TITLE

Tidally driven ice speed variation at Helheim Glacier, Greenland, observed with terrestrial radar interferometry

AUTHOR(S)
VOYTENKO, Denis; STERN, Alon; HOLLAND, David M.; DIXON, Timothy H.; CHRISTIANSON, Knut; WALKER, Ryan T.
PUB. DATE
March 2015
SOURCE
Journal of Glaciology;2015, Vol. 61 Issue 226, p301
SOURCE TYPE
Academic Journal
DOC. TYPE
Article
ABSTRACT
We used a terrestrial radar interferometer (TRI) at Helheim Glacier, Greenland, in August 2013, to study the effects of tidal forcing on the terminal zone of this tidewater glacier. During our study period, the glacier velocity was up to 25md-1. Our measurements show that the glacier moves out of phase with the semi-diurnal tides and the densely packed melange in the fjord. Here detrended glacier displacement lags behind the forecasted tidal height by ~8 hours. The transition in phase lag between the glacier and the melange happens within a narrow (~500 m) zone in the fjord in front of the ice cliff. The TRI data also suggest that the impact of tidal forcing decreases rapidly up-glacier of the terminus. A flowline model suggests this pattern of velocity perturbation is consistent with weak ice flowing over a weakly nonlinear bed.
ACCESSION #
102885556

 

Related Articles

  • Cryosphere: Glacier reaches record speed.  // Nature;2/13/2014, Vol. 506 Issue 7487, p135 

    The article focuses on a study by researcher Ian Joughin and colleagues published in the journal "The Cryosphere" in 2014, according to which glacier's movement in Greenland has sped up by 30–50 percent from 2012-2014 and the glacier moved with a pace of more than 17 kilometres per year...

  • Unsteady compression waves in interferometer windows. Hayes, Dennis // Journal of Applied Physics;6/1/2001, Vol. 89 Issue 11, p6484 

    Optical windows for the velocity interferometer system for any reflector perturb the measurement of specimen/window interface velocity during compression wave experiments. The perturbation is caused by the variation of window index of refraction with density. The correction for shocks and steady...

  • Recession, thinning, and slowdown of Greenland's Mittivakkat Gletscher. Mernild, S. H.; Knudsen, N. T.; Yde, J. C.; Hoffman, M. J.; Lipscomb, W. H.; Fausto, R. S.; Hanna, E.; Malmros, J. K. // Cryosphere Discussions;2012, Vol. 6 Issue 3, p2005 

    The article discusses the changes of Mittivakkat Gletscher glacier in Greenland with observation that it have thinned and receded throughout the past several decades. It documents changes with surface velocity measurements and long-term mass balance observations. It is noted that the glacier...

  • Are seasonal calving dynamics forced by buttressing from ice mélange or undercutting by melting? Outcomes from full-Stokes simulations of Store Glacier, West Greenland. Todd, J.; Christoffersen, P. // Cryosphere;2014, Vol. 8 Issue 6, p2353 

    We use a full-Stokes 2-D model (Elmer/Ice) to investigate the flow and calving dynamics of Store Glacier, a fast-flowing outlet glacier in West Greenland. Based on a new, subgrid-scale implementation of the crevasse depth calving criterion, we perform two sets of simulations: one to identify the...

  • Segmentation and Tracking of Anticyclonic Eddies during a Submarine Volcanic Eruption Using Ocean Colour Imagery. Marcello, Javier; Eugenio, Francisco; Estrada-Allis, Sheila; Sangrà, Pablo // Sensors (14248220);2015, Vol. 15 Issue 4, p8732 

    The eruptive phase of a submarine volcano located 2 km away from the southern coast of El Hierro Island started on October 2011. This extraordinary event provoked a dramatic perturbation of the water column. In order to understand and quantify the environmental impacts caused, a regular...

  • Glaciology: Lost photos reveal glacier shifts.  // Nature;5/31/2012, Vol. 485 Issue 7400, p551 

    The article reports that aerial photographs of Greenlandic glaciers from the 1930s could provide much knowledge on the impact of climate change on glaciers than the use of satellite imagery alone.

  • Marine ice-sheet profiles and stability under Coulomb basal conditions. TSAI, Victor C.; STEWART, Andrew L.; THOMPSON, Andrew F. // Journal of Glaciology;2015, Vol. 61 Issue 226, p205 

    The behavior of marine-terminating ice sheets, such as the West Antarctic ice sheet, is of interest due to the possibility of rapid grounding-line retreat and consequent catastrophic loss of ice. Critical to modeling this behavior is a choice of basal rheology, where the most popular approach is...

  • Uncertainty in mass-balance trends derived from altimetry: a case study along the EGIG line, central Greenland. MORRIS, Elizabeth M.; WINGHAM, Duncan J. // Journal of Glaciology;2015, Vol. 61 Issue 226, p345 

    Repeated measurements of density profiles and surface elevation along a 515km traverse of the Greenland ice sheet are used to determine elevation change rates and the error in determining mass-balance trends from these rates which arises from short-term fluctuations in mass input, compaction and...

  • Transport properties of a single-quantum dot Aharonov-Bohm interferometer. Son, D. N.; Arboleda Jr., N.; Arboleda Jr., W. A.; Kasai, H. // European Physical Journal B -- Condensed Matter;May2007, Vol. 57 Issue 1, p27 

    We consider a two-terminal Aharonov-Bohm (AB) interferometer with a quantum dot inserted in one path of the AB ring. We investigate the transport properties of this system in and out of the Kondo regime. We utilize perturbation theory to calculate the electron self-energy of the quantum dot with...

Share

Read the Article

Courtesy of THE LIBRARY OF VIRGINIA

Sorry, but this item is not currently available from your library.

Try another library?
Sign out of this library

Other Topics