Abstract:
A time series of surface ice flow speed at a point on Thwaites Glacier, West Antarctica. The point is on grounded ice and is upstream of a sub-shelf cavity on the west flank of the fast-moving core of Thwaites Glacier. There are a total of 589 points. First column = yyyy-mm-dd, second column = speed in kilometres per year.
The work was funded by NERC projects NE/P011365/1 and NE/S006605/1.
Keywords:
ITGC, Thwaites Glacier, ice surface speed, point data
Bevan, S., Luckman, A., & Benn, D. (2021). Thwaites Glacier time series ice surface flow speeds at (107.09 W, 75.48 S) from January 2012 to December 2020 (Version 1.0) [Data set]. NERC EDS UK Polar Data Centre. https://doi.org/10.5285/c0c1050a-2360-4464-9b0f-c2c101e5d1c2
| 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: | 2021-05-25 |
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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 | Suzanne Bevan |
| Role(s) | Investigator, Technical Contact |
| Organisation | Swansea University |
| Name | Adrian Luckman |
| Role(s) | Investigator |
| Organisation | Swansea University |
| Name | Douglas Benn |
| Role(s) | Investigator |
| Organisation | University of St Andrews |
| Parent Dataset: | N/A |
| Reference: | Bevan, S. L., Luckman, A. J., Benn, D. I., Adusumilli, S., and Crawford, A.: Brief communication: Thwaites Glacier cavity evolution, The Cryosphere, 15, 3317-3328, https://doi.org/10.5194/tc-15-3317-2021, 2021. Liu, H., K. C. Jezek, B. Li, and Z. Zhao. 2015. Radarsat Antarctic Mapping Project Digital Elevation Model, Version 2. Boulder, Colorado USA. NASA National Snow and Ice Data Center Distributed Active Archive Center. doi: https://doi.org/10.5067/8JKNEW6BFRVD. |
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| Quality: | All feature-tracked displacements were filtered twice: first by a signal to noise ratio based on the cross-correlation of image patches, and then according to deviation from the mean displacement within a neighbourhood. The displacements were converted from the SAR image geometry to ground range geometry, and the results geocoded using the RAMP DEM (Liu et al., 2015). | |
| Lineage: | From 2012 to 2014 speeds were measured using feature-tracking of TerraSAR-X image pairs separated by 11 days. TerraSAR-X images were supplied by DLR. Speeds from 2015 onwards were measured using feature-tracking of Sentinel-1A and Sentinel-1B images separated by 6 or 12 days. Sentinel images were supplied by ESA. |
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| Temporal Coverage: | |
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| Start Date | 2012-01-11 |
| End Date | 2021-01-23 |
| Spatial Coverage: | |
| Latitude | |
| Southernmost | -75.48 |
| Northernmost | -75.48 |
| Longitude | |
| Westernmost | -107.09 |
| Easternmost | -107.09 |
| 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 | 30 meters - < 100 meters |
| Vertical Resolution | N/A |
| Vertical Resolution Range | N/A |
| Temporal Resolution | N/A |
| Temporal Resolution Range | N/A |
| Location: | |
| Location | Antarctica |
| Detailed Location | Along the western flank of the fast-flowing core of Thwaites Glacier. |
| Sensor(s): |
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| Source(s): |
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| Data Collection: | Feature tracking was carried out using Gamma Remote Sensing software 20190603. |
| Distribution: | |
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| Distribution Media | Online Internet (HTTP) |
| Distribution Size | 9.3 kB |
| Distribution Format | ASCII |
| Fees | N/A |
| Data Storage: | The dataset comprises one tabular text file of point data at (107.09 W, 75.48 S). TerraSAR_X speeds were measured at a resolution of 40 m. Sentinel-1 speeds were measured at a resolution of 100 m. |