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dc.contributor.author
Raymond, Mélanie J.
dc.contributor.author
Gudmundsson, Gudmundur H.
dc.date.accessioned
2019-05-14T10:07:20Z
dc.date.available
2017-06-14T13:36:59Z
dc.date.available
2019-05-14T10:07:20Z
dc.date.issued
2009
dc.identifier.issn
1994-0416
dc.identifier.issn
1994-0424
dc.identifier.other
10.5194/tc-3-265-2009
en_US
dc.identifier.uri
http://hdl.handle.net/20.500.11850/157988
dc.identifier.doi
10.3929/ethz-b-000157988
dc.description.abstract
We propose a new approach to indirectly estimate basal properties of ice streams, i.e. bedrock topography and basal slipperiness, from observations of surface topography and surface velocities. We demonstrate how a maximum a posteriori estimate of basal conditions can be determined using a Bayesian inference approach in a combination with an analytical linearisation of the forward model. Using synthetic data we show that for non-linear media and non-linear sliding law only a few forward-step model evaluations are needed for convergence. The forward step is solved with a numerical finite-element model using the full Stokes equations. The Fréchet derivative of the forward function is approximated through analytical small-perturbation solutions. This approximation is a key feature of the method and the effects of this approximation on model performance are analyzed. The number of iterations needed for convergence increases with the amplitude of the basal perturbations, but generally less than ten iterations are needed.
en_US
dc.format
application/pdf
en_US
dc.language.iso
en
en_US
dc.publisher
Copernicus Publications
en_US
dc.rights.uri
http://creativecommons.org/licenses/by/3.0/
dc.title
Estimating basal properties of ice streams from surface measurements: a non-linear Bayesian inverse approach applied to synthetic data
en_US
dc.type
Journal Article
dc.rights.license
Creative Commons Attribution 3.0 Unported
dc.date.published
2009-12-23
ethz.journal.title
The Cryosphere
ethz.journal.volume
3
en_US
ethz.journal.issue
2
en_US
ethz.pages.start
265
en_US
ethz.pages.end
278
en_US
ethz.version.deposit
publishedVersion
en_US
ethz.identifier.wos
ethz.publication.place
Göttingen
en_US
ethz.publication.status
published
en_US
ethz.date.deposited
2017-06-14T13:39:10Z
ethz.source
ECIT
ethz.identifier.importid
imp59364cf2c86e413409
ethz.ecitpid
pub:36509
ethz.eth
yes
en_US
ethz.availability
Open access
en_US
ethz.rosetta.installDate
2017-07-12T20:49:34Z
ethz.rosetta.lastUpdated
2019-05-14T10:07:30Z
ethz.rosetta.exportRequired
true
ethz.rosetta.versionExported
true
ethz.COinS
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