Abstract:
These are digital optical televiewer logs of two boreholes drilled by hot water to 120 m (Site 1) and 160 m (Site 2) on Larsen C Ice Shelf, Antarctic Peninsula. Boreholes were drilled in December 2022 to investigate the internal properties of a suture zone (Site 1) and a meteoric ice band (Site 2) of an ice shelf, as part of the NERC-funded RiPIce (Rift Propagation for Ice sheet models) research project.
NERC standard grant NE/T008016/1.
Keywords:
Antarctica, Larsen C, ice borehole, optical televiewer
Hubbard, B., Miles, K., & RiPIce Project Team (2024). Borehole optical televiewer logs from the southern sector of Larsen C Ice Shelf, Antarctic Peninsula, November-December 2022 (Version 1.0) [Data set]. NERC EDS UK Polar Data Centre. https://doi.org/10.5285/957fb0bd-6d51-46fc-b4fa-731d21731eda
| Access Constraints: | No restrictions apply. |
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| Use Constraints: | Data supplied under Open Government Licence v3.0 http://www.nationalarchives.gov.uk/doc/open-government-licence/version/3/. |
| Creation Date: | 2024-12-12 |
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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 | Bryn Hubbard |
| Role(s) | Investigator, Technical Contact |
| Organisation | Aberystwyth University |
| Name | Katie Miles |
| Role(s) | Investigator |
| Organisation | Aberystwyth University |
| Name | RiPIce project team |
| Role(s) | Investigator |
| Organisation | RiPIce project |
| Parent Dataset: | N/A |
| Reference: | Hubbard B, Roberson S, Samyn D, Merton-Lyn D. Digital optical televiewing of ice boreholes. Journal of Glaciology. 2008;54(188):823-830. https://doi.org/10.3189/002214308787779988. | |
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| Quality: | Images are unaltered from those logged in the field. The OPTV technique is described by Hubbard et al. (2008). | |
| Lineage: | The datasets are optical televiewer logs from two boreholes drilled to 120 m (Site 1) and 160 m (Site 2) on Larsen C Ice Shelf, Antarctica, in December 2022. They were acquired using a slim-hole optical televiewer borehole probe manufactured by Robertson Geologging Ltd, comprising a 360 degree camera. Boreholes were logged whilst the optical televiewer was travelling up the borehole. The optical televiewer has internal LEDs to illuminate the borehole wall, indicated by a % lighting level controlled by the user. Lighting changes were made whilst logging, as follows: RiPIce OPTV Site1 Depth (m),Lighting (%) 25.74 - 45.58,60 45.58 - 45.61,55 45.61 - 48.80,80 48.80 - 54.08,85 54.08 - 57.97,90 57.97 - 82.40,95 82.40 - 82.94,90 82.94 - 88.25,100 88.25 - 88.34,95 88.34 - 88.76,90 88.76 - 119.94,100 RiPICE OPTV Site2 Depth (m),Lighting (%) 1.97 - 50.30,50 50.30 - 69.90,70 69.90 - 159.97,90 |
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| Temporal Coverage: | |
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| Start Date | 2022-12-02 |
| End Date | 2022-12-02 |
| Start Date | 2022-12-06 |
| End Date | 2022-12-06 |
| Spatial Coverage: | |
| Latitude | |
| Southernmost | -68.0408 |
| Northernmost | -68.0408 |
| Longitude | |
| Westernmost | -64.3236 |
| Easternmost | -64.3236 |
| Altitude | |
| Min Altitude | N/A |
| Max Altitude | 53 m |
| Depth | |
| Min Depth | 0 m |
| Max Depth | 160 m |
| Latitude | |
| Southernmost | -68.0086 |
| Northernmost | -68.0086 |
| Longitude | |
| Westernmost | -64.3668 |
| Easternmost | -64.3668 |
| Altitude | |
| Min Altitude | N/A |
| Max Altitude | 50.251 m |
| Depth | |
| Min Depth | 0 m |
| Max Depth | 120 m |
| Data Resolution: | |
| Latitude Resolution | N/A |
| Longitude Resolution | N/A |
| Horizontal Resolution Range | N/A |
| Vertical Resolution | 1 mm |
| Vertical Resolution Range | N/A |
| Temporal Resolution | N/A |
| Temporal Resolution Range | N/A |
| Location: | |
| Location | Antarctica |
| Detailed Location | Larsen C ice shelf |
| Data Collection: | Logs were acquired using Robertson Geologging OPTV probe, mini winch and Micrologger II. |
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| Distribution: | |
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| Distribution Media | Online Internet (HTTP) |
| Distribution Size | 441 MB |
| Distribution Format | N/A |
| Fees | N/A |
| Data Storage: | The data are bitmap images (*.bmp format). The file name consists of RIPICE, the site number, and OPTV for optical televiewer. |