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Title of Journal: Climatic Change

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Abbravation: Climatic Change

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Springer Netherlands

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1573-1480

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Increased probability of fire during late Holocene

Authors: Michael J Clifford Robert K Booth
Publish Date: 2013/04/20
Volume: 119, Issue: 3-4, Pages: 693-704
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Abstract

Understanding the role of fire in the Earth system and particularly regional controls on its frequency and severity is critical to risk assessment Charcoal records from lake sediment and firescar networks from longlived tree species have improved our understanding of longterm relationships between fire events and climate This work has primarily focused on historically fireprone ecosystems and regions In the northeastern USA where wildfire has been relatively infrequent in historical times firerisk assessments have incorporated littletono prehistorical data and little is known about longterm fireclimate relationships We developed coupled highresolution records of moisture variability and fire from three ombrotrophic peatlands in Maine using testate amoebae and analysis of microscopic charcoal Watertable depth reconstructions among the three sites were generally coherent with highmagnitude dry and wet events corresponding within the uncertainty of agedepth models At all sites there was a significantly higher probability of fire events during highmagnitude droughts However although prolonged droughts were widespread and associated with higher probability of fire the fire events were rarely synchronous among sites with the exception of ~550 years before present yr BP when all three sites experienced both drought and fire While fire has been relatively uncommon in the northeastern USA during the past century our records clearly highlight the potential vulnerability of the region to future drought and fire impacts Results also demonstrate the utility of coupled records of fire and climate in understanding regional fireclimate dynamicsThis research was funded by the National Science Foundation Paleo Perspectives on Climate Change EAR0902441 J Nichols generously provided samples and radiocarbon dates from Great Heath A Ireland T Andrews K LeBoeuf and M Spicer provided helpful discussions of the paper The manuscript benefited from the reviews of G Swindles and two anonymous reviewers

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