USAP-DC

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ANTAEM project airborne EM resistivity data from McMurdo Region Data DOI: https://doi.org/10.15784/601373 Cite as Tulaczyk, S. (2020) "ANTAEM project airborne EM resistivity data from McMurdo Region" U.S. Antarctic Program (USAP) Data Center. doi: https://doi.org/10.15784/601373. AMD - DIF Record(s) USAP-1644187_1 Abstract The ANTAEM survey was carried out in the period November 12th to 28th, 2018, with the SkyTEM 312 system. Twenty-one missions (flights) were conducted over 11 production days of helicopter service, resulting in a total of approximately ~3400 line km of data. The SkyTEM system records data from take-off until landing resulting in multiple lines converging to the landing pads in McMurdo and at Marble Point. The production without overlapping lines adds up to approximately 2900 line km. The flight speed was approximately 120 km/h at a target flight altitude of ~50 m (sensor height), but the actual sensor height varies depending on the terrain. The surveys were carried out with a Bell 212 helicopter, which carried the SkyTEM sensor as a sling load. The SkyTEM system was configured in a standard two-moment setup (low moment, LM and high moment, HM). Areas with extremely resistive dry and/or frozen sediment/bedrock, and glacier ice often produce EM-signals with amplitudes below the detection level of the system. Data from these low signal environments cannot be inverted into resistivity models. Data with strong induced polarization effects cannot be inverted for resistivity either. These data were discharged in this standard data delivery. The EM-data and inversion result (resistivity models) are delivered in the SkyTEM2018_dat.xyz and SkyTEM2018_inv.xyz files respectably. The RECORD number in the two files links data and model together. EM-data and data uncertainty for data entering inversion. Info stated in file Header: NAN value, Data unit, Coordinate system, Gate times. The SkyTEM system uses at High-Low moment data recording cycle, therefore only a subset of the total 40 time gates are preset for each moment. The standard lateral constraints inversion (LCI), delivered in the SkyTEM2018_inv.xyz file, was carried out with a smooth 30 layered resistivity model discretized to a depth of 500 m. A depth of investigation (DOI) was estimated for each resistivity model. Creator(s): Tulaczyk, Slawek Date Created: 2020-09-12 Repository: USAP-DC (current) License: Creative Commons Attribution-NonCommercial v4.0 Generic [CC BY-NC 4.0] Spatial Extent(s) West: 161, East: 168.5, South: -78.3, North: -76.9 Temporal Extent(s) Start: 2018-11-02 - End: 2018-11-28 Award(s) NSF 1644187 Version: 1 Related Project(s) Collaborative Research: Antarctic Airborne ElectroMagnetics (ANTAEM) - Revealing Subsurface Water in Coastal Antarctica References Tulaczyk, S. M., & Foley, N. T. (2020). The role of electrical conductivity in radarwave reflection. The Cryosphere Discussion. (doi:10.5194/tc-2020-9) Foley, N., Tulaczyk, S.M., Grombacher, D., Doran, P.T., Mikucki, J., Myers, K.F., Foged, N., Dugan, H., Auken, E. and Virginia, R., 2019. Evidence for pathways of concentrated submarine groundwater discharge in east Antarctica from helicopter-borne electrical resistivity measurements. Hydrology, 6(2), p.54. (doi:10.3390/HYDROLOGY6020054) Keywords Antarctica Dry Valleys Hydrology Ice Shelf Mcmurdo Permafrost