LTRR | Laboratory of Tree-Ring Research

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

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.

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Matt Salzer of the LTRR talks to Alex Ross of the New Yorker during the Schulman Grove fieldwork.

Bristlecone pines in The New Yorker magazine

Friday, January 24, 2020

LTRR researches feature prominently in an article on bristlecone pines (describing the background to the oldest trees, and first-hand accounts of the groves in the White Mountains of California).

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Kiyomi Morino working with images of cells within a tree ring

TV coverage of ring formation research

Sunday, July 21, 2019

A PBS TV broadcast highlights LTRR research on tree ring formation by Malcolm Hughes and Kiyomi Morino.

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Lei Wang and Jungang Dong of the Chinese Academy of Sciences in Xi’an, China, take a sample from an ancient southern Chinese pine tree on Mt. Helan in the western Loess Plateau of China.

Tree rings and the Asian Summer Monsoon

Thursday, May 30, 2019

Tree-ring study indicates an 80-year decline in Asian Summer Monsoon precipitation at its northern edge, which is consistent with increasing sulfur pollution according to climate modeling.

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