Skip to main content Accessibility help
×
Home

A ground-based radar for measuring vertical strain rates and time-varying basal melt rates in ice sheets and shelves

  • Keith W. Nicholls (a1), Hugh F.J. Corr (a1), Craig L. Stewart (a2), Lai Bun Lok (a3), Paul V. Brennan (a3) and David G. Vaughan (a1)...

Abstract

The ApRES (autonomous phase-sensitive radio-echo sounder) instrument is a robust, lightweight and relatively inexpensive radar that has been designed to allow long-term, unattended monitoring of ice-shelf and ice-sheet thinning. We describe the instrument and demonstrate its capabilities and limitations by presenting results from three trial campaigns conducted in different Antarctic settings. Two campaigns were ice sheet-based – Pine Island Glacier and Dome C – and one was conducted on the Ross Ice Shelf. The ice-shelf site demonstrates the ability of the instrument to collect a time series of basal melt rates; the two grounded ice applications show the potential to recover profiles of vertical strain rate and also demonstrate some of the limitations of the present system.

  • 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.

      A ground-based radar for measuring vertical strain rates and time-varying basal melt rates in ice sheets and shelves
      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.

      A ground-based radar for measuring vertical strain rates and time-varying basal melt rates in ice sheets and shelves
      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.

      A ground-based radar for measuring vertical strain rates and time-varying basal melt rates in ice sheets and shelves
      Available formats
      ×

Copyright

Copyright © International Glaciological Society 2015 This is an Open Access article, distributed under the terms of the Creative Commons Attribution license. (http://creativecommons.org/licenses/by/4.0/), which permits unrestricted re-use, distribution, and reproduction in any medium, provided the original work is properly cited.

Corresponding author

Correspondence: Keith W. Nicholls <kwni@bas.ac.uk>

References

Hide All
Arzeno, IB and 7 others (2014) Ocean variability contributing to basal melt rate near the ice front of Ross Ice Shelf, Antarctica. J. Geophys. Res., 119(7), 42144233 (doi: 10.1002/2014jc009792)
Bishop, JF and Walton, JLW (1981) Bottom melting under George VI Ice Shelf, Antarctica. J. Glaciol., 27(97), 429447
Brennan, PV, Lok, L-B, Nicholls, KW and Corr, HFJ (2013) Phase-sensitive FMCW radar system for high-precision Antarctic ice shelf profile monitoring. IET Radar Sonar Navig., 8(7), 776786 (doi: 10.1049/iet-rsn.2013.0053)
Corr, HFJ, Jenkins, A, Nicholls, KW and Doake, CSM (2002) Precise measurement of changes in ice-shelf thickness by phase-sensitive radar to determine basal melt rates. Geophys. Res. Lett., 29(8) (doi: 10.1029/2001GL014618)
Dutrieux, P and 6 others (2013) Pine Island Glacier ice shelf melt distributed at kilometre scales. Cryosphere, 7(5), 15431555 (doi: 10.5194/tc-7-1543-2013)
Dutrieux, P and 6 others (2014) Basal terraces on melting ice shelves. Geophys. Res. Lett., 41(15), 55065513 (doi: 10.1002/2014gl060618)
Fricker, HA, Hyland, G, Coleman, R and Young, NW (2000) Digital elevation models for the Lambert Glacier–Amery Ice Shelf system, East Antarctica, from ERS-1 satellite radar altimetry. J. Glaciol., 46(155), 553560
Gade, HG (1979) Melting of ice in sea water: a primitive model with application to the Antarctic ice shelf and icebergs. J. Phys. Oceanogr., 9(1), 189198
Gillet-Chaulet, F, Hindmarsh, RCA, Corr, HFJ, King, EC and Jenkins, A (2011) In-situ quantification of ice rheology and direct measurement of the Raymond Effect at Summit, Greenland using a phase-sensitive radar. Geophys. Res. Lett., 38, L24503 (doi: 10.1029/2011gl049843)
Jenkins, A and Doake, CSM (1991) Ice–ocean interactions on Ronne Ice Shelf, Antarctica. J. Geophys. Res., 96(C1), 791813 (doi: 10.1029/90jc01952)
Jenkins, A, Corr, HFJ, Nicholls, KW, Stewart, CL and Doake, CSM (2006) Interactions between ice and ocean observed with phase-sensitive radar near an Antarctica ice-shelf grounding line. J. Glaciol., 52(178), 325346 (doi: 10.3189/172756506781828502)
Jenkins, A and 6 others (2010) Observations beneath Pine Island Glacier in West Antarctica and implications for its retreat. Nature Geosci., 3(7), 468472 (doi: 10.1038/ngeo890)
Kingslake, J and 9 others (2014) Full-depth englacial vertical ice sheet velocities measured using phase-sensitive radar. J. Geophys. Res., 119, 26042618 (doi: 10.1002/ 2014JF003275)
Martin, C, Mulvaney, R, Gudmundsson, GH and Corr, HFJ (2015) Inferring palaeo-accumulation records from ice-core data by an adjoint-based method: application to James Ross Island’s ice core. Climate Past, 11, 547557 (doi: 10.5194/cp-11-547-2015)
Moholdt, G, Padman, L and Fricker, HA (2014) Basal mass budget of Ross and Filchner–Ronne ice shelves, Antarctica, derived from Lagrangian analysis of ICESat altimetry. J. Geophys. Res., 119(11), 23612380 (doi: 10.1002/2014jf003171)
Nicholls, KW and 21 others (2006) Measurements beneath an Antarctic ice shelf using an autonomous underwater vehicle. Geophys. Res. Lett., 33, L08612 (doi: 10.1029/2006GL025998)
Nicholls, KW, Abrahamsen, EP, Heywood, KJ, Stansfield, K and Østerhus, S (2008) High-latitude oceanography using the Autosub autonomous underwater vehicle. Limnol. Oceanogr., 53(5 pt 2), 23092320
Nicholls, KW, Østerhus, S, Makinson, K, Gammelsrød, T and Fahrbach, E (2009) Ice–ocean processes over the continental shelf of the southern Weddell Sea, Antarctica: a review. Rev. Geophys., 47, RG3003 (doi: 10.1029/2007RG000250)
Pritchard, HD, Arthern, RJ, Vaughan, DG and Edwards, LA (2009) Extensive dynamic thinning on the margins of the Greenland and Antarctic ice sheets. Nature, 461, 971975 (doi: 10.1038/nature08471)
Rignot, E, Jacobs, S, Mouginot, J and Scheuchl, B (2013) Ice-shelf melting around Antarctica. Science, 341(6143), 266270 (doi: 10.1126/science.1235798)
Schoof, C (2007) Ice sheet grounding line dynamics: steady states, stability, and hysteresis. J. Geophys. Res., 112, F03s28 (doi: 10.1029/2006jf000664)
Shepherd, A, Wingham, D and Rignot, E (2004) Warm ocean is eroding West Antarctic Ice Sheet. Geophys. Res. Lett., 31(23), L23402 (doi: 10.1029/2004GL021106)
Vaughan, DG and 9 others (1995) Subglacial and seabed topography, ice thickness and water column thickness in the vicinity of Filchner-Ronne-Schelfeis, Antarctica. Polarforschung, 64(2), 7588
Walford, MER and Harper, MFL (1981) The detailed study of glacier beds using radio-echo techniques. Geophys. J. R. Astron. Soc., 67(2), 487514 (doi: 10.1111/j.1365-246X.1981.tb02762.x)
Williams, MJM, Jenkins, A and Determann, J (1998) Physical controls on ocean circulation beneath ice shelves revealed by numerical models. In Jacobs, SS and Weiss, R eds Ocean, ice, and atmosphere: interactions at the Antarctic continental margin. American Geophysical Union, Washington, DC, 285299 (doi: 10.1029/AR075p0285)

Keywords

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