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As part of the University's COVID-19 response, the Tree-Ring Lab buildings are closed until further notice.
We continue to monitor phone and email messages, course and outreach activities continue online,
but we are not accepting visitors or deliveries.

  • Established by the pioneer of dendrochronology.

    A.E. Douglass, originator of the science of tree-ring dating, founded the Laboratory of Tree-Ring Research in 1937.
    https://ltrr.arizona.edu/about/history

  • Housed in a custom facility.

    A building constructed in 2013 provides lab and office space, augmented by a building recently renovated as a wood sample archive.
    https://ltrr.arizona.edu/building

  • Pursuing interdisciplinary research.

    Dendrochronology helps reconstruct environmental change, and unravel processes in ecosystems and human societies; researchers in many parts of the world collaborate with the Laboratory of Tree-Ring Research.
    https://ltrr.arizona.edu/research

  • Educating students and the public.

    The Laboratory of Tree-Ring Research teaches undergraduate and graduate courses; its outreach program also reaches thousands of children and adults in the community.
    https://ltrr.arizona.edu/courses

  • Established by the pioneer of dendrochronology.

  • Housed in a custom facility.

  • Pursuing interdisciplinary research.

  • Educating students and the public.

News

The base of a giant sequoia trunk in the snow.

Giant sequoia tree rings reveal snow history

Thursday, January 28, 2021

LTRR researchers have published a paper reconstructing the history of snow accumulation in California over thousands of years from giant sequoia tree rings.

Read more
Accelerator Mass Spectrometry radiocarbon dating lab

New and improved radiocarbon calibration curves

Wednesday, August 12, 2020

The new and improved IntCal20 radiocarbon calibration curves have just been released and are now available for use by anyone using the radiocarbon dating method.

Read more
a) Growth changes: 2011–2040 versus 1902–2010. b) Model uncertainties: low to high.

Predicting how trees will grow in a radically changed world

Tuesday, June 30, 2020

If a warmer world subjects trees to conditions different from any they've experienced in the past it's difficult to predict how they will grow, but a new paper investigates ways to do this.

Read more
Tree Story by Valerie Trouet (hardback book)

Tree Story: dendrochronology for everyone

Monday, April 20, 2020

LTRR professor Valerie Trouet has written a popular book on the uses of tree-ring science Tree Story: The History of the World Written in Rings.

Read more
Overlapping stills from the videos.

Videos from the Evans research group

Thursday, April 9, 2020

Margaret Evans and her research group have recorded videos explaining the scientific background and their current work on forest ecosystems, climate change, and carbon cycling to a broad audience.

Read more
Gordion: the wooden casing within the Midas Mound tumulus

True calendar dates for ancient Eastern Mediterranean civilizations.

Wednesday, April 1, 2020

Charlotte Pearson and other LTRR researchers fix the chronologies for dating ancient Eastern Mediterranean civilizations, including a possible date for the Thera eruption, in a Proceedings of the National Academy of Sciences article.

Read more
  • Read All News

Wednesday, March 3

  • 12:00 PM to 1:00 PM
    Is understanding the past enough to predict the future? Global tree-ring data show complex impacts of climate change.

See Calendar →

College of Science

Bryant Bannister Tree-Ring Building, 1215 E. Lowell Street, Tucson, AZ 85721-0045, USA office@ltrr.arizona.edu 520-621-1608

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