Abstract:
In this transient electromagnetic survey, twenty-one soundings were acquired every 500 m along a 10 km long profile on Larsen C Ice Shelf, Antarctic Peninsula in December 2022. The transient electromagnetic data were acquired with a Geonics PROTEM47 system and a 4 x 100m square transmitter loop. The transient electromagnetic data were acquired to image the marine ice at the base of the Larsen C Ice Shelf in this suture zone, as part of the NERC-funded RiPIce (Rift Propagation for Ice sheet models) research project.
This project is funded by a NERC standard grant NE/T008016/1.
Keywords:
Antarctica, Larsen C Ice Shelf, marine ice, transient electromagnetic
Kulessa, B., Thompson, S., Miles, K., Luckman, A., & Hubbard, B. (2025). Transient electromagnetic survey from the southern sector of Larsen C Ice Shelf, Antarctic Peninsula, December 2022 (Version 1.0) [Data set]. NERC EDS UK Polar Data Centre. https://doi.org/10.5285/873edd47-f5c2-47cb-bf0c-3f45232536ca
| Access Constraints: | None. |
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| Use Constraints: | This data is covered by a UK Open Government Licence (http://www.nationalarchives.gov.uk/doc/open-government-licence/version/3/) |
| Creation Date: | 2025-03-24 |
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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 Polar Data Centre |
| Role(s) | Metadata Author |
| Organisation | British Antarctic Survey |
| Name | Bernd Kulessa |
| Role(s) | Investigator |
| Organisation | Swansea University |
| Name | Sarah Thompson |
| Role(s) | Investigator |
| Name | Dr Katie Miles |
| Role(s) | Investigator |
| Organisation | Lancaster University |
| Name | Dr Adrian Luckman |
| Role(s) | Investigator |
| Organisation | Swansea University |
| Name | Bryn Hubbard |
| Role(s) | Investigator |
| Organisation | Aberystwyth University |
| Parent Dataset: | N/A |
| Reference: | Paper submitted to Geophysical Research Letters in March 2025: Transient electromagnetic imaging of permeable marine ice at the base of Larsen C Ice Shelf, Antarctic Peninsula, by Siobhan Killingbeck, Bernd Kulessa, Katie E. Miles, Bryn Hubbard, Adrian Luckman, Sarah Thompson, Glenn Jones, Benjamin K. Galton-Fenzi | |
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| Quality: | Each sounding was recorded with an integration time of 30 second. Sounding numbers 1,2,4,6,9,12,18, and 20 did not measure any data above the background noise level and therefore no data was processed to received voltages for these soundings. |
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| Lineage/Methodology: | TEM data were acquired with a Geonics PROTEM47 system consisting of a three-channel digital time-domain receiver unit, a three component multi-turn receiver coil (area 31.4 m2), and a TEM47 battery-powered transmitter. A 4x100 m square transmitter loop was laid out and the receiver coil was placed in the center of the square. Twenty-one TEM soundings were acquired every 500 m along a 10 km long profile. At each location the transmitter module was used to power 2 A of current around the 4x100 m square transmitter loop. A base frequency of 25 Hz was acquired with 30 measurement time gates, 30 second integration time, and seven stacks. Furthermore, at each location the background noise was measured with the transmitter turned off. For all soundings above the background noise level the raw data was converted from the raw field measurements (in Volts) to received voltages in Volts per amp meter squared (V/Am2). The error was calculated as one standard deviation from all seven stacks. Sounding numbers 1,2,4,6,9,12,18, and 20 did not measure any data above the background noise level and therefore no data was processed to received voltages for these soundings. |
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| Temporal Coverage: | |
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| Start Date | 2022-11-29 |
| End Date | 2022-12-11 |
| Spatial Coverage: | |
| Latitude | |
| Southernmost | -68.04154 |
| Northernmost | -67.95819 |
| Longitude | |
| Westernmost | -64.43212 |
| Easternmost | -64.3256 |
| 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 |
| Data Collection: | The data were acquired using a Geonics PROTEM47 system consisting of a three-channel digital time-domain receiver unit, a three component multi-turn receiver coil (area 31.4 m2), and a TEM47 battery-powered transmitter. |
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| Distribution: | |
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| Distribution Media | Online Internet (HTTP) |
| Distribution Size | 52 kB |
| Distribution Format | ASCII |
| Fees | N/A |
| Data Storage: | This dataset consists of 5 csv files (total 17 KB): 1. TEM location - lat/long coordinates of each soundings 2. TEM_timegates - measurement times, in milliseconds, for the 30 time gates recorded at each sounding location. 3. TEM_received_voltages - measured received voltages for each sounding in V/Am^2 4. TEM_received_voltages_error - one standard deviation in V/Am^2 5. TEM_background noise - measured background noise with the transmitter turned off in V/Am^2. |