Abstract:
The dataset consists of GPS data recorded from four sites close to Halley VI Research Station, plus ApRES data across the rift from 2017-2019. Both data types provide information on the width of an active rift propagating through the ice shelf. GPS sites advect with flow of the ice shelf, while ApRES is repositioned each year. The data were collected as part of the Lifetime-of-Halley monitoring programme.
This work was funded by NERC grant NE/X014991/1 (RIFT-TIP) and supported by NERC Antarctic Logistics and Infrastructure.
Keywords:
GPS, Halley VI, calving, ice shelf, velocity
Marsh, O., & De Rydt, J. (2025). GPS and ApRES data relating to the growth of Chasm-1, Brunt Ice Shelf from 2016 to 2023 (Version 1.0) [Data set]. NERC EDS UK Polar Data Centre. https://doi.org/10.5285/3d6fd5ae-e94d-4d0b-a5e9-5779ca84855e
| Access Constraints: | Under embargo until publication of associated article. |
|---|---|
| Use Constraints: | Data supplied under Open Government Licence v3.0 http://www.nationalarchives.gov.uk/doc/open-government-licence/version/3/. |
| Creation Date: | 2025-04-03 |
|---|---|
| Dataset Progress: | Complete |
| Dataset Language: | English |
| ISO Topic Categories: |
|
| Parameters: |
|
| Personnel: | |
| Name | UK Polar Data Centre |
| Role(s) | Metadata Author |
| Organisation | British Antarctic Survey |
| Name | Oliver J Marsh |
| Role(s) | Investigator, Technical Contact |
| Organisation | British Antarctic Survey |
| Name | Jan De Rydt |
| Role(s) | Investigator |
| Organisation | Northumbria University |
| Parent Dataset: | N/A |
| Reference: | Ocean tides trigger ice shelf rift growth and calving, Oliver J. Marsh, Robert J. Arthern, Jan De Rydt (submitted). | |
|---|---|---|
| Quality: | Dual frequency Raw GPS data have been converted into 5 minute Rinex files. ApRES is in netCDF format. The GPS data are mostly available for each day, although with some gaps in austral winter (July/August). The ApRES data has a high signal to noise ratio (~30 dB) after initial set-up (i.e. in February and March). This generally decreases through the winter and the signal disappears around September each year. | |
| Lineage: | The GPS sites were installed between 2016 and 2017 and recorded for 2 hours 15 minutes each day at 30 second resolution. Data was converted from raw Leica format (*.m00) to standard Rinex v2 format using UNAVCO's teqc.exe program. The ApRES was installed in a horizontal configuration with antennas spaced approximately 15 m apart. A metal reflector was installed on the far side of the crack and the peak in reflection indicates the distance across the crack. The ApRES raw DAT format was converted to ApRES raw netCDF format using the bas-apres software (v0.3.0). Details in Marsh et al., 2024. | |
| Temporal Coverage: | |
|---|---|
| Start Date | 2016-01-01 |
| End Date | 2023-02-01 |
| Spatial Coverage: | |
| Latitude | |
| Southernmost | -75.6 |
| Northernmost | -75.4 |
| Longitude | |
| Westernmost | -25.7 |
| Easternmost | -25.5 |
| Altitude | |
| Min Altitude | N/A |
| Max Altitude | N/A |
| Depth | |
| Min Depth | N/A |
| Max Depth | N/A |
| Data Resolution: | |
| Latitude Resolution | N/A |
| Longitude Resolution | N/A |
| Horizontal Resolution Range | N/A |
| Vertical Resolution | N/A |
| Vertical Resolution Range | N/A |
| Temporal Resolution | N/A |
| Temporal Resolution Range | 1 minute - < 1 hour |
| Location: | |
| Location | Antarctica |
| Detailed Location | Brunt Ice Shelf, Halley VI Research Station |
| Sensor(s): |
|
|---|---|
| Data Collection: | Data collected using Leica GS10 and Leica GX1200 GPS and ApRES. |
| Distribution: | |
|---|---|
| Distribution Media | Online Internet (HTTP) |
| Distribution Size | 85 GB |
| Distribution Format | N/A |
| Fees | N/A |
| Data Storage: | Four directories containing GPS Rinex data from four different GPS sites. Three directories containing ApRES netCDF data from 2017, 2018 and 2019. |