Article

Winter warming in West Antarctica caused by central tropical Pacific warming

  • Nature Geoscience volume 4, pages 398403 (2011)
  • doi:10.1038/ngeo1129
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Abstract

The Pacific sector of Antarctica, including both the Antarctic Peninsula and continental West Antarctica, has experienced substantial warming in the past 30 years. An increase in the circumpolar westerlies, owing in part to the decline in stratospheric ozone concentrations since the late 1970s, may account for warming trends in the peninsula region in austral summer and autumn. The more widespread warming in continental West Antarctica (Ellsworth Land and Marie Byrd Land) occurs primarily in austral winter and spring, and remains unexplained. Here we use observations of Antarctic surface temperature and global sea surface temperature, and atmospheric circulation data to show that recent warming in continental West Antarctica is linked to sea surface temperature changes in the tropical Pacific. Over the past 30 years, anomalous sea surface temperatures in the central tropical Pacific have generated an atmospheric Rossby wave response that influences atmospheric circulation over the Amundsen Sea, causing increased advection of warm air to the Antarctic continent. General circulation model experiments show that the central tropical Pacific is a critical region for producing the observed high latitude response. We conclude that, by affecting the atmospheric circulation at high southern latitudes, increasing tropical sea surface temperatures may account for West Antarctic warming through most of the twentieth century.

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Acknowledgements

This work was supported by the US National Science Foundation, grant numbers OPP-0837988 and 0963924. We thank G. Hoffman for providing the code for ECHAM4.6, and P. Hezel, A. Jenkins, G. H. Roe, D. P. Schneider and S. Schoenemann for fruitful comments.

Author information

Affiliations

  1. Quaternary Research Center and Department of Earth and Space Sciences, University of Washington, Seattle, Washington 98195, USA

    • Qinghua Ding
    • , Eric J. Steig
    •  & Marcel Küttel
  2. Department of Atmospheric Sciences, University of Washington, Seattle, Washington 98195, USA

    • David S. Battisti

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Contributions

Q.D. did the calculations, implemented the general circulation model experiments, created the figures, and led the writing of the paper. All authors contributed to the experimental design and writing of the paper.

Competing interests

The authors declare no competing financial interests.

Corresponding author

Correspondence to Eric J. Steig.

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