Skip to main content Accessibility help
×
×
Home

The location of the grounding zone of Evans Ice Stream, Antarctica, investigated using SAR interferometry and modelling

  • Helena J. Sykes (a1), Tavi Murray (a1) and Adrian Luckman (a1)

Abstract

Evans Ice Stream, West Antarctica, has five tributaries and a complex grounding zone. The grounding zone of Evans Ice Stream, between the landward and seaward limits of tidal flexing, was mapped using SAR interferometry. The width of the mapped grounding zone was compared with that derived from an elastic beam model, and the tidal height changes derived from interferometry were compared with the results of a tidal model. Results show that in 1994 and 1996 the Evans grounding zone was located up to 100 km upstream of its location in the BEDMAP dataset. The grounding line of Evans Ice Stream is subjected to 5 m vertical tidal forcing, which would clearly affect ice-stream flow.

  • View HTML
    • Send article to Kindle

      To send this article to your Kindle, first ensure no-reply@cambridge.org is added to your Approved Personal Document E-mail List under your Personal Document Settings on the Manage Your Content and Devices page of your Amazon account. Then enter the ‘name’ part of your Kindle email address below. Find out more about sending to your Kindle. Find out more about sending to your Kindle.

      Note you can select to send to either the @free.kindle.com or @kindle.com variations. ‘@free.kindle.com’ emails are free but can only be sent to your device when it is connected to wi-fi. ‘@kindle.com’ emails can be delivered even when you are not connected to wi-fi, but note that service fees apply.

      Find out more about the Kindle Personal Document Service.

      The location of the grounding zone of Evans Ice Stream, Antarctica, investigated using SAR interferometry and modelling
      Available formats
      ×

      Send article to Dropbox

      To send this article to your Dropbox account, please select one or more formats and confirm that you agree to abide by our usage policies. If this is the first time you use this feature, you will be asked to authorise Cambridge Core to connect with your <service> account. Find out more about sending content to Dropbox.

      The location of the grounding zone of Evans Ice Stream, Antarctica, investigated using SAR interferometry and modelling
      Available formats
      ×

      Send article to Google Drive

      To send this article to your Google Drive account, please select one or more formats and confirm that you agree to abide by our usage policies. If this is the first time you use this feature, you will be asked to authorise Cambridge Core to connect with your <service> account. Find out more about sending content to Google Drive.

      The location of the grounding zone of Evans Ice Stream, Antarctica, investigated using SAR interferometry and modelling
      Available formats
      ×

Copyright

References

Hide All
Anandakrishnan, S., Voigt, D.E., Alley, R.B. and King, M.A.. 2003. Ice Stream D flow speed is strongly modulated by the tide beneath the Ross Ice Shelf. Geophys. Res. Lett., 30(7), 1361. (10.1029/2002GL016329.)
Bamber, J.L., Vaughan, D.G. and Joughin, I.. 2000. Widespread complex flow in the interior of the Antarctic ice sheet. Science, 287(5456), 1248–1250.
Bindschadler, R. 2006. The environment and evolution of the West Antarctic ice sheet: setting the stage. Philos. Trans. R. Soc. London, Ser. A, 364(1844), 1583–1605.
Bindschadler, R.A., King, M.A., Alley, R.B., Anandakrishnan, S. and Padman, L.. 2003. Tidally controlled stick–slip discharge of aWest Antarctic ice stream. Science, 301(5636), 1087–1089.
Doake, C.S.M. 1992. Gravimetric tidal measurement on Filchner Ronne Ice Shelf. FRISP Rep., 34–39.
Fricker, H.A. and Padman, L.. 2006. Ice shelf grounding zone structure from ICESat laser altimetry. Geophys. Res. Lett., 33(15), L15502. (10.1029/2006GL026907.)
Gudmundsson, G.H. 2006. Fortnightly variations in the flow velocity of Rutford Ice Stream, West Antarctica. Nature, 444(7122), 1063–1064.
Gudmundsson, G.H. 2007. Tides and the flow of Rutford Ice Stream, West Antarctica. J. Geophys. Res., 112(F4), F04007. (10.1029/2006JF000731.)
Jenkins, A., Corr, H.F.J., Nicholls, K.W., Stewart, C.L. and Doake, C.S.M.. 2006. Interactions between ice and ocean observed with phase-sensitive radar near an Antarctic ice-shelf grounding line. J. Glaciol., 52(178), 325–346.
Joughin, I. and Bamber, J.L.. 2005. Thickening of the ice stream catchments feeding the Filchner–Ronne Ice Shelf, Antarctica. Geophys. Res. Lett., 32(17), L17503. (10.1029/2005GL023844.)
Joughin, I., Bamber, J.L., Scambos, T., Tulaczyk, S., Fahnestock, M. and MacAyeal, D.R.. 2006. Integrating satellite observations with modelling: basal shear stress of the Filcher–Ronne ice streams, Antarctica. Philos. Trans. R. Soc. London, Ser. A, 364(1844), 1795–1814.
Lythe, M.B., Vaughan, D.G. and BEDMAP consortium. 2001. BEDMAP: a new ice thickness and subglacial topographic model of Antarctica. J. Geophys. Res., 106(B6), 11,335–11,351.
Padman, L., Fricker, H.A., Coleman, R., Howard, S. and Erofeeva, L.. 2002. A new tide model for the Antarctic ice shelves and seas. Ann. Glaciol., 34, 247–254.
Pawlowicz, R., Beardsley, B. and Lentz, S.. 2002. Classical tidal harmonic analysis including error estimates in MATLAB using T−TIDE. Comput. Geosci., 28(8), 929–937.
Reeh, N., Lintz Christensen, E., Mayer, C. and Olesen, O.B.. 2003. Tidal bending of glaciers: a linear viscoelastic approach. Ann. Glaciol., 37, 83–89.
Rignot, E. 1998. Radar interferometry detection of hinge-line migration on Rutford Ice Stream and Carlson Inlet, Antarctica. Ann. Glaciol., 27, 25–32.
Schoof, C. 2007. Ice sheet grounding line dynamics: steady states, stability, and hysteresis. J. Geophys. Res., 112(F3), F03S28. (10.1029/2006JF000664.)
Smith, A.M. 1991. The use of tiltmeters to study the dynamics of Antarctic ice-shelf grounding lines. J. Glaciol., 37(125), 51–58.
Stephenson, S.N. 1984. Glacier flexure and the position of grounding lines: measurements by tiltmeter on Rutford Ice Stream, Antarctica. Ann. Glaciol., 5, 165–169.
Vaughan, D.G. 1994. Investigating tidal flexure on an ice shelf using kinematic GPS. Ann. Glaciol., 20, 372–376.
Vaughan, D.G. 1995. Tidal flexure at ice shelf margins. J. Geophys. Res., 100(B4), 6213–6224.
Vaughan, D.G., Smith, A.M., Nath, P.C. and Le Meur, E.. 2003. Acoustic impedance and basal shear stress beneath four Antarctic ice streams. Ann. Glaciol., 36, 225–232.
Vieli, A. and Payne, A.J.. 2005. Assessing the ability of numerical ice sheet models to simulate grounding line migration. J. Geophys. Res., 110(F1), F01003. (10.1029/2004JF000202.)
Weertman, J. 1974. Stability of the junction of an ice sheet and an ice shelf. J. Glaciol., 13(67), 3–11.
Zebker, H.A., Rosen, P.A., R.M. Goldstein, , Gabriel, A. and Werner, C.L.. 1994. On the derivation of coseismic displacement fields using differential radar interferometry: the Landers earthquake. J. Geophys. Res., 99(B10), 19,617–19,634.
Recommend this journal

Email your librarian or administrator to recommend adding this journal to your organisation's collection.

Annals of Glaciology
  • ISSN: 0260-3055
  • EISSN: 1727-5644
  • URL: /core/journals/annals-of-glaciology
Please enter your name
Please enter a valid email address
Who would you like to send this to? *
×

Metrics

Full text views

Total number of HTML views: 0
Total number of PDF views: 0 *
Loading metrics...

Abstract views

Total abstract views: 0 *
Loading metrics...

* Views captured on Cambridge Core between <date>. This data will be updated every 24 hours.

Usage data cannot currently be displayed