NSF COLDEX 2022-23 Level 2 Basal Specularity Content Profiles

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Young, Duncan; Kerr, Megan E.; Singh, Shivangini; Yan, Shuai; Kempf, Scott D; Buhl, Dillon P; Ng, Gregory; Blankenship, Donald D., 2025, "NSF COLDEX 2022-23 Level 2 Basal Specularity Content Profiles", https://doi.org/10.18738/T8/6T5JS6, Texas Data Repository, V1

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Description	Introduction The National Science Foundations Center for Oldest Ice Exploration (NSF COLDEX) is a Science and Technology Center working to extend the record of atmospheric gases, temperature and ice sheet history to greater than 1 million years. As part of this effort, NSF COLDEX has been searching for a site for a continuous ice core extending through the mid-Pleistocene transition. Two seasons of airborne survey were conducted from South Pole Station across the southern flank of Dome A. 2022-2023 Field Season In the 2022-20223 field season (CXA1), and using a BT-67 Basler, NSF COLDEX conducted 13 full flights and one weather abort from South Pole Station toward the southern flank of Dome C; as well as 1 survey flight toward Hercules Dome in support of the Hercules Dome Drilling project. Three test flights were conducted from McMurdo Station. Instrumentation included the 60 MHz MARFA ice penetrating radar from the University of Texas Institute for Geophysics, a UHF ice penetrating radar from the Center for Remote Sensing and Integrated Systems; an GT-2 Gravimeter, and LD-90 laser altimeter and an G-823 Magnetometer. Basal specularity content These basal specularity content were derived from comparing 1D and 2D focused MARFA data (Peters et al., 2007). By comparing bed echo strengths for different focusing apertures, and accounting for the ranges and angles involved, we can derive the "specularity content" of the bed echo, a proxy for small scale bed roughness and a good indicator for subglacial water pressure in regions of distributed subglacial water (Schroeder et al., 2014, IEEE GRSL , Dow et al., 2019, EPSL ) and smooth deforming bed material (Schroeder et al., 2014, GRL, Young et al., 2016, PTRS. Specularity data are inherently noisy, so these products have been smoothed with a 1 km filter.
Subject	Earth and Environmental Sciences
Keyword	ice penetrating radar, radioglaciology, Antarctica
Related Publication	Young, D. A., Schroeder, D. M., Blankenship, D. D., Kempf, S. D., and Quartini, E.,The distribution of basal water between Antarctic subglacial lakes from radar sounding,2016,Philosophical Transactions of the Royal Society A,374(20140297), pp.1-21,https://doi.org/10.1098/rsta.2014.0297doi: 10.1098/rsta.2014.0297
License/Data Use Agreement	CC0 1.0

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Citation Metadata

Persistent Identifier	doi:10.18738/T8/6T5JS6
Publication Date	2025-03-02
Title	NSF COLDEX 2022-23 Level 2 Basal Specularity Content Profiles
Alternative URL	https://www.coldex.org
Author	University of Texas at Austin, Jackson School of Geosciences, Univeristy of Texas institute for Geophysicshttps://orcid.org/0000-0002-6866-8176 University of Texas at Austin, Jackson School of Geosciences, Univeristy of Texas institute for Geophysics and Department of Earth and Planetary Sciences0009-0004-8273-5410 University of Texas at Austin, Jackson School of Geosciences, Univeristy of Texas institute for Geophysics and Department of Earth and Planetary Sciences0000-0003-4040-5662 University of Washington0000-0002-8579-6866 Kempf, Scott DUniversity of Texas at Austin, Jackson School of Geosciences, Univeristy of Texas institute for Geophysics Buhl, Dillon PUniversity of Texas at Austin, Jackson School of Geosciences, Univeristy of Texas institute for Geophysics Ng, GregoryUniversity of Texas at Austin, Jackson School of Geosciences, Univeristy of Texas institute for Geophysics University of Texas at Austin, Jackson School of Geosciences, Univeristy of Texas institute for Geophysics0000-0003-0205-4830
Point of Contact	Use email button above to contact. Young, Duncan (University of Texas at Austin)
Description	Introduction The National Science Foundations Center for Oldest Ice Exploration (NSF COLDEX) is a Science and Technology Center working to extend the record of atmospheric gases, temperature and ice sheet history to greater than 1 million years. As part of this effort, NSF COLDEX has been searching for a site for a continuous ice core extending through the mid-Pleistocene transition. Two seasons of airborne survey were conducted from South Pole Station across the southern flank of Dome A. 2022-2023 Field Season In the 2022-20223 field season (CXA1), and using a BT-67 Basler, NSF COLDEX conducted 13 full flights and one weather abort from South Pole Station toward the southern flank of Dome C; as well as 1 survey flight toward Hercules Dome in support of the Hercules Dome Drilling project. Three test flights were conducted from McMurdo Station. Instrumentation included the 60 MHz MARFA ice penetrating radar from the University of Texas Institute for Geophysics, a UHF ice penetrating radar from the Center for Remote Sensing and Integrated Systems; an GT-2 Gravimeter, and LD-90 laser altimeter and an G-823 Magnetometer. Basal specularity content These basal specularity content were derived from comparing 1D and 2D focused MARFA data (Peters et al., 2007). By comparing bed echo strengths for different focusing apertures, and accounting for the ranges and angles involved, we can derive the "specularity content" of the bed echo, a proxy for small scale bed roughness and a good indicator for subglacial water pressure in regions of distributed subglacial water (Schroeder et al., 2014, IEEE GRSL , Dow et al., 2019, EPSL ) and smooth deforming bed material (Schroeder et al., 2014, GRL, Young et al., 2016, PTRS. Specularity data are inherently noisy, so these products have been smoothed with a 1 km filter.
Subject	Earth and Environmental Sciences
Keyword	ice penetrating radar radioglaciology Antarctica
Related Publication	Young, D. A., Schroeder, D. M., Blankenship, D. D., Kempf, S. D., and Quartini, E.,The distribution of basal water between Antarctic subglacial lakes from radar sounding,2016,Philosophical Transactions of the Royal Society A,374(20140297), pp.1-21,https://doi.org/10.1098/rsta.2014.0297 doi 10.1098/rsta.2014.0297 https://doi.org/10.1098/rsta.2014.0297 Schroeder, D. M., Blankenship, D. D., Raney, R. K., and Grima, C.,Estimating subglacial water geometry using radar bed echo specularity: application to Thwaites Glacier, West Antarctica, 2015, IEEE Geoscience and Remote Sensing Letters,12(3), pp.443-447, http://dx.doi.org/10.1109/LGRS.2014.2337878 doi 10.1109/LGRS.2014.2337878 http://dx.doi.org/10.1109/LGRS.2014.2337878
Production Date	2022-12-31
Production Location	Antarctica
Funding Information	National Science Foundation: 2019719 G. Unger Vetlesen Foundation: Antarctic aerogeophysics gift National Science Foundation: 2127606
Depositor	Young, Duncan
Deposit Date	2025-03-02
Date of Collection	Start Date: 2022-12-10 ; End Date: 2023-01-28
Data Type	machine readable text

Geospatial Metadata

Geographic Coverage	Antarctica
Geographic Bounding Box	-109 159.5 -76.5 -90

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