Dataset Information
AGASEA 4.7 ka Englacial Isochron over the Thwaites Glacier Catchment
Data DOI:
Cite as
Muldoon, G., Blankenship, D. D., Jackson, C., & Young, D. A. (2023) "AGASEA 4.7 ka Englacial Isochron over the Thwaites Glacier Catchment" U.S. Antarctic Program (USAP) Data Center. doi:
AMD - DIF Record(s)
This file contains internal radar horizon 1 (lm-MERGE-lay9-grg) for West Antarctica, collected during the SOAR/CASERTZ (1991-1996), SOAR/DVD (1999), ATRS (2001), AGASEA (2004-05) and GIMBLE (2013-2014) expeditions. Only data collected in AGASEA is contained in this specific product. This data set is linked to PH.D thesis Muldoon, G. 2018 "West Antarctic Ice Sheet Retreat during the Last Interglacial"Spatial and temporal distributions of accumulation rates on the catchment of Thwaites Glacier, West Antarctica", University of Texas at Austin The internal radar horizon (IRH) was traced semi-automatically by Gail R. Muldoon using Haliburtons's Landmark software and picker, in a combination of 2D focused and unfocused data. Depths were calculated using a 2 way velocity in ice of 84.5 m/microsecond, and no firn correction. Isochron age is 4711 (+/- 246 ) years. Funding for this dataset as provided by NSF grants and The G. Unger Vetlesen Foundation.
Muldoon, Gail R.; Young, Duncan A.; Jackson, Charles; Blankenship, Donald D.
Date Created:
USAP-DC (current)
Spatial Extent(s)
West: -136, East: -95, South: -81, North: -74
Temporal Extent(s)
Start: 2004-12-11 - End: 2005-01-30
  1. Holt, J. W., D. D. Blankenship, D. L. Morse, D. A. Young, M. E. Peters, S. D. Kempf, T. G. Richter, D. G. Vaughan, H. F. J. Corr. 2006. New boundary conditions for the West Antarctic Ice Sheet; subglacial topography of the Thwaites and Smith Glacier catchments. Geophysical Research Letters L09502, doi: 10.1029/2005GL025561 (doi:10.1029/2005GL025561)
  2. Peters, M. E., D. D. Blankenship, S. P. Carter, D. A. Young, S. D. Kempf, and J. W. Holt. 2007. Along-Track Focusing of Airborne Radar Sounding Data from West Antarctica for Improving Basal Reflection Analysis and Layer Detection, IEEE Transactions on Geoscience and Remote Sensing, 45(9), 2725-2736. (doi:10.1109/TGRS.2007.897416)
  3. Muldoon, G. R., Jackson, C. S., Young, D. A., and Blankenship, D. D.,2018, Bayesian estimation of englacial radar chronology in Central West Antarctica, Dynamics And Statistics Of The Climate System, 3, 1, dzy004 (doi:10.1093/climatesystem/dzy004)
  4. Bodart, J. A., Bingham, R. G., Young, D. A., MacGregor, J. A., Ashmore, D. W., Quartini, E., Hein, A. S., Vaughan, D. G., and Blankenship, D. D., in review, High mid-Holocene accumulation rates over West Antarctica inferred from a pervasive ice-penetrating radar reflector, The Cryosphere Discussions, 2022, 1--22, (doi:10.5194/tc-2022-199)
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MD5 Checksum: 3d3968d07149521bfe2767094e4972d3 File Type: Portable Network Graphics; Binary File; Comma-Separated Values (CSV)

This dataset has been downloaded 7 times since March 2017 (based on unique date-IP combinations)