Abstract:
Ground penetrating radar (GPR) data were acquired at a site on Antarctica's Larsen C Ice Shelf, in November 2017. The acquisition was performed to measure radar anisotropy, a potential proxy for the stress condition in the upper ice shelf, following the calving of Iceberg A68 in July 2017. Two GPR common midpoint (CMP) gathers were acquired at Site S2, a site previously surveyed during the NERC funded NE/E013414/1 SOLIS project. These gathers were acquired first with GPR antennas extended in the flow-parallel direction (~ east), and then in the flow-orthogonal direction. The GPR system is a Sensors & Software pulseEKKO PRO, with 200 MHZ antennas. All acquisitions were performed by Dr Jim White (British Geological Survey) and Emma Pearce (University of Leeds, School of Earth and Environment), with support from BAS.
The data is part of the NERC RACE project, NE/R012334/1.
Keywords:
Larsen, anisotropy, calving, ground penetrating radar, ice shelf
Booth, A., White, J., Pearce, E., Cornford, S., Brisbourne, A., Luckman, A., & Kulessa, B. (2019). Ground penetrating radar common-midpoint gathers from Antarctica's Larsen C Ice Shelf, Nov 2017, following the calving of Iceberg A68 (Version 1.0) [Data set]. UK Polar Data Centre, Natural Environment Research Council, UK Research & Innovation. https://doi.org/10.5285/4e94de3b-e156-4f6f-a854-8edeaa4e8302
| Access Constraints: | No restrictions apply. |
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| Use Constraints: | This data is governed by the NERC data policy http://www.nerc.ac.uk/research/sites/data/policy/ and supplied under Open Government Licence v.3 http://www.nationalarchives.gov.uk/doc/open-government-licence/version/3/. |
| Creation Date: | 2019-08-14 |
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| Dataset Progress: | Complete |
| Dataset Language: | English |
| ISO Topic Categories: |
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| Parameters: |
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| Personnel: | |
| Name | UK PDC |
| Role(s) | Metadata Author |
| Organisation | British Antarctic Survey |
| Name | Adam Booth |
| Role(s) | Investigator, Technical Contact |
| Organisation | University of Leeds |
| Name | Jim White |
| Role(s) | Investigator |
| Organisation | British Geological Survey |
| Name | Emma Pearce |
| Role(s) | Investigator |
| Organisation | University of Leeds |
| Name | Adrian Luckman |
| Role(s) | Investigator |
| Organisation | Swansea University |
| Name | Alex M Brisbourne |
| Role(s) | Investigator |
| Organisation | British Antarctic Survey |
| Name | Stephen Cornford |
| Role(s) | Investigator |
| Organisation | Swansea University |
| Name | Bernd Kulessa |
| Role(s) | Investigator |
| Organisation | Swansea University |
| Name | Bryn Hubbard |
| Role(s) | Investigator |
| Organisation | Aberystwyth University |
| Parent Dataset: | N/A |
| Reference: | Booth AD, Luckman AJ, White J, Pearce E, Cornford SL, Kulessa B, Brisbourne AM and Hubbard B (2018). Mechanical response of Larsen C Ice Shelf following the A68 calving event: observations from field-based geophysical measurements. Geophysical Research Abstracts, 20, EGU-2018-10049, EGU General Assembly 2018. https://meetingorganizer.copernicus.org/EGU2018/EGU2018-10049.pdf | |
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| Quality: | No issues with data quality; both CMP gathers show clear hyperbolic reflections from within the firn column. No issues with antenna mislocation or static artefacts: the first-break of the airwave defines the expected velocity of 0.3 m/ns. | |
| Lineage: | GPR data were recorded using a Sensors & Software pulseEKKO PRO, with 200 MHZ antennas. Both CMP gathers are 1000 ns long, with a temporal sampling interval of 0.2 ns. The minimum offset and trace interval in each CMP gather is 1 m; throughout, antennas are orientated in a broadside configuration, but the direction of their extension changes. LINE00 is orientated such that antennas extend in an ~easterly flow-parallel direction, whereas LINE01 is orthogonal. The acquisition is fully documented within the Observer's Logs which accompany these data, and in the headers of each file. | |
| Temporal Coverage: | |
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| Start Date | 2017-11-23 |
| End Date | 2017-11-23 |
| Spatial Coverage: | |
| Latitude | |
| Southernmost | -68.0041 |
| Northernmost | -68.0041 |
| Longitude | |
| Westernmost | -62.56891 |
| Easternmost | -62.56891 |
| Altitude | |
| Min Altitude | N/A |
| Max Altitude | N/A |
| Depth | |
| Min Depth | N/A |
| Max Depth | N/A |
| Location: | |
| Location | Antarctica |
| Detailed Location | Larsen C Ice Shelf, Antarctic Peninsula |
| Data Collection: | Sensors & Software pulseEKKO PRO, with 200 MHZ antennas. |
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| Data Storage: | All GPR data were supplied in raw pulseEKKO format (.dt1 extension, with a .hd header), and converted to netCDF files. Each file is a single CMP gather. |
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