Climate Dynamics

, Volume 44, Issue 3, pp 791–806

Probabilistic reconstructions of local temperature and soil moisture from tree-ring data with potentially time-varying climatic response

Authors

    • AIR Worldwide Corporation
  • M. P. Tingley
    • Department of Meteorology and StatisticsPennsylvania State University
  • M. N. Evans
    • Department of GeologyUniversity of Maryland
  • M. K. Hughes
    • Laboratory of Tree-Ring ResearchUniversity of Arizona
  • D. W. Nychka
    • Institute for Mathematics Applied to GeosciencesNational Center for Atmospheric Research
Article

DOI: 10.1007/s00382-014-2139-z

Cite this article as:
Tolwinski-Ward, S.E., Tingley, M.P., Evans, M.N. et al. Clim Dyn (2015) 44: 791. doi:10.1007/s00382-014-2139-z

Abstract

We explore a probabilistic, hierarchical Bayesian approach to the simultaneous reconstruction of local temperature and soil moisture from tree-ring width observations. The model explicitly allows for differing calibration and reconstruction interval responses of the ring-width series to climate due to slow changes in climatology coupled with the biological climate thresholds underlying tree-ring growth. A numerical experiment performed using synthetically generated data demonstrates that bimodality can occur in posterior estimates of past climate when the data do not contain enough information to determine whether temperature or moisture limitation controlled reconstruction-interval tree-ring variability. This manifestation of nonidentifiability is a result of the many-to-one mapping from bivariate climate to time series of tree-ring widths. The methodology is applied to reconstruct temperature and soil moisture conditions over the 1080–1129 C.E. interval at Methusalah Walk in the White Mountains of California, where co-located isotopic dendrochronologies suggest that observed moisture limitations on tree growth may have been alleviated. Our model allows for assimilation of both data sources, and computation of the probability of a change in the climatic controls on ring-width relative to those observed in the calibration period. While the probability of a change in control is sensitive to the choice of prior distribution, the inference that conditions were moist and cool at Methuselah Walk during the 1080–1129 C.E. interval is robust. Results also illustrate the power of combining multiple proxy data sets to reduce uncertainty in reconstructions of paleoclimate.

Keywords

Bayesian hierarchical modeling Biological–statistical modeling Multiproxy paleoclimate reconstruction Tree-ring width Time-varying climate-paleodata relationship

Supplementary material

382_2014_2139_MOESM1_ESM.pdf (118 kb)
Supplementary material 1 (f 117 KB)

Copyright information

© Springer-Verlag Berlin Heidelberg 2014