Laser Ultrasound Observations of Mechanical Property Variations in Ice Cores
The study of climate records in ice cores requires an accurate determination of annual layering within the cores in order to establish a depth-age relationship. Existing tools to delineate these annual layers are based on observations of changes in optical, chemical, and electromagnetic properties....
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ftboisestateu:oai:scholarworks.boisestate.edu:geo_facpubs-1356 2023-10-29T02:31:42+01:00 Laser Ultrasound Observations of Mechanical Property Variations in Ice Cores Mikesell, Thomas Dylan van Wijk, Kasper Otheim, Larry Thomas Marshall, Hans-Peter Kurbatov, Andrei 2017-01-01T08:00:00Z application/pdf https://scholarworks.boisestate.edu/geo_facpubs/353 https://scholarworks.boisestate.edu/context/geo_facpubs/article/1356/viewcontent/mikesell_dylan_laser_ultrasound_observations_pub.pdf unknown ScholarWorks https://scholarworks.boisestate.edu/geo_facpubs/353 https://scholarworks.boisestate.edu/context/geo_facpubs/article/1356/viewcontent/mikesell_dylan_laser_ultrasound_observations_pub.pdf This document was originally published in G eosciences by Multidisciplinary Digital Publishing Institute (MDPI). This work is provided under a Creative Commons Attribution 4.0 license. Details regarding the use of this work can be found at: http://creativecommons.org/licenses/by/4.0/ . doi: 10.3390/geosciences7030047 Geosciences Faculty Publications and Presentations ice core stratigraphy anisotropy laser ultrasonics ice fabric CGISS Earth Sciences Geophysics and Seismology text 2017 ftboisestateu 2023-09-29T15:16:13Z The study of climate records in ice cores requires an accurate determination of annual layering within the cores in order to establish a depth-age relationship. Existing tools to delineate these annual layers are based on observations of changes in optical, chemical, and electromagnetic properties. In practice, no single technique captures every layer in all circumstances. Therefore, the best estimates of annual layering are produced by analyzing a combination of measurable ice properties. We present a novel and complimentary elastic wave remote sensing method based on laser ultrasonics. This method is used to measure variations in ultrasonic wave arrival times and velocity along the core with millimeter resolution. The laser ultrasound system does not require contact with the ice core and is non-destructive. Custom optical windows allow the source and receiver lasers to be located outside the cold room, while the core is scanned by moving it with a computer-controlled stage. We present results from Antarctic firn and ice cores that lack visual evidence of a layered structure, but do show travel-time and velocity variations. In the future, these new data may be used to infer stratigraphic layers from elastic parameter variations within an ice core, as well as analyze ice crystal fabrics. Text Antarc* Antarctic ice core Boise State University: Scholar Works |
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Boise State University: Scholar Works |
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ftboisestateu |
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topic |
ice core stratigraphy anisotropy laser ultrasonics ice fabric CGISS Earth Sciences Geophysics and Seismology |
spellingShingle |
ice core stratigraphy anisotropy laser ultrasonics ice fabric CGISS Earth Sciences Geophysics and Seismology Mikesell, Thomas Dylan van Wijk, Kasper Otheim, Larry Thomas Marshall, Hans-Peter Kurbatov, Andrei Laser Ultrasound Observations of Mechanical Property Variations in Ice Cores |
topic_facet |
ice core stratigraphy anisotropy laser ultrasonics ice fabric CGISS Earth Sciences Geophysics and Seismology |
description |
The study of climate records in ice cores requires an accurate determination of annual layering within the cores in order to establish a depth-age relationship. Existing tools to delineate these annual layers are based on observations of changes in optical, chemical, and electromagnetic properties. In practice, no single technique captures every layer in all circumstances. Therefore, the best estimates of annual layering are produced by analyzing a combination of measurable ice properties. We present a novel and complimentary elastic wave remote sensing method based on laser ultrasonics. This method is used to measure variations in ultrasonic wave arrival times and velocity along the core with millimeter resolution. The laser ultrasound system does not require contact with the ice core and is non-destructive. Custom optical windows allow the source and receiver lasers to be located outside the cold room, while the core is scanned by moving it with a computer-controlled stage. We present results from Antarctic firn and ice cores that lack visual evidence of a layered structure, but do show travel-time and velocity variations. In the future, these new data may be used to infer stratigraphic layers from elastic parameter variations within an ice core, as well as analyze ice crystal fabrics. |
format |
Text |
author |
Mikesell, Thomas Dylan van Wijk, Kasper Otheim, Larry Thomas Marshall, Hans-Peter Kurbatov, Andrei |
author_facet |
Mikesell, Thomas Dylan van Wijk, Kasper Otheim, Larry Thomas Marshall, Hans-Peter Kurbatov, Andrei |
author_sort |
Mikesell, Thomas Dylan |
title |
Laser Ultrasound Observations of Mechanical Property Variations in Ice Cores |
title_short |
Laser Ultrasound Observations of Mechanical Property Variations in Ice Cores |
title_full |
Laser Ultrasound Observations of Mechanical Property Variations in Ice Cores |
title_fullStr |
Laser Ultrasound Observations of Mechanical Property Variations in Ice Cores |
title_full_unstemmed |
Laser Ultrasound Observations of Mechanical Property Variations in Ice Cores |
title_sort |
laser ultrasound observations of mechanical property variations in ice cores |
publisher |
ScholarWorks |
publishDate |
2017 |
url |
https://scholarworks.boisestate.edu/geo_facpubs/353 https://scholarworks.boisestate.edu/context/geo_facpubs/article/1356/viewcontent/mikesell_dylan_laser_ultrasound_observations_pub.pdf |
genre |
Antarc* Antarctic ice core |
genre_facet |
Antarc* Antarctic ice core |
op_source |
Geosciences Faculty Publications and Presentations |
op_relation |
https://scholarworks.boisestate.edu/geo_facpubs/353 https://scholarworks.boisestate.edu/context/geo_facpubs/article/1356/viewcontent/mikesell_dylan_laser_ultrasound_observations_pub.pdf |
op_rights |
This document was originally published in G eosciences by Multidisciplinary Digital Publishing Institute (MDPI). This work is provided under a Creative Commons Attribution 4.0 license. Details regarding the use of this work can be found at: http://creativecommons.org/licenses/by/4.0/ . doi: 10.3390/geosciences7030047 |
_version_ |
1781052438041591808 |