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Deriving global climate sensitivity from palaeoclimate reconstructions

Nature volume 360, pages 573–576 (1992)Cite this article

Abstract

To assess the future impact of anthropogenic greenhouse gases on global climate, we need a reliable estimate of the sensitivity of the Earth's climate to changes in radiative forcing. Climate sensitivity is conventionally defined as the equilibrium surface temperature increase for carbon dioxide doubling, ΔT2x. Uncertainties in cloud processes spread general circulation model (GCM) estimates of this parameter over the range 1.5< ΔT2x <4.5°C (refs 1, 2). An alternative to model-based estimates is in principle available from the reconstruction of past climates3–6, which implicitly includes cloud feedback. Here we retrieve the sensitivity of two palaeoclimates, one colder and one warmer than present, by independently reconstructing both the equilibrium surface tem-perature change and the radiative forcing. Our results yield ΔT2x = 2.3 ±0.9 °C. This range is comparable with estimates from GCMs and inferences from recent temperature observations and ocean models7,8. Future application of the method to additional climates in the geological record might constrain climate sensitivity enough to narrow the model uncertainties of global warming predictions.

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Authors and Affiliations

  1. Earth Systems Group, Department of Applied Science, New York University, New York, 10003, USA

    Martin I. Hoffert

  2. Lawrence Livermore National Laboratory, Livermore, California, 94551, USA

    Curt Covey

Authors
  1. Martin I. Hoffert
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  2. Curt Covey
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Hoffert, M., Covey, C. Deriving global climate sensitivity from palaeoclimate reconstructions. Nature 360, 573–576 (1992). https://doi.org/10.1038/360573a0

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