Linked fire activity and climate whiplash in California during the early Holocene

Julia Homann, Jessica L. Oster*, Cameron B. de Wet, Sebastian F. M. Breitenbach, Thorsten Hoffmann

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

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Abstract

Recent wildfire activity in semi-arid regions like western North America exceeds the range of historical records. High-resolution paleoclimate archives such as stalagmites could illuminate the link between hydroclimate, vegetation change, and fire activity in pre-anthropogenic climate states beyond the timescale of existing tree-ring records. Here we present an analysis of levoglucosan, a combustion-sensitive anhydrosugar, and lignin oxidation products (LOPs) in a stalagmite, reconstructing fire activity and vegetation composition in the California Coast Range across the 8.2 kyr event. Elevated levoglucosan concentrations suggest increased fire activity while altered LOP compositions indicate a shift toward more woody vegetation during the event. These changes are concurrent with increased hydroclimate volatility as shown by carbon and calcium isotope proxies. Together, these records suggest that climate whiplash (oscillations between extreme wetness and aridity) and fire activity in California, both projected to increase with anthropogenic climate change, were tightly coupled during the early Holocene.
Original languageEnglish
Article number7175
Pages (from-to)1-9
Number of pages9
JournalNature Communications
Volume13
Issue number1
Early online date23 Nov 2022
DOIs
Publication statusE-pub ahead of print - 23 Nov 2022

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