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Volume 12, issue 4
Volume 12, issue 4
The Cryosphere, 12, 1387–1400, 2018
https://doi.org/10.5194/tc-12-1387-2018
© Author(s) 2018. This work is distributed under
the Creative Commons Attribution 4.0 License.
The Cryosphere, 12, 1387–1400, 2018
https://doi.org/10.5194/tc-12-1387-2018
© Author(s) 2018. This work is distributed under
the Creative Commons Attribution 4.0 License.
Volume 12, issue 4

Research article 17 Apr 2018

Research article | 17 Apr 2018

Grounding line migration through the calving season at Jakobshavn Isbræ, Greenland, observed with terrestrial radar interferometry

Surui Xie et al.

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Aðalgeirsdóttir, G., Smith, A. M., Murray, T., King, M. A., Makinson, K., Nicholls, K. W., and Behar, A. E.: Tidal influence on Rutford Ice Stream, West Antarctica: observations of surface flow and basal processes from closely spaced GPS and passive seismic stations, J. Glaciol., 54, 715–724, https://doi.org/10.3189/002214308786570872, 2008.
Amundson, J. M., Fahnestock, M., Truffer, M., Brown, J., Lüthi, M. P., and Motyka, R. J.: Ice mélange dynamics and implications for terminus stability, Jakobshavn Isbræ, Greenland, J. Geophys. Res., 115, F01005, https://doi.org/10.1029/2009JF001405, 2010.
An, L., Rignot, E., Elieff, S., Morlighem, M., Millan, R., Mouginot, J., Holland, D. M., Holland, D., and Paden, J.: Bed elevation of Jakobshavn Isbræ, West Greenland, from high-resolution airborne gravity and other data, Geophys. Res. Lett., 44, 3728–3736, https://doi.org/10.1002/2017GL073245, 2017.
Anandakrishnan, S. and Alley, R. B.: Tidal forcing of basal seismicity of ice stream C, West Antarctica, observed far inland, J. Geophys. Res., 102, 15183–15196, https://doi.org/10.1029/97JB01073, 1997.
Clarke, T. S. and Echelmeyer, K.: Seismic-reflection evidence for a deep subglacial trough beneath Jakobshavns Isbræ, West Greenland, J. Glaciol., 42, 219–232, https://doi.org/10.1017/S0022143000004081, 1996.
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Time-varying velocity and topography of the terminus of Jakobshavn Isbræ were observed with a terrestrial radar interferometer in three summer campaigns (2012, 2015, 2016). Surface elevation and tidal responses of ice speed suggest a narrow floating zone in early summer, while in late summer the entire glacier is likely grounded. We hypothesize that Jakobshavn Isbræ advances a few km in winter to form a floating zone but loses this floating portion in the subsequent summer through calving.
Time-varying velocity and topography of the terminus of Jakobshavn Isbræ were observed with a...
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The Cryosphere

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