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Title

Inference of abrupt changes in noisy geochemical records using transdimensional changepoint models

Publication Year

2011

Author(s)
  • Gallagher, Kerry
  • Bodin, Thomas
  • Sambridge, Malcolm
  • Weiss, Dominik
  • Kylander, Malin
  • Large, David
Source
EARTH AND PLANETARY SCIENCE LETTERS Volume: 311 Issue: 1-2 Pages: 182-194 Published: 2011
ISSN
0012-821X
Abstract

We present a method to quantify abrupt changes (or changepoints) in data series, represented as a function of depth or time. These changes are often the result of climatic or environmental variations and can be manifested in multiple datasets as different responses, but all datasets can have the same changepoint locations/timings. The method we present uses transdimensional Markov chain Monte Carlo to infer probability distributions on the number and locations (in depth or time) of changepoints, the mean values between changepoints and, if required, the noise variance associated with each dataset being considered. This latter point is important as we generally will have limited information on the noise, such as estimates only of measurement uncertainty, and in most cases it is not practical to make repeat sampling/measurement to assess other contributions to the variation in the data. We describe the main features of the approach (and describe the mathematical formulation in supplementary material), and demonstrate its validity using synthetic datasets, with known changepoint structure (number and locations of changepoints) and distribution of noise variance for each dataset We show that when using multiple data, we expect to achieve better resolution of the changepoint structure than when we use each dataset individually. This is conditional on the validity of the assumption of common changepoints between different datasets. We then apply the method to two sets of real geochemical data, both from peat cores, taken from NE Australia and eastem Tibet. Under the assumption that changes occur at the same time for all datasets, we recover solutions consistent with those previously inferred qualitatively from independent data and interpretations. However, our approach provides a quantitative estimate of the relative probability of the inferred changepoints, allowing an objective assessment of the significance of each change. (C) 2011 Elsevier B.V. All rights reserved.

Author Keyword(s)
  • transdimensional changepoint models
  • geochemical data
  • Bayesian modelling
  • climate change
KeyWord(s) Plus
  • CHAIN MONTE-CARLO
  • INVERSE PROBLEMS
  • ISOTOPE VARIATIONS
  • PB
  • RECONSTRUCTION
  • DISTRIBUTIONS
  • UNCERTAINTY
  • RESOLUTION
  • AUSTRALIA
  • ATLANTIC
ESI Discipline(s)
  • Geosciences
Web of Science Category(ies)
  • Geochemistry & Geophysics
Adress(es)

[Gallagher, Kerry] Univ Rennes 1, F-35042 Rennes, France; [Bodin, Thomas; Sambridge, Malcolm] Australian Natl Univ, Res Sch Earth Sci, Canberra, ACT 0200, Australia; [Weiss, Dominik] Univ London Imperial Coll Sci Technol & Med, Dept Earth Sci & Engn, London SW7 2AZ, England; [Kylander, Malin] Stockholm Univ, Dept Geol Sci, S-10691 Stockholm, Sweden; [Large, David] Univ Nottingham, Dept Chem & Environm Engn, Nottingham NG7 2RD, England

Reprint Adress

Gallagher, K (reprint author), Univ Rennes 1, F-35042 Rennes, France.

Country(ies)
  • Australia
  • France
  • Sweden
  • United Kingdom
CNRS - Adress(es)

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Accession Number
WOS:000298270100017
uid:/1DLDCJRL
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