We are a research group at the Laboratory of Tree-Ring Research at the University of Arizona.  We use tree rings to study past climate, forest ecosystems, and their interactions.  Our research interests include the climate of the last ~2,000 years, atmospheric circulation patterns, fire-climate interactions, the carbon cycle, seasonally dry forests, and human-environment interactions.   We have a global focus and are involved in research projects in the American West, Africa, and central and southeastern Europe.

Adonis: Oldest known living tree in Europe

While doing fieldwork in the Pindos Mountains in Greece, Soumaya, Matt, and Valerie were involved in the sampling of Adonis, Europe's oldest known living tree: a 1075-year old Bosnian pine (Pinus heldreichii).  The field expeditions were led by Paul Krusic from Stockholm University and were in collaboration with Jan Esper's group at the University of Mainz.