Tree-Ring Laboratory at the University of Arizona
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| Tree-Ring Laboratory at the University of Arizona | |
|---|---|
| Name | Tree-Ring Laboratory at the University of Arizona |
| Established | 1960s |
| Type | Dendrochronology research center |
| Location | Tucson, Arizona |
| Affiliation | University of Arizona |
Tree-Ring Laboratory at the University of Arizona is a dendrochronology research center within the University of Arizona known for long-term chronologies, paleoclimate reconstructions, and archaeological dating. The laboratory integrates field collection, laboratory analysis, and computational synthesis to produce crossdated chronologies used across paleoclimatology, archaeology, ecology, and forensics. Its work supports international initiatives in climate reconstruction, water-resource assessment, and cultural heritage dating.
History
The laboratory traces origins to postwar growth in dendrochronology influenced by figures associated with University of Arizona expansion, regional projects tied to National Science Foundation funding, and collaborations with entities like Smithsonian Institution and National Park Service. Early growth paralleled developments at institutions such as University of Colorado Boulder, University of Arizona School of Forestry, and the Laboratory of Tree-Ring Research legacy, linking to continental efforts exemplified by projects at University of Arizona colleagues and cross-disciplinary teams from U.S. Geological Survey and National Oceanic and Atmospheric Administration. Over decades, the facility expanded through partnerships with NASA, U.S. Forest Service, Arizona State Museum, and international nodes in Spain, Chile, and New Zealand, reflecting an era of networked paleoclimate reconstruction exemplified by initiatives tied to the Intergovernmental Panel on Climate Change datasets and regional assessments like those from Western Regional Climate Center.
Facilities and Collections
The laboratory houses climate-sensitive collections including millennia-spanning chronologies from Southwestern United States, Great Basin, Sierra Nevada, and Mexican Plateau sources, plus archaeological timbers from sites curated by Arizona State Museum, Museum of Northern Arizona, and partner repositories. Instrumentation ranges from high-resolution imaging adapted from equipment used at Jet Propulsion Laboratory collaborations to X-ray densitometry systems comparable to installations at the Chronology and Dendrochronology Research Center and precision increment borers frequently employed by teams from U.S. Forest Service. Digital archives interoperate with data standards promoted by International Tree-Ring Data Bank and metadata schemas like those used by National Center for Atmospheric Research and NOAA Paleoclimatology archives.
Research and Projects
Research programs span reconstruction of hydroclimate records used in studies with Arizona Department of Water Resources, multidecadal drought analyses contributing to assessments by Bureau of Reclamation and U.S. Army Corps of Engineers, and archaeological dating linked to excavations by Crow Canyon Archaeological Center and fieldwork associated with Ancestral Puebloans sites. Projects have informed policy dialogues involving Western Governors' Association and contributed to paleoclimate syntheses cited alongside work from Lamont–Doherty Earth Observatory, Scripps Institution of Oceanography, and Potsdam Institute for Climate Impact Research. International collaborations include reconstructions coordinated with Instituto Nacional de Investigación y Tecnología Agraria y Alimentaria researchers, transcontinental syntheses involving University of Cambridge teams, and methodological exchanges with Swiss Federal Institute for Forest, Snow and Landscape Research.
Methods and Techniques
Analytical techniques incorporate crossdating protocols consistent with standards from the International Union of Geodesy and Geophysics community, ring-width measurement using sliding-stage micrometers parallel to those used by University of Oslo researchers, and densitometry following approaches developed in cooperation with Woods Hole Oceanographic Institution and European Space Agency projects. Statistical approaches employ signal processing and calibration methods used in studies at Paleoclimatology Center and leverage chronology-building software comparable to tools from NOAA and PAGES initiatives. Laboratory procedures for sample preparation, stable isotope analysis, and radiocarbon wiggle-matching align with practices in laboratories collaborating with Oxford Radiocarbon Accelerator Unit and University of Groningen.
Education and Outreach
The laboratory provides training for graduate students enrolled in programs at University of Arizona Graduate College, offers workshops co-sponsored by organizations such as Society for American Archaeology and Tree-Ring Society affiliates, and hosts field schools patterned on models from Harvard University and University of California, Berkeley. Outreach includes public lectures delivered in partnership with venues like Arizona-Sonora Desert Museum, curriculum modules for K–12 teachers coordinated with Arizona Department of Education, and digital resources shared with platforms used by Smithsonian Institution educators and National Geographic collaborators.
Notable Personnel and Collaborations
Faculty, researchers, and alumni have collaborated with luminaries and institutions across disciplines, including cooperative work with groups at Lamont–Doherty Earth Observatory, Scripps Institution of Oceanography, National Center for Atmospheric Research, NOAA Paleoclimatology Program, Bureau of Reclamation, U.S. Forest Service, Smithsonian Institution, Arizona State Museum, and international partners at University of Cambridge and Swiss Federal Institute for Forest, Snow and Landscape Research. These collaborations underpin contributions to high-profile syntheses alongside authors affiliated with Intergovernmental Panel on Climate Change, National Academies of Sciences, Engineering, and Medicine, and editorial roles in journals such as Quaternary Research, Journal of Geophysical Research, and Dendrochronologia.