<> "The repository administrator has not yet configured an RDF license."^^ . <> . . "Crystal-orientation fabric variations on the cm-scale in cold Alpine ice: Interaction with paleo-climate proxies under deformation and implications for the interpretation of seismic velocities"^^ . "The macroscopic flow of a glacier is substantially influenced by the plastic anisotropy of individual ice crystals on the microscale. A preferred crystal orientation develops with depth in a glacier and is subjected to the influence of the temperature, deformation and recrystallisation regime as well as the climate-dependent impurity load in the ice. Detailed knowledge about the crystal anisotropy in a glacier is thus required to better constrain the response of ice sheets in a\r\nchanging climate. While the gradual change in anisotropy on a large scale of tens to hundreds of metres can mostly be explained, this is not the case for changes in anisotropic fabric on a shorter scale of centimetres to decimetres. This work aims to improve the understanding of how and why the anisotropic crystal-orientation fabric (COF) changes on a short scale in a glacier. Fabric data from an ice core, drilled at the high-altitude Alpine site Colle Gnifetti, were measured in continuously sampled sections, covering 10 % of the entire core length. The distribution of crystal axes was analysed in high-resolution together with impurity data from meltwater analysis. It is found that the fabric anisotropy exhibits a strong variability on the short scale in all depths of the ice core with extreme eigenvalue differences within one metre\r\nof ∼ 0.2, often associated with small- or large-grained layers. The clear connection between the grain size variation and the impurity content leads to the conclusion that the influence of impurities on short-scale fabric variations is partially conveyed by the impurity-controlled grain size in combination with the local deformation regime. To further connect ice-core fabric data and COF measurements using seismics, a framework for the exact calculation of seismic phase velocities based on the asymmetric fabric distributions obtained from ice cores is developed and evaluated in two case studies."^^ . "2016" . . . . . . . "Johanna Katharina"^^ . "Kerch"^^ . "Johanna Katharina Kerch"^^ . . . . . . "Crystal-orientation fabric variations on the cm-scale in cold Alpine ice: Interaction with paleo-climate proxies under deformation and implications for the interpretation of seismic velocities (PDF)"^^ . . . "Dissertation_Johanna_Kerch_2016_HeiDOK.pdf"^^ . . . "Crystal-orientation fabric variations on the cm-scale in cold Alpine ice: Interaction with paleo-climate proxies under deformation and implications for the interpretation of seismic velocities (Other)"^^ . . . . . . "lightbox.jpg"^^ . . . "Crystal-orientation fabric variations on the cm-scale in cold Alpine ice: Interaction with paleo-climate proxies under deformation and implications for the interpretation of seismic velocities (Other)"^^ . . . . . . "preview.jpg"^^ . . . "Crystal-orientation fabric variations on the cm-scale in cold Alpine ice: Interaction with paleo-climate proxies under deformation and implications for the interpretation of seismic velocities (Other)"^^ . . . . . . "medium.jpg"^^ . . . "Crystal-orientation fabric variations on the cm-scale in cold Alpine ice: Interaction with paleo-climate proxies under deformation and implications for the interpretation of seismic velocities (Other)"^^ . . . . . . "small.jpg"^^ . . . "Crystal-orientation fabric variations on the cm-scale in cold Alpine ice: Interaction with paleo-climate proxies under deformation and implications for the interpretation of seismic velocities (Other)"^^ . . . . . . "indexcodes.txt"^^ . . "HTML Summary of #22326 \n\nCrystal-orientation fabric variations on the cm-scale in cold Alpine ice: Interaction with paleo-climate proxies under deformation and implications for the interpretation of seismic velocities\n\n" . "text/html" . . . "530 Physik"@de . "530 Physics"@en . . . "550 Geowissenschaften"@de . "550 Earth sciences"@en . .