Skip to main content Accessibility help
×
Home

Thickness changes on Whillans Ice Stream and Ice Stream C, West Antarctica, derived from laser altimeter measurements

  • Vandy Blue Spikes (a1) (a2), Beáta M. Csatho (a1), Gordon S. Hamilton (a2) and Ian M. Whillans (a1)

Abstract

Repeat airborne laser altimeter measurements are used to derive surface elevation changes on parts of Whillans Ice Stream and Ice Stream C, West Antarctica. Elevation changes are converted to estimates of ice equivalent thickness change using local accumulation rates, surface snow densities and vertical bedrock motions. The surveyed portions of two major tributaries of Whillans Ice Stream are found to be thinning almost uniformly at an average rate of ∼1 m a−1. Ice Stream C has a complicated elevation-change pattern, but is generally thickening. These results are used to estimate the contribution of each surveyed region to the current rate of global sea-level rise.

  • 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.

      Thickness changes on Whillans Ice Stream and Ice Stream C, West Antarctica, derived from laser altimeter measurements
      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.

      Thickness changes on Whillans Ice Stream and Ice Stream C, West Antarctica, derived from laser altimeter measurements
      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.

      Thickness changes on Whillans Ice Stream and Ice Stream C, West Antarctica, derived from laser altimeter measurements
      Available formats
      ×

Copyright

References

Hide All
Alley, R. B. 2002. On thickening ice? Science, 295(5554), 451452.
Alley, R. B., Blankenship, D. D., Bentley, C. R. and Rooney, S.T.. 1986. Deformation of till beneath Ice Stream B, West Antarctica. Nature, 322(6074), 5759.
Alley, R. B., Blankenship, D. D., Bentley, C. R. and Rooney, S.T.. 1987. Till beneath Ice Stream B. 3. Till deformation: evidence and implications. J. Geophys. Res., 92(B9), 89218929.
Bentley, C. R., Lord, N. and Liu, C.. 1998. Radar reflections reveal a wet bed beneath stagnant Ice Stream C and a frozen bed beneath ridge BC,West Antarctica. J. Glaciol., 44(146), 149156.
Bindschadler, R. and Vornberger, P.. 1998. Changes in theWest Antarctic ice sheet since 1963 from declassified satellite photography. Science, 279(5351), 689692.
Blankenship, D. D., Bentley, C. R., Rooney, S.T. and Alley, R. B.. 1986. Seismic measurements reveal a saturated porous layer beneath an active Antarctic ice stream. Nature, 322(6074), 5457.
Blankenship, D. D., Bentley, C. R., Rooney, S.T. and Alley, R. B.. 1987. Till beneath Ice Stream B. 1. Properties derived from seismic travel times. J. Geophys. Res., 92(B9), 89038911.
Church, J. A. and 7 others. 2001. Climate change 2001: the scientific basis. In Houghton, J.T. and 7 others, eds. The scientific basis: contribution of Working Group I to the third assessment report of the Intergovernmental Panel on Climate Change. Cambridge, Cambridge University Press. Intergovernmental Panel on Climate Change, WMO/UNEP, 359405.
Cuffey, K. M. 2001. Interannual variability of elevation on the Greenland ice sheet: effects of firn densification, and establishment of a multi-century benchmark. J. Glaciol., 47(158), 369377.
Echelmeyer, K. A. and Harrison, W. D.. 1999. Ongoing margin migration of Ice Stream B, Antarctica. J. Glaciol., 45(150), 361369.
Echelmeyer, K. A., Harrison, W. D., Larsen, C. and Mitchell, J. E.. 1994.The role of the margins in the dynamics of an active ice stream. J. Glaciol., 40(136), 527538.
Engelhardt, H. and Kamb, B.. 1991. Antarctic Ice Stream B: conditions controlling its motion and interactions with the climate system. International Association of Hydrological Sciences Publication 208 (Symposium at St Petersburg 1990 — Glaciers–Ocean–Atmosphere Interactions), 145154.
Engelhardt, H. and Kamb, B.. 1997. Basal hydraulic system of a West Antarctic ice stream: constraints from borehole observations. J. Glaciol., 43(144), 207230.
Engelhardt, H., Humphrey, N., Kamb, B. and Fahnestock, M.. 1990. Physical conditions at the base of a fast moving Antarctic ice stream. Science, 248(4951), 5759.
Hamilton, G. S., Whillans, I. M. and Morgan, P. J.. 1998. First point measurements of ice-sheet thickness change in Antarctica. Ann. Glaciol., 27, 125129.
Jackson, M. and Kamb, B.. 1997. The marginal shear stress of Ice Stream B, West Antarctica. J. Glaciol., 43(145), 415426.
James, T. S. and Ivins, E. R.. 1998. Predictions of Antarctic crustal motions driven by present-day ice sheet evolution and by isostatic memory of the Last Glacial Maximum. J. Geophys. Res., 103(B3), 49935017.
Jezek, K. C. and Product Team, RAMP. 2002. RAMPAMM-1SAR image mosaic of Antarctica. Fairbanks, AK, Alaska SAR Facility, in association with the National Snow and Ice Data Center, Boulder, CO.
Joughin, I. and Tulaczyk, S.. 2002. Positive mass balance of the Ross ice streams,West Antarctica. Science, 295(5554), 476480.
Joughin, I. and 7 others. 1999. Tributaries of West Antarctic ice streams revealed by RADARSAT interferometry. Science, 286(5438), 283286.
Liu, H., Jezek, K.C. and Li, B.. 2000. RADARSAT Antarctic Mapping Project digital elevation model. Boulder, CO, National Snow and Ice Data Center. (Data available by FTP.)
Lythe, M. B., Vaughan, D. G. and BEDMAP consortium. 2000. BEDMAP — bed topography of the Antarctic. (Scale 1:10,000,000.) British Antarctic Survey. (BAS (Misc) 9, http://www.antarctica.ac.uk/aedc/bedmap/.)
Price, S. F. and Whillans, I. M.. 2001. Crevasse patterns at the onset to Ice Stream B, West Antarctica. J. Glaciol., 47(156), 2936.
Price, S. F., Bindschadler, R. A., Hulbe, C. L. and Joughin, I. R.. 2001. Post-stagnation behavior in the upstream regions of Ice Stream C, West Antarctica. J. Glaciol., 47(157), 283294.
Raymond, C. 1996. Shear margins in glaciers and ice sheets. J. Glaciol., 42(140), 90102.
Retzlaff, R. and Bentley, C. R.. 1993. Timing of stagnationof Ice Stream C, West Antarctica, from short-pulse radar studies of buried surface crevasses. J. Glaciol., 39(133), 553561.
Shabtaie, S. and Bentley, C.R.. 1987.West Antarctic ice streams draining into the Ross Ice Shelf: configuration and mass balance. J. Geophys. Res., 92(B2), 13111336. (Erratum: 92 (B9), 1987, p. 9451.)
Spikes, V. B., Csatho, B. and Whillans, I.. 2003. Laser profiling overAntarctic ice streams: methods and accuracy. J. Glaciol., 49(165), 315322.
Tulaczyk, S. M., Kamb, B. and Engelhardt, H. F.. 2000. Basal mechanics of Ice Stream B, West Antarctica. II. Undrained-plastic-bed model. J. Geophys. Res., 105(B1), 483494.
Van der Veen, C. J. 1993. Interpretation of short-time ice-sheet elevation changes inferred from satellite altimetry. Climatic Change, 23(4), 383405.
Van der Veen, C. J. and Bolzan, J. F.. 1999. Interannual variability in net accumulation on the Greenland ice sheet: observations and implications for mass balance measurements. J. Geophys. Res., 104(D2), 20092014.
Van derVeen, C. J. and Whillans, I. M.. 1996. Model experiments on the evolution and stability of ice streams. Ann. Glaciol., 23, 129137.
Venteris, E. R. and Whillans, I. M.. 1998.Variability of accumulation rate in the catchments of Ice Streams B, C, D and E, Antarctica. Ann. Glaciol., 27, 227230.
Whillans, I. M. and Bindschadler, R. A.. 1988. Mass balance of Ice Stream B, West Antarctica. Ann. Glaciol., 11, 187193.
Whillans, I. M. and van der Veen, C. J.. 1993. New and improved determinations of velocity of Ice Streams B and C, West Antarctica. J. Glaciol., 39(133), 483490.
Whillans, I. M. and van der Veen, C. J.. 1997. The role of lateral drag in the dynamics of Ice Stream B, Antarctica. J. Glaciol., 43(144), 231237.
Whillans, I. M., Bentley, C. R. and van der Veen, C. J.. 2001. Ice Streams B and C. In Alley, R. B. and Bindschadler, R. A., eds. The West Antarctic ice sheet: behavior and environment. Washington, DC, American Geophysical Union, 257281. (Antarctic Research Series 77.)
Wingham, D. J. 2000. Small fluctuations in the density and thickness of a dry firn column. J. Glaciol., 46(154), 399411.

Thickness changes on Whillans Ice Stream and Ice Stream C, West Antarctica, derived from laser altimeter measurements

  • Vandy Blue Spikes (a1) (a2), Beáta M. Csatho (a1), Gordon S. Hamilton (a2) and Ian M. Whillans (a1)

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