Preprints
https://doi.org/10.5194/cp-2022-69
https://doi.org/10.5194/cp-2022-69
 
09 Sep 2022
09 Sep 2022
Status: this preprint is currently under review for the journal CP.

Frequency of large volcanic eruptions over the past 200,000 years

Eric W. Wolff1, Andrea Burke2, Laura Crick2, Emily A. Doyle1, Helen M. Innes2, Sue H. Mahony3, James W. B. Rae2, Mirko Severi4, and R. Stephen J. Sparks3 Eric W. Wolff et al.
  • 1Department of Earth Sciences, University of Cambridge, Cambridge CB2 3EQ, United Kingdom
  • 2School of Earth & Environmental Sciences, University of St Andrews, St Andrews, KY16 9AL, United Kingdom
  • 3School of Earth Sciences, University of Bristol, Bristol BS8 1RJ, United Kingdom
  • 4Chemistry Department, University of Florence, Sesto F.no (FI) 50019, Italy

Abstract. Volcanic eruptions are the dominant cause of natural variability in climate forcing on timescales up to multidecadal. Large volcanic eruptions lead to global-scale climate effects and influence the carbon cycle on long timescales. However, estimating the frequency of eruptions is challenging. Here we assess the frequency at which eruptions with particular deposition fluxes are observed in the EPICA Dome C ice core over the last 200 kyr. Using S isotope analysis we confirm that most of the largest peaks recorded at Dome C are from stratospheric eruptions. The cumulative frequency through 200 kyr is close to linear suggesting an approximately constant rate of eruptions. There is no evidence for an increase in the rate of events recorded in Antarctica at either of the last two deglaciations. Millennial variability is at the level expected from recording small numbers of eruptions, while multimillennial variability may be partly due to changes in transport efficiency through the Brewer-Dobson circulation. Our record of events with sulfate deposition rates > 20 mg m-2 and >50 mg m-2 contains 678 and 75 eruptions respectively over the last 200 kyr. Calibration with data on historic eruptions and analysis of a global Quaternary dataset of terrestrial eruptions indicates that sulfate peaks with deposition rates > 20 mg m-2 and >50 mg m-2 correspond to explosive eruptions of magnitude ≥ 6.5 and ≥ 7 respectively. The largest recorded eruption deposited just over 300 mg m-2.

Eric W. Wolff et al.

Status: open (until 04 Nov 2022)

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Eric W. Wolff et al.

Eric W. Wolff et al.

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Short summary
Large volcanic eruptions leave an imprint of a spike of sulfate deposition that can be measured in ice cores. Here we use a method that logs the number and size of large eruptions recorded in an Antarctic core in a consistent way through the last 200,000 years. The rate of recorded eruptions is variable but shown no trends. In particular there is no increase in recorded eruptions during deglaciation periods. This is consistent with most recorded eruptions being from lower latitudes.