Publication Abstracts

Rao et al. 2019

Rao, M.P., E.R. Cook, B.I. Cook, K.J. Anchukaitis, R.D. D'Arrigo, P.J. Krusic, and A.N. LeGrande, 2019: A double bootstrap approach to Superposed Epoch Analysis to evaluate response uncertainty. Dendrochronologia, 55, 119-124, doi:10.1016/j.dendro.2019.05.001.

The association between climate variability and episodic events, such as the antecedent moisture conditions prior to wildfire or the cooling following volcanic eruptions, is commonly assessed using Superposed Epoch Analysis (SEA). In SEA the epochal response is typically calculated as the average climate conditions prior to and following all event years or their deviation from climatology. However, the magnitude and significance of the inferred climate association may be sensitive to the selection or omission of individual key years, potentially resulting in a biased assessment of the relationship between these events and climate. Here we describe and test a modified double-bootstrap SEA that generates multiple unique draws of the key years and evaluates the sign, magnitude, and significance of event-climate relationships within a probabilistic framework. This multiple resampling helps quantify multiple uncertainties inherent in conventional applications of SEA within dendrochronology and paleoclimatology. We demonstrate our modified SEA by evaluating the volcanic cooling signal in a Northern Hemisphere tree-ring temperature reconstruction and the link between drought and wildfire events in the western United States. Finally, we make our Matlab and R code available to be adapted for future SEA applications.

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BibTeX Citation

  author={Rao, M. P. and Cook, E. R. and Cook, B. I. and Anchukaitis, K. J. and D'Arrigo, R. D. and Krusic, P. J. and LeGrande, A. N.},
  title={A double bootstrap approach to Superposed Epoch Analysis to evaluate response uncertainty},

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RIS Citation

ID  - ra06900s
AU  - Rao, M. P.
AU  - Cook, E. R.
AU  - Cook, B. I.
AU  - Anchukaitis, K. J.
AU  - D'Arrigo, R. D.
AU  - Krusic, P. J.
AU  - LeGrande, A. N.
PY  - 2019
TI  - A double bootstrap approach to Superposed Epoch Analysis to evaluate response uncertainty
JA  - Dendrochronologia
VL  - 55
SP  - 119
EP  - 124
DO  - 10.1016/j.dendro.2019.05.001
ER  -

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