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Not all trees can be measured or used without additional analytical techniques: not all trees have cambiums that are created annually.
In tropical regions, for example, annual growth rings are not systematically formed, or growth rings are not tied to years, or there are no rings at all.
Because of that precision, dendrochronology is used to calibrate radiocarbon dating, by giving science a measure of the atmospheric conditions which are known to cause radiocarbon dates to vary.
Douglass was mostly interested in the history of climatic variations exhibited in tree rings; it was Wissler who suggested using the technique to identify when adobe pueblos of the American southwest were built, and their joint work culminated in research at the Ancestral Pueblo town of Showlow, near the modern town of Showlow, Arizona, in 1929. Judd is credited with convincing the National Geographic Society to establish the First Beam Expedition, in which log sections from occupied pueblos, mission churches and prehistoric ruins from the American southwest were collected and recorded alongside those from living ponderosa pine trees.
Evergreen cambiums are commonly irregular and not formed annually.
Trees in arctic, sub-arctic and alpine regions respond differently depending on how old the tree is--older trees have reduced water efficiency which results in a reduced response to temperature changes.
This core is split in the laboratory, the rings are counted and measured, and the sequence of rings is correlated with sequences from other cores.
the amount of growth) for each year is determined by various internal and external factors, but it tends to vary mainly in proportion to either the amount of available precipitation or the prevailing temperatures.