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dc.contributor.author
Hellmann, Sebastian
dc.contributor.author
Kerch, Johanna
dc.contributor.author
Weikusat, Ilka
dc.contributor.author
Bauder, Andreas
dc.contributor.author
Grab, Melchior
dc.contributor.author
Jouvet, Guillaume
dc.contributor.author
Schwikowski, Margit
dc.contributor.author
Maurer, Hansruedi
dc.date.accessioned
2021-03-15T20:49:09Z
dc.date.available
2021-03-14T05:19:49Z
dc.date.available
2021-03-15T20:49:09Z
dc.date.issued
2021
dc.identifier.issn
1994-0416
dc.identifier.issn
1994-0424
dc.identifier.other
10.5194/tc-15-677-2021
en_US
dc.identifier.uri
http://hdl.handle.net/20.500.11850/474292
dc.identifier.doi
10.3929/ethz-b-000474292
dc.description.abstract
Crystal orientation fabric (COF) analysis provides information about the c-axis orientation of ice grains and the associated anisotropy and microstructural information about deformation and recrystallisation processes within the glacier. This information can be used to introduce modules that fully describe the microstructural anisotropy or at least direction-dependent enhancement factors for glacier modelling. The COF was studied at an ice core that was obtained from the temperate Rhonegletscher, located in the central Swiss Alps. Seven samples, extracted at depths between 2 and 79 m, were analysed with an automatic fabric analyser. The COF analysis revealed conspicuous four-maxima patterns of the c-axis orientations at all depths. Additional data, such as microstructural images, produced during the ice sample preparation process, were considered to interpret these patterns. Furthermore, repeated high-precision global navigation satellite system (GNSS) surveying allowed the local glacier flow direction to be determined. The relative movements of the individual surveying points indicated longitudinal compressive stresses parallel to the glacier flow. Finally, numerical modelling of the ice flow permitted estimation of the local stress distribution. An integrated analysis of all the data sets provided indications and suggestions for the development of the four-maxima patterns. The centroid of the four-maxima patterns of the individual core samples and the coinciding maximum eigenvector approximately align with the compressive stress directions obtained from numerical modelling with an exception for the deepest sample. The clustering of the c axes in four maxima surrounding the predominant compressive stress direction is most likely the result of a fast migration recrystallisation. This interpretation is supported by air bubble analysis of large-area scanning macroscope (LASM) images. Our results indicate that COF studies, which have so far predominantly been performed on cold ice samples from the polar regions, can also provide valuable insights into the stress and strain rate distribution within temperate glaciers.
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/4.0/
dc.title
Crystallographic analysis of temperate ice on Rhonegletscher, Swiss Alps
en_US
dc.type
Journal Article
dc.rights.license
Creative Commons Attribution 4.0 International
dc.date.published
2021-02-12
ethz.journal.title
The Cryosphere
ethz.journal.volume
15
en_US
ethz.journal.issue
2
en_US
ethz.pages.start
677
en_US
ethz.pages.end
694
en_US
ethz.version.deposit
publishedVersion
en_US
ethz.grant
Comprehensive 3D characterization of temperate alpine glaciers using geophysical techniques
en_US
ethz.identifier.wos
ethz.identifier.scopus
ethz.publication.place
Göttingen
en_US
ethz.publication.status
published
en_US
ethz.leitzahl
ETH Zürich::00002 - ETH Zürich::00012 - Lehre und Forschung::00007 - Departemente::02115 - Dep. Bau, Umwelt und Geomatik / Dep. of Civil, Env. and Geomatic Eng.::02611 - V. Wasserbau, Hydrologie u. Glaziologie / Lab. Hydraulics,Hydrology,Glaciology::09599 - Farinotti, Daniel / Farinotti, Daniel
ethz.leitzahl
ETH Zürich::00002 - ETH Zürich::00012 - Lehre und Forschung::00007 - Departemente::02330 - Dep. Erdwissenschaften / Dep. of Earth Sciences::02506 - Institut für Geophysik / Institute of Geophysics::03953 - Robertsson, Johan / Robertsson, Johan
ethz.leitzahl.certified
ETH Zürich::00002 - ETH Zürich::00012 - Lehre und Forschung::00007 - Departemente::02115 - Dep. Bau, Umwelt und Geomatik / Dep. of Civil, Env. and Geomatic Eng.::02611 - V. Wasserbau, Hydrologie u. Glaziologie / Lab. Hydraulics,Hydrology,Glaciology::09599 - Farinotti, Daniel / Farinotti, Daniel
ethz.leitzahl.certified
ETH Zürich::00002 - ETH Zürich::00012 - Lehre und Forschung::00007 - Departemente::02330 - Dep. Erdwissenschaften / Dep. of Earth Sciences::02506 - Institut für Geophysik / Institute of Geophysics::03953 - Robertsson, Johan / Robertsson, Johan
ethz.grant.agreementno
169329
ethz.grant.fundername
SNF
ethz.grant.funderDoi
10.13039/501100001711
ethz.grant.program
Projekte MINT
ethz.date.deposited
2021-03-14T05:20:19Z
ethz.source
SCOPUS
ethz.eth
yes
en_US
ethz.availability
Open access
en_US
ethz.rosetta.installDate
2021-03-15T20:49:36Z
ethz.rosetta.lastUpdated
2022-03-29T05:47:40Z
ethz.rosetta.versionExported
true
ethz.COinS
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