THOMAS W. SWETNAM REGENTS PROFESSOR OF DENDROCHRONOLOGY, EMERITUS
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Tree Rings,
​Forest Ecology, Fire
& Human History

Welcome

I study natural and cultural disturbances of forest ecosystems across a broad range of temporal and spatial scales. My primary tool is dendrochronology -- the use of tree rings to reconstruct and evaluate variations in past and present environments.  I use tree-ring records in combination with other natural archives and documentary sources to reconstruct the histories of fire, insect outbreaks, human land uses, and climate.  With collaborators I am currently studying disturbance and climate histories in western North America and the Central Plateau of Siberia, Russia.

Picture
Picture
My new book published by UNM Press in 2025

Laboratory of
​Tree-Ring Research
​University of Arizona

&
Jemez Mountains
Tree-Ring Lab
Picture

Email:
​tswetnam AT LTRR.arizona.edu


Blusky:
@firescar.bsky.social

Bryant Bannister Tree-Ring Bldg.
1215 E. Lowell Street
Tucson, Arizona 85721-0058


​Last updated 01/21/25

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  • Home
  • Past & Current Projects
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