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Resolving the differences in the simulated and reconstructed climate response to volcanism over the last millennium
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  • Feng Zhu,
  • Julien Emile-Geay,
  • Gregory J. Hakim,
  • Jonathan King,
  • Kevin John Anchukaitis
Feng Zhu
University of Southern California, University of Southern California

Corresponding Author:fengzhu@usc.edu

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Julien Emile-Geay
University of Southern California, University of Southern California
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Gregory J. Hakim
University of Washington, University of Washington
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Jonathan King
University of Arizona, University of Arizona
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Kevin John Anchukaitis
University of Arizona, University of Arizona
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Abstract

Explosive volcanism imposes impulse-like radiative forcing on the climate system, providing a natural setting to study the climate response to perturbation. Previous studies have identified disagreements between paleoclimate reconstructions and climate model simulations (GCMs) with respect to the magnitude and recovery from volcanic cooling, questioning the fidelity of GCMs, reconstructions, or both. Using the paleoenvironmental data assimilation framework of the Last Millennium Reanalysis, this study investigates the causes of the disagreements, using both real and simulated data. We demonstrate that the disagreement may be resolved by assimilating tree-ring density records only, by targeting growing-season temperature instead of annual temperature, and by performing the comparison at proxy locales. Our work suggests that discrepancies between paleoclimate models and data can be largely resolved by accounting for these features of tree-ring proxy networks.
28 Apr 2020Published in Geophysical Research Letters volume 47 issue 8. 10.1029/2019GL086908