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Observational and model evidence of global emergence of permanent, unprecedented heat in the 20th and 21st centuries

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  • Published: 07 June 2011
  • volume 107, pages 615–624 (2011)
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Observational and model evidence of global emergence of permanent, unprecedented heat in the 20th and 21st centuries
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  • Noah S. Diffenbaugh1 &
  • Martin Scherer1 
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Abstract

Given the severe impacts of extreme heat on natural and human systems, we attempt to quantify the likelihood that rising greenhouse gas concentrations will result in a new, permanent heat regime in which the coolest warm-season of the 21st century is hotter than the hottest warm-season of the late 20th century. Our analyses of global climate model experiments and observational data reveal that many areas of the globe are likely to permanently move into such a climate space over the next four decades, should greenhouse gas concentrations continue to increase. In contrast to the common perception that high-latitude areas face the most accelerated response to global warming, our results demonstrate that in fact tropical areas exhibit the most immediate and robust emergence of unprecedented heat, with many tropical areas exhibiting a 50% likelihood of permanently moving into a novel seasonal heat regime in the next two decades. We also find that global climate models are able to capture the observed intensification of seasonal hot conditions, increasing confidence in the projection of imminent, permanent emergence of unprecedented heat.

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Authors and Affiliations

  1. Department of Environmental Earth System Science and Woods Institute for the Environment, Stanford University, 473 Via Ortega, Stanford, CA, 94305-4216, USA

    Noah S. Diffenbaugh & Martin Scherer

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  1. Noah S. Diffenbaugh
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  2. Martin Scherer
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Correspondence to Noah S. Diffenbaugh.

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Open Access This is an open access article distributed under the terms of the Creative Commons Attribution Noncommercial License (https://creativecommons.org/licenses/by-nc/2.0), which permits any noncommercial use, distribution, and reproduction in any medium, provided the original author(s) and source are credited.

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Diffenbaugh, N.S., Scherer, M. Observational and model evidence of global emergence of permanent, unprecedented heat in the 20th and 21st centuries. Climatic Change 107, 615–624 (2011). https://doi.org/10.1007/s10584-011-0112-y

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  • Received: 08 March 2011

  • Accepted: 16 May 2011

  • Published: 07 June 2011

  • Issue Date: August 2011

  • DOI: https://doi.org/10.1007/s10584-011-0112-y

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Keywords

  • Late 20th Century
  • Extreme Heat
  • Seasonal Heat
  • Heat Regime
  • CMIP3 Ensemble

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