none 10.1144/SP461.14 Geological Society of London Geological Society of London 1881 92331259 65091 2024072316111700200 10.1144 2024-07-23T23:35:33Z 2017-08-11T20:20:15Z 17 Geological Society, London, Special Publications SP 0305-8719 2041-4927 01 09 2018 01 2018 461 1 L. H. Beem University of Texas Institute for Geophysics, 10100 Burnet Road, Austin, TX 78758, USA M. G. P. Cavitte University of Texas Institute for Geophysics, 10100 Burnet Road, Austin, TX 78758, USA D. D. Blankenship University of Texas Institute for Geophysics, 10100 Burnet Road, Austin, TX 78758, USA S. P. Carter Institute of Geophysics and Oceanography, Scripps Institution of Oceanography, University of California San Diego, La Jolla, CA 92093, USA D. A. Young University of Texas Institute for Geophysics, 10100 Burnet Road, Austin, TX 78758, USA G. R. Muldoon University of Texas Institute for Geophysics, 10100 Burnet Road, Austin, TX 78758, USA C. S. Jackson University of Texas Institute for Geophysics, 10100 Burnet Road, Austin, TX 78758, USA M. J. Siegert Grantham Institute and Department of Earth Sciences and Engineering, Imperial College London, South Kensington, London SW7 2AZ, UK Abstract Near the South Pole, a large subglacial lake exists beneath the East Antarctic Ice Sheet less than 10 km from where the bed temperature is inferred to be −9°C. A thermodynamic model was used to investigate the apparent contradiction of basal water existing in the vicinity of a cold bed. Model results indicate that South Pole Lake is freezing and that neither present-day geothermal flux nor ice flow is capable of producing the necessary heat to sustain basal water at this location. We hypothesize that the lake comprises relict water formed during a different configuration of ice dynamics when significant frictional heating from ice sliding was available. Additional modelling of assumed basal sliding shows frictional heating was capable of producing the necessary heat to fill South Pole Lake. Independent evidence of englacial structures measured by airborne radar revel ice-sheet flow was more dynamic in the past. Ice sliding is estimated to have ceased between 16.8 and 10.7 ka based on an ice chronology from a nearby borehole. These findings reveal major post-Last Glacial Maximum ice-dynamic change within the interior of East Antarctica, demonstrating that the present interior ice flow is different than that under full glacial conditions. 08 11 2017 01 2018 35 47 10.1144/SP461.14 1 10.1144/crossmark-policy www.lyellcollection.org true 2017-08-11 https://doi.org/10.15223/policy-002 10.1144/SP461.14 https://www.lyellcollection.org/doi/10.1144/SP461.14 https://www.lyellcollection.org/doi/pdf/10.1144/SP461.14 https://pubs.geoscienceworld.org/books/book/2098/chapter/114467863/iceflow-reorganization-within-the-east-antarctic https://pubs.geoscienceworld.org/UrlRedirectHandler.ashx?routename=books&chapterdoi=10.1144/SP461.14&request=chapter 10.3189/2013JoG13J068 AartsenM.G. AckermannM. 2014. IceCube-Gen2: a vision for the future of neutrino astronomy in Antarctica Preprint at http://arxiv.org/abs/1412.5106 10.1029/2004JD005667 10.1029/2006JF000556 10.1002/2014JF003291 10.1029/2006GC001408 10.3189/2014AoG68A016 The Physics of Glaciers Cuffey K.M. 2010 CuffeyK.M. & PatersonW.S.B. 2010. The Physics of Glaciers. Butterworth-Heinemann, Burlington, MA. 10.3189/S0022143000031208 10.3189/172756500781832693 10.5194/cp-9-2489-2013 10.1126/science.1106888 10.5194/tc-7-375-2013 10.1002/joc.4362 USNC-IGY Antarctic Glaciological Data. Report number 2: Field work 1958, Part IV, South Pole Station Giovinetto M.B. 1960 GiovinettoM.B. 1960. USNC-IGY Antarctic Glaciological Data. Report number 2: Field work 1958, Part IV, South Pole Station. Ohio State University Research Foundation, Columbus, OH. 10.5194/esurf-3-239-2015 10.1089/153110703322610672 10.3189/S0022143000016427 10.3189/172756500781833485 10.3189/172756499781820969 10.1002/2016GL070278 Journal of Geophysical Research Leysinger Vieli J.M.C. F02018 2011 Time-dependence of the spatial pattern of accumulation rate in East Antarctica deduced from isochronic radar layers using a 3D numerical ice-flow model Leysinger VieliJ.M.C., HindmarshR.C.A., SiegertM.J. & SunB. 2011. Time-dependence of the spatial pattern of accumulation rate in East Antarctica deduced from isochronic radar layers using a 3D numerical ice-flow model. Journal of Geophysical Research, F02018, https://doi.org/10.1029/2010JF001785 10.1002/2014JF003215 10.1126/science.1167350 10.1029/1998JD200092 10.1130/G20317.1 10.3189/S0022143000028367 10.1111/j.1365-246X.1978.tb05931.x 10.1029/2008GL035704 10.1073/pnas.082238999 10.3189/S0022143000016440 10.1130/B30794.1 Firn Air Isotope and Temperature Measurements from Siple Dome and South Pole, Version 1 Severinghaus J.P. 2001 SeveringhausJ.P., GrachevA. & BattleM. 2001. Firn Air Isotope and Temperature Measurements from Siple Dome and South Pole, Version 1. National Snow and Ice Data Center (NSIDC), Boulder, CO, https://doi.org/10.7265/N51N7Z2P 10.1016/j.epsl.2004.04.011 10.3189/S002214300002219X 10.3189/S0022143000003488 10.1126/science.1101072 10.1017/S0954102005002889 10.1016/j.quascirev.2013.08.003 10.1029/96WR03137 10.1029/2011JF002126 10.1029/1999JD900501 10.1201/b14059 10.5194/cp-9-2335-2013 10.3189/002214307784409351 10.1017/S095410201200048X