywordsBed topographyFree surface dataInverse problemShallow ice approximationProgrammeK053 - Investigation of Snow and Ice Properties at Land and Sea to Improve Remotely Sensed Mass Balance Observations

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CitationGessese, A., Heining, C., Sellier, M., Mc Nish, R. and Rack, W. (2015). Direct reconstruction of glacier bedrock from known free surface data using the one-dimensional shallow ice approximation. Geomorphology, 228:356-371

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Programme

K053 - Investigation of Snow and Ice Properties at Land and Sea to Improve Remotely Sensed Mass Balance Observations