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Calving fluxes and basal melt rates of Antarctic ice shelves

A Corrigendum to this article was published on 23 October 2013

Abstract

Iceberg calving has been assumed to be the dominant cause of mass loss for the Antarctic ice sheet, with previous estimates of the calving flux exceeding 2,000 gigatonnes per year1,2. More recently, the importance of melting by the ocean has been demonstrated close to the grounding line and near the calving front3,4,5. So far, however, no study has reliably quantified the calving flux and the basal mass balance (the balance between accretion and ablation at the ice-shelf base) for the whole of Antarctica. The distribution of fresh water in the Southern Ocean and its partitioning between the liquid and solid phases is therefore poorly constrained. Here we estimate the mass balance components for all ice shelves in Antarctica, using satellite measurements of calving flux and grounding-line flux, modelled ice-shelf snow accumulation rates6 and a regional scaling that accounts for unsurveyed areas. We obtain a total calving flux of 1,321 ± 144 gigatonnes per year and a total basal mass balance of −1,454 ± 174 gigatonnes per year. This means that about half of the ice-sheet surface mass gain is lost through oceanic erosion before reaching the ice front, and the calving flux is about 34 per cent less than previous estimates derived from iceberg tracking1,2,7. In addition, the fraction of mass loss due to basal processes varies from about 10 to 90 per cent between ice shelves. We find a significant positive correlation between basal mass loss and surface elevation change for ice shelves experiencing surface lowering8 and enhanced discharge9. We suggest that basal mass loss is a valuable metric for predicting future ice-shelf vulnerability to oceanic forcing.

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Figure 1: Basal mass loss and calving fluxes of Antarctic ice shelves.
Figure 2: Mean basal mass-loss rates of Antarctic ice shelves.
Figure 3: Ice-shelf surface lowering rates versus mean basal mass-loss rates.

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References

  1. Jacobs, S. S., Helmer, H. H., Doake, C. S. M., Jenkins, A. & Frolich, R. M. Melting of ice shelves and the mass balance of Antarctica. J. Glaciol. 38, 375–387 (1992)

    Article  ADS  Google Scholar 

  2. Orheim, O. in Glaciers, Ice Sheets and Sea Level: Effect of a CO2-Induced Climatic Change 210–215 (National Academic, 1985)

    Google Scholar 

  3. Jenkins, A. & Doake, C. S. M. Ice-ocean interaction on Ronne Ice Shelf, Antarctica. J. Geophys. Res. 96, 791–813 (1991)

    Article  ADS  Google Scholar 

  4. Rignot, E. & Jacobs, S. S. Rapid bottom melting widespread near Antarctic ice sheet grounding lines. Science 296, 2020–2023 (2002)

    Article  CAS  ADS  Google Scholar 

  5. Joughin, I. & Padman, L. Melting and freezing beneath Filchner-Ronne Ice Shelf, Antarctica. Geophys. Res. Lett. 30, 1477 (2003)

    Article  ADS  Google Scholar 

  6. Lenaerts, J. T. M., van den Broeke, M. R., van de Berg, W. J., van Meijgaard, E. & Kuipers Munneke, P. A new, high-resolution surface mass balance map of Antarctica (1979–2010) based on regional atmospheric climate modeling. Geophys. Res. Lett. 39, L04501 (2012)

    Article  ADS  Google Scholar 

  7. Silva, T. A. M., Bigg, G. R. & Nicholls, K. W. Contribution of giant icebergs to the Southern Ocean freshwater flux. J. Geophys. Res. 111, C03004 (2006)

    ADS  Google Scholar 

  8. Pritchard, H. D. et al. Antarctic ice-sheet loss driven by basal melting of ice shelves. Nature 484, 502–505 (2012)

    Article  CAS  ADS  Google Scholar 

  9. Pritchard, H. D., Arthern, R. J., Vaughan, D. G. & Edwards, L. A. Extensive dynamic thinning on the margins of the Greenland and Antarctic ice sheets. Nature 461, 971–975 (2009)

    Article  CAS  ADS  Google Scholar 

  10. Dupont, T. K. & Alley, R. B. Assessment of the importance of ice-shelf buttressing to ice-sheet flow. Geophys. Res. Lett. 32, L04503 (2005)

    Article  ADS  Google Scholar 

  11. De Angelis, H. & Skvarca, P. Glacier surge after ice shelf collapse. Science 299, 1560–1562 (2003)

    Article  CAS  ADS  Google Scholar 

  12. Doake, C. S. M. & Vaughan, D. G. Rapid disintegration of the Wordie Ice Shelf in response to atmospheric warming. Nature 350, 328–330 (1991)

    Article  ADS  Google Scholar 

  13. Raiswell, R., Benning, L., Tranter, M. & Tulaczyk, S. Bioavailable iron in the Southern Ocean: the significance of the iceberg conveyor belt. Geochem. Trans. 9, 7 (2008)

    Article  Google Scholar 

  14. Yu, J., Liu, H., Jezek, K. C., Warner, R. C. & Wen, J. Analysis of velocity field, mass balance, and basal melt of the Lambert Glacier-Amery Ice Shelf system by incorporating Radarsat SAR interferometry and ICESat laser altimetry measurements. J. Geophys. Res. 115, B11102 (2010)

    Article  ADS  Google Scholar 

  15. Nicholls, K. W., Makinson, K. & Johnson, M. R. New oceanographic data from beneath Ronne Ice Shelf, Antarctica. Geophys. Res. Lett. 24, 167–170 (1997)

    Article  ADS  Google Scholar 

  16. Williams, M. J. M., Jenkins, A. & Determann, J. in Ocean, Ice, and Atmosphere: Interactions at the Antarctic Continental Margin 285–299 (Antarct. Res. Ser. 75, AGU, 1998)

    Google Scholar 

  17. Hellmer, H. H. Impact of Antarctic ice shelf basal melting on sea ice and deep ocean properties. Geophys. Res. Lett. 31, L10307 (2004)

    Article  ADS  Google Scholar 

  18. Timmermann, R., Wang, Q. & Hellmer, H. H. Ice-shelf basal melting in a global finite-element sea-ice/ice-shelf/ocean model. Ann. Glaciol. 53, (2012)

  19. Griggs, J. A. & Bamber, J. L. Antarctic ice-shelf thickness from satellite radar altimetry. J. Glaciol. 57, 485–498 (2011)

    Article  ADS  Google Scholar 

  20. Rignot, E., Mouginot, J. & Scheuchl, B. Ice flow of the Antarctic ice sheet. Science 333, 1427–1430 (2011)

    Article  CAS  ADS  Google Scholar 

  21. King, M. A. et al. Lower satellite-gravimetry estimates of Antarctic sea-level contribution. Nature 491, 586–589 (2012)

    Article  CAS  ADS  Google Scholar 

  22. Hellmer, H. H., Kauker, F., Timmermann, R., Determann, J. & Rae, J. Twenty-first-century warming of a large Antarctic ice-shelf cavity by a redirected coastal current. Nature 485, 225–228 (2012)

    Article  CAS  ADS  Google Scholar 

  23. Potter, J. R., Paren, J. G. & Loynes, J. Glaciological and oceanographic calculations of the mass balance and oxygen isotope ratio of a melting ice shelf. J. Glaciol. 30, 161–170 (1984)

    Article  ADS  Google Scholar 

  24. Fricker, H. A., Popov, S., Allison, I. & Young, N. Distribution of marine ice beneath the Amery Ice Shelf. Geophys. Res. Lett. 28, 2241–2244 (2001)

    Article  ADS  Google Scholar 

  25. Holland, P. R., Corr, H. F. J., Vaughan, D. G., Jenkins, A. & Skvarca, P. Marine ice in Larsen ice shelf. Geophys. Res. Lett. 36, L11604 (2009)

    Article  ADS  Google Scholar 

  26. Zotikov, I. A., Zagorodnov, V. S. & Raikovsky, J. V. Core drilling through the Ross ice shelf (Antarctica) confirmed basal freezing. Science 207, 1463–1465 (1980)

    Article  CAS  ADS  Google Scholar 

  27. Whitehouse, M. J. et al. Substantial primary production in the land-remote region of the central and northern Scotia Sea. Deep-Sea Res. II 59–60, 47–56 (2012)

    Article  ADS  Google Scholar 

  28. Alderkamp, A.-C. et al. Iron from melting glaciers fuels phytoplankton blooms in the Amundsen Sea (Southern Ocean): phytoplankton characteristics and productivity. Deep-Sea Res. II 71–76, 32–48 (2012)

    Article  ADS  Google Scholar 

  29. Smith, K. L. et al. Free-drifting icebergs: hot spots of chemical and biological enrichment in the Weddell Sea. Science 317, 478–482 (2007)

    Article  CAS  ADS  Google Scholar 

  30. Zwally, H. J. et al. Mass changes of the Greenland and Antarctic ice sheets and shelves and contributions to sea-level rise: 1992–2002. J. Glaciol. 51, 509–527 (2005)

    Article  ADS  Google Scholar 

  31. Ligtenberg, S. R. M., Helsen, M. M. & van den Broeke, M. R. An improved semi-empirical model for the densification of Antarctic firn. Cryosphere 5, 809–819 (2011)

    Article  ADS  Google Scholar 

Download references

Acknowledgements

This work was supported by funding from the ice2sea programme of the European Union Seventh Framework Programme, grant number 226375. This work is ice2sea contribution number 139. M.R.v.d.B., J.T.M.L. and S.R.M.L. acknowledge funding from the Netherlands Polar Programme. J.L.B. was supported by NERC grant NE/I027401/1.

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M.A.D. produced the results, led the development of the study and wrote the manuscript. J.L.B. had the idea for the study and contributed to the development of the methods, to the discussion of results and, extensively, to writing the manuscript. J.A.G. produced the calving-front elevation error and provided the ice-shelf elevation. J.T.M.L. and M.R.v.d.B. provided the SMB data and error analysis. S.R.M.L. and M.R.v.d.B. provided the firn data and error analysis. G.M. provided the grounding-line and ice-shelf mask data and discussion. All authors commented on the manuscript.

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Correspondence to M. A. Depoorter or J. L. Bamber.

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The authors declare no competing financial interests.

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This file contains a Supplementary Discussion, Supplementary Tables 1 and 2, Supplementary Figures 1-6 and Supplementary References. (PDF 2721 kb)

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Depoorter, M., Bamber, J., Griggs, J. et al. Calving fluxes and basal melt rates of Antarctic ice shelves. Nature 502, 89–92 (2013). https://doi.org/10.1038/nature12567

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