Mechanical and microstructural data from ice deformation experiments with a change in temperature partway

• Other Authors: AADC (originator), AU/AADC > Australian Antarctic Data Centre, Australia (resourceProvider)
• Format: Dataset
• Language: unknown
• Published: Australian Ocean Data Network
• Subjects: climatologyMeteorologyAtmosphere; oceans; ICE DEFORMATION; EARTH SCIENCE; CRYOSPHERE; SEA ICE; ICE MICROSTRUCTURE; ICE RHEOLOGY; ACFA > Automatic C-Axis Fabric Analyzer; LABORATORY; AMD; AMD/AU; ACE/CRC; CEOS; OCEAN > SOUTHERN OCEAN; CONTINENT > ANTARCTICA; GEOGRAPHIC REGION > POLAR; Southern Ocean; Antarc*; Antarctica; Sea ice
• Online Access: https://researchdata.edu.au/mechanical-microstructural-ice-temperature-partway/1603461; https://data.aad.gov.au/metadata/records/AAS_4289_temp_change; https://data.aad.gov.au/eds/5183/download; https://secure3.aad.gov.au/proms/public/projects/report_project_public.cfm?project_no=4289; https://data.aad.gov.au/aadc/metadata/citation.cfm?entry_id=AAS_4289_temp_change

Mechanical data contains sudden "steps" in displacement due to increases in applied load every few days during the experiments. These can be removed to avoid sudden spikes in strain rate. Microstructural data collected with a fabric analyser tend to contain artefacts at grain boundaries due to poor data quality. We removed these by filtering out very fine grains (less than 30 μm ), and elongated small grains (those with an aspect ratio less than 3 and equivalent radius less than 100 μm ), and artificially grew grains to fill the empty space. The fine-scale structure of grain boundaries therefore may not be accurate. Dates provided in temporal coverage correspond to the start and end of the project. Values provided in spatial coverage are approximate. This dataset contains data collected during and after a series of ice deformation experiments. Seven of the experiments are controls, run at a constant temperature of either -2, -7 or -10 degrees celsius, and four involve a change in temperature partway through the experiment. Vertical displacement and temperature data were collected during the experiments, and microstructural data (fabric analyser thin sections) were collected at the conclusion of each experiment. The experimental methods and our interpretations are described thoroughly in Craw, et al. (in prep). In folder mechanical_data: - One .csv file for each experiment containing a header with information on experimental conditions, and columns of data corresponding to time (hours), vertical displacement (mm), and temperature (degrees celsius) throughout the experiment. This is raw data, there will be points recorded from before weights were added at the beginning of the experiment, and after the temperature was lowered at the end. in folder microstructural_data: - One .mat file for each experiment, containing microstructural data (spatially indexed Euler orientations) formatted to be read by the MTEX toolbox (https://mtex-toolbox.github.io/). There is also a file for an example of the starting material, "standard" laboratory ice. These data are converted from the .cis files which are generated by the G50 fabric analyser. - One .m script (plot_microstructural_data.m) containing commands for plotting spatial maps, histograms of grain size distribution and pole figures of c-axis orientation from the .mat files in this directory. The purpose of this dataset is to establish if there are any lasting effects of previous deformation at higher temperatures on the strain rate and microstructural behaviour of deforming ice.