A dendrochronologist studies tree rings! I only know because my neighbor, who is a student at at the University of Arizona in Tucson, is doing independent study at the Laboratory of Tree-Ring Research there and invited us for a tour. Her work here follows a summer of collecting samples in New Mexico at a project her supervisor is doing for research for a master's degree.
The Tree Ring Lab is tucked under the U of A stadium, an unlikely place. It houses about two million tree rings and tree core samples in this and another location. Alicia met us in a nearby parking lot, then escorted us to the main area, where she got keys to unlock the storage area. There were boxes of samples and sections for large rings like the redwoods and sequoias pictured. We noted boxes of tree rings from all over th
e world.
We saw their equipment, used for gathering samples out in the field. Below see a bundle of cores taken from trees and Alicia holding one of the tools used to collect cores.Part of Alicia's job was to cut the tree into thin rings and then sand them down with fine sandpaper grit. Her supervisor liked Alicia to do the work because Alicia did such a good job; the tree rings look like they have been varnished after she has finished working on them.
Dendrochronologists can learn much about the climate and about fires as a result of studying tree rings. Specialists study tree rings to learn about climate, archaeology (dating trees used in the construction of cliff dwellings, for example), geomorphic processes like volcanic eruptions. See a list of sub-disciplines here.
Alicia worked in another building a block away where the lab also has a tiny plot of land in front. With a bequest
the lab has received, they have hired its first curator and plan to construct an addition. Maybe then they can offer tours of this fascinating place.
In the area where Alicia sanded tree rings to a glass-smooth surface, she showed us additional samples. This tree ring shows scarring from where a core was taken.
The most controversial tree ring in the lab had just been acquired. It was so large, it came in three boxes. It was a tree ring cut from Prometheus, a bristle cone pine that was more than 4800 years old, and possibly as much as 5000 years old, and believed to be the oldest tree in the world. It grew in what is now Great Basin National Park. The Forest Service issued a permit to Don
ald R. Currey to cut it down in 1964. Several stories circulate about the incident, but bottom line, they cut down a living tree. Wikepedia has photos and a more complete story. Scientists at the Tree Lab believe it to be even older. Fortunately, there are trees as old in California, but Currey's name will live on in infamy amongst dendrochronologists. (The part of Prometheus shown is only a tiny portion. Two six foot boxes held the other two pieces. Prometheus was huge!)
Most people have never heard of the study of tree rings and would
probably think dendrochronolgy was some sort of dental specialty, much
less be aware that the lab with the largest collection of tree rings is
hidden in the bowels of a stadium in Tucson. It was an absolutely fascinating
place to visit. We were very grateful to get a tour of the lab and for the small tree ring Alicia had cut, polished and given us as a gift. Beautiful!
RVers- don't bring your RV downtown to the University. Parking is about impossible for even students with permit. Park the RV at your RV park or a Wal-Mart and drive your tow or toad vehicle downtown. Even then you may end up walking a few blocks. The lab has no scheduled tours nor personnel to do it, but perhaps with a phone call, you could see part of the facility where the classroom is.
You can learn more about the research and programs that go on at the Tree-Ring Lab at their Web site. Occasionally they have talks open to the public. Check the events tab at their Web site if you are in Tucson. If nothing else, you have a new word in your vocabulary! Jaimie Hall Bruzenak