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AGASEA 4.7 ka Englacial Isochron over the Thwaites Glacier Catchment Data DOI: https://doi.org/10.15784/601673 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: https://doi.org/10.15784/601673. AMD - DIF Record(s) young_1043761 NSIDC-0334_1 NSIDC-0334_1 Abstract 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 https://doi.org/10.15781/T23B5WS0D 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. Creator(s): Muldoon, Gail R.; Young, Duncan A.; Jackson, Charles; Blankenship, Donald D. Date Created: 2023-03-15 Repository: USAP-DC (current) License: Creative Commons Attribution Only v4.0 Generic [CC BY 4.0] Spatial Extent(s) West: -136, East: -95, South: -81, North: -74 Temporal Extent(s) Start: 2004-12-11 - End: 2005-01-30 Award(s) NSF 0230197 NSF 0636724 NSF 1043761 NSF 2127606 Version: 1 Related Project(s) Geophysical Investigations of Marie Byrd Land Lithospheric Evolution (GIMBLE) Airborne Geophysical Survey of the Amundsen Sea Embayment, Antarctica (AGASEA) Collaborative Research: Synthesis of Thwaites Glacier Dynamics: Diagnostic and Prognostic Sensitivity Studies of a West Antarctic Outlet System References 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) 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) 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) 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) Keywords Antarchitecture Antarctica Ice Penetrating Radar Isochron Layers Radar Radioglaciology Thwaites Glacier