Laboratory of Tree-Ring Research
The Laboratory of Tree-Ring Research (LTRR) is the world's largest archive for dendrochronology . It is affiliated with the University of Arizona .
history
The LTRR comes from a collection of wood samples from the astronomer Andrew Ellicott Douglass , who tried in vain to discover a connection between sunspot cycles and tree growth. In 1937 he founded the archive. Until 2013 it was housed in a makeshift building on the west side of the Arizona Stadium , then the "Bryant Bannister tree ring laboratory", named after a former director , was also built in Tucson .
The current directors are David C. Frank and Steve Leavitt.
Duration
With the help of the annual rings of trees, research is carried out worldwide into climate fluctuations and the age of archaeological finds is determined. The archive currently contains around 750,000 wood samples, including one from a 5000-year-old pine .
Individual evidence
- ↑ Bild der Wissenschaft 11/2019, p. 40, Desiree Karge: Die silent Chronografen