Skip to main content Accessibility help
×
×
Home

The “Galloping Glacier” trots: decadal-scale speed oscillations within the quiescent phase

  • Matt Nolan (a1)

Abstract

A 28 year record of annual surface speeds has revealed oscillations with a period of roughly 12 years during the quiescent phase of Black Rapids Glacier, Alaska, U.S.A., the original “Galloping Glacier”. These oscillations are hypothesized to be the manifestation of slowly propagating waves of till failure and till healing, with at least the second cycle being initiated by the anomalous advance of a tributary glacier. Observations support the idea that such dynamics may have occurred, but are not conclusive. In the conceptual model describing the mechanisms of till failure and healing, temporal variations in longitudinal stress gradients are proposed to be more important in causing till failure than temporal variations in effective pressure.

  • 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 “Galloping Glacier” trots: decadal-scale speed oscillations within the quiescent phase
      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 “Galloping Glacier” trots: decadal-scale speed oscillations within the quiescent phase
      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 “Galloping Glacier” trots: decadal-scale speed oscillations within the quiescent phase
      Available formats
      ×

Copyright

References

Hide All
Anandakrishnan, S., Alley, R. B., Jacobel, R.W. and Conway, H.. 2001. The flow regime of Ice Stream C and hypotheses concerning its recent stagnation. in Alley, R. B. and Bindschadler, R.A., eds. The West Antarctic Ice Sheet: Behavior and Environment. Washington, DC, American Geophysical Union, 283294. (Antarctic Research Series 77.)
Fatland, D. R. 1998. Studies of Bagley Icefield During Surge and Black Rapids Glacier, Alaska, Using Spaceborne SAR Interferometry. (Ph.D. thesis, University of Alaska Fairbanks.)
Fatland, D., Lingle, C. and Truffer, M.. 2003 . A surface motion survey of Black Rapids Glacier, Alaska. Ann. Glaciol., 36 (see paper in this volume).
Gades, A.M. 1998. Spatial and Temporal Variations of Basal Conditions Beneath Glaciers and Ice Sheets Inferred From Radio Echo Soundings. (Ph.D. thesis, University of Washington.)
Harrison, W. D., Mayo, L. R. and Trabant, D. C.. 1975. Temperature measurements on Black Rapids Glacier, Alaska, 1973. in Weller, G. and Bowling, S. A., eds. Climate of The Arctic. Fairbanks, AK, University of Alaska. Geophysical Institute, 350352.
Heinrichs, T. A., Mayo, L. R., Trabant, D. C. and March, R. S.. 1994. Observations of the surge-type Black Rapids Glacier, Alaska, during a quiescent period, 1970–92. U.S. Geol. Surv. Open File Rep. 94-512.
Heinrichs, T.A., Mayo, L. R., Echelmeyer, K. A. and Harrison, W. D.. 1996. Quiescent-phase evolution of a surge-type glacier: Black Rapids Glacier, Alaska, U. S.A. J. Glaciol.,42(140),110122.
Iken, A. and Truffer, M.. 1997. The relationship between subglacial water pressure and velocity of Findelengletscher, Switzerland, during its advance and retreat. J. Glaciol., 43(144),328338.
Nolan, M. and Echelmeyer, K.. 1999a. Seismic detection of transient changes beneath Black Rapids Glacier, Alaska, U.S.A.: I. Techniques and observations. J. Glaciol., 45(149), 119131.
Nolan, M. and Echelmeyer, K.. 1999b. Seismic detection of transient changes beneath Black Rapids Glacier, Alaska, U.S.A.: II. Basal morphology and processes. J. Glaciol., 45(149),132146.
Paterson, W. S. B. 1994. The Physics of Glaciers. third edition. Oxford, etc., Elsevier.
Raymond, C. F. and Nolan, M.. 2000. Drainage of a glacial lake through an ice spillway. International Association of Hydrological Sciences Publication (Symposium at Seattle 2000− debris-covered glaciers), 199207.
Raymond, C. F., Benedict, R.J., Harrison, W. D., Echelmeyer, K. A. and Sturm, M.. 1995. Hydrological discharges and motion of Fels and Black Rapids Glaciers, Alaska, U.S.A.: implications for the structure of their drainage systems. J. Glaciol., 41(138), 290304.
Sturm, M. 1987. Observations on the distribution and characteristics of potholes on surging glaciers. J. Geophys. Res., 92(), 90159022.
Sturm, M. and Cosgrove, D. M.. 1990. Correspondence. An unusual jökulhlaup involving potholes on Black Rapids Glacier, Alaska Range, Alaska, U.S.A. J. Glaciol., 36(122), 125126.
Truffer, M., Motyka, R. J., Harrison, W. D., Echelmeyer, K. A., Fisk, B. and Tulaczyk, S.. 1999. Subglacial drilling at Black Rapids Glacier, Alaska, U.S.A.: drilling method and sample descriptions. J. Glaciol., 45(151), 495505.
Truffer, M., Harrison, K. A. and Echelmeyer, W. D.. 2001. Implications of till deformation on glacier dynamics. J. Glaciol., 47(156),123134.
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