• shareshare
  • link
  • cite
  • add
Other research product . 2020

The influence of water percolation through crevasses on the thermal regime of a Himalayan mountain glacier

Gilbert, Adrien; Sinisalo, Anna; Gurung, Tika R.; Fujita, Koji; Maharjan, Sudan B.; Sherpa, Tenzing C.; Fukuda, Takehiro;
Open Access
Published: 17 Apr 2020
In cold and arid climates, small glaciers with cold accumulation zones are often thought to be entirely cold based. However, scattering in ground-penetrating radar (GPR) measurements on the Rikha Samba Glacier in the Nepal Himalayas suggests a large amount of temperate ice that seems to be influenced by the presence of crevassed areas. We used a coupled thermo-mechanical model forced by a firn model accounting for firn heating to interpret the observed thermal regime. Using a simple energy conservation approach, we show that the addition of water percolation and refreezing in crevassed areas explains these observations. Model experiments show that both steady and transient thermal regimes are significantly affected by latent heat release in crevassed areas. This makes half of the glacier base temperate, resulting in an ice dynamic mainly controlled by basal friction instead of ice deformation. The timescale of thermal regime change, in response to atmospheric warming, is also greatly diminished, with a potential switch from cold to temperate basal ice in 50–60 years in the upper part of the glacier instead of the 100–150 years that it would take without the effect of the crevasses. This study highlights the crucial role of water percolation through the crevasses on the thermal regime of glaciers and validates a simple method to account for it in glacier thermo-mechanical models.
50 references, page 1 of 5

Aschwanden, A., Bueler, E., Khroulev, C., and Blatter, H.: An enthalpy formulation for glaciers and ice sheets, J. Glaciol., 58, 441-457,, 2012.

Bennett, M. M. and Glasser, N. F.: Glacial Geology: Ice Sheets and Landforms, John Wiley & Sons, Oxford, ISBN 978-0-470- 51690-4, 2011.

Boon, S. and Sharp, M.: The role of hydrologically-driven ice fracture in drainage system evolution on an Arctic glacier, Geophys. Res. Lett., 30, 18,, 2003.

Calonne, N., Flin, F., Morin, S., Lesaffre, B., Rolland du Roscoat, S., and Geindreau, C.: Numerical and experimental investigations of the effective thermal conductivity of snow, Geophys. Res. Lett., 38, L23501,, 2011. [OpenAIRE]

Cuffey, K. and Paterson, W. S. B.: The Physics of Glaciers, Elsevier, Butterworth-Heineman, Burlington, MA, USA, ISBN 9781493300761, 2010.

Dee, D. P., Uppala, S. M., Simmons, A. J., Berrisford, P., Poli, P., Kobayashi, S., Andrae, U., Balmaseda, M. A., Balsamo, G., Bauer, P., Bechtold, P., Beljaars, A. C. M., van de Berg, L., Bidlot, J., Bormann, N., Delsol, C., Dragani, R., Fuentes, M., Geer, A. J., Haimberger, L., Healy, S. B., Hersbach, H., Hólm, E. V., Isaksen, L., Kållberg, P., Köhler, M., Matricardi, M., McNally, A. P., Monge-Sanz, B. M., Morcrette, J.-J., Park, B.-K., Peubey, C., de Rosnay, P., Tavolato, C., Thépaut, J.-N., and Vitart, F.: The ERA-Interim reanalysis: configuration and performance of the data assimilation system, Q. J. Roy. Meteorol. Soc., 137, 553- 597,, 2011.

Elmer/Ice: Elmer/Ice wiki, available at: elmerice/wiki/doku.php, last access: 9 April 2020.

Faillettaz, J., Sornette, D., and Funk, M.: Numerical modeling of a gravity-driven instability of a cold hanging glacier: reanalysis of the 1895 break-off of Altelsgletscher, Switzerland, J. Glaciol., 57, 817-831,, 2011. [OpenAIRE]

Fischer, A.: Calculation of glacier volume from sparse ice-thickness data, applied to Schaufelferner, Austria, J. Glaciol., 55, 453-460,, 2009.

Fountain, A. G. and Walder, J. S.: Water flow through temperate glaciers, Rev. Geophys., 36, 299-328, https://, 1998.

Funded by
Global Glacier Mass Continuity
  • Funder: European Commission (EC)
  • Project Code: 320816
  • Funding stream: FP7 | SP2 | ERC
SNSF| Entwicklung eines neuen Verfahrens zur Mutagenizitätsprüfung an menschlichen Keimzellen
  • Funder: Swiss National Science Foundation (SNSF)
  • Project Code: 3200-006104
  • Funding stream: Projects | Project funding ; Project funding | Project funding (Div. I-III)
Download from