Airborne radar bed elevation picks across the Wilkes Subglacial Basin, 2005-2006
GB/NERC/BAS/PDC/01075
Abstract:
This data set contains bed and surface elevation picks derived from airborne radar collected during the WISE/ISODYN project. This collaborative UK/Italian project collected ~ 61000 line km of new aerogeophysical data during the 2005/2006 austral summer, over the previously poorly surveyed Wilkes subglacial basin, Dome C, George V Land and Northern Victoria Land.
Citation:
Ferraccioli, F., Corr, H., Jordan, T., Robinson, C., Armadillo, E., & Armadillo, G. (2018). Airborne radar bed elevation picks across the Wilkes Subglacial Basin, 2005-2006 (Version None) [Data set]. Polar Data Centre, Natural Environment Research Council, UK. https://doi.org/10.5285/59e5a6f5-e67d-4a05-99af-30f656569401
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License
| Access: | No restrictions apply. |
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| Use: | This data is covered by a UK Open Government Licence (http://www.nationalarchives.gov.uk/doc/open-government-licence/version/3/). Further by downloading this data the user acknowledges that they agree with the NERC data policy (http://www.nerc.ac.uk/research/sites/data/policy.asp), and the following conditions: 1. To cite the data in any publication as follows: DATA REFERENCE Ferraccioli F., Corr H, Jordan T.A., Robinson, C., Armadillo E., Bozzo E. & Caneva G. "Airborne radar bed elevation picks across the Wilkes Subglacial Basin, 2005-2006" (2018) Polar Data Centre, Natural Environment Research Council, UK https://doi.org/10.5285/59e5a6f5-e67d-4a05-99af-30f656569401 LITERATURE REFERENCE In prep. 2. The user recognizes the limitations of data. Use of the data is at the users' own risk, and there is no warranty as to the quality or accuracy of any data, or the fitness of the data for your intended use. The data are not necessarily fully quality assured and cannot be expected to be free from measurement uncertainty, systematic biases, or errors of interpretation or analysis, and may include inaccuracies in error margins quoted with the data. |
Basic Information
| Creation Date: | 2018-04-03 |
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| Dataset Progress: | Complete |
| Dataset Language: | English |
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Additional Information
| Reference: | Corr, H., Ferraccioli, F., Frearson, N., Jordan, T.A., Robinson, C., Armadillo, A., Caneva, G., Bozzo, E. & Tabacco, I.E., 2007. Airborne Radio-Echo Sounding of the Wilkes Subglacial Basin, the Transantarctic Mountains, and the Dome C Region. in The Italian-British Antarctic Geophysical and Geological Survey in Northern Victoria Land 2005-06-Towards the International Polar Year 2007-08., pp. 55-63, eds. Bozzo, E. & Ferraccioli, F. Terra Antartica Reports. Fretwell, P.; Pritchard, H.D.; Vaughan, D.G.; Bamber, J.L.; Barrand, N.E.; Bell, R.; Bianchi, C.; Bingham, R. G.; Blankenship, D.D.; Casassa, G.; Catania, G.; Callens, D.; Conway, H.; Cook, A.J.; Corr, H.F.J.; Damaske, D.; Damm, V.; Ferraccioli, F.; Forsberg, R.; Fujita, S.; Gim, Y.; Gogineni, P.; Griggs, J.A.; Hindmarsh, R.C.A.; Holmlund, P.; Holt, J.W.; Jacobel, R.W.; Jenkins, A.; Jokat, W.; Jordan, T.; King, E.C.; Kohler, J.; Krabill, W.; Riger-Kusk, M.; Langley, K.A.; Leitchenkov, G.; Leuschen, C.; Luyendyk, B.P.; Matsuoka, K.; Mouginot, J.; Nitsche, F.O.; Nogi, Y.; Nost, O.A.; Popov, S.V.; Rignot, E.; Rippin, D.M.; Rivera, A.; Roberts, J.; Ross, N.; Siegert, M.J.; Smith, A.M.; Steinhage, D.; Studinger, M.; Sun, B.; Tinto, B.K.; Welch, B.C.; Wilson, D.; Young, D.A.; Xiangbin, C.; Zirizzotti, A.. 2013 Bedmap2: improved ice bed, surface and thickness datasets for Antarctica. The Cryosphere, 7 (1). 375-393, doi:10.5194/tc-7-375-2013 Fremand, A. C., Bodart, J. A., Jordan, T. A., Ferraccioli, F., Robinson, C., Corr, H. F. J., Peat, H. J., Bingham, R. G., and Vaughan, D. G.: British Antarctic Survey's aerogeophysical data: releasing 25 years of airborne gravity, magnetic, and radar datasets over Antarctica, Earth Syst. Sci. Data, 14, 3379-3410, https://doi.org/10.5194/essd-14-3379-2022, 2022. |
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| Quality: | The standard deviation of the bed elevation for all crossover errors for the radar data is 33.3 m. However, this value is skewed by a few high error points in regions of more extreme topography. Over areas with smoother topography the standard deviation of the crossovers is ~10 m. Resolution: The line spacing for the main survey area is 8.8km, with tie lines 44 km apart. Additional regional lines explore specific targets. The along track sample spacing is 20 m. |
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| Lineage/Methodology: | Radar data were collected using the PASIN radar echo sounding system (table 1 (Corr et al., 2007)). Data provided here includes picks and derived elevations of the ice sheet surface and bed. Bed reflections were picked from the radargram after unfocused synthetic aperture (SAR) processing. The bed reflector was picked in a semi-automated manner within the seismic processing package ProMax. An automatic first break picker was applied initially, with subsequent manual editing/removal of picks which appear unreasonable. The final sample spacing of the picked data is ~20 m. The surface elevation is derived from radar altimeter for ground clearance < 750 m, and the PASIN system for higher altitudes. The absolute position and altitude of the aircraft is derived from differentially processed GPS data. The final bedrock channel was created from the picked bed elevation, and surface elevation where flights crossed rock outcrops, as defined in the Antarctic Digital Database (http://www.add.scar.org/) Version 6, downloaded February 2014. A bedrock elevation channel including BEDMAP2 data (Fretwell et al., 2013), where there is no other information about ice sheet bed elevation, is also included. | |
| Ownership: | This data was collected as part of the joint UK-Italian ISODYN/WISE project in East Antarctica. In addition we thank the BAS air unit and all the staff at Mario Zucchelli Station, Talos Dome and Dome C from where the survey operated. | |
Extent
| Temporal Coverage: | |
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| Start Date | 2005-11-09 |
| End Date | 2006-01-27 |
| Spatial Coverage: | |
| Latitude | |
| Southernmost | -76.79 |
| Northernmost | -68.98 |
| Longitude | |
| Westernmost | 117.65 |
| Easternmost | 172.15 |
| Altitude | |
| Min Altitude | N/A |
| Max Altitude | N/A |
| Depth | |
| Min Depth | N/A |
| Max Depth | N/A |
| Location: | |
| Location | Antarctica |
| Detailed Location | Wilkes Subglacial Basin, East Antarctica |
Instrumentation
| Data Collection: | Data was collected using the BAS aerogeophysicaly equipped twin otter VP-FBL. With radar data collected using the PASIN radar echo sounding system. GPS data were recorded with Leica receivers on the aircraft and as a base station. |
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Storage
| Data Storage: | Data is provided in one of two formats: Geosoft database (.gdb) with associated .dbview file, or ASCII file format (.xyz). The radar data set includes the following channels: (1) "Date" - UTC date (YYYY/MM/DD) (2) "Time" - UTC time (HH:MM:SS.SS) (3) "FlightID" - Sequential flight number and survey ID e.g. W12 (4) "Line_name" - Line Number e.g. LW200.1 (5) "Lon" - Longitude (decimal degrees, WGS84, EPSG: 4326) (6) "Lat" - Latitude (decimal degrees, WGS84, EPSG: 4326) (7) "x" - easting (meters, Weddell Lambert Conformal Conic Projection) (8) "y" - northing (meters, Weddell Lambert Conformal Conic Projection) (9) "Height_WGS1984" - Aircraft altitude (meters) in WGS 1984 (10) "segy_name" - Radar_segy file name (11) "TraceNum" - Radar segy trace number (12) "PriNum" - Raw radar time (13) "surfPickLoc" - Location down trace of surface pick (14) "bedPickLoc" - Location down trace of bed elevation pick (15) "surfElev" - Surface elevation (meters) in WGS 1984 ellipsoid (16) "Picked_bedElev" - Picked bed elevation (meters) in WGS 1984 ellipsoid, derived by subtracting tice from surfElev (17) "tIce" - Ice thickness (meters), derived from bedPickLoc and surfPickLoc. (18) "Bedrock" - Rock elevation (meters), from Picked_bedElev, or surfElev where there is rock outcrop. (19) "Mask" - Flags regions with no Bedrock data within 2 km. (20) "Bedrock_and_BEDMAP2" - Rock elevation (meters) from our data, padded with BEDMAP2, used to create gridded bed elevation. Weddell Lambert Conformal Conic Projection defined as: False origin; Latitude -74.018118, Longitude 179; Latitude of 1st Standard parallel: -72.6667; Latitude of 2nd Standard parallel: -75.3333; False easting and northing: 1444000, 1123000. |
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