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Ocean access beneath the southwest tributary of Pine Island Glacier, West Antarctica

  • Dustin M. Schroeder (a1) (a2), Andrew M. Hilger (a2), John D. Paden (a3), Duncan A. Young (a4) and Hugh F. J. Corr (a5)...
Abstract
ABSTRACT

The catchments of Pine Island Glacier and Thwaites Glacier in the Amundsen Sea Embayment are two of the largest, most rapidly changing, and potentially unstable sectors of the West Antarctic Ice Sheet. They are also neighboring outlets, separated by the topographically unconfined eastern shear margin of Thwaites Glacier and the southwest tributary of Pine Island Glacier. This tributary begins just downstream of the eastern shear margin and flows into the Pine Island ice shelf. As a result, it is a potential locus of interaction between the two glaciers and could result in cross-catchment feedback during the retreat of either. Here, we analyze relative basal reflectivity profiles from three radar sounding survey lines collected using the UTIG HiCARS radar system in 2004 and CReSIS MCoRDS radar system in 2012 and 2014 to investigate the extent and character of ocean access beneath the southwest tributary. These profiles provide evidence of ocean access ~12 km inland of the 1992–2011 InSAR-derived grounding line by 2014, suggesting either retreat since 2011 or the intrusion of ocean water kilometers inland of the grounding line.

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Copyright
This is an Open Access article, distributed under the terms of the Creative Commons Attribution licence (http://creativecommons.org/licenses/by/4.0/), which permits unrestricted re-use, distribution, and reproduction in any medium, provided the original work is properly cited.
References
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Alley RB and 7 others (2015) Oceanic forcing of ice-sheet retreat: West Antarctica and more. Annu. Rev. Earth Planet. Sci., 43(1), 207231
Bamber J and Rignot E (2002) Unsteady flow inferred for Thwaites Glacier, and comparison with Pine Island Glacier, West Antarctica. J. Glaciol., 48(161), 237246
Brisbourne AM and 8 others (2017) Bed conditions of Pine Island Glacier, West Antarctica. J. Geophys. Res.: Earth Surf., 122(1), 419433
Chen JL, Wilson CR, Blankenship D and Tapley BD (2009) Accelerated Antarctic ice loss from satellite gravity measurements. Nat. Geosci., 2(12), 859862
Chu W and 5 others (2016) Extensive winter subglacial water storage beneath the Greenland Ice Sheet. Geophys. Res. Lett., 43(24), 484492
Dutrieux P and 6 others (2013) Pine Island Glacier ice shelf melt distributed at kilometre scales. Cryosphere, 7(5), 15431555
Dutrieux P and 9 others (2014a) Strong sensitivity of Pine Island ice-shelf melting to climatic variability. Science, 343(6167), 174178
Dutrieux P and 6 others (2014b) Basal terraces on melting ice shelves. Geophys. Res. Lett., 41(15), 55065513
Favier L and 8 others (2014) Retreat of Pine Island Glacier controlled by marine ice-sheet instability. Nat. Clim. Chang., 4(2), 117121
Fretwell P and 59 others (2013) Bedmap2: improved ice bed, surface and thickness datasets for Antarctica. The Cryosphere, 7(1), 375393
Gladstone RM and 9 others (2012) Calibrated prediction of Pine Island Glacier retreat during the 21st and 22nd centuries with a coupled flowline model. Earth. Planet. Sci. Lett., 333–334, 191199
Greenbaum JS and 10 others (2015) Ocean access to a cavity beneath Totten Glacier in East Antarctica. Nat. Geosci., 8(4), 294298
Horgan HJ and 7 others (2013) Estuaries beneath ice sheets. Geology, 41(11), 11591162
Hughes TJ (1981) The weak underbelly of the West Antarctic ice-Sheet. J. Glaciol., 27(97), 518525
Jenkins A and 6 others (2010) Observations beneath Pine Island Glacier in West—[nbsp]—Antarctica and implications for its retreat. Nat. Geosci., 3(7), 468472
Jordan TM and 7 others (2016) An ice-sheet-wide framework for englacial attenuation from ice-penetrating radar data. Cryosphere, 10(4), 15471570
Jordan TM and 6 others (2017) Self-affine subglacial roughness: consequences for radar scattering and basal water discrimination in northern Greenland. Cryosphere, 11(3), 12471264
Joughin I, Rignot E, Rosanova CE, Lucchitta BK and Bohlander J (2003) Timing of recent accelerations of Pine Island Glacier, Antarctica. Geophys. Res. Lett., 30(13), 1706
Joughin I and 6 others (2009) Basal conditions for Pine Island and Thwaites Glaciers, West Antarctica, determined using satellite and airborne data. J. Glaciol., 55(190), 245257
Joughin I, Smith BE and Holland DM (2010) Sensitivity of 21st century sea level to ocean-induced thinning of Pine Island Glacier, Antarctica. Geophys. Res. Lett., 37(20), L20502
Joughin I, Smith BE and Medley B (2014) Marine ice sheet collapse potentially under way for the Thwaites Glacier Basin, West Antarctica. Science, 344(6185), 735738
Khazendar A and 8 others (2016) Rapid submarine ice melting in the grounding zones of ice shelves in West Antarctica. Nat. Commun., 7
Koenig L, Martin S, Studinger M and Sonntag J (2011) Polar Airborne Observations Fill Gap in Satellite Data. Eos, Trans. Amer. Geophys. Union, 91(38), 333334
Li J and 8 others (2013) High-altitude radar measurements of ice thickness over the Antarctic and Greenland ice sheets as a part of operation IceBridge. IEEE Trans. Geosci. Remote. Sens., 51(2), 742754
MacGregor JA, Catania GA, Markowski MS and Andrews AG (2012) Widespread rifting and retreat of ice-shelf margins in the eastern Amundsen Sea Embayment between 1972 and 2011. J. Glaciol., 58(209), 458466
MacGregor JA and 7 others (2013) Weak bed control of the eastern shear margin of Thwaites Glacier, West Antarctica. J. Glaciol., 59(217), 900912
MacGregor JA and 9 others (2015a) Radiostratigraphy and age structure of the Greenland Ice Sheet. J. Geophys. Res.: Earth Surface, 120(2), 212241
MacGregor JA and 11 others (2015b) Radar attenuation and temperature within the Greenland Ice Sheet. J. Geophys. Res.: Earth Surface, 120(6), 9831008
Morlighem M and 5 others (2010) Spatial patterns of basal drag inferred using control methods from a full-Stokes and simpler models for Pine Island Glacier, West Antarctica. Geophys. Res. Lett., 37(14), L14502
Mouginot J, Rignot E and Scheuchl B (2014) Sustained increase in ice discharge from the Amundsen Sea Embayment, West Antarctica, from 1973 to 2013. Geophys. Res. Lett., 41(5), 15761584
Muto A and 6 others (2016) Subglacial bathymetry and sediment distribution beneath Pine Island Glacier ice shelf modeled using aerogravity and in situ geophysical data: New results. Earth. Planet. Sci. Lett., 433, 6375
Parizek BR and 10 others (2013) Dynamic (in)stability of Thwaites Glacier, West Antarctica. J. Geophys. Res.: Earth Surf., 118(2), 638655
Park JW and 5 others (2013) Sustained retreat of the Pine Island Glacier. Geophys. Res. Lett., 40(10), 21372142
Peters ME, Blankenship DD and Morse DL (2005) Analysis techniques for coherent airborne radar sounding: Application to West Antarctic ice streams. J. Geophys. Res.: Solid Earth, 110(B6), B06303
Pritchard HD (2014) Bedgap: where next for Antarctic subglacial mapping? Antarct. Sci., 26(06), 742757
Pritchard HD, Arthern RJ, Vaughan DG and Edwards LA (2009) Extensive dynamic thinning on the margins of the Greenland and Antarctic ice sheets. Nature, 461(7266), 971975
Pritchard HD and 5 others (2012) Antarctic ice-sheet loss driven by basal melting of ice shelves. Nature, 484(7395), 502505
Rignot E, Vaughan DG, Schmeltz M, Dupont TK and MacAyeal D (2002) Acceleration of Pine island and Thwaites glaciers, west Antarctica. Ann. Glaciol., 34(1), 189194
Rignot E, Mouginot J and Scheuchl B (2011) Ice flow of the Antarctic ice sheet. Science, 333(6048), 14271430
Rignot E, Jacobs S, Mouginot J and Scheuchl B (2013) Ice-shelf melting around Antarctica. Science, 341(6143), 266270
Rignot E, Mouginot J, Morlighem M, Seroussi H and Scheuchl B (2014) Widespread, rapid grounding line retreat of Pine Island, Thwaites, Smith, and Kohler glaciers, West Antarctica, from 1992 to 2011. Geophys. Res. Lett., 41(10), 35023509
Scambos TA and 22 others (2017) How much, how fast?: A science review and outlook for research on the instability of Antarctica's Thwaites Glacier in the 21st century. Glob. Planet. Change, 153, 1634
Schodlok MP, Menemenlis D, Rignot E and Studinger M (2012) Sensitivity of the ice-shelf/ocean system to the sub-ice-shelf cavity shape measured by NASA IceBridge in Pine Island Glacier, West Antarctica. Ann. Glaciol., 53(60), 156162
Schoof C (2007) Ice sheet grounding line dynamics: Steady states, stability, and hysteresis. J. Geophys. Res.: Solid Earth, 112(F3), F03S28
Schroeder DM, Blankenship DD and Young DA (2013) Evidence for a water system transition beneath Thwaites Glacier, West Antarctica. Proc. Natl. Acad. Sci. USA, 110(30), 1222512228
Schroeder DM, Blankenship DD, Young DA and Quartini E (2014a) Evidence for elevated and spatially variable geothermal flux beneath the West Antarctic Ice Sheet. Proc. Natl. Acad. Sci. USA, 111(25), 90709072
Schroeder DM, Blankenship DD, Young DA, Witus AE and Anderson JB (2014b) Airborne radar sounding evidence for deformable sediments and outcropping bedrock beneath Thwaites Glacier, West Antarctica. Geophys. Res. Lett., 41(20), 72007208
Schroeder DM, Blankenship DD, Raney RK and Grima C (2015) Estimating subglacial water geometry using radar bed echo specularity: application to Thwaites Glacier, West Antarctica. IEEE Geosci. Remote. Sens. Lett., 12(3), 443447
Schroeder DM, Grima C and Blankenship DD (2016a) Evidence for variable grounding-zone and shear-margin basal conditions across Thwaites Glacier, West Antarctica. Geophysics, 81(1), WA35WA43
Schroeder DM, Seroussi H, Chu W and Young DA (2016b) Adaptively constraining radar attenuation and temperature across the Thwaites Glacier catchment using bed echoes. J. Glaciol., 62(236), 10751082
Scott JBT and 5 others (2009) Increased rate of acceleration on Pine Island Glacier strongly coupled to changes in gravitational driving stress. Cryosphere, 3(1), 125131
Seroussi H, Ivins ER, Wiens DA and Bondzio J (2017) Influence of a West Antarctic mantle plume on ice sheet basal conditions. J. Geophys. Res.: Solid Earth, 122(9), 7127–55
Shepherd A (2001) Inland thinning of Pine Island Glacier, West Antarctica. Science, 291(5505), 862864
Smith BE, Gourmelen N, Huth A and Joughin I (2017) Connected subglacial lake drainage beneath Thwaites Glacier, West Antarctica. Cryosphere, 11(1), 451467
Sugiyama S, Sawagaki T, Fukuda T and Aoki S (2014) Active water exchange and life near the grounding line of an antarctic outlet glacier. Earth. Planet. Sci. Lett., 399(Suppl. C), 5260
Tinto KJ and Bell RE (2011) Progressive unpinning of Thwaites Glacier from newly identified offshore ridge: Constraints from aerogravity. Geophys. Res. Lett., 38(20), L20503
Walker RT and 5 others (2013) Ice-shelf tidal flexure and subglacial pressure variations. Earth. Planet. Sci. Lett., 361, 422428
Wingham DJ, Wallis DW and Shepherd A (2009) Spatial and temporal evolution of Pine Island Glacier thinning, 1995–2006. Geophys. Res. Lett., 36(17), L17501
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