During the 2010/2011 Antarctic field season a collaborative NERC AFI (Antarctic Funding Initiative) project studying the basal boundary conditions of the Institute & Moller ice streams, West Antarctica, collected ~25,000 km of new high quality aeromagnetic data. Data were acquired using scintrex cesium magnetometers mounted on the BAS aerogeophysical equiped Twin Otter.
Data are provided as XYZ ASCII line data.
Data were collected as part of the UK Natural Environment Research Council AFI grant NE/G013071/1.
Aerogeophysical, Aeromagnetics, Antarctic
|ISO Topic Categories:||
|Reference:||Jordan, T.A., Ferraccioli, F., Ross, N., Corr, H.F.J., Leat, P.T., Bingham, R.C., Rippin, D.M., Le Brocq, A & Siegert, M.J. 2010. Inland extent of the Weddell Sea Rift imaged by new aerogeophysical data. Tectonophysics, 585, 137-160.
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.
Ross, N., Bingham, R.G., Corr, H.F.J., Ferraccioli, F., Jordan, T.A., Le Brocq, A., Rippin, D.M., Young, D., Blankenship, D.D & Siegert, M. 2010. Steep reverse bed slope at the grounding line of the Weddell Sea sector in West Antarctica. Nature Geoscience, 5, 393-396. DOI: 10.1038/NGEO1468
Ross, N., Jordan, T.A., Bingham, R.G., Corr, H.F.J., Ferraccioli, F., Le Brocq, A., Rippin, D.M., Wright, A.P. & Siegert, M.J. 2012. The Ellsworth Subglacial Highlands: Inception and retreat of the West Antarctic Ice Sheet. Geological society of America Bulletin, doi:10.1130/B30794.1
Ferraccioli, F., Gambetta, M. & Bozzo, E., 1998. Microlevelling procedures applied to regional aeromagnetic data: an example from the Transantarctic Mountains (Antarctica), Geophysical Prospecting, 46, 177-196, https://doi.org/10.1046/j.1365-2478.1998.00080.x.
Jordan, T.A., Ferraccioli, F., Ross, N., Corr, H.F.J., Leat, P.T., Bingham, R.G., Rippin, D.M., Le Brocq, A. & Siegert, M.J. 2013. Inland extent of the Weddell Sea Rift imaged by new aerogeophysical data, Tectonophysics, 585, 137-160. http://dx.doi.org/10.1016/j.tecto.2012.09.010
Pilkington, M. & Thurston, B.J. 2001. Draping corrections for aeromagnetic data: Line versus grid-based approaches, Explor. Geophysics, doi:10.1071/eg01095
|Lineage:||IMAFI aeromagnetic data and details of survey design and location are presented in (Jordan et al., 2012). The dataset available here includes all channels from raw through to levelled, and draped products. Channel naming follows SCAR/ADMAP2 data release protocols. Key data processing steps are described below.
Magnetic data channels and processing flow:
MagR- Raw magnetic total field intensity data (nT).
MagC- Compensated, or low pass filtered magnetic data (nT). Adjustments to compensate for aircraft roll, pitch and yaw were applied.
RefField- Geomagnetic reference field value for which the magnetic data has been compensated. IGRF model 2010 as implemented in Geosoft (nT).
MagRTC- Compensated magnetic value adjusted for Tip tanks (where used) and geomagnetic reference field values. MagRTC= MagR- RefField (nT).
BCorr- Low pass filtered (60 minute) magnetic base station correction.
MagBRTC- calculated as MagBRTC= MagRTC- Bcorr (nT).
ACorr- Additional low pass filtering (30 fiducial cutoff) to account for any remnant noise in lines.
MagF- Final mag value before levelling. (nT)
MagL- Statistically levelled mag data. (nT)
MagL_Drape Microlevelled data draped to a uniform level of 2100m above the bed topography, using the method of (Pilkington and Thurston, 2001). (nT)
MagML- Microlevelled magnetic data following technique of (Ferraccioli et al., 1998). Note tie lines are not included in the microlevelled data channel. (nT)
Line_no Line Number
Flight ID Sequential flight number
x x projected meters *
y y projected meters *
Lon Longitude WGS 1984,
Lat Latitude WGS 1984,
Height_WGS1984 Aircraft altitude (meters) in WGS 1984,
Date Date of flight in time format e.g. 2006/01/08
Time Time (UTC) of flight e.g. 23:52:42.0
* Projected coordinates (x and y) are in Lambert conic conformal with two standard parallels defined as follows:
Latitude of false origin: -82
Longitude of false origin: -14
Latitude of 1st standard parallel -84
Latitude of 2nd standard parallel -80
False easting 2000000
False northing 2000000
|Data Set Creator||Ferraccioli, Fausto;Jordan, Tom;Ross, Neil;Corr, Hugh;Leat, Philip;Bingham, Rob;Rippin, David;Le Brocq, Anne;Siegert, Martin|
|Data Set Title||Processed line aeromagnetic data over the Institute and Moller region (2010/11 season)|
|Data Set Release Date||2020|
|Data Set Publisher||Polar Data Centre,Natural Environment Research Council,UK Research & Innovation|
|Other Citation Details||shortdoi:10/dn8h|
|Horizontal Resolution Range||30 meters - < 100 meters|
|Vertical Resolution Range||N/A|
|Temporal Resolution Range||N/A|
|Detailed Location||The Institute and Moller Glacier|
|Distribution Media||Online Internet (HTTP)|
|Distribution Size||95 MB|
|Data Storage:||This dataset constains 1 ASCII XYZ file:
- AFI_I&M_mag.XYZ ~95MB
|Use 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 the data in any publication as follows:
Ferraccioli, F., Jordan, T., Ross, N., Corr, H., Leat, P., Bingham, R., Rippin, D., Le Brocq, A., & Siegert, M. (2020). Processed line aeromagnetic data over the Institute and Moller region (2010/11 season) [Data set]. UK Polar Data Centre, Natural Environment Research Council, UK Research & Innovation. https://doi.org/10.5285/03C3180B-97EF-4923-86E1-7AC9EAB99497
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.