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dc.contributor.authorÅström, J.A.
dc.contributor.authorBenn, D.I.
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 .
dc.identifier.otherPURE: 262777732
dc.identifier.otherPURE UUID: f7894529-fbcf-4e25-838f-eca7daf618f3
dc.identifier.otherRIS: urn:D1C2EBA06DF1EDF4FD2DD00E9E2ECEDC
dc.identifier.otherORCID: /0000-0002-3604-0886/work/65013950
dc.identifier.otherScopus: 85075369664
dc.identifier.otherWOS: 000497261400001
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:
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.relation.ispartofGeophysical Research Lettersen
dc.rightsCopyright © 2019. American Geophysical Union. All Rights Reserved. . This work has been made available online in accordance with publisher policies or with permission. Permission for further reuse of this content should be sought from the publisher or the rights holder. This is the final published version of the work, which was originally published at
dc.subjectIce shelvesen
dc.subjectSea iceen
dc.subjectG Geography (General)en
dc.subjectSDG 13 - Climate Actionen
dc.titleEffective rheology across the fragmentation transition for sea ice and ice shelvesen
dc.typeJournal articleen
dc.description.versionPublisher PDFen
dc.contributor.institutionUniversity of St Andrews. School of Geography & Sustainable Developmenten
dc.contributor.institutionUniversity of St Andrews. Bell-Edwards Geographic Data Instituteen
dc.description.statusPeer revieweden

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