Skip to main content Accessibility help
×
Home

Bed properties and hydrological conditions underneath McCall Glacier, Alaska, USA

  • Frank Pattyn (a1), Charlotte Delcourt (a1), Denis Samyn (a1), Bert de Smedt (a2) and Matt Nolan (a3)...

Abstract

During three summer field seasons (2003, 2005 and 2006) we carried out radio-echo sounding measurements with a 5MHz (central frequency) ice-penetrating radar on McCall Glacier, Arctic Alaska, USA, along the central flowline and 17 cross-profiles. Two-way travel time was, after migration, converted to ice thickness, which, in combination with a recent digital elevation model of the surface of the glaciated area, resulted in a detailed map of the bed topography. This reveals a complex basal topography in the confluence area of the different glacial cirques. The pattern of subglacial water flow following the hydraulic potential gradient was calculated for the whole glacier area and shows a confluence of subglacial water downstream from the confluence of the glacier cirques. From the ice-thickness map the total ice volume was estimated as slightly less than 0.5 km3. Bed reflection power (BRP) was determined for the glacier after correction for ice-thickness dependence. Results reveal a clear relationship between the BRP pattern and basal sliding anomalies along the central flowline.

  • 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.

      Bed properties and hydrological conditions underneath McCall Glacier, Alaska, USA
      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.

      Bed properties and hydrological conditions underneath McCall Glacier, Alaska, USA
      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.

      Bed properties and hydrological conditions underneath McCall Glacier, Alaska, USA
      Available formats
      ×

Copyright

References

Hide All
Copland, L. and Sharp, M.. 2001. Mapping thermal and hydrological conditions beneath a polythermal glacier with radio-echo sounding. J. Glaciol., 47(157), 232–242.
Delcourt, C., Pattyn, F. and Nolan, M.. 2008. Modelling historical and recent mass loss of McCall Glacier, Alaska, USA. Cryosphere, 2(1), 23–31.
Gades, A.M., Raymond, C.F., Conway, H. and Jacobel, R.W.. 2000. Bed properties of Siple Dome and adjacent ice streams, West Antarctica, Inferred from radio-echo sounding measurements. J. Glaciol, 46(152), 88–94.
Kohler, J. 1995. Determining the extent of pressurized flow beneath Storglaciären, Sweden, using results of tracer experiments and measurements of input and output discharge. J. Glaciol., 41(138), 217–231.
Le Brocq, A., Payne, A.J. and Siegert, M.J.. 2006. West-Antarctic balance calculations: impact of flux-routing algorithm, smoothing algorithm and topography. Comput. Geosci., 32, 1780–1795.
Narod, B.B. and Clarke, G.K.C.. 1994. Miniature high-power impulse transmitter for radio-echo sounding. J. Glaciol., 40(134), 190–194.
Nolan, M., Arendt, A.A., Rabus, B.T. and Hinzman, L.. 2005. Volume change of McCall Glacier, Arctic Alaska, from 1956 to 2003. Ann. Glaciol., 42, 409–416.
Pattyn, F. and 6 others. 2003. Ice dynamics and basal properties of Sofiyskiy glacier, Altai mountains, Russia, based on DGPS and radio-echo sounding surveys. Ann. Glaciol., 37, 286–292.
Pattyn, F., Nolan, M., Rabus, B.T. and Takahashi, S.. 2005. Localized basal motion of a polythermal Arctic glacier: McCall Glacier, Alaska, USA. Ann. Glaciol., 40, 47–51.
Rabus, B.T. and Echelmeyer, K.A.. 1997. The flow of a polythermal glacier: McCall Glacier, Alaska, U.S.A. J. Glaciol., 43(145), 522–536.
Rabus, B.T. and Echelmeyer, K.A.. 2002. Increase of 10 m ice temperature: climate warming or glacier thinning? J. Glaciol., 48(161), 279–286.
Rabus, B.T., Echelmeyer, K.A., Trabant, D. and Benson, C.. 1995. Recent changes of McCall Glacier, Alaska. Ann. Glaciol., 21, 231–239.
Shreve, R.L. 1972. Movement ofwater in glaciers. J.Glaciol., 11(62), 205–214.

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