Please use this identifier to cite or link to this item: https://oar.tib.eu/jspui/handle/123456789/682
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dc.rights.licenseCC BY 3.0 Unportedger
dc.contributor.authorAlbrecht, T.
dc.contributor.authorLevermann, A.
dc.date.accessioned2018-09-01T12:07:08Z
dc.date.available2019-06-26T17:19:27Z
dc.date.issued2014
dc.identifier.urihttps://oar.tib.eu/jspui/handle/123456789/682
dc.identifier.urihttp://dx.doi.org/10.34657/969-
dc.description.abstractFloating ice shelves can exert a retentive and hence stabilizing force onto the inland ice sheet of Antarctica. However, this effect has been observed to diminish by the dynamic effects of fracture processes within the protective ice shelves, leading to accelerated ice flow and hence to a sea-level contribution. In order to account for the macroscopic effect of fracture processes on large-scale viscous ice dynamics (i.e., ice-shelf scale) we apply a continuum representation of fractures and related fracture growth into the prognostic Parallel Ice Sheet Model (PISM) and compare the results to observations. To this end we introduce a higher order accuracy advection scheme for the transport of the two-dimensional fracture density across the regular computational grid. Dynamic coupling of fractures and ice flow is attained by a reduction of effective ice viscosity proportional to the inferred fracture density. This formulation implies the possibility of non-linear threshold behavior due to self-amplified fracturing in shear regions triggered by small variations in the fracture-initiation threshold. As a result of prognostic flow simulations, sharp across-flow velocity gradients appear in fracture-weakened regions. These modeled gradients compare well in magnitude and location with those in observed flow patterns. This model framework is in principle expandable to grounded ice streams and provides simple means of investigating climate-induced effects on fracturing (e.g., hydro fracturing) and hence on the ice flow. It further constitutes a physically sound basis for an enhanced fracture-based calving parameterization.
dc.formatapplication/pdf
dc.formatapplication/zip
dc.languageeng
dc.publisherMünchen : European Geopyhsical Union
dc.relation.ispartofseriesThe Cryosphere, Volume 8, Issue 2, Page 587-605-
dc.rights.urihttps://creativecommons.org/licenses/by/3.0/ger
dc.subjectFracture
dc.subjectice flow
dc.subjectice sheet
dc.subjectice shelf
dc.subjectice stream
dc.subjectviscous flow
dc.subject.ddc550
dc.titleFracture-induced softening for large-scale ice dynamics
dc.typearticle-
dc.typeText-
dc.description.versionpublishedVersioneng
local.accessRightsopenAccess-
wgl.contributorPIKger
wgl.subjectGeowissenschaftenger
wgl.typeZeitschriftenartikelger
dc.relation.doihttps://doi.org/10.5194/tc-8-587-2014
dcterms.bibliographicCitation.journalTitleThe Cryosphere-
local.identifier.doihttp://dx.doi.org/10.34657/969-
Appears in Collections:Geowissenschaften

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