Skip to main content Accessibility help
×
×
Home

Sensitivity of the ice-shelf/ocean system to the sub-ice-shelf cavity shape measured by NASA IceBridge in Pine Island Glacier, West Antarctica

  • Michael P. Schodlok (a1) (a2), Dimitris Menemenlis (a2), Eric Rignot (a2) (a3) and Michael Studinger (a4)

Abstract

Two high-resolution (1 km grid) numerical model simulations of the Amundsen Sea, West Antarctica, are used to study the role of the ocean in the mass loss and grounding line retreat of Pine Island Glacier. The first simulation uses BEDMAP bathymetry under the Pine Island ice shelf, and the second simulation uses NASA IceBridge-derived bathymetry. The IceBridge data reveal the existence of a trough from the ice-shelf edge to the grounding line, enabling warm Circumpolar Deep Water to penetrate to the grounding line, leading to higher melt rates than previously estimated. The mean melt rate for the simulation with NASA IceBridge data is 28 ma–1, much higher than previous model estimates but closer to estimates from remote sensing. Although the mean melt rate is 25% higher than in the simulation with BEDMAP bathymetry, the temporal evolution remains unchanged between the two simulations. This indicates that temporal variability of melting is mostly driven by processes outside the cavity. Spatial melt rate patterns of BEDMAP and IceBridge simulations differ significantly, with the latter in closer agreement with satellite-derived melt rate estimates of ~50ma–1 near the grounding line. Our simulations confirm that knowledge of the cavity shape and its time evolution are essential to accurately capture basal mass loss of Antarctic ice shelves.

  • 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.

      Sensitivity of the ice-shelf/ocean system to the sub-ice-shelf cavity shape measured by NASA IceBridge in Pine Island Glacier, West Antarctica
      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.

      Sensitivity of the ice-shelf/ocean system to the sub-ice-shelf cavity shape measured by NASA IceBridge in Pine Island Glacier, West Antarctica
      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.

      Sensitivity of the ice-shelf/ocean system to the sub-ice-shelf cavity shape measured by NASA IceBridge in Pine Island Glacier, West Antarctica
      Available formats
      ×

Copyright

References

Hide All
Bindschadler, R, Vaughan, DG and Vornberger, P (2011) Variability of basal melt beneath the Pine Island Glacier ice shelf, West Antarctica. J. Glaciol., 57(204), 581–595 (doi: 10.3189/002214311797409802)
Boyer, TP and 8 others (2006) World Ocean Database 2005. In Levitus, S ed. NOAA Atlas NESDIS 60. US Government Printing Office, Washington DC
Griggs, JA and Bamber, JL (2011) Antarctic ice-shelf thickness from satellite radar altimetry. J. Glaciol., 57(203), 485–498 (doi: 10.3189/002214311796905659)
Hellmer, HH and Olbers, DJ (1989) A two-dimensional model for the thermohaline circulation under an ice shelf. Antarct. Sci., 1(4), 325–336
Hellmer, HH, Jacobs, SS and Jenkins, A (1998) Oceanic erosion of a floating Antarctic glacier in the Amundsen Sea. In Jacobs, SS and Weiss, RF, eds. Ocean, ice and atmosphere: interactions at the Antarctic continental margin. American Geophysical Union, Washington, DC, 83–100 (Antarctic Research Series 75)
Holland, DM and Jenkins, A (1999) Modeling thermodynamic ice– ocean interactions at the base of an ice shelf. J. Phys. Oceanogr., 29(8), 1787–1800 (doi: 10.1175/1520-0485(1999)029<1787: MTIOIA>2.0.CO;2)
Holland, PR, Jenkins, A, Holland, DM (2008) The response of ice shelf basal melting to variations in ocean temperature. J. Climate, 21(11), 2558–2572
Holland, PR, Jenkins, A, Holland, DM (2010) Ice and ocean processes in the Bellingshausen Sea, Antarctica. J. Geophys. Res. 115(C5), C05020 (doi:10.1029/2008JC005219)
Jacobs, S (2006) Observations of change in the Southern Ocean. Philos. Trans. R. Soc. London, Ser. A, 364(1844), 1657–1681 (doi: 10.1098/rsta.2006.1794)
Jacobs, SS, Hellmer, HH and Jenkins, A (1996) Antarctic ice sheet melting in the southeast Pacific. Geophys. Res. Lett., 23(9), 957–960
Jacobs, SS, Jenkins, A, Giulivi C Fand Dutrieux, P (2011) Stronger ocean circulation and increased melting under Pine Island Glacier ice shelf. Nature Geosci., 4(8), 519–523 (doi: 10.1038/ngeo1188)
Jenkins, A, Hellmer, HH and Holland, DM (2001) The role of meltwater advection in the formulation of conservative boundary conditions at an ice–ocean interface. J. Phys. Oceanogr., 31(1), 285–296 (doi: 10.1175/1520-0485(2001)031<0285: TROMAI>2.0.CO;2)
Jenkins, A and 6 others (2010) Observations beneath Pine Island Glacier in West Antarctica and implications for its retreat. Nature Geosci., 3(7), 468–472 (doi: 10.1038/ngeo890)
Joughin, I, Rignot, E, Rosanova, CE, Lucchitta, BK and Bohlander, J (2003) Timing of recent accelerations of Pine Island Glacier, Antarctica. Geophys. Res. Lett., 30(13), 1706 (doi: 10.1029/2003GL017609)
Joughin, I, Smith, BE, Holland, DM (2010) Sensitivity of 21st century sea level to ocean-induced thinning of Pine Island Glacier, Antarctica. Geophys. Res. Lett., 37(20), L20502 (doi: 10.1029/2010GL044819)
Losch, M (2008) Modeling ice shelf cavities in a z coordinate ocean general circulation model. J. Geophys. Res., 113(C8), C08043 (doi: 10.1029/2007JC004368)
Losch, M, Menemenlis, D, Campin, J-M, Heimbach Pand Hill, C (2010) On the formulation of sea-ice models. Part I: effects of different solver implications and parameterizations. Ocean Model., 33 (1–2), 129–144 (doi: 10.1016/j.ocemod.2009.12.008)
Lythe, MB, Vaughan, DG and BEDMAP consortium (2001) BEDMAP: a new ice thickness and subglacial topographic model of Antarctica. J. Geophys. Res., 106(B6), 11 335–11 351
Menemenlis, D and 7 others (2008) ECCO2: high resolution global ocean and sea ice data synthesis. Mercator Ocean Sci. Newsl. 31, 13–21
Morlighem, M, Rignot, E, Seroussi, H, Larour, E, Ben Dhia, H and Aubry, D (2010) Spatial patterns of basal drag inferred using control methods from a full-Stokes and simpler models for Pine Island Glacier, West Antarctica. Geophys. Res. Lett., 37(14), L14502 (doi: 10.1029/2010GL043853)
Nitsche, FO, Jacobs, SS, Larter, RD and Gohl, K (2007) Bathymetry of the Amundsen Sea continental shelf: implications for geology, oceanography, and glaciology. Geochem. Geophys. Geosyst., 8(Q10), Q10009 (doi: 10.1029/2007GC001694)
Onogi, K and 16 others (2007) The JRA-25 reanalysis. J. Meteorol. Soc. Jpn, 85(3), 369–432
Payne, AJ, Holland, PR, Shepherd, AP, Rutt, IC, Jenkins, A and Joughin, I (2007) Numerical modeling of ocean–ice interactions under Pine Island Bay’s ice shelf. J. Geophys. Res., 112(C10), C10019 (doi: 10.1029/2006JC003733)
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(7266), 971–975 (doi: 10.1038/nature08471)
Rignot, EJ (1998) Fast recession of a West Antarctic glacier. Science, 281(5376), 549–551
Rignot, E (2002) Ice-shelf changes in Pine Island Bay, Antarctica, 1947–2000. J. Glaciol., 48(161), 247–256 (doi: 10.3189/172756502781831386)
Rignot, E and 6 others (2008) Recent Antarctic ice mass loss from radar interferometry and regional climate modelling. Nature Geosci., 1(2), 106–110 (doi: 10.1038/ngeo102)
Shepherd, A, Wingham, D and Rignot, E (2004) Warm ocean is eroding West Antarctic Ice Sheet. Geophys. Res. Lett., 31(23), L23404 (doi: 10.1029/2004GL021106)
Smith, WHF and Sandwell, DT (1997) Global sea floor topography from satellite altimetry and ship depth soundings. Science, 277(5334), 1956–1962
Studinger, M and 10 others (2010) Mapping Pine Island Glacier’s sub-ice cavity with airborne gravimetry. In AGU Fall Meeting 2010, 13–17 December 2010, San Francisco, CA. American Geophysical Union, Washington DC (Abstr. C11A-0528)
Thoma, M, Jenkins, A, Holland, D and Jacobs, S (2008) Modelling circumpolar deep water intrusions on the Amundsen Sea continental shelf, Antarctica. Geophys. Res. Lett., 35(18), L18602 (doi: 10.1029/2008GL034939)
Thomas, R and 17 others (2004) Accelerated sea-level rise from West Antarctica. Science, 306(5694), 255–258
Wåhlin, AK, Yuan, X, Björk, G and Nohr, C (2010) Inflow of warm circumpolar deep water in the Central Amundsen Shelf. J. Phys. Oceanogr., 40(6), 1427–1434 (doi: 10.1175/2010JPO4431.1)
Walker, DP, Brandon, MA, Jenkins, A, Allen, JT, Dowdeswell, JA and Evans, J (2007) Oceanic heat transport onto the Amundsen Sea shelf through a submarine glacial trough. Geophys. Res. Lett., 34(2), L02602 (doi: 10.1029/2006GL028154)
Recommend this journal

Email your librarian or administrator to recommend adding this journal to your organisation's collection.

Annals of Glaciology
  • ISSN: 0260-3055
  • EISSN: 1727-5644
  • URL: /core/journals/annals-of-glaciology
Please enter your name
Please enter a valid email address
Who would you like to send this to? *
×

Metrics

Altmetric attention score

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