Warming of the Antarctic ice-sheet surface since the 1957 International Geophysical Year (original) (raw)

Nature volume 457, pages 459–462 (2009)Cite this article

A Corrigendum to this article was published on 06 August 2009

Abstract

Assessments of Antarctic temperature change have emphasized the contrast between strong warming of the Antarctic Peninsula and slight cooling of the Antarctic continental interior in recent decades1. This pattern of temperature change has been attributed to the increased strength of the circumpolar westerlies, largely in response to changes in stratospheric ozone2. This picture, however, is substantially incomplete owing to the sparseness and short duration of the observations. Here we show that significant warming extends well beyond the Antarctic Peninsula to cover most of West Antarctica, an area of warming much larger than previously reported. West Antarctic warming exceeds 0.1 °C per decade over the past 50 years, and is strongest in winter and spring. Although this is partly offset by autumn cooling in East Antarctica, the continent-wide average near-surface temperature trend is positive. Simulations using a general circulation model reproduce the essential features of the spatial pattern and the long-term trend, and we suggest that neither can be attributed directly to increases in the strength of the westerlies. Instead, regional changes in atmospheric circulation and associated changes in sea surface temperature and sea ice are required to explain the enhanced warming in West Antarctica.

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Acknowledgements

E.J.S. and D.P.S. were supported by the US National Science Foundation, grant numbers OPP-0440414 and OPP-0126161, as part of the US ITASE programme. M.E.M. was supported by the US National Science Foundation, grant number OPP-0125670. We thank D. Winebrenner, A. Monaghan, D. Bromwich, J. Turner, P. Mayewski, T. Scambos, E. Bard and O. Bellier.

Author Contributions E.J.S., D.P.S., S.D.R. and M.E.M. made the reconstruction and statistical calculations. J.C.C. performed the cloud-masking calculations and provided the updated satellite data set. D.T.S. provided the general circulation model output and guided its interpretation. E.J.S. wrote the paper. All authors discussed the results and commented on the manuscript.

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Authors and Affiliations

  1. Department of Earth and Space Sciences and Quaternary Research Center, University of Washington, Seattle, Washington 98195, USA,
    Eric J. Steig
  2. National Center for Atmospheric Research, Boulder, Colorado 80307, USA ,
    David P. Schneider
  3. Department of Environmental Science, Roger Williams University, Bristol, Rhode Island, USA,
    Scott D. Rutherford
  4. Department of Meteorology, and Earth and Environmental Systems Institute, Pennsylvania State University, University Park, Pennsylvania 16802, USA,
    Michael E. Mann
  5. NASA Laboratory for Hydrospheric and Biospheric Sciences, NASA Goddard Space Flight Center, Greenbelt, Maryland 20771, USA ,
    Josefino C. Comiso
  6. NASA Goddard Institute for Space Studies and Center for Climate Systems Research, Columbia University, New York, New York 10025, USA ,
    Drew T. Shindell

Authors

  1. Eric J. Steig
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  2. David P. Schneider
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  3. Scott D. Rutherford
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  4. Michael E. Mann
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  5. Josefino C. Comiso
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  6. Drew T. Shindell
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Corresponding author

Correspondence toEric J. Steig.

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Steig, E., Schneider, D., Rutherford, S. et al. Warming of the Antarctic ice-sheet surface since the 1957 International Geophysical Year.Nature 457, 459–462 (2009). https://doi.org/10.1038/nature07669

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Editorial Summary

Antarctic warming: climate reconstruction gets to the heart of the continent

The Antarctic Peninsula is one of the most rapidly warming locations on Earth, but it has been difficult to establish whether continent-wide changes are comparable to the clear upward trend in global average temperature. This is because most of the continuous records from ice-sheet weather stations are coastal, providing little information on the continental interior. This problem is by-passed in a new reconstruction of Antarctic surface temperature trends for 1957–2006, based on satellite data (with good spatial coverage for a short period) and air temperatures from weather stations (for a long timescale), blended via an algorithm that estimates missing data points in climate fields. The resulting record, more reliable than previous gap-filling exercises, suggests that overall the continent is warming by about 0.1 °C per decade, with stronger warming in winter and spring and over West Antarctica.