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A theory for polar amplification from a general circulation perspective

Asia-Pacific Journal of Atmospheric Sciences volume 50, pages 31–43 (2014)Cite this article

Abstract

Records of the past climates show a wide range of values of the equator-to-pole temperature gradient, with an apparent universal relationship between the temperature gradient and the globalmean temperature: relative to a reference climate, if the global-mean temperature is higher (lower), the greatest warming (cooling) occurs at the polar regions. This phenomenon is known as polar amplification. Understanding this equator-to-pole temperature gradient is fundamental to climate and general circulation, yet there is no established theory from a perspective of the general circulation. Here, a general circulation-based theory for polar amplification is presented. Recognizing the fact that most of the available potential energy (APE) in the atmosphere is untapped, this theory invokes that La-Niña-like tropical heating can help tap APE and warm the Arctic by exciting poleward and upward propagating Rossby waves.

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  1. The Pennsylvania State University, University Park, Pennsylvania, USA

    Sukyoung Lee

  2. School of Earth and Environmental Sciences, Seoul National University, Seoul, Korea

    Sukyoung Lee

  3. Department of Meteorology, The Pennsylvania State University, 503 Walker Building, University Park, PA, 16802, USA

    Sukyoung Lee

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Lee, S. A theory for polar amplification from a general circulation perspective. Asia-Pacific J Atmos Sci 50, 31–43 (2014). https://doi.org/10.1007/s13143-014-0024-7

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Keywords

  • Polar amplification
  • general circulation
  • equable climate