We developed two chronologies for each of the species studied.The first of these chronologies was based on all visually crossdated radii and the other on radii for which crossdating had been independently verified.Dendrochronology is useful for determining the timing of events and rates of change in the environment (most prominently climate) and also in works of art and architecture, such as old panel paintings on wood, buildings, etc.It is also used in radiocarbon dating to calibrate radiocarbon ages.
Dendrochronology (or tree-ring dating) is the scientific method of dating tree rings (also called growth rings) to the exact year they were formed in order to analyze atmospheric conditions during different periods in history.
Signal strength was higher in the verified chronologies.
Correlation analysis between the verified chronologies and climate data revealed no significant correlation between precipitation and ring width for either species.
Each ring marks a complete cycle of seasons, or one year, in the tree's life.
In his Trattato della Pittura (Treatise on Painting), Leonardo da Vinci was the first person to mention that trees form rings annually and that their thickness is determined by the conditions under which they grew. S., Alexander Catlin Twining (1801–1884) suggested in 1833 that patterns among tree rings could be used to synchronize the dendrochronologies of various trees and thereby to reconstruct past climates across entire regions.
During the first half of the 20th century, the astronomer A. Douglass founded the Laboratory of Tree-Ring Research at the University of Arizona.