Abstract:
This dataset contains bed, surface elevation and ice thickness measurements from the Recovery/Slessor/Bailey Region, East Antarctica. Radar data was collected using the 150MHz PASIN radar echo sounding system (Corr et al., 2007) deployed on a British Antarctic Survey (BAS) Twin Otter during the ICEGRAV-2013 airborne geophysics campaign (Forsberg et al., 2018). Data is identified by flight and are available in both Geosoft database (.gdb) and ASCII file formats (.xyz).
Keywords:
East Antarctica, ICEGRAV, Ice Thickness, PASIN, Radio Echo Sounding (RES), Recovery/Slessor/Bailey Region
Ferraccioli, F., Corr, H., Jordan, T., Forsberg, R., Matsuoka, K., Diez, A., Olesen, A., Ghidella, M., Zakrajsek, A., Robinson, C., & King, O. (2018). Bed, surface elevation and ice thickness measurements derived from Radar acquired during the ICEGRAV-2013 airborne geophysics campaign (Version None) [Data set]. Polar Data Centre, Natural Environment Research Council, UK. https://doi.org/10.5285/6549203d-da8b-4a22-924b-a9e1471ea7f1
| Access Constraints: | 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 both the data and literature reference in any publication as follows: DATA REFERENCE Ferraccioli, F., Corr, H., Jordan, T.A., Forsberg, R., Matsuoka, K., Diez, A., Olesen, A.V., Ghidella, M., Zakrajsek, A., Robinson, C., King, O. 2018. Bed, surface elevation and ice thickness measurements derived from Radar acquired during the ICEGRAV-2013 airborne geophysics campaign. Polar Data Centre, British Antarctic Survey, NERC, Cambridge, UK. DOI: 10.5285/6549203d-da8b-4a22-924b-a9e1471ea7f1 LITERATURE REFERENCE Diez A., K. Matsuoka, F. Ferraccioli, T.A. Jordan, H.F.J. Corr, J. Kohler, A. Olesen, and R. Forsberg (2018), Basal settings control fast ice flow in the Recovery/Slessor/Bailey Region, East Antarctica, Geophys. Res. Lett., 45, doi:10.1002/2017GL076601 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. |
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| Creation Date: | 2018-01-26 |
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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 | Dr Fausto Ferraccioli |
| Role(s) | Investigator |
| Organisation | British Antarctic Survey |
| Name | Mr Hugh Corr |
| Role(s) | Investigator, Technical Contact |
| Organisation | British Antarctic Survey |
| Name | Dr Tom Jordan |
| Role(s) | Investigator, Technical Contact |
| Organisation | British Antarctic Survey |
| Name | Dr Kenichi Matsuoka |
| Role(s) | Investigator |
| Organisation | Norwegian Polar Institute |
| Name | Dr Anja Diez |
| Role(s) | Investigator |
| Organisation | Norwegian Polar Institute |
| Name | Dr Arne V Olesen |
| Role(s) | Technical Contact, Investigator |
| Organisation | Technical University of Denmark |
| Name | Dr René Forsberg |
| Role(s) | Investigator |
| Organisation | Technical University of Denmark |
| Name | Dr Marta Ghidella |
| Role(s) | Investigator |
| Organisation | Instituto Antártico Argentino |
| Name | Andrés Zakrajsek |
| Role(s) | Technical Contact |
| Organisation | Instituto Antártico Argentino |
| Name | Carl Robinson |
| Role(s) | Technical Contact |
| Organisation | British Antarctic Survey |
| Name | Owen King |
| Role(s) | Technical Contact |
| Organisation | British Antarctic Survey |
| Parent Dataset: | N/A |
| Reference: | Diez A., K. Matsuoka, F. Ferraccioli, T.A. Jordan, H.F.J. Corr, J. Kohler, A. Olesen, and R. Forsberg (2018) Basal settings control fast ice flow in the Recovery/Slessor/Bailey Region, East Antarctica. Geophys. Res. Lett., 45, doi:10.1002/2017GL076601 Forsberg, R., Olesen, A. V., Ferraccioli, F., Jordan, T. A., Matsuoka, K., Zakrajsek, A., Greenbaum, J. S. (2018) Exploring the Recovery Lakes region and interior Dronning Maud Land, East Antarctica, with airborne gravity, magnetic and radar measurements. Geological Society, London, Special Publications, 461(1), 23-34. DOI: 10.1144/SP461.17 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. |
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| Lineage: | For the processing of the data a coherent moving-average filter, commonly referred to as an unfocused SAR, was used. The bed reflector was first automatically picked using the PROMAX software package. All the picks were afterwards checked and corrected by hand if necessary. The picked travel time was then converted to depth using a radar wave speed of 168 m/µs and a constant firn correction of 10 m. Surface elevation measurements were derived from radar altimeter for ground clearance < 750 m, and the PASIN system for higher altitudes. The data was collected flying at an average flight velocity of 65 m/s. This resulted in approximately10 m alongtrack spacing of radar traces. The radar lines have a spacing of approximately 27 km. The majority of flights are at a constant elevation, required for coincident collection of gravity data. Channel description: Basic Channels Name Description Date UTC date (YYYY/MM/DD) Time UTC time (HH:MM:SS.SS) FlightID Sequential flight number and survey ID e.g. W12 Line_name Line Number e.g. LW200.1 Lon Longitude WGS 1984 Lat Latitude WGS 1984 x x projected meters * y y projected meters * Height_WGS1984 Aircraft altitude (meters) in WGS 1984 Radar segy_name Radar_segy file name TraceNum Radar segy trace number PriNum Raw radar time surfPickLoc Location down trace of surface pick bedPickLoc Location down trace of bed elevation pick surfElev Surface elevation (m) bedElev Ice bed elevation (m) tIce Ice thickness (m) * Projected coordinates (x and y) are in Weddell Lambert with two standard parallels defined as follows: Latitude of false origin: -80 Longitude of false origin: -81 Latitude of 1st standard parallel -82 Latitude of 2nd standard parallel -78 False easting 26501 False northing 1977093 |
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| Ownership: | The ICEGRAV Antarctic airborne survey was flown in 2013 and was sponsored by the US National Geospatial-Intelligence Agency, DTU Space (Denmark), and the Center of Ice, Climate and Ecosystems (ICE) of the Norwegian Polar Institute (NPI), with significant logistics and in-kind contributions by the British Antarctic Survey (BAS), NPI, and the Instituto Antártico Argentino. BAS flew the survey with its aerogeophysical survey platform, a Twin Otter. The Antarctic Logistics Center International (ALCI) prepared fuel at FD83 that was used for the NPI-led field camp at Recovery Lakes. We especially thank M. Ghidella and A. Zakrajsek (Instituto Antárctico Argentino) for their field campaign support. | |
| Temporal Coverage: | |
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| Start Date | 2013-01-04 |
| End Date | 2013-02-03 |
| Spatial Coverage: | |
| Latitude | |
| Southernmost | -84.24988 |
| Northernmost | -75.28099 |
| Longitude | |
| Westernmost | -34.52766 |
| Easternmost | 27.2173 |
| 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 | 10 km - < 50 km or approximately .09 degree - < .5 degree |
| Vertical Resolution | N/A |
| Vertical Resolution Range | N/A |
| Temporal Resolution | N/A |
| Temporal Resolution Range | N/A |
| Location: | |
| Location | Antarctica |
| Detailed Location | Recovery/Slessor/Bailey Region, East Antarctica |
| Data Collection: | Radar data was collected using the PASIN radar echo sounding system (Corr et al., 2007) using a British Antarctic Survey (BAS) Twin Otter. The radar has a centre frequency of 150 MHz. As signal a 4 microsecond chirp was used with a bandwidth of 10 MHz. The used sampling frequency was 22 MHz. |
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| Distribution: | |
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| Distribution Media | Various Online Data Transfer method |
| Distribution Size | 126 MB |
| Distribution Format | ASCII |
| Fees | N/A |
| Distribution Media | Various Online Data Transfer method |
| Distribution Size | 369 MB |
| Distribution Format | N/A |
| Fees | N/A |
| Data Storage: | Data is provided in one of two formats: Geosoft database (.gdb) with associated .dbview file, or ASCII file format (.xyz). The data contains 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 ellipsoid (10) "SegY_name" - Radar_segy file name (11) "TraceNum" - Radar segy trace number (12) "PriNum" - Raw radar counter (13) "surfPickLoc" - Location down trace of surface pick in number of samples (14) "bedPickLoc" - Location down trace of bed elevation pick in number of samples (15) "surfElev" - Surface elevation (meters) in WGS 1984 ellipsoid (16) "bedElev" - Ice bed elevation (meters) in WGS 1984 ellipsoid (17) "tIce" - Ice thickness (meters) Weddell Lambert Conformal Conic Projection defined as: False origin; Latitude -80, Longitude -81; Standard parallels: -82 and -78; False easting and northing: 26501, 1977093. |