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dc.contributor.authorÅström, J.A.
dc.contributor.authorBenn, D.I.
dc.date.accessioned2020-05-19T23:34:19Z
dc.date.available2020-05-19T23:34:19Z
dc.date.issued2019-11-20
dc.identifier262777732
dc.identifierf7894529-fbcf-4e25-838f-eca7daf618f3
dc.identifier85075369664
dc.identifier000497261400001
dc.identifier.citationÅström , J A & Benn , D I 2019 , ' Effective rheology across the fragmentation transition for sea ice and ice shelves ' , Geophysical Research Letters , vol. Early View . https://doi.org/10.1029/2019GL084896en
dc.identifier.issn0094-8276
dc.identifier.otherRIS: urn:D1C2EBA06DF1EDF4FD2DD00E9E2ECEDC
dc.identifier.otherORCID: /0000-0002-3604-0886/work/65013950
dc.identifier.urihttps://hdl.handle.net/10023/19967
dc.descriptionFunding was provided by the NERC grant NE/P011365/1 Calving Laws for Ice Sheet Models CALISMO. Data files for the plots are found at: https://doi.org/10.5285/76D7D3CA-7B83-4BB0-AAE5-A8E92C7DA5B0en
dc.description.abstractSea ice and ice shelves can be described by a viscoelastic rheology that is approximately linear elastic and brittle at high strain rates, and viscously shear‐thinning at low strain rates. Brittle ice easily fractures under compressive shear and forms shear bands as the material undergoes a transition to a fragmented, granular state. This transition plays a central role in the mechanical behaviour at large scales of sea‐ice in the Arctic Ocean or Antarctic ice shelves. Here we demonstrate that the fragmentation transition is characterized by an essentially discontinuous drop of 3‐5 orders of magnitude in effective viscosity and stress‐relaxation time. Beyond the fragmentation transition, grinding in shear zones further reduces both effective viscosity and shear stiffness, but with an essentially constant relaxation time of ∼10second. These results are relevant for ice‐rheology implementation in large‐scale climate‐related models of sea ice and thin ice shelves.
dc.format.extent6188702
dc.language.isoeng
dc.relation.ispartofGeophysical Research Lettersen
dc.subjectIce shelvesen
dc.subjectSea iceen
dc.subjectModellingen
dc.subjectG Geography (General)en
dc.subjectDASen
dc.subjectSDG 13 - Climate Actionen
dc.subject.lccG1en
dc.titleEffective rheology across the fragmentation transition for sea ice and ice shelvesen
dc.typeJournal articleen
dc.contributor.sponsorNERCen
dc.contributor.institutionUniversity of St Andrews. School of Geography & Sustainable Developmenten
dc.contributor.institutionUniversity of St Andrews. Bell-Edwards Geographic Data Instituteen
dc.identifier.doi10.1029/2019GL084896
dc.description.statusPeer revieweden
dc.date.embargoedUntil2020-05-20
dc.identifier.grantnumberNE-P011365/1en


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