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Abstract

Replying to: P. W. Thorne Nature 455, 10.1038/nature07256; A. N. Grant, S. Brönnimann & L. Haimberger Nature 455, 10.1038/nature07257; C. M. Bitz & Q. Fu Nature 455, 10.1038/nature07258 (2008)

These three communicationshttps://www.nature.com/articles/nature07256https://www.nature.com/articles/nature07257https://www.nature.com/articles/nature072581,2,3 question the validity of some of our conclusions4. We found Arctic temperature trend amplification well above the boundary layer. In summer, the maximum amplification is found at a height of around 2 km, and no amplification is encountered near the surface. These findings appear in two state-of-the-art reanalyses, ERA-40 (ref. 5) and JRA-25 (ref. 6). Both these data sets show roughly the same overall vertical structure, and we believe our conclusions can be based on either of them. However, they show considerable differences regarding the magnitudes of the Arctic trends (see our Supplementary Information4), but our conclusions are not based on the absolute magnitudes.

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References

  1. Thorne, P. W. Arctic tropospheric warming amplification? Nature 455 10.1038/nature07256 (2008)

  2. Grant, A. N., Brönnimann, S. & Haimberger, L. Recent Arctic warming vertical structure contested. Nature 455 10.1038/nature07257 (2008)

  3. Bitz, C. M. & Fu, Q. Arctic warming aloft is data set dependent. Nature 455 10.1038/nature07258 (2008)

  4. Graversen, R. G., Mauritsen, T., Tjernström, M., Källén, E. & Svensson, G. Vertical structure of recent Arctic warming. Nature 451, 53–56 (2008)

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Authors and Affiliations

  1. Department of Meteorology, Stockholm University, S-106 91 Stockholm, Sweden

    R. G. Graversen, T. Mauritsen, M. Tjernström, E. Källén & G. Svensson

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  1. R. G. Graversen
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  2. T. Mauritsen
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  3. M. Tjernström
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  4. E. Källén
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  5. G. Svensson
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Graversen, R., Mauritsen, T., Tjernström, M. et al. Graversen et al. reply. Nature 455, E4–E5 (2008). https://doi.org/10.1038/nature07259

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