Peak detection in sediment - charcoal records: impacts of alternative data analysis methods on fire-history interpretations
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- 1 January 2010
- journal article
- research article
- Published by CSIRO Publishing in International Journal of Wildland Fire
- Vol. 19 (8), 996-1014
- https://doi.org/10.1071/wf09134
Abstract
Over the past several decades, high-resolution sediment–charcoal records have been increasingly used to reconstruct local fire history. Data analysis methods usually involve a decomposition that detrends a charcoal series and then applies a threshold value to isolate individual peaks, which are interpreted as fire episodes. Despite the proliferation of these studies, methods have evolved largely in the absence of a thorough statistical framework. We describe eight alternative decomposition models (four detrending methods used with two threshold-determination methods) and evaluate their sensitivity to a set of known parameters integrated into simulated charcoal records. Results indicate that the combination of a globally defined threshold with specific detrending methods can produce strongly biased results, depending on whether or not variance in a charcoal record is stationary through time. These biases are largely eliminated by using a locally defined threshold, which adapts to changes in variability throughout a charcoal record. Applying the alternative decomposition methods on three previously published charcoal records largely supports our conclusions from simulated records. We also present a minimum-count test for empirical records, which reduces the likelihood of false positives when charcoal counts are low. We conclude by discussing how to evaluate when peak detection methods are warranted with a given sediment–charcoal record.Keywords
This publication has 68 references indexed in Scilit:
- Short Paper: A signal-to-noise index to quantify the potential for peak detection in sediment–charcoal recordsQuaternary Research, 2011
- Long‐term fire frequency variability in the eastern Canadian boreal forest: the influences of climate vs. local factorsGlobal Change Biology, 2009
- Wildfire responses to abrupt climate change in North AmericaProceedings of the National Academy of Sciences of the United States of America, 2009
- Frequent Fires in Ancient Shrub Tundra: Implications of Paleorecords for Arctic Environmental ChangePLOS ONE, 2008
- Geographical and temporal trends in Late Quaternary fire histories of Fuego-Patagonia, South AmericaQuaternary Science Reviews, 2004
- Geographic and temporal variations in fire history in boreal ecosystems of AlaskaJournal of Geophysical Research: Atmospheres, 2002
- The Role of Fire During Climate Change in an Eastern Deciduous Forest at Devil's Bathtub, New YorkEcology, 1996
- A 750-year fire history based on lake sediment records in central Yellowstone National Park, USAThe Holocene, 1995
- Robust Locally Weighted Regression and Smoothing ScatterplotsJournal of the American Statistical Association, 1979
- Robust Tests for the Equality of VariancesJournal of the American Statistical Association, 1974